Andrés David Turizo-Smith1,2
Samantha Córdoba-Hernandez2
Lidy Vannessa Mejía-Guarnizo3,4
Paula Stefany Monroy-Camacho4
Josefa Antonia Rodríguez-García4*- 1Doctorado en Oncología, Departamento de Patología, Facultad de Medicina, Universidad Nacional de Colombia, Bogotá, Colombia
- 2Semillero de Investigación en Cannabis y Derivados (SICAD), Universidad Nacional de Colombia, Bogotá, Colombia
- 3Facultad de Ciencias, Maestría en Ciencias, Microbiología, Universidad Nacional de Colombia, Bogotá, Colombia
- 4Grupo de investigación en Biología del Cáncer, Instituto Nacional de Cancerología, Bogotá, Colombia
Chronic inflammation plays a crucial role in the onset and progression of pathologies like neurodegenerative and cardiovascular diseases, diabetes, and cancer, since tumor development and chronic inflammation are linked, sharing common signaling pathways. At least 20% of breast and colorectal cancers are associated with chronic inflammation triggered by infections, irritants, or autoimmune diseases. Obesity, chronic inflammation, and cancer interconnection underscore the importance of population-based interventions in maintaining healthy body weight, to disrupt this axis. Given that the dietary inflammatory index is correlated with an increased risk of cancer, adopting an anti-inflammatory diet supplemented with nutraceuticals may be useful for cancer prevention. Natural products and their derivatives offer promising antitumor activity with favorable adverse effect profiles; however, the development of natural bioactive drugs is challenging due to their variability and complexity, requiring rigorous research processes. It has been shown that combining anti-inflammatory products, such as non-steroidal anti-inflammatory drugs (NSAIDs), corticosteroids, and statins, with plant-derived products demonstrate clinical utility as accessible adjuvants to traditional therapeutic approaches, with known safety profiles. Pharmacological approaches targeting multiple proteins involved in inflammation and cancer pathogenesis emerge as a particularly promising option. Given the systemic and multifactorial nature of inflammation, comprehensive strategies are essential for long term success in cancer therapy. To gain insights into carcinogenic phenomena and discover diagnostic or clinically relevant biomarkers, is pivotal to understand genetic variability, environmental exposure, dietary habits, and TME composition, to establish therapeutic approaches based on molecular and genetic analysis. Furthermore, the use of endocannabinoid, cannabinoid, and prostamide-type compounds as potential therapeutic targets or biomarkers requires further investigation. This review aims to elucidate the role of specific etiological agents and mediators contributing to persistent inflammatory reactions in tumor development. It explores potential therapeutic strategies for cancer treatment, emphasizing the urgent need for cost-effective approaches to address cancer-associated inflammation.
1 Introduction
Inflammation, particularly chronic inflammation, plays a pivotal role in the onset and progression of various chronic pathologies including neurodegenerative and cardiovascular diseases (Stephenson et al., 2018; Becatti et al., 2018), diabetes (Turkmen, 2017), and cancer (Murata, 2018). Breast and colorectal cancer (CRC) are the most prevalent types of cancer worldwide (Harbeck and Gnant, 2017), with a significant incidence and mortality rates (Sung et al., 2021). At least 20% of cancers are linked to chronic inflammatory processes triggered by factors such as infections, exposure to irritants, or autoimmune diseases (Table 1) (Crusz and Balkwill, 2015).
Table 1. Summary of risk factors and inflammatory conditions associated with cancer development and estimated new cases around the world. Globocan, 2020.
After successfully resolving the acute phase, the tissue remodeling process begins, aiming to reinstate physiological conditions. Inflammation, a physiological response, acts as a defense mechanism against pathogens and facilitates tissue repair once the triggering agent has been eliminated. Inflammatory response is dynamic and can manifest as an acute, self-limited process that effectively restores tissue homeostasis, by generating cellular determinants and locally active inflammatory mediator molecules (Gupta et al., 2018a).
Following the effective resolution of the acute phase, a subsequent stage of tissue remodeling is initiated to systematically restore the physiological condition of the affected area. However, the course of inflammation can deviate towards a chronic course when this regulatory mechanism is disrupted, impeding the resolution process. In such instances, the persistent production of proinflammatory molecules and the ongoing recruitment of inflammatory cells contribute to a chronic state, this prolonged inflammation hampers the re-establishment of tissue homeostasis, underscoring the complexity and potential consequences of dysregulated inflammatory responses (Sugimoto et al., 2016).
Tumor development is associated with a chronic inflammatory process, as inflammation and cancer both engage common signaling pathways (Barabutis et al., 2018). This review aims to elucidate specific etiological agents and mediators that can initiate persistent inflammatory reactions contributing to the development of tumors. Additionally, the exploration will encompass viable therapeutic strategies designed for cancer treatment, improving our understanding of the interplay between inflammation and tumorigenesis.
Presently, cancer treatments are prolonged and often involve several adverse effects. Moreover, their exorbitant costs render them inaccessible to more than 80% of the global population (Gupta et al., 2018a), Consequently, there is an imperative need to explore novel cost-effective therapeutic approaches for addressing the inflammatory phenomena associated with cancer.
2 Inflammation and cancer: a complex problem with no simple answers
It is now well-established that the presence of inflammatory cells precedes tumor development (Colotta et al., 2009; Thompson et al., 2015). Given that all tumors exhibit an inflammatory infiltration, chronic inflammation is widely recognized as a hallmark of cancer (Grivennikov et al., 2010; Hanahan and Weinberg, 2011; Capece et al., 2018; Paul, 2020). Carcinogenesis linked to factors such as tobacco use, pathogenic infections, and exposure to irritants like asbestos (Colotta et al., 2009; Thompson et al., 2015) explains the impact of inflammatory processes on tumor development. Inflammation promotes the acquisition of tumor cell characteristics such as apoptosis suppression, uncontrolled growth, tumor dissemination, and immune evasion (Colotta et al., 2009; Thompson et al., 2015). The inclusion of Inflammation as a distinctive feature of cancer stems from the pivotal role played by inflammatory cells in tumor development (Hanahan and Weinberg, 2011).
Through the action of proinflammatory agents such as histamine, growth factors, cytokines, and free radicals, among others, vascular permeability increases, creating a favorable environment for cancer development (Nagy et al., 2008). Cigarette smoking has been linked to a significant reduction in the activity of superoxide dismutase and glutathione peroxidase enzymes in erythrocytes, decreasing antioxidant defense mechanisms and increasing the cellular vulnerability to oxidative stress and damage associated with reactive oxygen species, potentially leading to carcinogenesis (Caliri et al., 2021).
The status of the human microbiome emerges as a risk factor influencing the development and outcome of various cancers (Aarnoutse et al., 2019; Lucas et al., 2017). It is well known that the human gastrointestinal system hosts approximately 1,000 species of microorganisms, which maintain symbiotic relationships with the host (Qin et al., 2010; Lucas et al., 2017), performing metabolic, immunological, and protective functions. An imbalance in its composition (dysbiosis) has been linked to chronic inflammatory diseases (Lucas et al., 2017). Numerous studies reveal alterations in the microbiome composition of patients with colon adenomas, suggesting a role for dysbiosis in the initial stages of CRC development (Shen et al., 2010; McCoy et al., 2013) and intestinal barrier dysfunction (Yu and Fang, 2015; Vipperla and Keefe, 2016).
Adopting healthy lifestyle including sound dietary consumption is fundamental for inflammation prevention, especially when coupled with factors such as obesity (Kolb et al., 2016) and cardiovascular disease (Becatti et al., 2018), which are closely associated with chronic diseases and cancer development (Escobar et al., 2020; Guha et al., 2021), It has been demonstrated that direct consumption of probiotics and/or prebiotics, like lactic acid bacteria, can modulate the development of certain types of cancer. Probiotics, defined as live microorganisms, conferring health benefits when administered in adequate amounts (Hill et al., 2014; Lucas et al., 2017; Cheng et al., 2020), have been reported to influence colorectal adenocarcinoma cell lines such as HT-29, leading to over-regulation of BAX and IL-10 expression and downregulation of Bcl-2 expression, inducing apoptosis, and inhibiting cell growth (Chen et al., 2017; Del Carmen et al., 2017). Furthermore, the microbiome’s composition influences responses to chemotherapy and immunotherapy (Iida et al., 2013; West and Powrie, 2015). In murine melanoma models, Bifidobacterium significantly improves the response to anti-PDL1 immunotherapy (Sivan et al., 2015), and Bacteroides enhances the effectiveness of anti-CTLA-4 therapy by stimulating the immune response (Vétizou et al., 2015).
Notably, inflammation observed in cancer patients demonstrates dysregulation and increased production of inflammatory agents like proteases, eicosanoids, cytokines, chemokines, and acute-phase inflammatory proteins that enter the circulation. Evidence suggests that immune cells produced many proteins, in broad quantities, regulating immune cells function under inflammatory conditions. Protein altered serum levels were observed in CRC patients compared to controls.
(Table 2) (Hanahan and Coussens, 2012; Candido and Hagemann, 2013; Tuomisto et al., 2019a). Evaluating the serum profiles of 13 cytokines, chemokines, and growth factors in 116 CRC patients and 86 healthy controls revealed an increased expression of IL-6, IL-7, CXCL8, IL-8, and PDGFB and decreased serum CCL2 levels (Kantola et al., 2012; Jin et al., 2014; Xu et al., 2016).
Table 2. Systemic inflammatory markers showing altered circulating levels in patients with CRC.
Here, a concise overview is provided of some inflammatory cytokines and modulators that could serve as potential targets for anticancer therapy, along with their potential involvement in inflammation-associated carcinogenesis.
2.1 Interleukin-6 (IL-6)
IL-6, a pleiotropic cytokine, is produced by various immune cells (monocytes, macrophages, T and B lymphocytes), epithelial, fibroblast, glia, adipocytes, and tumor cells within the tumor microenvironment (TME) (Taniguchi and Karin, 2014a; Crusz and Balkwill, 2015). Notably, Ras-induced IL-6 secretion within the TME actively promotes tumor growth in vivo (Ancrile et al., 2007). IL-6 exhibits both pro- and anti-inflammatory actions contributing significantly to tumor development. Adipose tissue is a major source of IL-6, accounting for approximately 30% of circulating IL-6. This association explains the heightened cancer risk and poor prognosis associated with obesity (Kolb et al., 2016; Tuomisto et al., 2019a). Given that the clinical management practices for cancer patients are similar regardless of weight, understanding the mechanisms through which obesity influences cancer initiation and progression becomes crucial for developing precise therapies tailored to obese cancer patients.
In experimental models of carcinogenesis, IL-6 activity, mediated by signal transducer and activator of transcription 3 STAT3, increases cell survival, and promotes invasion and metastasis (Taniguchi and Karin, 2014a; Hirano, 2021a). It has been observed that an intriguing inverse relationship between IL-6 levels and response to treatments such as chemotherapy and hormone therapy. This correlation appears to align with a worse prognosis in various cancer types, including ovarian (Kulbe et al., 2007; Nolen et al., 2008; Anglesio et al., 2011; Kumari et al., 2016), hepatocellular (Naugler et al., 2007), and colorectal (Lippitz and Harris, 2016) cancers, among others. These insights underscore the significance of unraveling IL-6-mediated mechanisms in cancer progression and refining therapeutic strategies for improved patient outcomes.
2.2 Tumor necrosis factor α (TNFα)
TNFα exerts pleiotropic actions in the regulation of the inflammatory immune response. The interaction of TNFα with both TNFR1 and TNFR2 receptors governs the modulation of cytokines, proteases, and growth factors (Crusz and Balkwill, 2015). In chemically induced models of colitis and CRC, TNFα produced by mononuclear cells appears to play a pivotal role in inflammation and subsequent tumor development (Popivanova et al., 2008). Therapeutic interventions involving anti-TNFα antibodies or TNF receptor fusion molecules have demonstrated efficacy in genetic models of liver cancer and CRC, although the precise mechanism of action of these therapies remains to be elucidated (Pikarsky et al., 2004; Rao et al., 2006).
2.3 NF-kB
NF-kB, a key regulator of inflammatory events, is associated with tumor development and progression (Capece et al., 2018). This transcription factor orchestrates inflammatory immune responses and governs various aspects of tumor development, including inhibition of apoptosis, stimulation of cell proliferation, and promotion of cell migration and invasion (Ben-Neriah and Karin, 2011; DiDonato et al., 2012). In CRC, NF-kB hampers the efficacy of chemotherapeutic agents such as 5-fluorouracil, oxaliplatin, and paclitaxel by upregulating the expression of anti-apoptotic proteins, like Bcl-2 and Bcl-xL (Soleimani et al., 2020), Furthermore, NF-kB promotes the expression of proinflammatory cytokines, including TNFα, IL-6, and IL-1β, elevates levels of angiogenic factors such as HIF-1α, IL-8, and vascular endothelial growth factors (VEGF), and facilitates the expression of chemokines, cytoskeleton genes, and matrix metalloprotease (MMP) (Patel et al., 2018; Martin et al., 2021) all contributing to a microenvironment favorable for metastasis.
2.4 Signal transducer and activator of transcription 3 (STAT3)
STAT3 emerges as a pivotal transcription factor involved in cancer progression, with its persistent activation fostering chronic inflammation that increases cellular susceptibility to carcinogenesis. STAT3 promotes signaling through pro-oncogenic inflammatory pathways, such as NF-kB and gp130/Jak/STAT, leading to increased tumor cell proliferation, survival, and invasion while simultaneously suppressing antitumor immunity (Yu et al., 2009; Loh et al., 2019). STAT3 plays a crucial role in the carcinogenesis and tumor progression of various solid tumors, including head and neck squamous cell carcinoma (Loh et al., 2019) and CRC (Gargalionis et al., 2021), as well as leukemias and lymphomas (Loh et al., 2019).
2.5 Cyclooxygenases (COX)
COX are enzymes with tumor-promoting activity. They achieve this by converting free arachidonic acid (AA) into prostanoids, including prostaglandins (PGs) (Wang and Dubois, 2010), which act on tumor cells by inhibiting apoptosis, increasing cell migration, and promoting angiogenesis (Crusz and Balkwill, 2015; Chatterjee et al., 2018). The continued overexpression of COX-2 plays a significant role in promoting carcinogenesis. It does so by increasing the expression of carcinogenic reactive oxygen species (ROS) and the production of prostaglandin E2 (PGE2). COX-2 further stimulates VEGF through PGE2 promoting angiogenesis and increasing the production of metalloproteinases to favor invasion and metastasis. Additionally, it decreases bioavailable arachidonic acid stores, reducing cell differentiation and apoptosis. Notably, COX-2 inhibits the proliferation of B and T lymphocytes, as well as NK cells, thereby limiting the antineoplastic activity of the immune system (Desai et al., 2018). COX-2 overexpression has been observed in various cancers, including breast, colon, prostate, pancreatic, head and neck, skin, and lung (Crusz and Balkwill, 2015; Chatterjee et al., 2018; Desai et al., 2018).
Experimental evidence suggests that COX can metabolize endocannabinoids, such as 2- Arachidonoylglycerol (2-AG) and Anandamide (AEA), into prostaglandin glycerol esters (PG-Gs) and prostaglandin ethanol amides (PG-EAs), respectively (Kozak et al., 2002). COX-2-derived metabolites, collectively known as prostamide, represent a novel class of biologically active eicosanoids. Prostamide modulates cellular functions including the modulation of IL-2 expression in T cells (Rockwell et al., 2008), the inhibition of cell growth, and the induction of apoptosis in CRC cell lines HT29 and HCA7/C29 (Patsos et al., 2005).
In contrast to prostaglandins, which are a well-established potent bioactive lipid messengers derived from arachidonic acid, with extensively studied physiological functions and receptor signaling pathways, the roles of prostamides remain not yet fully understood. Evidence suggests that uridine diphosphate (UDP) P2Y6 serves as the specific receptor for PGE2-G (Brüser et al., 2017). P2Y6 receptor, which under normal physiological conditions is expressed in various cell types and tissues, including the spleen, thymus, intestine, aorta, and leukocytes, plays a crucial role in maintaining immune functions. It has been shown that P2Y6 potentiates proinflammatory responses in macrophages and exhibits differential roles for the development of atherosclerotic lesions, as P2Y6 deficiency can reduce macrophage-mediated cholesterol uptake (Garcia et al., 2014).
Furthermore, the P2Y6 receptor serves as a significant endogenous inhibitor of T-cell function in allergic pulmonary inflammation (Giannattasio et al., 2011). P2Y6 is implicated in increasing IL-1β production and hyperalgesia, in inflammation and macrophage activation (Brüser et al., 2017). While classical PGE2 can reduce the production of proinflammatory cytokines after lipopolysaccharide (LPS) stimulation, limited information exists regarding the ability of prostamide, prostaglandin E2 ethanolamine (PGE2-EA), to modulate immune responses. However, it has been indicated that PGE2-EA, at low concentrations, is pharmacologically active in various smooth muscle tissues and can bind to all four PGE receptor subtypes (EP1-EP4), suggesting similar actions to PGE2. Additionally, studies have shown that PGE2-EA can suppress the inflammatory action of human monocytes by inhibiting LPS- stimulated TNF-α production (Brown et al., 2013).
While numerous studies demonstrate the production of PGE2 at inflammatory sites, immunoassays quantifying PG have indicated non-specific binding to structurally similar compounds such as PGE2-EA (Glass et al., 2005). Chromatographic methods are recommended for accurate analyses, as prostamides were initially misidentified as prostanoids (Woodward et al., 2008; Brown et al., 2013; Gouveia-Figueira and Nording, 2015). Notably, prostamides exhibit a longer half-life compared to prostaglandins. Even though the latter have substantial biological effects. Prostamide and glycerol esters as endocannabinoid-derived COX-2 metabolites may be stable enough to exert systemic activity (Weber et al., 2004).
Building up the information provided above, prostamide-type compounds emerge as potential biomarkers and therapeutic targets for addressing inflammation and influencing adipocyte differentiation in a coordinated effort to regulate carcinogenic processes. Notably, there is a perspective among some authors suggesting that the potential therapeutic advantage of COX-2 inhibitors may, at least in part, stem from their ability to diminish or modulate prostamide levels (Woodward et al., 2008). This insight underlines the potential significance of targeting prostamide pathways in the development of therapeutic interventions for conditions involving inflammation and adipocyte differentiation, contributing to the overall orchestration of carcinogenic phenomena.
3 Immune cells associated with tumor microenvironment
Immune cells play a pivotal role in maintaining tissue homeostasis and eliminating pathogens or damaged cells. However, in the TME, the dynamics of immune recognition and cytotoxicity are altered, favoring cell survival, and facilitating tumor development (Figure 1) (Khandia and Munjal, 2020).
Figure 1. Visual representation of the functions of tumor-associated macrophages (TAMs) and tumor-associated neutrophils (TANs) in cancer-related inflammation underscores their pivotal roles as key regulators of tumor-related inflammatory processes. Neoplastic and stromal cells recruit macrophages and neutrophils to the tumor microenvironment (TME), directing their polarization towards different phenotypes. Macrophages can polarize into an M1-like phenotype with antitumor functions under immunostimulatory cytokines such as IFN-γ and TNF-α, releasing TNF-alpha, ROS, and NO to induce apoptosis and cytotoxicity in cancer cells. Conversely, M2-like macrophages, conditioned by the hypoxic tumor microenvironment and immunosuppressive mediators (IL-10, TGFβ), exhibit pro-tumor functions. M2-like TAMs secrete molecules promoting angiogenesis (CXCL8, VEGF), tumor proliferation (EGF, TGF-β, PDGF), induce epithelial-mesenchymal-transition (EMT) (TGFβ), and continuous matrix remodeling (MMPs, proteases). They also produce various immunosuppressive molecules (IL-10, TGFβ, IDO1/2), which support regulatory T cells. Neutrophils, under TGF-β induction, can polarize into N1 phenotype, whereas under the influence of type I IFNs, they polarize into N2 phenotype. Subsequently, N1 neutrophils could inhibit the development of cancer through tumor cell cytotoxicity, tumor suppression (type 1 IFN), and antiangiogenic effects over the tumor (IFN-β). On the other hand, N2 neutrophils could promote the development of cancer by fostering carcinogenesis and cancer metastasis [MMPs, oncostatin M (OSM), hepatocyte growth factor (HGF)], tumor growth (NE), and cancer angiogenesis [VEGFs, MMP-1, prokineticin 2 (BV8)], as well as suppressing immunity (arginine depletion).
Tumor-associated macrophages (TAMs), which represent up to 50% of the tumor mass within the TME, play a significant role in promoting cell proliferation, suppressing the antitumor immune response, and enhancing immune evasion and metastasis. Recruitment of TAMs to the TME from the bloodstream is orchestrated by the action of cytokines, chemokines, and growth factors produced by tumor and stromal cells (Todoric et al., 2016). Typically, macrophages recruited to the TME undergo reprograming from an antitumor M1 phenotype to a pro tumor M2 phenotype, which promotes tumor development (Todoric et al., 2016; Khandia and Munjal, 2020). In various cancer types, the infiltration of M2 macrophages has been linked to a poor prognosis due to their tumor growth-promoting functions. This association has stimulated the exploration of novel therapeutic alternatives aimed at reducing the infiltration of these cells in the microenvironment of different tumors both in vivo and in vitro.
Similar to macrophages, neutrophils also play crucial roles in modulating tumor behavior, as evidenced by experimental models and epidemiological studies. Tumor-Associated Neutrophils (TANs) are key components in Cancer-Related Inflammation, exhibiting versatile functions that can either impede or promote tumor progression. In murine cancer models, neutrophils have been shown to respond to TGF-β by acquiring a protumoral phenotype. However, inhibition of TGF-β leads to enhanced neutrophil infiltration into tumors, resulting in heightened cytotoxicity against tumor cells and elevated expression of pro-inflammatory molecules. Additionally, neutrophils possess a spectrum of activation states, including an antitumor N1 phenotype and a protumor N2 phenotype, in response to signals from the Tumor Microenvironment (TME). These findings underscore the complexity of immune cell interactions within the TME and highlight the potential of targeting neutrophils as a therapeutic strategy in cancer treatment (Galdiero et al., 2018).
Numerous research studies have accelerated the development of potential therapies, including the use of antibodies like anti-colony-stimulating factor receptor 1 (CSF-1R), which has shown clinical benefits for patients with diffuse multinucleated giant cell tumors (Mantovani and Allavena, 2015). Moreover, considering that TAMs express substantial amounts of COX-2, experiments in animal models of colon cancer, have demonstrated that the use of COX-2 inhibitors such as celecoxib, results in a phenotypic shift from M2 to M1, resulting in polyp reduction (Nakanishi et al., 2011), highlighting promising avenues for therapeutic interventions targeting immune cells within the tumor microenvironment.
Figures 2, 3 illustrate the interactions between some inflammatory regulatory agents and their role in carcinogenesis.
Figure 2. STAT3 (e.g., IL-6) and NF-κB (e.g., IL-17 or TNFα) activators play a crucial role in enhancing the production of proinflammatory mediators, including IL-6, from non-immune cells such as fibroblasts and adipocytes. This process gives rise to an amplification mechanism known as the IL-6 amplifier (IL-6 Amp). Through the production of chemokines, IL-6 Amp facilitates the recruitment of immune system cells such as activated T-cells to the site of inflammation. The dynamic interaction between immune and non-immune cells further reinforces the IL-6 Amp, leading to an increased expression of genes involved in diverse cellular processes, including cell proliferation, survival, and migration, inflammation, and angiogenesis, among others. This intricate interplay underscores the significance of STAT3 and NF-κB activation in orchestrating a cascade of events that contribute to the sustained and heightened inflammatory response within the affected tissue implicated in cancer and chronic inflammatory diseases. Adapted from (Hirano, 2021b).
Figure 3. The induction of the COX-2 model involves various key processes driven by proinflammatory cytokines, resulting in stimulated cell proliferation and increased metastatic potential, while also influencing apoptosis and inflammation. Several molecular components participate in this intricate network: Akt protein kinase B (AKT-PKB), involved in signaling pathways related to cell survival and growth; activator protein-1 (AP-1), pivotal in cellular processes such as proliferation, differentiation, and apoptosis; cyclooxygenase-2 (COX-2), playing a role in inflammation and promoting cell proliferation; extracellular signal-regulated kinases 1/2 (ERK1/2), contributing to cell proliferation and differentiation; inhibitor of κB (IκB), regulating inflammatory responses; interleukins (IL), involved in immune responses and inflammation; lipopolysaccharide (LPS), a component of Gram-negative bacterial cell walls inducing inflammation; mitogen-activated protein kinase 1/2 (MEK1/2), playing a role in cell proliferation; mitogen-activated protein kinase 3 (MKK3), contributing to cellular responses; nuclear factor-κB (NF-κB), central to the regulation of immune and inflammatory responses; P38 mitogen-activated protein kinase (P38 MAPK), involved in cellular responses to stress and inflammation; p53 oncogene (p53), regulating cell cycle progression and apoptosis; prostaglandin E2 (PGE2) with various physiological effects, including inflammation; peroxisome proliferator-activated receptor γ (PPARG), involved in regulating genes associated with adipocyte differentiation and inflammation; mitogen-activated protein kinase cascade (Ras/Raf), involved in cell growth and differentiation; tumor necrosis factor-α (TNF-α), involved in inflammation and immune system regulation; Phosphoinositide 3-kinase, Protein kinase B, and Mammalian target of rapamycin (PI3K/AKT/mTOR), regulate cell growth and survival; Hypoxia-inducible factor 1α (HIF-1α), controls the cellular response to low oxygen levels; Vascular endothelial growth factor (VEGF), promotes the formation of new blood vessels; Platelet-derived growth factor (PDGF), stimulates cell growth and angiogenesis; Dendritic cells (DC), serve as antigen-presenting cells; T lymphocytes (T cells), coordinate specific immune responses against pathogens; Natural killer cells (NK), are immune cells that target and eliminate infected or cancerous cells; B lymphocytes (B cells), produce antibodies as part of the immune response; B-cell lymphoma 2 (BCL-2), is a protein involved in regulating apoptosis or programmed cell death; Inhibitor of apoptosis proteins (IAPs), regulate cell death processes; Survivin is a protein that inhibits apoptosis and promotes cell survival; Vascular cell adhesion molecule 1 (VCAM-1), is involved in inflammation and immune cell adhesion; Matrix metalloproteinases (MMPs), are enzymes responsible for degrading extracellular matrix components contributing to tissue remodeling and invasion. COX-2 is also associated with sporadic colorectal cancer development, as well as in familial adenomatous polyposis and hereditary colorectal cancer, indicating its involvement across different forms of diseases.
4 Obesity, inflammation, and cancer
Obesity is an increasing public health problem impacting 35% of US adults and escalating the risk of numerous cancer types, often correlating with unfavorable outcomes. Central to the progression of chronic conditions is chronic inflammation, characterized by an obesity-associated phenotype (Kolb et al., 2016). This inflammatory response initiates with an excessive nutrient intake and manifests in specialized metabolic tissues. White adipose tissue adipocytes are endocrine cells that secrete a spectrum of cytokines, hormones, and growth factors playing a pivotal role in obesity-associated inflammation (Gregor and Hotamisligil, 2011; Fasshauer and Blüher, 2015). Dysregulation of metabolic signaling pathways, including NF-κB, c-Jun N-terminal kinase (JNK), nuclear factor B, and protein kinase R results from unhealthy lifestyles and imbalanced dietary habits (Kolb et al., 2016).
Simultaneously, obesity triggers increased endoplasmic reticulum (ER) stress, activating of NF- κB and JNK, escalating oxidative stress, and positively regulating proinflammatory cytokines (Cnop et al., 2012). All these pathways collectively contribute to the initiation of obesity-associated inflammation. Although localized in white adipose tissue, this low-grade inflammatory response extends its influence on other tissues like the liver, pancreas, and brain (Cildir et al., 2013). Furthermore, the inflammatory response linked to obesity leads to changes in immune cell infiltration and polarization within obese white adipose tissue compared with lean white adipose tissue (Han and Levings, 2013).
Macrophages, the primary immune cell population recruited to white adipose tissue serve as a significant source of proinflammatory cytokines in this context (Weisberg et al., 2003). The adipose tissue of obese individuals not only features increased macrophages but also tends to shift them from an anti-inflammatory M2 phenotype to a proinflammatory M1 phenotype (Lumeng et al., 2007), partly due to an imbalance of obesity-related adipokines (e.g., leptin to adiponectin ratio). This dysregulation, marked by elevated leptin production (proinflammatory, pro-angiogenic, and pro-proliferative) and reduced adiponectin production (anti-inflammatory, anti-angiogenic, and anti-proliferative) (Kolb et al., 2016), is associated with an increased risk of colon cancer in men due to the association with high leptin levels (Stattin et al., 2003; Stocks et al., 2008). Leptin has been demonstrated to promote proliferation, survival, and invasive potential in colon cancer cells by activating MAPK, PI3K, NF-κB, and STAT3 signaling (Rouet-Benzineb et al., 2004; Uchiyama et al., 2011; Wang et al., 2012).
Studies suggest that white adipose tissue macrophages in obese individuals express inflammatory cytokines associated with M1 macrophages but lack other M1 macrophage characteristics (Kratz et al., 2014). These macrophages along with adipocytes, release over 50 different cytokines, hormones, and chemokines, contributing to the chronic inflammation associated with obesity (Balistreri et al., 2010; Sun et al., 2011). Inflammation and inflammatory cytokines play a pivotal role in the development of colitis-associated sporadic CRC (Terzic et al., 2010; Moossavi and Bishehsari, 2012). Altered expression of TNF-α, a potent inducer of IL-6, has been observed to promote the development of colorectal and breast cancer (Sun et al., 2012; Taniguchi and Karin, 2014b). Moreover, a plausible link between obesity and increased incidence of Estrogen Receptor-positive (ER+) breast cancer in postmenopausal women has been noted, due to elevated circulating estrogen levels resulting from increased androgen aromatization in adipose tissue (Lorincz and Sukumar, 2006; Kolb et al., 2016).
5 Senescence
Age stands out as the most significant risk factor for cancer development as evidenced by an exponential increase in the incidence of most cancers with advancing age (Hsu, 2016). This observation suggests the existence of aging-associated factors that contribute to the initiation and progression of tumors. Certain features of aging, including epigenetic changes, mitochondrial dysfunction, and alterations in proteostasis, among others, share commonalities with characteristics observed in carcinogenesis. Contrary to the initial belief that senescent cells arrested tumor progression due in part to their characteristic growth arrest, accumulating evidence indicates that these cells present in higher numbers in older individuals and cancer patients undergoing chemotherapeutic treatment, remain metabolically active. Moreover, they secrete a combination of inflammatory agents, growth factors, and proteases, collectively referred to as senescence-associated secretory phenotype (SASP) (López-Otın et al., 2013). SASP manifests as an inflammatory dysregulation observed in aged mammals and is associated with tumor initiation and progression. It contributes to the creation of a favorable TME or directly influences the intrinsic properties of tumor cells (Morales-Valencia and David, 2021). This revelation underscores the intricate relationship between aging, senescence, and cancer development, highlighting the dynamic and multifaceted nature of these processes.
Several studies have explored the impact of senescence on cancer initiation. In cellular models of lung (H460), colorectal (HCT116), and murine breast cancers (4T1), induced senescence by exposure to etoposide or doxorubicin, resulted in the renewal proliferation and the formation of tumors when implanted in immunodeficient or immunocompetent mice (Saleh et al., 2019). B-cell lymphoma models revealed that cells induced to senesce by doxorubicin exposure exhibited a more aggressive growth potential compared to non-senescent cells after chemotherapy (Milanovic et al., 2018). Moreover, the accumulation of senescent cells in adipose tissue, particularly in visceral fat, has been linked to obesity with obese individuals having up to 30 times more senescent cells than non-obese individuals (Tchkonia et al., 2010; Liu et al., 2019). The presence of proinflammatory senescent cells in obese individuals holds clinical implications, especially given the substantial size of adipose tissue. This is particularly relevant as obesity-associated inflammation is known to be linked to cancer incidence and progression. Obese patients express elevated levels of SASP components such as IL-6, IL-8, and TNF-α, reflecting the increased levels observed in older adults (Morales-Valencia and David, 2021).
Forms of inflammation in carcinogenic development can be categorized based on their timing in cancer pathogenesis: 1) chronic inflammation preceding tumorigenesis, 2) inflammation caused by tumor progression, and 3) therapy-induced inflammation (Figure 4). Tumor cells interact with their microenvironment, comprising immune and stromal cells to suppress immune responses, while inflammatory processes shape the immune pathogenesis of cancer.
Figure 4. Description of the three types of inflammation based on their timing concerning cancer development: Chronic inflammation preceding tumorigenesis, Inflammation caused by tumor progression and Therapy-induced inflammation.
5.1 Chronic inflammation preceding tumorigenesis
It occurs before the initiation of tumorigenesis and is driven by factors such as infections, dysregulated immune responses, and environmental triggers. Environmental factors including Oxidative stress, exposure to mutagenic compounds, constant exposure to proliferative inflammatory stimuli, and defects in the epithelial barrier can initiate and promote chronic inflammatory reactions. The chronic inflammatory state induced by these factors may lead to DNA damage or epigenetic changes, creating a favorable environment for the development of tumors. Two events are crucial for inducing tumor development from normal cells: a tumorigenic event involving the accumulation of mutations or epigenetic alterations, and the clonal expansion of altered cells leading to tumor formation. Inflammation contributes to both events by inducing DNA damage, increasing oxidative stress from tissue-resident cells, or innate immune cells recruited to the TME in the absence of exogenous carcinogens (Meira et al., 2008; Schmitt and Greten, 2021).
5.2 Inflammation caused by tumor progression
This type of inflammation that supports tumor growth, is highly dependent on cell-cell interactions within the TME of sporadic tumors, promoting local growth and metastasis formation (Greten and Grivennikov, 2019). This protumor inflammatory response can be triggered by events such as hypoxia-induced cell death, fracture of the epithelial barrier and the subsequent entry of microbial compounds. These conditions within the tumor microenvironment contribute to the establishment of an inflammatory milieu that aids in the progression and survival of cancer cells. In CRC, loss of p53 function affects epithelial integrity activating NF-kB and STAT3 inflammatory pathways (Schwitalla et al., 2013). Hypoxia, nutrients deficiency in poorly vascularized tumor areas and necrotic cell death, lead to the secretion of proinflammatory factors (Jorgensen et al., 2017; Kim et al., 2019). Hypoxia also induces hypoxia-inducible factor 1α (HIF1α) expression, activating tumor-associated fibroblasts and recruiting immune cells, including monocytes, macrophages, and B-cells to the TME (Ammirante et al., 2014). In CRC, hypoxic stress, and elevated TGFβ levels, favor the differentiation into regulatory T-cells (Treg cells) suppressing effector T-cell differentiation and affecting antitumor immunity (Westendorf et al., 2017; Schmitt and Greten, 2021).
5.3 Therapy-induced inflammation
This is an unintended consequence of therapy rather than its objective; but it plays a decisive role in determining therapeutic response and the probability of relapse, exhibiting potential antitumor or protumor effects, depending on the specific context. Following therapy, tumor cells, undergo necrosis, releasing damage-associated molecules, or neoantigens, which recruit and activate antigen presenting cells (APCs) (Schmitt and Greten, 2021) which are capable of presenting neoantigens to T-cells and activating de novo responses and enhance immunosurveillance (Ghiringhelli and Fumet, 2019). However, this process can also contribute to tumorigenesis and the suppression of antitumor immunity. For instance, IL-1α released by necrotic cells promotes malignant transformation, angiogenesis, and metastasis. Simultaneously, it activates and polarizes fibroblasts towards an inflammatory phenotype, fostering tumorigenesis (Sahai et al., 2020). Conversely, ionizing radiation has been observed to increase the population of Treg cells in skin cancer (Price et al., 2015), while drugs like oxaliplatin induce the recruitment of plasmacytes expressing immunosuppressive markers such as IgA, IL-10, and PD-L1, in a TGF-β receptor signaling-dependent manner in prostate cancer (Shalapour et al., 2015). It is crucial to note that therapy-induced tumor cell death promotes the production of growth factors and cytokines, including WNT, EGF, TNF, IL-17, and IL-6, by cells in the TME to promote the survival of remaining tumor cells and play a role in fostering therapy resistance (Greten and Grivennikov, 2019). The release of damage-associated molecular patterns (DAMPs) from necrotic cells and the TME can trigger tumor-promoting inflammation that can impact the overall dynamics of the tumor microenvironment, influencing the course of cancer progression.
Understanding these distinct types of inflammation and their temporal association with cancer pathogenesis is crucial for developing targeted interventions and therapeutic strategies tailored to the specific inflammatory context at different stages of cancer development.
6 Therapeutic approaches in cancer
Therapeutic strategies targeting cancer-associated inflammation include the exploration of anti-inflammatory drugs, particularly non-steroidal anti-inflammatory drugs (NSAIDs), which function by inhibiting COX enzymes. Epidemiological and preclinical data indicate the potential utility of these drugs in cancer prevention and treatment (Crusz and Balkwill, 2015; Wong, 2019; Zappavigna et al., 2020; Michels et al., 2021). As an example, aspirin, an NSAID, has demonstrated promise in reducing the risk of esophageal, liver, breast, and colorectal cancer and it is associated with a reduced risk of metastasis, particularly in patients with adenocarcinomas (Table 3) (Algra and Rothwell, 2012; Rothwell et al., 2012).
Table 3. Preventive and anticancer effects of some anti-inflammatory drugs.
Despite these promising findings, it is crucial to exercise caution in the use of NSAIDs other than aspirin due to potential risks. The use of such drugs has been associated with an increased risk of bleeding, myocardial infarction, gastrointestinal bleeding, and renal failure. These adverse effects arise from the modulation of signaling pathways by NSAIDs, emphasizing the need for careful evaluation when considering the use of alternative NSAIDs for cancer treatment and prevention. It is essential to recognize that the underlying mechanisms and potential side effects of these drugs are not yet fully understood (Wong, 2019; Michels et al., 2021).
Another therapeutic approach for cancer-associated inflammation involves selectively suppressing crucial proinflammatory mediators, using blockers specifically targeting TNF-α (Hou et al., 2021), NF-κB (Shishodia et al., 2003; Capece et al., 2018), and COX-2 (Chatterjee et al., 2018). However, many potential inflammatory biomarkers lack cancer specificity (Eugen-Olsen et al., 2010), necessitating a thorough assessment to ensure their utility in patients follow-up, therapeutic response, and cancer-associated inflammation monitoring.
While C-reactive protein (CRP) has been suggested as a potential inflammation biomarker, its expression levels can be influenced by several factors. Additionally, the presence of multiple CRP isoforms makes it difficult to establish a direct relationship with cancer development (Roe, 2021a). Other markers, such as cytokines IL-6 (Masjedi et al., 2021), TNFα (Michels et al., 2021), and IL-8 (Khandia and Munjal, 2020), among others (Table 4), highlight the importance of establishing a classification system. Despite progress, there is currently no consensus on the causative factors that influence the levels of these markers in the context of cancer-associated inflammation (Roe, 2021a). Additional research is imperative to refine our understanding of the specificity of inflammatory markers (Bhavsar et al., 2014) while there is evidence indicating a pivotal role of proinflammatory cytokines, enzymes, and transcription factors in promoting tumorigenesis, it is important to note that the inhibition of proinflammatory pathways may not always be beneficial (Sethi et al., 2012). For instance, the transcription factor NF-kB, closely related to various cancer features (Capece et al., 2018), has been found to exert inhibitory effects on tumor development (Dajee et al., 2003). This duality underscores the complexity of inflammatory pathways, and inhibiting them might act as a double-edged sword, influencing tumor progression in multifaceted ways. Thus, understanding the intricate interplay between inflammation and cancer is essential to develop targeted and effective therapeutic interventions (Michels et al., 2021).
Table 4. Example of classification of inflammatory factors and effects on cytokine levels.
An alternative therapeutic approach to modulate chronic inflammatory process involves the use of plant-derived products, which enclose a diverse array of compounds with pleiotropic properties capable of impacting molecular pathways common to both inflammatory phenomena and cancer (Garcia et al., 2014; Cragg and Pezzuto, 2016). Regular inclusion of these compounds in the diet, or their use in the treatment of established diseases has demonstrated potential in preventing inflammation (Figure 5).
Figure 5. Main risk factors and inflammatory molecules associated with chronic diseases. Adapted from (Gupta et al., 2018b) with additional elements from (Suryavanshi et al., 2021).
Many cancer patients incorporate plant-derived products into their regimen during antineoplastic therapy, either to mitigate the side effects of conventional therapy or as adjuvants to enhance therapeutic outcomes (Desai et al., 2018). An illustrative example of the pleiotropic properties of plant-derived products is curcumin, a derivative of Curcuma longa which can modulate the arachidonic acid pathway (Yarla et al., 2016). Curcumin negatively regulates COX-2 expression by inhibiting NF-κB (Hong et al., 2004; Garcia et al., 2014). Furthermore, curcumin modulates the AKT/mTOR pathway and the expression of MMP-9 (Shishodia et al., 2003), a member of the MMP family regulating metastasis development (Chatterjee et al., 2018).
Despite promising results obtained with curcumin in animal models and humans, including encouraging effects on overall survival in patients with pancreatic and non-small cell lung cancer, further studies are needed to clearly define its utility in cancer treatment (Bahadori and Demiray, 2017). It is noteworthy that several MMP inhibitors like marimastat and tanomastat initially showing effectiveness comparable to conventional chemotherapeutics, faced challenges in clinical trials due to lack of selectivity and side effects (Nelson et al., 2017; Desai et al., 2018), such as musculoskeletal toxicity (Bramhall et al., 2001; Cathcart et al., 2015; Chatterjee et al., 2018). The pursuit of well-defined therapeutic profiles and safety considerations remains crucial for the development of effective plant-derived products in cancer treatment.
7 Endocannabinoid system (ECS)
The endocannabinoid system involves a complex interplay of components, which include lipid endocannabinoids (ECs) such as anandamide (AEA) and 2-arachidonoylglycerol (2-AG), synthesizing enzymes like NAPE-PLC and DAGL, hydrolyzing enzymes like FAAH and MAGL, and relevant receptors like a cannabinoid receptor-1 (CB1R), cannabinoid receptor-1 (CB2R), TRPV1, PPARγ, and GPR55 (Volkow et al., 2017). This system is ubiquitously distributed throughout the body, exerting diverse modulatory functions on various organs. Its notable impact on regulating food intake, perceiving pain, managing stress responses, influencing glucose tolerance, and controlling cell proliferation, differentiation, and metabolism highlights its potential therapeutic effect in cancer treatment (Pacher et al., 2020).
Alterations in the endocannabinoid system have been implicated in various diseases, including neurodegenerative disorders, multiple sclerosis, inflammation, and cancer (Laezza et al., 2020). Research has underscored the potential therapeutic effects of ECs in cancer treatment, with reports indicating antitumor effects in various cancer types, including breast cancer (Laezza et al., 2006), CRC (Lee et al., 2022; Silva-Reis et al., 2023), gliomas (Salazar et al., 2009; Costas-Insua and Guzmán, 2023), and others (Pisanti et al., 2013; Pagano et al., 2023).
Research indicates that conditions such as hypoxic stress can affect the endocannabinoid system, potentially increasing malignant activity in cells, such as glioblastoma cells. This effect is seen through the downregulation of CB1R and the upregulation of COX2 receptors (Sugimoto et al., 2017). Additionally, both physical and emotional stressors in these conditions can induce the release of adrenal corticosteroid hormones in both rodents and humans (Joëls, 2018). Elevated corticosteroids levels in serum have been linked to changes in the endocannabinoid system (Wamsteeker et al., 2010). Studies such as those conducted by Sugimoto et al. (2019), suggest that corticosterone may counteract the beneficial antitumor effects of ECs by reducing CB1R activity in glioblastoma models, thus promoting cancer growth. Given that stress is common in many diseases and corticosteroids are commonly used in treating inflammation and cancer, there is a debate about whether monitoring endocannabinoid levels could provide insights into disease progression by regulating their activity.
The evidence suggests that cannabinoids are potent anti-inflammatory agents for treating chronic inflammatory diseases, although the precise mechanisms are not fully understood. Many chronic inflammatory conditions, including Coronavirus Disease 2019 (COVID-19), involve a phenomenon called the cytokine storm, where there is an uncontrolled and severe inflammatory response leading to the accumulation of proinflammatory cytokines (Suryavanshi et al., 2022). Modulating the endocannabinoid system using cannabis derivatives and other medications (Romano and Lograno, 2007; Park et al., 2016; Mallet et al., 2023), presents a promising alternative for treating and mitigating such situations. This approach, as illustrated in Figure 6, could offer additional therapeutic benefits.
Figure 6. The interplay between arachidonic acid, endocannabinoids, and prostamides, along with drugs that modulate their expression, influences inflammatory-related diseases. LT receptor, leukotrienes receptor; LOX, lipoxygenase; CBD, cannabidiol; THC, tetrahydrocannabinol; NAPE-PLD, N-acylphosphatidylethanolamine-specific phospholipase D; PLC, phospholipase C; ABHD4, α/β-hydrolase domain-containing 4; AM404, N-arachidonoylphenolamine; Ca2+−NAT, calcium-dependent N-acyltransferase; PLA2, phospholipase A2; PLD, phospholipase D; FAAH, fatty acid amide hydrolase; and HETEs, hydroxyeicosatetraenoic acids.
8 Anti-inflammatory and anticancer effects of cannabinoids
Medical cannabinoids have demonstrated effectiveness in treating a range of diseases including Inflammatory Bowel Disease (IBD) (National Academies of Sciences, 2017), neurodegenerative disorders (Golub and Reddy, 2021), cancer (Mangal et al., 2021), anorexia, and weight loss (Bajtel et al., 2022; Pennant and Hinton, 2023). In the context of cancer, cannabinoids show promise as anticancer agents through several mechanisms:
1. Induction of apoptotic death in glioma (Velasco et al., 2016), hepatocellular carcinoma (Vara et al., 2011) and pancreatic cancer cells (Carracedo et al., 2006), by stimulating the synthesis of ceramide via CB1 and CB2 receptors. This process involves the upregulation of stress-regulated proteins, leading to inhibition of pathways promoting autophagy-mediated cell death.
2. Reduction of HIF-1α expression in Glioblastoma cells, resulting in decreased cancer cell growth and proliferation (Solinas et al., 2013).
3. Delayed tumor progression in human colon cancer cells by inhibiting HIF-1α expression and its target genes VEGF and COX-2 (Thapa et al., 2012), as well as activation of AMPK-related kinases to regulate energy metabolism in cancer cells (Dando et al., 2013).
4. Inhibition of cell proliferation and migration through GPR55 antagonism, leading to suppression of pathways promoting cancer cell survival and mobility (Pellati et al., 2018).
These findings suggest that cannabinoids hold potential as therapeutic agents against cancer, offering multiple avenues for intervention in cancer progression.
Cannabinoid medicines have gained approval from regulatory agencies including the United States Food and Drug Administration (FDA), as listed in Table 5. Notably, Phyto cannabinoids like Cannabidiol (CBD) and Tetrahydrocannabinol (Dronabinol, THC) have shown significant inhibition of NLRP3 inflammasome activation in macrophages following LPS + ATP stimulation. This leads to reduced levels of IL-1β. CBD also reduced NF-κB nuclear factor phosphorylation, while both CBD and THC mitigated post-LPS oxidative stress.
Table 5. Cannabis-based pharmaceutical drugs approved and marketed to 2023.
ELISA data reveals substantial reductions in IL-6, IL-8, and tumor necrosis factor α (TNF-α) levels in macrophages following LPS treatment. Additionally, both CBD and THC significantly reduce STAT3 phosphorylation in macrophages, attributed to decreased phosphorylation of tyrosine kinase-2 (TYK2) after LPS stimulation (Desai et al., 2018).
Another phytocannabinoid, tetrahydrocannabivarin (THCV) downregulates IL-1β, IL-6, TNFα, and COX-2 at the protein level, possibly due to its effects on various stages of gene expression. At concentrations of 5 μM and 15 μM, THCV effectively inhibits NF-κB activation, which controls the transcription of numerous proinflammatory proteins including Pro-IL-1β, IL-6, Pro-TNFα, and COX-2 (Gojani et al., 2023).
Evidence suggests that CBD can suppress EGF/EGFR signaling, and downstream targets such as NF-κB, play roles in inflammation and cell growth regulation (Pellati et al., 2018). Additionally, it has been demonstrated that CBD and CBG can ameliorate inflammation in animal models of IBD (Borrelli et al., 2013; Hasenoehrl et al., 2016). Given the close association between IBD and an increased risk of CRC (Lucafò et al., 2021), recent research by Jeong et al. (2019), demonstrated the CBD’s ability to inhibit the induced dose-dependent growth and apoptosis of human CRC cells, while sparing normal colorectal cells. Additionally, CBD reduced tumor volume and stimulated apoptosis in a xenograft model, indicating its potential efficacy as a reliable anticancer agent in vivo (Jeong et al., 2019). Furthermore, a pilot study by Ng et al. (2023) involving three CRC patients, revealed that THC could alleviate CRC cachexia associated with inflammation and immune responses. After THC treatment, a decrease was observed in the level of six cytokines in serum samples, including IL-6 and TNF-α, as well as chemokine (C-C motif) ligand 2 (CCL2), known for its unfavorable effects on tumor prognosis (Jin et al., 2021), and reviewed elsewhere (Xu et al., 2021). These findings collectively underscore the promising therapeutic potential of cannabinoids in addressing inflammation and combating CRC progression.
Cannabichromene (CBC) interacts with CB1 and CB2 receptors, influences cellular endocannabinoid reuptake and acts as an agonist on TRPA1 and adenosine receptors. These actions lead to downstream effects such as suppression of MAGL function, decreased intracellular nitric oxide (NO) and IFNγ levels in macrophages, and modulation of cytokine and COX-2 gene transcription. The precise mechanisms underlying CBC’s anti-inflammatory properties involve both CB1R and CB2R mediated signaling as well as TRPA1 agonism (Udoh et al., 2019), which helps mitigate inflammatory responses associated with cytokine and COX-2 transcriptional modulation (Gojani et al., 2023). On the other hand, Cannabinol (CBN) modulates NFκB activation primarily by regulating phosphorylation rather than transcription. It has a dose-dependent effect on P-NFκB levels, with lower doses yielding more pronounced effects. While CBN upregulated the transcription of COX-2 and Pro-TNFα genes, it simultaneously decreases their protein levels, suggesting a potential post-transcriptional mode of action. Additionally, CBN exhibited inhibitory effects on IL-1β and IL-6 gene transcription, likely mediated by negative regulation of NF-κB phosphorylation and activation (Gojani et al., 2023).
Overall, both CBC and CBN demonstrated diverse anti-inflammatory properties through distinct mechanisms. CBCs effect appear to involve modulation of cannabinoid reuptake TRPA-1 agonism and CB receptor signaling, while CBN primarily exerts its effects through regulation of NFκB phosphorylation and potential post-transcriptional mechanisms (Gojani et al., 2023). These findings support the potential use of cannabinoids as anti-inflammatory agents for various chronic inflammatory diseases and provide insights into their mechanisms of action.
9 Analysis and conclusion
This extensive review highlights the urgent need for further research to discover valuable biomarkers for cancer diagnosis, prevention, and treatment. The relationship between obesity, chronic inflammation, and cancer emphasizes the importance of population-based interventions, including the maintenance of healthy body weight as a preventive measure (Kolb et al., 2016; Lauby-Secretan et al., 2016). Moreover, the association between the dietary inflammatory index and increased cancer risk suggest the potential effectiveness of an anti-inflammatory diet supplemented with nutraceuticals (Jayedi et al., 2018) and coupled with a healthy lifestyle for cancer prevention (Michels et al., 2021).
Furthermore, the characteristics of senescence and the impact of SASP on TME provide opportunities for developing improved therapeutic strategies. Understanding the vulnerabilities associated with senescence and the inflammatory phenomena linked to carcinogenesis can inform targeted interventions. The use of natural products and their derivatives emerges as a promising therapeutic alternative or as an adjuvant for cancer-related inflammation, often presenting a more favorable adverse effect profile than conventional therapeutic agents (Deng et al., 2017; Desai et al., 2018; Deng et al., 2020). However, the development of drugs based on bioactive natural products poses challenges due to their inherent variability, complexity and the need for standardization and rigorous research processes (Desai et al., 2018; Huang et al., 2021).
In addition, anti-inflammatory products, including NSAIDs (Zappavigna et al., 2020), corticosteroids (Wang et al., 2004), and statins, (Masjedi et al., 2021), along with plant-derived products hold clinical utility as adjuvants to traditional therapies. Their potential accessibility and known safety profiles, make them an attractive alternative for the general population. Combining anti-inflammatory drugs with adjustments in dosage and dosing regimens could represent a novel strategy in antitumor therapy (Binnewies et al., 2018; Zappavigna et al., 2020).
Moreover, the exploration of endocannabinoid, cannabinoid, and prostamide-type compounds as potential therapeutic targets or biomarkers of inflammatory and immune processes in tumor development requires further investigation to elucidate their pharmacology and significance before transitioning to clinical practice. Recent evidence suggests that cannabinoids may inhibit tumor cell proliferation and serve as supportive therapy for anti-tumor treatments due to their multiple therapeutic targets contributing to anti-neoplastic effects. Ongoing clinical studies with nabiximols (Sativex) indicate promising potential in the treatment of glioblastoma. The first, known as ARISTOCRAT (NCT05629702), is a phase II, multi-center, double-blind, placebo-controlled, randomized trial aimed at comparing the cannabinoid Nabiximols with a placebo in patients with recurrent MGMT methylated glioblastoma (GBM) treated with temozolomide (TMZ). The second study (NCT03529448) is a Phase Ib, open-label, multicenter, intrapatient dose-escalation clinical trial designed to assess the safety profile of the (THC:CBD 1:1) combination with temozolomide and radiotherapy in patients newly diagnosed with glioblastoma.
Understanding factors like genetic variability, environmental exposure history, dietary habits, microbiome composition, and cellular plasticity within the TME, promises insights into the intricate interrelationships governing carcinogenic phenomena and may contribute to the discovery of diagnostic or clinically relevant biomarkers (Greten and Grivennikov, 2019; Martin et al., 2021), establishing possible therapies based on molecular and genetic analysis in patients.
In conclusion, a Poly pharmacological approach to modulate the complex signaling of inflammation and cancer appears to be the most promising option. Given the systemic and multifactorial nature of inflammation (Hou et al., 2021), targeting multiple proteins involved in inflammation and cancer pathogenesis is deemed more effective than focusing on a single gene, protein, or signaling pathway. While short-term treatments may benefit from targeting a single therapeutic target, a comprehensive strategy that addresses the persistent nature of inflammation and the involvement of multiple signaling pathways in cancer cells is crucial for long-term success.
Author contributions
AT-S: Conceptualization, Investigation, Methodology, Writing–original draft. SC-H: Conceptualization, Resources, Writing–review and editing. LM-G: Conceptualization, Project administration, Writing–review and editing. PM-C: Conceptualization, Writing–review and editing. JR-G: Conceptualization, Funding acquisition, Investigation, Supervision, Validation, Writing–review and editing.
Funding
The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. This research was funded by Instituto Nacional de Cancerología Grant Number XRPM: C19010300-454, (to JR).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Abbreviations
NSAIDs, non-steroidal anti-inflammatory drugs; BAX, Bcl-2-associated protein X; CRC, colorectal cancer; COX, cyclooxygenase enzymes; ECs, endocannabinoids; gp130, glycoprotein 130; IL-6, interleukin-6; IL-10, interleukin-10; JAK, janus kinase; NF-κB, nuclear factor-κB; MMP, matrix metalloproteinases; STAT, signal transducer and activator of transcription; STAT3, signal transducer and activator of transcription 3; TAM, tumor-associated macrophages; TME, tumor microenvironment; TNFα, tumor necrosis factor-α; HPV, human papillomavirus.
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Keywords: chronic inflammation, cancer, obesity, immune cells, cannabinoids, endocannabinoid system, non-steroidal anti-inflammatory drugs
Citation: Turizo-Smith AD, Córdoba-Hernandez S, Mejía-Guarnizo LV, Monroy-Camacho PS and Rodríguez-García JA (2024) Inflammation and cancer: friend or foe?. Front. Pharmacol. 15:1385479. doi: 10.3389/fphar.2024.1385479
Received: 12 February 2024; Accepted: 22 April 2024;
Published: 10 May 2024.
Edited by:
Chiara Bolego, University of Padua, ItalyReviewed by:
Gabriela Cristina Fernandez, National Scientific and Technical Research Council (CONICET), ArgentinaLucia Conti, National Institute of Health (ISS), Italy
Copyright © 2024 Turizo-Smith, Córdoba-Hernandez, Mejía-Guarnizo, Monroy-Camacho and Rodríguez-García. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Josefa Antonia Rodríguez-García, anJvZHJpZ3VlekBjYW5jZXIuZ292LmNv