Diallyl Disulfide: A Bioactive Garlic Compound with Anticancer Potential

Cancer is a life-threatening disease caused by the uncontrolled division of cells, which culminates in a solid mass of cells known as a tumor or liquid cancer. It is the leading cause of mortality worldwide, and the number of cancer patients has been increasing at an alarming rate, with an estimated 20 million cases expected by 2030. Thus, the use of complementary or alternative therapeutic techniques that can help prevent cancer has been the subject of increased attention. Garlic, the most widely used plant medicinal product, exhibits a wide spectrum of biological activities, including antibacterial, hypo-lipidemic, antithrombotic, and anticancer effects. Diallyl disulfide (DADS) is a major organosulfur compound contained within garlic. Recently, several experimental studies have demonstrated that DADS exhibits anti-tumor activity against many types of tumor cells, including gynecological cancers (cervical cancer, ovarian cancer), hematological cancers (leukemia, lymphoma), lung cancer, neural cancer, skin cancer, prostate cancer, gastrointestinal tract and associated cancers (esophageal cancer, gastric cancer, colorectal cancer), hepatocellular cancer cell line, etc. The mechanisms behind the anticancer action of DADS include epithelial-mesenchymal transition (EMT), invasion, and migration. This article aims to review the available information regarding the anti-cancer potential of DADS, as well as summarize its mechanisms of action, bioavailability, and pharmacokinetics from published clinical and toxicity studies.

1 Introduction

Cancer is a severely detrimental health condition that is experienced by people across the world. The number of cancer-afflicted patients is rising rapidly and is estimated to be around 20 million by 2030 (Nussbaumer et al., 2011; Munari et al., 2014; Siegel et al., 2016; Society, 2016). Unbridled cellular growth leads to the modification of internal cellular or tissue materials as well as genetic instabilities, converting normal, healthy cells into malignant ones (Feller et al., 2013; Rauf et al., 2021). These genetic instabilities include mutations in the oncogenes, tumor suppressors, DNA repairing genes, and genes involved in the metabolism of cell growth (Dixon and Kopras, 2004). Cancer has several internal (hormonal abnormalities, genetic mutations, and the immune system) and external (smoking, cigarettes, drinking polluted water, food, radiation, chemicals, heavy metals, air, and infectious agents) causes (Bigby, 1988; Zhou et al., 2017; Mitra et al., 2022a). Thus, the discovery and development of phytochemical compounds that can be used as promising drugs for carcinoma treatment purposes have become a strong priority for researchers (Mitra et al., 2022e; Rahman et al., 2022).

Current therapeutic strategies for cancer treatment include surgery, radiotherapy, and chemotherapy, among others. However, patients undergoing these cancer preventative therapies experience intense stress; potentially leading to damaging, long-term health issues (Haberkorn, 2007; Moding et al., 2013; Mitra et al., 2022d). Several studies have shown that many medicinal plant species can be used to prevent or cure cancer (Mitra et al., 2021, 2022c; Islam et al., 2022). Anticancer effects have been observed in many plant species, especially in plants that have been utilized in traditional herbal treatments used in developing countries (Greenwell and Rahman, 2015). It is estimated that dietary modifications could prevent nearly one-third of current cancer cases (Brennan et al., 2010; Rastegari and Rafieian-Kopaei, 2016; Rauf et al., 2022).

Garlic, the most widely used plant in medicinal products, has several pharmacological properties, such as antibacterial, hypolipidemic, antithrombotic, and anticancer effects (Lai et al., 2013; Mikaili et al., 2013). Garlic oil is soluble in both oil and water, and it has long been considered to be both a dietary supplement and an anticancer agent (Omar and Al-Wabel, 2010). Experimental animal studies have shown that specific sulfur-containing compounds can chemically suppress carcinogenesis in different organs (Kim et al., 2014). Diallyl disulfide (DADS), a compound composed of two allyl groups connected by two sulfur atoms, is a vital organosulfur compound found in garlic (De Greef et al., 2021; He et al., 2021; Song et al., 2021). DADS is produced during the decomposition of allicin, and there have been many detailed studies regarding its medicinal applications (Liang et al., 2015). DADS, diallyl tetrasulfide, and diallyl trisulfide are the key elements of distilled garlic oil. DADS is a yellow liquid that has a distinct garlic odor and is not soluble in water. Allicin is released when garlic or other plants belonging to the family Alliaceae are crushed; DADS is produced during the decomposition of allicin. DADS can easily be oxidized to allicin in the presence of peracetic acid or hydrogen peroxide. Similarly, allicin hydrolyses to produce diallyl trisulfide and DADS. When DADS reacts with liquid sulfur, it produces diallyl polysulfide mixtures that can create unbroken sulfur chains up to 22 atoms in length (Yi and Su, 2013).

An increasing number of studies have found that DADS exhibits anticancer activity against several kinds of tumor cells, including gastric cancer, breast cancer, and colon cancer cell lines (Altonsy et al., 2012; Tang et al., 2013; Xiao et al., 2014). Specifically, the underlying mechanism behind the anticancer action of DADS involves inducing apoptosis, activating metabolizing enzymes that detoxify carcinogens, inhibiting the production of reactive oxygen species, suppressing DNA adduct formation, and regulating cell cycle arrest. DADS can also suppress the metastatic potential of tumors such as EMT, invasion, and migration (Tsubura et al., 2012).

The purpose of this review is to evaluate the existing information on the potential of the anticancer activities exhibited by DADS as well as its mechanism of action, while also summarizing toxicity and pharmacokinetic studies conducted on this substance.

2 In Vitro and In Vivo Preclinical Studies

2.1 Breast Cancer

DADS has been successfully shown to intrinsically induce the apoptosis pathway in breast cancer (Fulda and Debatin, 2006; Lei et al., 2008; Lee et al., 2011b; Williams et al., 2018). The apoptosis pathway is regulated by several complex molecules that affect the production of distinct antiapoptotic and proapoptotic proteins. The upregulation of activating caspase occurs during mitochondria-mediated apoptosis, which is regulated by the proteins of the Bcl-2 family. Proapoptotic molecules (Bax, Bim, and Bad) co-exist with a variety of antiapoptotic proteins in the Bcl-2 protein family but can improve the expression of antiapoptotic proteins. Bcl-2 proteins prevent the permeabilization of the outer mitochondrial membrane and suppress apoptosis (Elmore, 2007; Tait and Green, 2010; Elumalai et al., 2012; Marie Hardwick and Soane, 2013; Redza-Dutordoir and Averill-Bates, 2016). In comparison to DADS, DADS-SLN resulted in the increased expression of the proapoptotic proteins Bad, Bax, caspase-3, and caspase-9, while also reducing the expression of antiapoptotic proteins, including Bcl-2. This shows that DADS-SLN causes apoptosis via intrinsic signaling (Talluri et al., 2017).

The percentages of late and early apoptosis in the control samples were 0.8% and 0.7%, respectively; this was considerably lower than the 55.6% and 3.3% exhibited by DADS-SLN. These values were also considerably larger than that of the blank SLN (0.9% and 1.4%) and DADS (12.42% and 2.61%), indicating that DADS-SLN enhanced apoptosis after medicating for 24 h at a concentration of 8 µM. The greater proportion of apoptotic cells in DADS-SLN compared to DADS suggests that the former has a much larger impact on apoptosis. Blank-SLNs appeared to have very little effect on the MCF-7 cells in terms of apoptosis; this minor cytotoxicity may be related to excipients. Thus, the nano-encapsulation of DADS might improve its anticancer impact, which is mostly associated with the increased induction of apoptosis (Talluri et al., 2017). In another trial, the late and early apoptosis cells in a control sample accounted for 0.9% and 0.6% of the cells, respectively. The study showed that DADS-RAGE-SLN improved the apoptotic activity of DADS in MDA-MB231 cells (Siddhartha et al., 2018).

Altonsy et al. (2012) found that DADS causes apoptosis in MCF-7 breast cancer cell lines by interfering with cell-cycle development stages such that the sub-G₀ population increases and the synthesis of DNA are slowed significantly. In addition, DADS activates caspase-3 by inducing phosphatidylserine translocation from the inner to the outer leaflet of the plasma membrane. Additional research found that DADS regulates Bcl-w, Bcl-xL, Bcl-2, and Bax levels in cells in a dose-dependent manner, suggesting that the Bcl-2 proteins are involved in the apoptosis induced by DADS. Histone deacetylation inhibitors (HDACi) have been shown to reduce cancer cell growth and cause apoptosis. In the context of MCF-7 cells, DADS possesses HDACi characteristics because it prevents the loss of an acetyl group from the acetylated substrate and causes histone-4 (H4) hyperacetylation. Thus, the HDACi characteristics of DADS may be responsible for the activation of apoptosis in breast cancer cells (Altonsy et al., 2012). Another experiment found that miR-34a expression was upregulated in MDA-MB-231 cells that were treated with DADS. miR-34a suppressed breast cancer development both in vitro and in vivo while also enhancing the antitumor effectiveness of DADS. Specifically, miR-34a inhibits the expression of SRC, which results in the suppression of the Ras/SRC/ERK pathway. miR-34a can also be considered to be an effective agent for gene therapy procedures as it boosts the antitumor activity of DADS (Xiao et al., 2014).

DADS was used to pretreat (PreTx) MCF-10A cells in the presence of the carcinogen benzo(a)pyrene (BaP). MCF-10A cells were also co-treated (CoTx) with Bap and DADS for up to 24 h to evaluate the inhibitory influence of DADS on early carcinogenic events. The cells were monitored for any changes in the cell cycle, DNA damage, cell proliferation and viability, and the induction of peroxide formation. BaP tended to significantly increase cell proliferation at 6 h; DADS CoTx suppressed this phenomenon. Within 24 h, DADS prevented BaP-induced extracellular aqueous peroxide production; this behavior was independent of concentration or technique. Throughout DADS CoTx and PreTx, with notable suppression for every treatment sustaining after 6 h, DADS suppressed the single-strand break in DNA induced by BaP at all times. In normal cell lines, DADS was effective at inhibiting BaP-induced cell cycle transitions, cell proliferation, DNA damage, and the production of reactive oxygen species; thus, DADS may also suppress the environmentally-induced initiation of breast cancer (Nkrumah-Elie et al., 2012). The role of DADS, as well as the mechanisms behind its influence on breast cancer stem cells (BCSCs), were explored in a separate study. The findings showed that DADS reduced glucose metabolism and cell stemless in BCSCs. DADS also reduced the metastasis and the growth of BCSCs in vivo investigations by targeting the pyruvate kinase M2 (PKM2), CD44, and AMPK signaling pathways in BCSCs. An IHC analysis found that the expression levels of AMPK, CD44, and PKM2 were positively correlated in the tissues of 125 breast cancer patients. Furthermore, the positive expression of PKM2, AMPK, and CD44 was linked to poor overall survival and disease-free survival in patients (Xie et al., 2018). Furthermore, DADS caused the downregulation of MMP-9, the dysregulation of Bcl-2 family members, and the reversal of the epithelial-mesenchymal transition (EMT). Remarkably, DADS also suppressed the activation of the β-catenin signaling pathway, which is associated with the regulation of the Bcl-2 family, EMT, and MMP-9 in TNBC cells. The effectiveness of the anticancer properties of DADS was confirmed in MDA-MB-231 xenograft mice, which was consistent with the in vitro findings. Treating these mice with DADS appreciably lowered tumor weight and volume while raising apoptosis; in addition, active β-catenin expression levels were reduced and the downstream molecules underwent dysregulation (Table 1) (Huang et al., 2015).

TABLE 1

TABLE 1. Possible antineoplastic properties of DADS as well as their underlying mechanisms as established by in vitro research.

Bauer et al. (2014) demonstrated the anticancer properties by showing a prominent expression profile for the sustained release of IL-8, IL-6, plasminogen activator inhibitor-1, and TIMP1/2 in untreated/resting MDA-MB-231 cells using an initial chemokine/adipokine protein panel microarray. TNF-α (40 ng/ml) did not affect most of these molecules, except for a single large increase in CCL2 release (an approximately 1,300-fold upregulation). A sub-lethal dose of DADS (100 μM) inhibited and reversed the release of TNF-α-induced CCL2 (Bauer et al., 2014).

2.2 Gastrointestinal Tract and Associated Cancers

2.2.1 Esophageal Cancer

EC is the sixth most frequently occurring cancer. It has a terrible prognosis worldwide and affects about 450,000 people. At one point, squamous cell carcinoma accounted for around 90% of EC cases, although epidemiology has seen a shift in various western nations (Epidemiologic differences in esophageal cancer between Asian and Western populations; Kamangar et al., 2009; Sadjadi et al., 2010; Yang et al., 2020). The occurrence of esophageal adenocarcinoma (EAC) has been gradually increasing over the last 30 years, and currently outnumbers squamous cell cases (Dabrowski et al., 1998; Comprehensive and Network, 2014). One study showed that DADS halted cancerous cells in the G2/M phase by modulating proteins that were related to the cell cycle; this modulation was linked to a decrease in the production of cyclin B1, cdc25c, cdc2, and p-cdc2. Furthermore, DADS regulated cellular apoptosis by upregulating the ratio of Bax to Bcl-2, activating caspase-3, and downregulating the MEK-ERK signaling pathway. The activation of the p53/p21 pathway involves the suppression of the G2/M phase, the induction of apoptosis, and the inhibition of cell differentiation. Hence, DADS controlled esophageal squamous cell carcinoma (ESCC) cells via many signaling pathways and was revealed to be a prospective anticancer therapy for ESCC (Yin et al., 2014b).

Feng et al. (2017) investigated the chemopreventive effectiveness of DADS against Barrett’s esophagus (BE) as well as any potentially linked signaling pathways by treating BAR-T cells with deoxycholic acid (DCA) in the absence or presence of DADS. DADS was not observed to decrease cell viability for a given range of concentrations. Like PDTC, an NF-κB inhibitor, DADS suppressed the ROS production induced by DCA, IκBα phosphorylation, inflammation, and the production of p50 in the nucleus in a dose-dependent manner. By lowering the amount of Bcl-2, DADS also boosted the rate of cell apoptosis. DADS had a minimal cytotoxic effect on BAR-T cells. DADS exhibited an anti-inflammatory effect against BAR-T cells through the NF-κB signaling pathway and ROS inhibition. Furthermore, DADS inhibited the DCA-induced resistance of apoptosis via a mechanism that is NF-κB/Bcl-2 dependent, suggesting that it could be a promising option for the chemical prevention and treatment of EAC and BE (Feng et al., 2017). Yin et al. (2014a) found that DADS dramatically decreased the viability of human esophageal cancer ECA109A cells while being considerably less toxic to normal liver cells. Annexin V-FITC/propidium iodide (PI) staining identified the proapoptotic impact of DADS on ECA109 cells. Flow cytometry analysis revealed that DADS enhanced apoptosis in a dose-dependent manner and that the caspase-3 inhibitor Ac-DEVD-CHO could reduce the rate of apoptosis. In a xenograft trial conducted on nude mice, DADS therapy decreased the development of ECA109 tumors at concentrations of 20 mg/kg and 40 mg/kg with no apparent adverse effects. By suppressing the proliferation of nuclear antigen (PCNA) cells, DADS reduced the proliferation of ECA109. In ECA109 xenograft tumors, DADS activated a mitochondria-dependent network with the executor of caspase-3, increased the ratio of Bax and Bcl-2, increased p53 levels, and downregulated the ERK/MEK/RAF pathway. These findings suggest that DADS is an efficient and reliable anti-cancer agent against esophageal carcinoma (Table 1) (Yin et al., 2014a).

2.2.2 Gastric Cancer

With over an estimated one million new cases diagnosed in 2020 and 769,000 predicted deaths, gastric cancer remains a serious health concern across the world and ranks fifth in terms of its incidence and fourth in terms of its lethality (UICC, 2020; Sung et al., 2021). Its etiology might be influenced by several factors, including genetics and the environment. Garlic consumption is a commonly prescribed means of preventing gastric cancer (Wang et al., 2012; Shamshirian et al., 2018). Ling et al. (2014) showed the anticancer properties of DADS that it induced the buildup of phosphorylated Chk1 and had a downregulating effect on the expression of cyclin B1 and CDC25C. The overexpression of Chk1 resulted in a significant increase in G2/M arrest induced by DADS, the inhibition of CDC25C expression, and an increase in DADS-mediated Chk1 phosphorylation. Chk1 suppression decreased DADS-associated G2/M arrest and prevented the DADS-induced suppression of cyclin B1 and CDC25C. In addition, Chk1 signaling via CDC25C/Chk1/ATR/cyclin B1 mediated the DADS-induced G2/M checkpoint responses (Ling et al., 2014). By triggering apoptosis and increasing ROS generation, DADS considerably reduced the growth of AGS human gastric adenocarcinoma cells. DADS also decreased the expression levels of Bcl-2 in AGS cells while also increasing the expression levels of Bax, Fas, and caspase-3 (Lee et al., 2011a). DADS hindered the metastasis of type II esophageal-gastric junction adenocarcinoma cells (OE19) by suppressing the Akt/PI3K and NF-κB signaling pathways, downregulating uPA, MMP-9, and MMP-2 in the process (Yin et al., 2018). DADS inhibited cell proliferation by increasing tissue inhibitors of metalloproteinase (TIMP)-1 and TIMP2 mRNA levels and proteins while decreasing claudin proteins (claudin-3, claudin-4, and claudin-2), which are important components of tight junctions (TJs) (Park et al., 2011).

Tang et al. (2013) found that DADS inhibits cell proliferation and causes apoptosis via the Wnt-1 signaling pathway by upregulating miR-22 and miR-200b. Variations in the expression of miRNA were identified in DADS-treated MGC-803 cells, while the upregulation of miR-22 and miR-200b was also observed. Wnt-1 was also discovered to be a target of both miR-22 and miR-200b. miR-200b and miR-22 not only synergistically decreased gastric cancer development but also improved the antitumor effects of DADS both in vitro and in vivo. Thus, it was suggested that miR-22 and miR-200b could be used in possible gene therapy procedures to boost the antitumor effectiveness of DADS (Tang et al., 2013). By downregulating LIMK1, DADS prevented the epithelial-mesenchymal transition (EMT), preventing gastric cancer invasion and development. The expression of LIMK1 is linked with the differentiation, clinical stage, invasion level, lymph node metastasis, and poor diagnosis of tumors, both in vitro and in vivo (Bo et al., 2016). To investigate the potential of DADS-regulated molecules, Su et al. (2015) compared the protein expression profiles of DADS-treated gastric cancer MGC-803 cells to untreated control cells. 23 proteins with statistically important variations in expression were found through proteomic approaches, comprised of 14 downregulated proteins and 9 upregulated proteins. Ling et al. (2010) demonstrated that there was an association between the cell cycle arrest of G2/M and the phosphorylated forms of Chk1 buildup, but not Chk2; this suggests that the G2/M cell cycle arrest was associated with the DADS-induced growth suppression of the BGC823 gastric cancer cell line in humans. Additionally, Chk1 signaling via the Cdc25C/Chk1/cycling B1/ATR pathway mediates the DADS-induced G2/M checkpoint response; this process is independent of Chk2 (Ling et al., 2010). Bo et al. (2014) reported similar results; they found that Chk1, and not Chk2, was directly responsible for the arrest of G2/M, which is induced in the human gastric cancer BGC823 cells by DADS (Table 1). An in vitro trial conducted by Su (2012) found that DADS increased the acetylation of the H4 and H3 histones in human gastric cancer MGC803 cells in a time-dependent manner; this was supported by an increase in p21WAF1 protein levels increase and was consistent with the arrest of the G2/M phase cell cycle. DADS also exhibited dose-dependent antitumor effectiveness in an in vivo trial of MGC803-xenografted nude mice, resulting in the inhibition of tumor cell development and the arrest of the G2/M phase. Furthermore, the xenografted tumor cells exhibited distinct cell differentiation characteristics. These findings suggest that DADS, by causing the hyperacetylation of histones H4 and H3 while also boosting the expression of p21WAF1 in MGC803 cells, might trigger the arrest of the cell cycle and reduce cell proliferation, which may be responsible for its antitumor effects against gastric cancer (Su, 2012).

2.2.3 Colorectal Cancer

Well over 1.9 million new cases of colorectal cancer (CRC) are expected to be diagnosed in 2020, with an estimated 935,000 fatalities. CRC is the third most frequently-occurring cancer and has the second-highest mortality rate (1. Hyuna Sung et al., 2020; UICC, 2020). A lack of exercise or physical activity, obesity, as well as the consumption of alcohol, red meats, and tobacco are all known to contribute to the development of CRC. CRC fatalities can be reduced if it is detected and treated early. The use of garlic as a dietary supplement can help prevent and lower the risk of CRC (Fleischauer and Arab, 2001). DADS had a preliminary signaling impact on the SW480 colon cancer cell line by increasing Ca²⁺ mobilization (Chen et al., 2012). The DADS-induced apoptosis of colo205 cells was related to the elevated expression of transcription 1 (STAT1) signal activators and transducers (Lu et al., 2007). In HCT-116 cells, DADS triggered the arrest of the cell cycle in the G2/M phase, while also elevating the expression of p53 and cyclin B1 (Jo et al., 2008), as well as the production of ROS (Song et al., 2009). DADS targeted drug-resistant genes in human colon cancer cells (colo205). The expression levels of the multidrug resistance-associated protein-3 (MRP-3) were increased by DADS. DADS elevated the expression of the MRP6 and MRP4 genes while also inhibiting the growth of colo205 cells by lowering the Ras, PI3K, MEKK3, MKK7, JNK1/2, p38, and ERK1/2 expression levels, which consequently suppressed MMP-9, MMP-2, NF-κB, COX-2, and MMP-7 expressions levels (Lai et al., 2012, Lai et al., 2013).

DADS prevented colorectal tumorigenesis in mouse models through a process that involved the NF-κB signaling pathway and the nuclear localization of NF-κB, causing it to have a reduced activity while also inhibiting the activation of GSK-3β (Saud et al., 2016). An in vivo study using human colon cancer colo205 cells transplanted into mice revealed that DADS decreased the tumor’s weight and size (Lai et al., 2012). DADS dramatically decreased cell proliferation and triggered the arrest of the cell cycle in the G2/M phase in human colon cancer SW480 cells both in vitro and in vivo; this was most likely accomplished by downregulating cyclin B1, p53, and PCNA expression while upregulating p21WAF1 (Liao et al., 2007). Through the alteration of its intracellular redox environment, DADS suppressed the growth and arrest of the G2/M phase in human colon cancer HT-29 cells (Odom et al., 2009; Yang et al., 2009). The anti-proliferative properties of DADS against colon cancer HT-29 cells were linked to several genes that had varied expression patterns and that were engaged in different physiological systems (Huang et al., 2011). Colon-targeting DADS-loaded nanoparticles that had dual functionalities and a significant cytotoxic impact were successfully produced. In colon cancer therapy, ES100/PLGA-NPs might be a viable method of targeting water-insoluble bioactive phytochemicals with better safety measures and patient compliance. Furthermore, the polymeric mixture used can be precisely adjusted to create nano-carriers that can deliver dietary phytochemicals (Saraf et al., 2021).

DADS inhibited the expression levels and activity of Rac1 by inhibiting the PI3K/Akt pathway, preventing EMT as well as cell migration and invasion. The Rac1 knockdown improved the tumor prevention capabilities of DADS; in contrast, the overexpression of Rac1 counteracted its effects (Table 1) (Xia et al., 2019). In CRC cell lines, Kim et al. (2019) found that non-cytotoxic doses of DADS boosted tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)-related cell death. In addition, the synergistic impact between TRAIL and DADS was confirmed in vivo using mice models. One of the mechanisms involved in these observations was the reduced production of the antiapoptotic protein Bcl-2; the synergistic effect of DADS and TRAIL was diminished in cells with overexpressed Bcl-2. This study revealed new insights into the involvement of DADS in the TRAIL-associated suppression of CRC development via Bcl-2 inhibition (Kim et al., 2019). The overexpression of LIMK1 considerably aids colon cancer cell invasion and migration. DADS reduced cancer cell invasion and migration by decreasing the phosphorylation of ADF/cofilin via the suppression of LIMK1 in colon cancer cells. The knockdown and overexpression of LIMK1 increased and decreased DADS-induced cell proliferation suppression, respectively; this was confirmed both in vitro and in vivo. Similar results were observed in DADS-induced alterations to the expression of E-cadherin, Ki-67, CD34, and vimentin in xenografted tumors. These findings suggested that LIMK1 was a viable target molecule to enhance the anti-invasion and anti-migration effects of DADS on colon cancer cells (Su et al., 2017). By inhibiting histone hyperacetylation and HDAC while increasing the expression of cip1/p21waf1, DADS suppressed cell proliferation in HT-29 and Caco-2 cells. The cellular and molecular effects evoked by DADS are potentially connected to its impact on histone acetylation and thus contribute to its anti-carcinogenic capabilities in the colon (Druesne et al., 2004). In both short-term, solitary treatments as well as persistent, repetitive treatments, DADS caused rapid histone hyperacetylation in human tumor colon cell lines. Histone hyperacetylation is linked to anti-proliferative effects, including the arrest of the cell cycle in the G2/M phase and the increase of p21cip1 mRNA and protein expression levels (Druesne-Pecollo et al., 2008).

2.2.4 Hepatocellular Cancer

There were an estimated number of 906,000 new cases and 830,000 fatalities attributed to primary liver cancer in 2020. It is the most common form of cancer, has the highest mortality rate, and is the sixth most frequently diagnosed cancer worldwide (Anwanwan et al., 2020; Globocan, 2020; Sung et al., 2021). The two treatments available for liver cancer are immunotherapy and chemotherapy. However, new therapeutic approaches that incorporate natural ingredients may result in better prognoses. In particular, garlic has exhibited anticancer and preventative effects against liver cancer (Zhou et al., 2016). Through inhibition of IĸBα phosphorylation and NF-ĸB translocation in CCL4-induced liver injury, DADS boosted the levels of phase II antioxidant enzymes while simultaneously decreasing the expression of inflammatory mediators. This suggests that DADS activated the Nrf2 pathway, which enhanced antioxidant defense, inhibited NF- ĸB activation, and decreased inflammation (Lee et al., 2014). Another study found that DADS successfully reduced the acute hepatic damage caused by acetaminophen in rats. The beneficial impacts of DADS are due to its ability to regulate inflammatory reactions by suppressing NF-κB activation and reducing oxidative stress-mediated JNK activation by inhibiting CYP2E1 or by increasing antioxidant enzyme activity (Table 1) (Ko et al., 2017). DADS suppressed the critical regulators of lipid peroxidation, inflammation, and metabolism, while also having appreciable effects on nonalcoholic steatohepatitis (NASH) induced by high-fat diets (HFD) or methionine and choline-deficient diets (MCD) (Zhang et al., 2019a). The administration of DADS reduced cyclophosphamide-induced hepatotoxicity in rats by simultaneously upregulating both anti-inflammatory and antioxidant activity, demonstrating its promising therapeutic utility against the adverse effects of cyclophosphamide (Hasan et al., 2020). The pre-treatment of epithelial cells in CdCl₂-treated rat liver with DADS compounds exhibited a protective effect against the toxicity of CD by modulating cytokine protein production, which resulted in improved viability (Odewumi et al., 2019).

Table 1 demonstrates the possible antineoplastic properties of DADS as well as their underlying mechanisms as established by in vitro research.

2.3 Gynecological Cancers

2.3.1 Cervical Cancer

Cervical cancer is the fourth most common cancer, with 342,000 fatalities and 604,000 new cases diagnosed in women globally in 2020. Middle and low-income nations accounted for over 90% of cases worldwide (Sung et al., 2021; Mitra et al., 2022b). Thus, therapeutic treatments that use natural products are urgently needed. Several experimental studies have shown that DADS is effective against cervical cancer. Di et al. (2015) investigated the molecular mechanisms associated with DADS using human cervical cancer cells. As radiotherapy is the most basic form of treatment, HeLa cells were treated with 10 µM of DADS before being exposed to radiation, increasing their radiosensitivity and reducing cell viability. DADS pre-treatment reduced the radiation-induced arrest of the G2/M phase while also boosting radiation-induced apoptosis. In addition, coupled DADS and radiation treatment boosted the activation of apoptosis pathways as well as increased the Tap73 (proapoptotic) to Np73 (antiapoptotic) ratio and the levels of APAF1 and FASLG downstream proteins (Di et al., 2015). DADS had a substantial anti-proliferative impact on Caski cells, dose-dependently decreasing cell viability and increasing intracellular ROS production and apoptosis. Downregulating cyclin CDK4 and D1 and the overexpression of p27KIP1 and p21WAF1/CIP1 inhibitors of CDK enhanced the ability of DADS to arrest the G0/G1 cell cycle in Caski cells. DADS also downregulates the viral oncogenes E7 and E6 while restoring the functions of p53 (Ansari et al., 2020).

2.3.2 Ovarian Cancer

Ovarian cancer is the seventh most frequent disease in women across the globe and the 18th most prevalent cancer. In 2012, there were almost 239,000 new instances of ovarian cancer in women, which accounts for approximately 4% of all new cancer cases in women (2% of all cancer cases across both genders). Ovarian cancer is generally lethal. The age-standardized prevalence rate of this cancer ranges from less than 5 per 100,000 in Africa to more than 11 per 100,000 in Eastern and Central Europe (Sánchez et al., 2013). To mitigate the extreme prevalence of ovarian cancer, novel therapeutics must be considered. DADS has been used for decades to treat this disease. SK-OV-3 and OVCAR-3 cells were incubated with different concentrations of DADS to explore the influence of the DADS-induced arrest of the G2/M phase on the development and death of ovarian cancer cells as well as the molecular mechanisms that are involved in this process. The test was run on xenograft models in vivo which demonstrated that the inhibition rate of cell proliferation dramatically increased as the concentration of DADS increased. The suppression rates of the OVCAR-3 and SK-OV-3 cells were noticeably greater at 24 h than at 12 and 48 h, demonstrating remarkable time-dependency. Another test demonstrated that when OVCAR-3 and SK-OV-3 cells were medicated with DADS of various concentrations, the rates of apoptosis increased as the concentration of DADS. Notably, the apoptosis rates of DADS treated OVCAR-3 and SK-OV-3 cells at 24 h were much greater than the rates at 12 and 48 h. The intraperitoneal injection of a solution containing DADS significantly reduced the volume of xenografted cancer cells in the ovaries of nude mice compared to the blank control groups. When 30 mg/L of DADS was administered to OVCAR-3 and SK-OV-3 cells for 24 h, the proportion of OVCAR-3 and SK-OV-3 cells in the G2 phase rose dramatically compared to the blank cells. Survivin, PCNA, and Ki-67, which are associated with cell apoptosis and proliferation, were all dramatically reduced while the levels of the protein cleaved-caspase3 significantly increased [54].

2.4 Hematological Cancers

2.4.1 Leukemia

The type of leukemia is determined by the type of malignant blood cell and the rate at which it proliferates (Van Den Heuvel-Eibrink, 2004). Leukemia is the most frequent cancer in patients older than 55 while also being the most prevalent illness in children younger than 15 years old (Deschler and Lübbert, 2008). In the cell lines of NB4 and K562 myeloid leukemia, autophagy and apoptosis could both be triggered by DADS via the mTOR pathway (Tan and Xiao-xia, 2011). After treatment with DADS at different concentrations for 24–48 h, it was found that DADS suppressed cell viability and increased the apoptosis rate in a time- and dose-dependent manner. The expression of mTOR was significantly reduced in cells that had been treated with DADS and mTOR inhibitors. Cells treated with 10 µM of mTOR inhibitor and 100 g/ml of DADS exhibited high rates of autophagy and death (Suangtamai and Tanyong, 2016). DADS halted cells at the G0/G1 stage and reduced the proliferation, invasion, and migration of HL-60 cells. DADS also lowered the capacity of NBT, improved the expression of CD11b, slowed tumorigenesis, and promoted differentiation in xenografts in vivo (Table 2). The expression of Rho GDP dissociation inhibitor 2 (Rho GDI2), Dj-1, Calreticulin (CTR), PCNA, and cofilin 1 were all lowered by DADS (Ling et al., 2017). DADS suppressed DJ 1-mediated migration and invasion in leukemic cells by inhibiting the Src-Fak-Integrin signaling pathway; the Src inhibitor synergistically improved the anticancer effects of DADS (Liu et al., 2018). Due to the reduced ability of nitro-blue tetrazolium as well as elevated CD33 and CD11b expressions, 8 µM of DADS inhibited cell migration, proliferation, and invasion, while also causing differentiation. DADS significantly decreased the generation of phosphorylated cofilin 1 in HL 60 leukemia cells. DADS also decreased the protein and mRNA expression of Rac1, LIM domain kinase 1 (LIMK1), and Rho-associated protein kinase 1 (ROCK1), as well as LIMK1 phosphorylation in HL 60 cells (Ling et al., 2020).

TABLE 2

TABLE 2. Potential antineoplastic effects of DADS and its underlying mechanisms based on in vivo studies.

NADPH oxidase is another key ROS source that is enhanced by DADS. Rac2 activated the c-JNK pathway in DADS-induced apoptosis but did not activate the p38 pathway. NADPH oxidase, reactive oxygen species, and Rac2 played a role in the DADS-induced apoptosis of HL 60 human leukemia cells (Yi et al., 2010). The expression of DJ 1 proteins was significantly reduced in the cytoplasm when the HL 60 cells were exposed to 1.25 mg/L DADS over 8 h. However, the expression DJ 1 was greatly elevated in the nucleus fractions compared to the untreated controls. Following treatment with 5 mg/L and 10 mg/L of DADS, the expression levels of DJ 1 proteins were dramatically reduced in the mitochondria of the HL 60 cells. These findings revealed that exposing HL 60 cells to low dosages of DADS increases the translocation of the DJ one protein from the cytoplasm to the nucleus, suggesting that DJ one could be a cofactor binding protein or transcription factor in cell differentiation. The expression of DJ one in mitochondria may be connected to the induction of apoptosis in HL 60 cells that were exposed to moderate concentrations of DADS (Li et al., 2016). Calreticulin (CRT) played a significant role in human acute myeloid leukemia (AML) cell invasion and proliferation and is the subject of a significant amount of research. Yi et al. (Yi et al., 2016) found that CRT caused cell differentiation, proliferation, and invasion in DADS-treated HL 60 cells, as evidenced by the DADS-induced CRT downregulation across differentiated HL 60 cells. Following DADS-induced differentiation, CRT expression levels decreased while C/EBPα expression levels increased in the HL 60 cells. In severe combined immunodeficiency mice injected with HL 60 cells, DADS reduced tumor tissue growth in vivo, decreased levels of CRT, and increased C/EBPα. Furthermore, it was demonstrated that the DADS-mediated increased expression of C/EBPα and decreased expression of CRT expression resulted in an upregulation of reactive oxidant species. In an RNA immunoprecipitation experiment, CRT bound to C/EBPα mRNA, indicating that it controls C/EBPα mRNA degradation by conjugating with UGrich elements in the 3′ untranslated region (Sun et al., 2019). The DADS-induced arrest of the G2/M phase in HL-60 cells may be linked to the activation of p38 MAP kinase. Following the expression of phospho-Cdc2 and phospho-Cdc25B, DADS elevated the expression levels of phospho-p38 MAPK and activated the G2/M checkpoint when HL-60 cells were exposed to 20 µM/L of DADS over 12 h (Tan et al., 2004).

DADS dramatically inhibited the growth of HL-60 cells by suppressing the expression of VEGF mRNA and the generation of VEGF proteins in HL-60 cells, leading to anti-leukemic effects (Fan et al., 2006). As the concentration of DADS was increased, the number of K562 cells reduced significantly, and the form of some of the fixed K562 cells became irregular, resulting in a twisted membrane. The number of green spots in the stained cells increased as the concentration of DADS increased. The rate of autophagy in K562 cells increased steadily after 48 h of DADS culture. The groups that had been exposed to 20, 40, and 80 mg/L of DADS exhibited greater autophagy rates compared to the group of blank control, of which the group that had been exposed to 40 mg/L of DADS exhibited the highest autophagy rate. There was no discernable variation in the expression of ERK protein between groups, but the expression of p-ERK and LC3-II proteins increased as the concentration of DADS increased; a substantial change in the expression of the proteins of the 40 mg/L DADS group was also observed. DADS activated the MEK-ERK signaling pathway through the phosphorylation of ERK, which induced autophagy in the K562 cells (Ye and Yin, 2017).

2.4.2 Lymphoma

Lymphomas refer to solid tumors found in the immune system. Hodgkin lymphomas account for 10% of all lymphomas. Lymphomas are relatively common and most clinicians will have encountered a lymphoma patient regardless of their specialty. Early diagnosis is critical since many lymphomas have excellent, and quite curative, therapies (Pinkerton, 2013). DADS inhibited the activity of telomerase through the transcriptional downregulation of hTERT, the catalytic subunit of telomerase, while keeping the expression of its RNA component unchanged. The suppression of the transcription factors Sp-1 and c-Myc by caspases and the cysteine protease, calpain, led to decreased DNA-binding efficiency at their relative binding sites on the hTERT promoter, culminating in apoptosis via the reduction of telomerase activity. Elevated Mad1 levels generated by DADS treatment may also lead to the creation of additional Max/Mad complexes that may interfere with the Max/Myc complex which binds the E-box of the hTERT promoter, thus transcriptionally decreasing the expression of hTERT (Table 2) (Dasgupta and Sengupta Bandyopadhyay, 2015).

2.5 Lung Cancer

Non-small cell lung cancer (NSCLC) is the single biggest reason for cancer-associated fatalities. Radiotherapy is still the primary treatment for NSCLC. However, ionizing radiation (IR) at low doses can cause invasion and migration (Xu et al., 2021). One study showed that IR significantly boosted A549 cell invasion and migration. A549 cells treated with 40 µM of DADS decreased the IR-induced invasion and migration while improving their radiosensitivity. Furthermore, IR-induced EMT was inhibited by 40 µM of DADS by suppressing the protein matrix, which is related to metalloproteinase-9 (MMP-9) and metalloproteinase-2 (MMP-2) generation, as well as the reduction of the mesenchymal marker N-cadherin and the elevation of the epithelial marker E-cadherin in A549 cells. In addition to this, the expression of Nrf2 signaling was shown to be inhibited by DADS. The IR-induced invasion and migration were suppressed by DADS by inhibiting the activation of Nrf2 signaling in A549 cells (Table 2) (Xu et al., 2021).

The EMT is critical to the process of malignant transformations, and fibronectin (FN), a component of the extracellular matrix, can induce metastasis and invasion. Due to the reduced function of gelatinase, DADS hindered the FN-induced migration and invasion of A549 cells. In DADS-treated A549 cells, cytokeratin-18 and E-cadherin, which are epithelial indicators, were elevated, while vimentin and N-cadherin, which are the mesenchymal markers, as well as factors of transcription, such as twist, snail, and slug, were downregulated. DADS inhibited the FN-induced nuclear translocation of catenin and glycogen synthase kinase-3 phosphorylation in A549 cells, as well as disorganized lymphoid enhancer factor/T-cell factor and homolog 2 activities (Figure 1) (Das and Sinha, 2019).

FIGURE 1

FIGURE 1. The anticancer activity of DADS with respect to colon cancer, esophageal cancer, gastric cancer, and neural cancer.

2.6 Neural Cancer

Neural cancers are a heterogeneous group of over 100 illnesses that cause considerable morbidity and mortality when combined. Glioblastoma multiform (GBM), the most common form of brain tumor, is almost always fatal, with a survival rate (5-year) of only 2%; current treatments only provide palliative relief. GBMs have a high degree of cellular heterogeneity, which may explain why patients’ nodular or regional patterns frequently advance or recur (Figure 1) (Lathia et al., 2011).

Due to its extensive cytoskeletal modification and particularly lethal effect on growing neuroblastoma cells, Aquilano et al. (2010) emphasized the use of DADS in cancer therapy. As the phosphorylation of Tau is strongly associated with the functions of the neuronal cytoskeleton, their investigations found Tau to be a novel target for the anti-cytoskeletal action of DADS and can be used to develop new ways of treating neuronal illnesses linked with Tau phosphatases and the impairment of hyperphosphorylation (Aquilano et al., 2010). DADS has been shown to suppress antiapoptotic factors while simultaneously inherently triggering a caspase cascade as well as activating calpain, resulting in the apoptosis of SH-SY5Y cells (Karmakar et al., 2007). DADS was also found to regulate nNOS, suggesting that nitric oxide plays a significant role in preventing the cytotoxicity caused by reactive oxygen species (Aquilano et al., 2007). DADS exhibited potential anti-glioma properties, especially with regard to their proliferation, while also inducing apoptosis in four distinct types of glioma cell lines that represented the different phases of the illness (Choromanska et al., 2020). DADS caused glioblastoma cells to die by forming ROS, increasing ER stress, lowering ∆Ψm, and activating apoptosis-inducing cysteine proteases and stress kinases (Table 2) (Das et al., 2007).

2.7 Skin Cancer

Skin cancer is a lethal illness and a major public health issue that has resulted in significant economic and human losses across the world (Didona et al., 2018). A variety of internal and environmental variables can aggravate the pathophysiology of skin cancer and worsen the illness (Siegel et al., 2018). The importance of the early identification and diagnosis of skin cancer cannot be overstated. The mortality rate of skin cancer has decreased dramatically because of improved screening procedures, early detection and diagnosis, and innovative treatment modalities (Table 2) (Casari et al., 2018).

The topical application of DADS reduced the prevalence and development of skin cancer in mice models. Shan et al. (2016) revealed that DADS decreased the occurrence and development of skin tumors in mice models in a dose-dependent manner. This mechanism was associated with the upregulation of antioxidant enzyme activity, including catalase, SOD, and glutathione peroxidase, as well as the nuclear accumulation of Nrf2. DADS also enhanced the endogenous link between Nrf2 and p21 and was critical in helping Keap-1 prevent the degradation of Nrf2 (Figure 1) (Shan et al., 2016).

2.8 Prostate Cancer

Prostate cancer is the second most frequent cancer in males after skin cancer, and yet its treatments have the highest success rates. An in vitro experiment was used to study the impact of DADS on growth factor signaling molecules (like insulin) that are involved in the proliferation and survival of the human prostate cancer cells (Arunkumar et al., 2012). It was found that DADS reduces the rate of survival of androgen-independent prostate cancer cells by modulating the expression of the IGF system, resulting in the inhibition of Akt phosphorylation, and consequently inhibiting cell cycle survival and progression by reducing the expression of NF-kB, cyclin D1, and antiapoptotic Bcl-2 molecules while enhancing the expression of proapoptotic signaling molecules (Bax and Bad) which trigger apoptosis (Arunkumar et al., 2012). Shin et al. (2010) investigated the anti-invasive potential of DADS in prostate cancer LNCaP cells; its mechanism involved the tightening of TJs and inhibiting matrix metalloproteinase activities. DADS inhibited the expression of claudin proteins, the important components of TJs, which are crucial for the selectivity and regulation of paracellular transport. In addition, the administration of DADS suppressed the activity of MMP-9 and MMP-2 in LNCaP cells in a dose-dependent manner; this was also associated with a decrease in the expression of proteins and mRNA (Table 2) (Shin et al., 2010).

Chen et al. studied the impacts of DADS on Ca²⁺ viability and mobility in human prostate cancer PC3 cells. 500 μM of DADS caused apoptosis in a mechanism that was independent of Ca²⁺. Annexin V/pi staining revealed that concentrations of both 10 and 500 μM of DADS induced apoptosis. DADS also boosted the formation of ROS. DADS caused an increase in Ca²⁺ in PC3 cells by inducing phospholipase C-independent Ca²⁺ release from the endoplasmic reticulum as well as the influx of Ca²⁺ via phospholipase A2 sensitive channels. In summary, DADS induced Ca²⁺-independent apoptosis, Ca²⁺-dependent cell death, and the generation of ROS (Figure 2) (Chen et al., 2011).

FIGURE 2

FIGURE 2. The anticancer activity of DADS in breast cancer, ovarian cancer, cervical cancer, prostate cancer, leukemia, and lymphoma.

DADS significantly suppressed the development of human prostate cancer DU145 cells by inducing apoptosis. Apoptosis was accompanied by the modulation of Bcl-2 and the inhibitor of apoptosis proteins (IAP) family of proteins, the depolarization of the mitochondrial membrane potential (MMP, ΔΨm), and proteolytic activation of caspases. DADS boosted the expression of Fas ligand (FasL) and death receptor 4 (DR4) proteins while decreasing the number of intact Bid proteins. Furthermore, DADS stimulated the phosphorylation of mitogen-activated protein kinases (MAPKs) such as extracellular-signal regulating kinase (ERK), p38 MAPK, and c-Jun N-terminal kinase (JNK). SP600125, an inhibitor of JNK, greatly inhibited DADS-induced apoptosis, but p38, MAPK (SB203580), and ERK (PD98059) inhibitors did not produce the same effect. DADS-induced apoptosis was followed by the inactivation of phosphatidylinositol 3-kinase (PI3K)/Akt and the inhibition of PI3K. In addition, LY29004 dramatically boosted DADS-induced cell death (Shin et al., 2012).

The growth and progression of breast and prostate cancers have been associated with NF-κB activation. DADS had an IC-50 value of 40 µM whereas MDA-MB-231 and MCF-7 cells had IC-50 values of 6 and 4 µM, respectively. PC3 cells were administered with DADS/quercetin, which significantly reduced the expression of NF-κB, IKKα, and IKKβ. This suggests that DADS or quercetin blocks the expression of nuclear factor kappa-B in androgen-independent prostate cancer cells (Arunakaran et al., 2013).

3 Bioavailability and Pharmacokinetic Profile of Diallyl Disulfide

A comprehensive investigation of DADS pharmacokinetics profiles was conducted by orally administering a 200 mg/kg dose to rats. Allylmethyl sulfide (AMS), allylmercaptan (AM), allyl methyl sulfone, and allyl methyl sulfoxide were recognized as DADS metabolites in the plasma, stomach, urine, and liver of rats (Zhang et al., 2020). When the prepared garlic was consumed, the alliinase enzyme was activated, accelerating the transformation of alliin to allicin, an unstable metabolite. The decomposition of allicin leads to the formation of organic diallyl polysulfides such as diallyl sulfide (DAS) and DADS (Bradley et al., 2016; Yamaguchi and Kumagai, 2019; He et al., 2021). In the human body, DADS degrades quickly, metabolizing into different metabolites, such as diallyl thiosulphinate (DADSO), allylmercaptan (AM), allylmethyl sulfoxide (AMSO), allylmethyl sulfide (AMS), and allylmethyl sulfone (AMSO2). The presence of DADS has been identified in the breath of human subjects following the consumption of garlic. DADS could not be identified in the urine of a volunteer after the oral intake of 1–3 g of garlic powder; this was because DADS cannot easily reach μM-level concentrations in vivo (Alma et al., 2014; He et al., 2021). Similarly, allicin is rapidly removed from circulation after intravenous injections as it is converted into secondary metabolites such as DADS, 2-ethenyl-4H-1,3-dithiin, and E-ajoene (Jacob and Anwar, 2008; Ansary et al., 2020).

For enteric tablets, the allicin, which would eventually metabolized to DADS, various bioavailability were found ranging from 36% to 104%. This was reduced to 22%–57% when consumed with a high-protein meal. Nonenteric tablets gave high bioavailability (80%–111%), while garlic powder capsules gave 26%–109% bioavailability, whatever the meal type is Allicin rapidly disappears from circulation after iv injection, suggesting that it is transformed into secondary products. (Zhang et al., 2020).

Yamaguchi and Kumagai, (2019) found in their animal studies that alliin was absorbed primarily from the intestine via the amino acid transporter for cysteine. The split products of alliin appeared in the circulation 20 min after the administration of alliin by gastric intubation. These investigators concluded that splitting of alliin would take place in the intestinal cells by the action of an alliinase (or C-S-lyase)-like enzyme. The sulfides derived from allicin are known to be absorbed very fast from the intestine, which can be attributed to chemopreventive potential of this molecule (Ariga and Seki, 2006). The bioavailability of OSCs is high in animal subjects treated with aqueous garlic extracts (98% in liver, 103% in blood plasma, and 87% in kidneys for rats, mice, and dogs, respectively). It was estimated that 1 g of ingested garlic will biosynthesize 2.5 mg of allicin, 60 μg of SAC, 1,000 ± 100 μg of DATS, and 570 ± 40 μg of DADS (Gao et al., 2013).

The bioactivity of Allium is mainly attributed to the allyl derivatives that showed in vivo anticarcinogenic activity in various tissues. For instance, in garlic extracts, OSCs are mainly found in allyl and methyl forms (Thompson, 2014; Ramirez et al., 2017). These clearly demonsrates that the significant amount of these molecules can contribute to anticancer properties of DADS.

DADS was determined to have a half-life of less than 1 h in isolated rat livers. Four metabolites of DADS, AMS, AM, AMSO2, and AMSO, were determined to have half-lives (T_1/2) of 6.78, 4.39, 8.64, and 7.16 h, respectively. AMS, AM, AMSO2, and AMSO were found to have the peak concentrations (C_max) of 8, 8, 1,440, and 376 µM, respectively, suggesting that it is possible to achieve effective therapeutic concentrations of these active metabolites. DADS was shown to be quickly absorbed, with the peak concentrations observed 90 min after it was administered. After 2 h, 70% of the radioactivity was still detectable in the cytosol of liver cells, 80% of which was metabolized into sulfides while only 8% as remained as 35S-DADS. Within 2–3 h, DATS, AMDS, DADS, and DAS reached their maxima while the rate of increase of the other compounds was slower (Haina Wang, 2013).

The RBCs of humans convert the organic polysulfides that are derived from garlic into H₂S, an endogenous cardio-protective vascular cell-signaling molecule. Increasing numbers of sulfur-tethering atoms and substituents of allyl accelerate the production of H₂S from the organic polysulfides. Hydropolysulfide (RSnH) is a critical intermediate in the production of H₂S; RSnH is formed when polysulfides that are allyl-substituted undergo nucleophilic substitution at the α-carbon of the allyl substituent. Nucleophilic substitution takes place at the sulfur atom of the organic polysulfides, yielding H₂S and RS_nH. H₂S is also released when the intact aorta rings process the garlic-derived organic polysulfides under physiologically relevant oxygen levels (Benavides et al., 2007).

The behavior of drug release in different pH environments, such as the intracellular lysosome (pH 4.5) and the cellular exterior (pH 7.4), was investigated. The profile of the regulated release of DADS from solid lipid nanoparticles (SNL) was examined. Under these conditions, a greater DADS release rate was observed at lower pHs. Due to the presence of the pair of sulfide groups, DADS acts as both an alkaline and a weak acid and is more soluble at lower pHs. As a result, DADS encapsulated within SLN were more likely to be released at lower pH. Drug release in a more favorable acidic environment would result in a greater rate of release of DADS to the tumor cells; this is especially important in cell lines that are resistant, increasing the therapeutic potential of the delivery system (Talluri et al., 2017; Siddhartha et al., 2018).

4 Clinical Studies

According to the FDA’s proof-based assessment procedure for scientific health appraisal, there is no clear evidence that links garlic to decreased risks of lung, breast, or gastric cancer. (Rivlin, 2009). Even though almost all experiments were observational, the number of investigations that were deemed to be scientifically relevant to this assessment was comparatively small. In addition, the number of subjects involved was relatively small, and no conclusive proof regarding a link between garlic consumption and esophageal, oral, colon, ovarian, prostate, renal, and laryngeal cell cancers has been recorded. Consequently, the relationship between cancer risk reduction and garlic remains unknown (Zuniga et al., 2019). Garlic appears to assist with a wide range of cancer symptoms, including those associated with pancreatic, lung, colon, gastric, colorectal, and breast cancers. In this context, a potential personalized diet with supplementary foods, including beneficial phytochemicals such as allyl sulfur compounds and allicin, could be a potential alleviative treatment. Patients in remission or undergoing therapy have been administered high dosages of allicin antioxidants (Table 3) (Ansary et al., 2020).

TABLE 3

TABLE 3. Clinical studies on garlic constituents in cancer prevention and intervention.

A 6-month eating plan that followed a Mediterranean-style diet was found to increase the intake of anti-inflammatory ingredients such as garlic among the survivors of breast cancer (Zuniga et al., 2019). Another experiment revealed that taking 200 mg capsules or 1 mg of garlic oil twice a day decreased progressive gastric lesions (You et al., 2006). Similar outcomes were observed when the same doses of garlic supplementations were administered over 7.3 years. In addition, long-term garlic intake, such as garlic pills or garlic mixed with vitamins reduced cancer risk (Ma et al., 2012), mortality rate (Li et al., 2019), and precancerous gastric lesions (Gail and You, 2006). A garlic treatment of two capsules twice a day for 7.3 years improved mild folate insufficiency and enhanced serum folate in individuals who were experiencing gastric lesions in rural Chinese communities (Wang et al., 2009). In addition, consuming 3.65 kg of garlic supplements per year for 2 years was linked to a lower incidence of colorectal adenoma, a precursor to colorectal cancer (CRC) (Table 3) (Jin et al., 2013; Gatt et al., 2015; Dreher, 2018; Wu et al., 2019). Several theories have been proposed to explain the chemopreventive benefits of garlic, including the suppression of the formation of DNA adducts, the inhibition of mutagenesis by limiting metabolism, the scavenging of free radicals, or the lowering of cell growth and tumor development (Jin et al., 2013; Charron et al., 2015). In another study, cancer patients were asked to follow either the remission support diet (RD; for the patients in remission) or the treatment support diet (TD; for the patients undergoing chemotherapy) over 3–9 weeks. The diets were low in fat and glucose and high in plant proteins; however, the TD group had an extra 0.5 protein servings. Additional quantities of tomato, rice bran, garlic, kale, pineapples, onion, blueberry, turmeric powder, and/or shiitake were included in daily meals based on clinical studies. The TD had a higher estimated daily consumption of quercetin, plant fat, allicin, onion, protein, and garlic than the RD. Both groups experienced an elevated consumption of vitamin A, C, and E, as well as a decreased consumption of the D-dimer relative to baseline diets. TD showed a greater impulse in cytotoxicity and increased albumin while RD showed reduced D-ROMS (Lee et al., 2015).

5 Conclusion and Future Recommendations

Garlic, a widely consumed spice of the genus Allium, has been found to contain various organosulfur components. DADS has received attention in cancer prevention research as a natural product with potent anticancer properties. This review aims to provide an inclusive evaluation of clinical and preclinical research on the chemopreventive and anticancer effects of DADS. Toxicity and pharmacokinetic investigations of DADS were also included. The potential of this phytochemical as an anti-cancer agent has been supported by many in vitro and in vivo investigations. Pharmacokinetic investigations revealed that this chemical has high bioavailability in a variety of tissues. Injections are the most common delivery method in animal experiments, but clinical experiments have focused on oral ingestion. Future animal studies should more efficiently mimic the conditions of clinical trials conditions to obtain a better understanding of the actual anticancer effectiveness of DADS. The bulk of the literature discussed in this review focuses on preclinical investigations; however, it also covers clinical tests conducted on DADS and its biogenic precursors. These investigations proposed several mechanistic pathways for DADS’ anticancer effects, such as invasion, migration, metastasis, cell cycle arrest, oxidative stress, and cell death. Many in vitro investigations have shown that DADS induces several distinct anticancer activities across a variety of cancer subtypes. More in vivo research is required to provide support for these mechanisms. Garlic was also used in several trials; however, this review recommends concentrating on DADS due to its potency. Pure DADS should be studied in more detail to completely understand its anticancer characteristics, especially since several investigations have proposed conflicting mechanisms. More in vivo studies must be conducted to elucidate the true mechanisms and the target biomolecules of DADS, while also identifying biomarkers that can measure the effectiveness of DADS in anticancer therapy. The literature suggests that DADS could be a promising agent for future natural chemotherapy and that it has significant potential as a safe and efficacious natural remedy to cancer.

Author Contributions

SM, RD, TE, and PW conceptualized and designed the manuscript, participating in drafting the article and/or acquisition of data, and/or analysis and interpretation of data; RL, NE-T, FI, RS, IA, and FN prepared the figures and tables. TE, KC, FA, DC, RC, and PW wrote, edited and revised the manuscript critically. TE and PW revised the final written. All authors critically revised the manuscript concerning intellectual content and approved the final manuscript.

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.

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