Flavia Silvia Galli1†
Marta Mollari1†Valentina Tassinari2Cristian Alimonti1Alessandro Ubaldi1
Camilla Cuva1*
Daniele Marcoccia1- 1Istituto Zooprofilattico Sperimentale del Lazio e della Toscana “M. Aleandri”, Rome, Italy
- 2Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy
Glyphosate is a chemical compound derived from glycine, marketed as a broad-spectrum herbicide, and represents one of the most widely used pesticides in the world. For a long time, it was assumed that glyphosate was harmless, either due to its selective enzymatic acting method on plants, and because commercial formulations were believed to contain only inert chemicals. Glyphosate is widely spread in the environment, the general population is daily exposed to it via different routes, including the consumption of both plant, and non-plant based foods. Glyphosate has been detected in high amounts in workers’ urine, but has been detected likewise in bodily fluids, such as blood and maternal milk, and also in 60%–80% of general population, including children. Considering its massive presence, daily exposure to glyphosate could be considered a health risk for humans. Indeed, in 2015, the IARC (International Agency for Research on Cancer) classified glyphosate and its derivatives in Group 2A, as probable human carcinogens. In 2022, nevertheless, EFSA (European Food Safety Authority) stated that the available data did not provide sufficient evidence to prove the mutagenic/carcinogenic effects of glyphosate. Therefore, the European Commission (EC) decided to renew the approval of glyphosate for another 10 years. The purpose of this review is to examine the scientific literature, focusing on potential risks to human health arising from exposure to glyphosate, its metabolites and its commercial products (e.g., Roundup®), with particular regard to its mutagenic and carcinogenic potential and its effects as endocrine disrupter (ED) especially in the human reproductive system.
1 Introduction
Glyphosate (GLY), or N-(phosphonomethyl) glycine, is an organophosphorus compound used as a broad-spectrum non-selective herbicide, considered the most used worldwide (Chaufan et al., 2014; Ferrante et al., 2023). The action of GLY as herbicide is exploited by inhibiting 5-enolpyruvylshikimate-3-phosphate synthase (EPSP), an enzyme generated by plants and microorganisms (Peillex and Pelletier, 2020; Leino et al., 2021). The exertion of this enzyme is achieved by catalysing the condensation reaction between phosphoenolpyruvate and shikimate-3-phosphate (Kanissery et al., 2019; Schwedt et al., 2023). The EPSP inhibition prevents biosynthesis of essential aromatic amino acids (AAAs) such as phenylalanine, tyrosine, and tryptophan), present in chloroplasts and leading to plant deaths (Figure 1). The molecule of GLY was first synthesized in 1950, by the Swiss chemist Henry Martin (Ferrante et al., 2023) and its first authorization dates back to 1974, when Monsanto was granted permission by EPA (Environmental Protection Agency) to market GLY for agricultural use in United State (U.S.), under the trade name Roundup® (Peillex and Pelletier, 2020; Marino et al., 2021). In Europe, the commercialization was only allowed after 2002, following the consent of the European Commission (EC) (Landrigan and Belpoggi, 2018; Marino et al., 2021). The product Roundup® represents the first glyphosate-based herbicide (GBH). The subsequent marketed products such as Glifloglex®, Touchdown® and Glyphogan®, are formulations in which GLY is present in mixture with different adjuvants, used to increase the plants’ penetration of the herbicide and to enhance its activity (Altmanninger et al., 2023). In most commercial formulations, GLY is found in both acid and salt form (e.g., glyphosate potassium, isopropylamine, and diammonium salt). The additional salts have no impact on glyphosate’s activity as herbicide, but are used to modify some important properties such as its stability in formulations and its handling (Travlos et al., 2017; Altmanninger et al., 2023). Nowadays, GLY represents the active component of several formulation GBHs, employed to control more than 100 species of weeds and 60 species of perennial weed plants in industrial and residential settings (Munoz et al., 2021; Ferrante et al., 2023). From 1996 to 2012, the U.S. GLY market reached a record 12 million tons used for weed treatment and, according to sales forecasts, this record will be surpassed in the coming years (Benbrook, 2016; Ferrante et al., 2023). The implication is that GBH products represent, with their use in about 140 countries, one of the most widely used class of plant protection products (PPPs) in worldwide (Munoz et al., 2021). Due to its widespread use, GLY is detectable in several matrices including air, water, and foodstuffs, and consequently, it can also be found in biological fluids such as urine, blood, and maternal milk (Yoshioka et al., 2011; Mária Mörtl et al., 2013; Zouaoui et al., 2013; Mercurio et al., 2014; Simonetti et al., 2015; Steinborn et al., 2016; Demonte et al., 2018; Marino et al., 2021; Munoz et al., 2021; Cellier et al., 2022; Connolly et al., 2022; Iohanna Filippi et al., 2024). In addition, GLY has also been detected in beer and children’s breakfast cereals, indicating that exposure is not only occupational (Jansons et al., 2018; Marino et al., 2021; Munoz et al., 2021; Martins-Gomes et al., 2022; Abrams et al., 2024). GLY is also widely used for the treatment of genetically modified crops (GMO), such as cereals and soybeans (Bukowska et al., 2022). As a result, these plants have developed a resistance to GLY, being able to convert it into aminomethylphosphonic acid (AMPA), which is significantly more mobile in soil than GLY (Annett et al., 2014; Bukowska et al., 2022) and consequently can also be detected in sediment, surface water and groundwater (Battaglin et al., 2014; Grandcoin et al., 2017). Several toxicity studies have highlighted effects of AMPA on human red blood cells and its potential to produce chromosomal abnormalities in fish (Guilherme et al., 2014; Wozniak et al., 2021). For a long time, it was assumed that GLY was harmless, as its target is the enzyme EPSP, which is not naturally present in mammals. Furthermore, it was assumed that GLY was degraded to CO2 and that its formulations contained chemicals erroneously defined as “inert” (Defarge et al., 2018; Munoz et al., 2021; Ferrante et al., 2023). Instead, several epidemiological studies conducted on humans, have revealed a slight increased incidence in the developing of pathologies such as non-Hodgkin’s lymphomas in professionally exposed GLY workers, like farmers (Meloni et al., 2021; Bukowska et al., 2022; Acquavella, 2023; Kim et al., 2023). In addition, several in in vitro studies have indicated that GLY may induce genetic damage, increase oxidative stress, interfere with the estrogen pathway, restrict brain functions, and it has been related to several types of cancer as well (Portier et al., 2016; Nagy et al., 2019; Peillex and Pelletier, 2020; Bukowska et al., 2022). As highlighted, exposure to GLY and its metabolite AMPA, which were found in various crops and food (Vandenberg et al., 2017), could pose a potential risk to human health, due also to the prolonged half-life and long-term environmental contamination of both GLY and AMPA (Battaglin et al., 2014). The aim of this review is to provide an overview about the effects of GLY and its metabolites, with particular regard to their mutagenic/carcinogenic potential and their effects as endocrine disruptors (EDs) in the human reproductive system.
Figure 1. The shikimate pathway in plants. Image has been created with BioRender.com.
2 Glyphosate authorization overview
GLY was first authorised in 1974 in U.S. following the approval of EPA to place GLY on the market as an herbicide (Peillex and Pelletier, 2020; Marino et al., 2021). After its initial authorization, GLY underwent a renewal cycle in which EPA reviewed and re-evaluated the safety and uses of GLY. During approvals process, EPA cooperated with several worldwide organisations including Pest Management Regulatory Agency (PMRA) and EFSA. Throughout each consultation no concern for human health has been identified by regulatory authorities (Brookes et al., 2017). In 2004, FAO (Food and Agriculture Organisation of the United Nations), due to the presumed low GLY concentration in food, its protracted use over time and its chemical and physical properties, set the GLY acceptable daily intake (ADI) without appreciable risk at 1 mg/kg body weight (bw) (WHO/FAO, 2004). In 2015, IARC declared that GLY and its derivatives are probable human carcinogens, classifying these substances into Group 2A. As a result, EPA re-examined GLY’s potential carcinogenicity and carried out a massive revision of the existing GLY cancer database, including epidemiological, animal carcinogenicity and genotoxicity study data. In 2016, the Joint FAO/WHO Meeting on Pesticide Residues (JMPR) took place. During this meeting, the ADI value for GLY and its metabolites was reconfirmed, and it was also decided that an acute reference dose (ARfD) was unnecessary considering the low toxicity of GLY (WHO/FAO, 2016). The meeting concluded that GLY is unlike to pose carcinogenic risk to humans (Williams et al., 2016). In 2022, the U.S. Court of Appeals for the Ninth Circuit invalidated the section on human health of the GLY ID (mid-term registration review decision) and remanded it to EPA for further analysis and explanation, following which EPA concluded that there were no risks of concern to human health from current uses of GLY. In Europe, the commercialization was only allowed after 2002, following the consent of the European Commission (Landrigan and Belpoggi, 2018; Marino et al., 2021) and EFSA. Since its ‘first approval’, GLY underwent its renewal procedures and is currently authorised in Europe until 2033 (Figure 2). In 2014, the EFSA report “Conclusion on the peer review of the pesticide risk assessment of the active substance glyphosate” concluded that GLY did not present genotoxic potential and no evidence of carcinogenicity was observed in rats or mice. Similarly to what occurred in U.S., after the conclusion of IARC on GLY’s potential carcinogenicity, the EC requested to ECHA to carry out further investigations on GLY’s harmful characteristics prior to any decision regarding its potential renewal at European level. In March 2017, ECHA confirmed the absence of evidence to indicate that GLY causes cancer in humans or that it possesses any mutagenic properties. In May 2022, as in 2017, the ECHA’s Committee for Risk Assessment (RAC) concluded that GLY did not meet the scientific criteria to be classified as a carcinogenic, mutagenic or toxic to reproduction and therefore classifying GLY as a carcinogen is not justified (ECHA, 2017). On September 2023 in a letter addressed to Commissioner - EC, 15 European civil society organizations have expressed their concern regarding the observed tumor incidences in GLY exposed animals and the important mechanistic evidence indicating that GLY induces oxidative stress, highlighting how many studies were not taken into account during the renewal of GLY (EuropeanCommission, 2023). Indeed, even if Regulation 1107/2009 stated that peer-reviewed studies must be collected and evaluated by rapporteur member state (RMS) in the dossier submitted in support of regulatory authorisation or renewal of a pesticide, the EC pesticide regulation does not prescribe that all studies must be considered. As a result, many are omitted and priority is given to those conducted by industries. Moreover, also when published non-industry-sponsored studies are included in the dossier they can be dismissed and excluded from the risk assessment according to Organization for Economic Co-operation and Development (OECD) protocols and Good Laboratory Practice (GLP) rules. On one hand industries studies, due to their compliance with OECD protocols and GLP rule, are deemed determined as sufficiently reliable to be used in the risk assessment (Robinson C and Cavoski, 2020), on the other, according to the EFSA guidance document on implementing Regulation 1107/2009, the fact that a study may not be conducted in accordance with Good Laboratory Practice (GLP) does not imply that the study is irrelevant (EFSA, 2011). Despite the above mentioned inconsistencies, further to consultations involving the EU Commission, ECHA, Member States and EFSA, on 28 November 2023, the European Commission adopted the Implementing Regulation to renew the GLY approval for other 10 years.
Figure 2. Regulatory timeline of glyphosate. Image has been created with BioRender.com.
3 Glyphosate mode of action and its physical and chemical properties
GLY is a white, odourless, and crystalline solid classified as an organophosphorus compound. Its simple chemical structure and its remarkable stability under a variety of reaction conditions (e.g., pH, temperature, etc.) has allowed it to be manufactured in different synthesis routes. A frequently adopted synthetic pathways is the one based on the multi-step reaction between glycine, formaldehyde and DMP (dimethyl phosphite) leading to the product GLY with high yields, via several non-isolatable intermediates (Kanissery et al., 2019; Kim et al., 2019; Munoz et al., 2021). Formally can be synthesized by oxidative coupling of the methyl group of methylphosphonic acid with the amine group of glycine (Kanissery et al., 2019; Kim et al., 2019; Munoz et al., 2021). GLY can be considered as a phosphonomethyl derivative of the natural amino acid glycine (Lanzarin Gab et al., 2023). Indeed, GLY is an amphoteric chemical which presents three functional groups characterizing the molecule: carboxylic, amine and phosphonic. As a result, similar to amino acids, GLY is able to form a zwitterionic structure (Fliss et al., 2021). This is reflected in its high polarity and excellent solubility in water and very low lipophilicity (Lanzarin Gab et al., 2023) (Figure 3). Moreover, GLY is photochemically non-degradable, stable in air and is a non-volatile substance undergoing rapid inactivation in soil through adsorption and degradation (John et al., 1988; Kanissery et al., 2019). The mode of action of GLY is to inhibit the activity of the enzyme EPSPS, which is required in the shikimate pathway. Inhibition of EPSPS prevents the synthesis of AAAs such as tyrosine, phenylalanine and alanine in plants, which results in their subsequent death (Kanissery et al., 2019; Marino et al., 2021; Munoz et al., 2021; Ferrante et al., 2023) (Figure 1). GLY appears to be quite resistant to degradation due to the presence of the stable carbon-phosphate bond (Singh et al., 2020). Despite this, GLY can undergo biodegradation through microbial action, both in soil and water, by breaking the carbon-nitrogen (C-N) bond (Noori et al., 2018; Panzacchi et al., 2018). The biodegradation of GLY occurs by action of the enzyme GLY oxidoreductase, through two main metabolic pathways. The first leads to the formation of AMPA (major microbial metabolite) and glyoxylate; the latter causes the conversion of GLY to glycine (Munoz et al., 2021). GLY has a lower toxicity compared to other GBHs, which contain additional ingredients in the commercial formulations in order to modify certain properties of GLY, increasing its penetration into plants and leading to a significant enhancement of GLY’s toxicity (Marino et al., 2021). For instance, Roundup® contains in its formulation numerous co-formulants, one of these is polyetholoxylated tallow amine (POEA) employed as a surfactant in GBHs. In numerous studies, POEA has been shown to be amongst the surfactants that exhibit the greatest toxic effects (Benachour and Seralini, 2009; Peillex and Pelletier, 2020; Miko and Hettyey, 2023). As mentioned above, GLY is an analogue of glycine, which is the simplest among the amino acids. Glycine results to be crucial in synthesis of numerous proteins and exhibits essential singular properties, such as the ability to bind both plasma membrane and cytoskeleton (Perez-Torres et al., 2017). Due to GLY’s structural similarity to glycine, the latter is erroneously misled and substituted with GLY, which is incorporated into peptides in different processes of protein synthesis; leading to numerous damages including hypothyroidism, Alzheimer’s disease and kidney failure (Samsel and Seneff, 2016). However, in a recent work it was demonstrated, through a molecular modelling approach, how GLY is unable to bind to the glyci-tRNA synthetase active site, due to the steric hindrance caused by the phosphate group, that result absent in the glycine (Antoniou et al., 2019). In support of this thesis, in the same paper, a proteomic study was carried out involving mass spectrometry analysis, which enables a distinction between the different molecular weights, and therefore also capable of discriminating if GLY is or not incorporated into proteins. Statistical analysis of the overall proteome shows that there are no substantial differences between GLY-treated and untreated samples, leading to the conclusion that GLY is unlikely to be able to binding to proteins. Therefore, it is clear that there is a controversy in literature regarding the consequences of the chemical similarity of GLY and glycine.
Figure 3. Chemical and physical properties of glyphosate. Image has been created with BioRender.com.
4 Glyphosate and human exposure routes
GLY is able to enter human bodies through different exposure routes, among which the most notable include: dermal absorption, inhalation, ingestion as well as intake of GLY-contaminated foodstuffs (Figure 4). In several studies, it was observed that when GLY reaches the human body, it tends to accumulate in kidneys, liver and colon (Torretta et al., 2018; Marino et al., 2021). The molecule of GLY is eliminated via both urine and faeces, as an unmodified compound in greater quantities in comparison to its main metabolite AMPA (Williams et al., 2000; Panzacchi et al., 2018; Peillex and Pelletier, 2020; Leblanc et al., 2024). In particular, GLY can be found in high amounts in workers’ urine, but it may be detected in other biological fluids, such as breast milk and blood, with an incidence rate in general population of approximately 60%–80%, including children as well, demonstrating how exposure occurs not only from work-related origin (Torretta et al., 2018; Van Bruggen et al., 2018; Connolly et al., 2019). In literature itself there are inconsistencies concerning the routes of exposure of GLY and the resulting impact. Indeed, even if many authors suggest that dermal absorption represents the primary route of GLY human exposure, several in in vivo and in in vitro studies have indicated how skin absorption may be regarded as negligible (Williams et al., 2000; Connolly et al., 2020; Pierce et al., 2020; Sidthilaw et al., 2022). Indeed, several studies conducted on rabbits have indicated how GLY is extremely eye-irritant, but only slightly irritant to skin (Shin et al., 2020; Ferrante et al., 2023). However, several publications have pointed out how GBH products are likely to induce severe chemical burns (Mariager et al., 2013; Shin et al., 2020), and evidence shows that GLY’s epidermic absorption capability is 5x higher if exposed to damaged skin as compared to the healthy (Heu et al., 2012; Shin et al., 2020). Indeed, the only documented death due to skin exposure to GLY involves an 81-year-old Korean man, who did not wash his skin for more than 48 h following the use of an herbicide containing GLY, which had previously caused him severe skin lesions (Shin et al., 2020). Regarding occupational exposure, especially for farmers, the most important route is through the inhalation of GBH products present in aerosol, vapour or dust form (Damalas and Koutroubas, 2016). Further, it has been recently reported that agricultural chemicals, such as GBH, can travel with farm dust into nearby cities, exacerbating the exposure risks (Miousse et al., 2023). Such exposure is particularly harmful, as it could lead to chronic respiratory symptoms and decline of lung function (Tarmure et al., 2020; Pandher et al., 2023). The principal breathing pathology associated with GLY air exposure is a specific atopic asthma, known as ‘wheezing’ (Ye et al., 2013). Furthermore, in other studies it was found that the inhalation of GLY in combination with other substances (Pandher et al., 2021a; b), for example, with lipopolysaccharide (LPS), which is a constituent of the external membrane of Gram-negative bacteria, frequently present in soil and inhalable through dust (Zielen et al., 2015), caused worse human health effects than those triggered by individual exposures. In this regard, attention can be drawn to studies conducted by Pandher and colleagues (Pandher et al., 2021b), showing that the inhalation of air particles made up of both LPS and GLY, caused more serious pulmonary inflammation as compared to inhalation of two individual compounds. Finally, the exposure can also occur through intake of GLY-contaminated foods and this route of exposure became increasingly alarming throughout the years, due to global overuse of GHBs (Myers et al., 2016; Rawat et al., 2023). Indeed, due to its high stability, GLY is able to accumulate both in treated crops and in different environmental compartments, such as soil and water (Martins-Gomes et al., 2022). Therefore, the widespread environment presence of GLY also leads to a diffuse contamination of plant-based foodstuffs (Gillezeau et al., 2019; Narimani and da Silva, 2020). In addition to the above, crops are repeatedly treated with GBHs during each season since such products are actually not only used as herbicides, but also frequently applied as crop-drying agents in cereal harvesting (Van Bruggen et al., 2018; Marino et al., 2021). As a result, GLY is also diffusely detected in foodstuffs like cereals, grains, and fruits (Torretta et al., 2018; Kanissery et al., 2019). Fodder crops are also routinely treated with GLY products. The outcome is that GLY has been found in significant amounts both in the urine of cows and in the meat of cattle (Feltracco et al., 2022). In the available literature data, one of the biggest inconsistencies appears to be that the majority of GLY levels detected in food are below the acceptable thresholds and are scarcely ever detected in milk, meat and fish (Kolakowski et al., 2020; Munoz et al., 2021). Instead, as mentioned above, several studies have actually found that GLY is strongly present in environment and general population is daily exposed to it via several routes, including consumption of plant-based foods. From the foregoing, it can be assumed that daily exposure to this herbicide could be harmful to humans.
Figure 4. Scheme of the main exposure and contamination routes of glyphosate’s and glyphosate-based herbicide’s (GBHs) in humans. Image has been created with BioRender.com.
4.1 Effects of glyphosate exposure on liver, kidney and lungs
Oxidative stress is a phenomenon which causes an alteration in the equilibrium between production of reactive oxygen species (ROS) and organism’s activated anti-oxidant systems. This imbalance may lead to several issues, including damage of lipids and proteins, activation of apoptotic pathways and/or the initiation of inflammatory phenomena in both tissues and cells (Pizzino et al., 2017; Vona et al., 2021). Although natural cellular physiological processes trigger the formation of ROS (Bardaweel et al., 2018), these may also arise through exposure to exogenous substances, including pesticides (Rahal et al., 2014). Oxidative stress has been recognized by IARC as a key factor in carcinogens and in particular, plays a crucial role in the pathogenesis of hematologic cancers (Chang et al., 2023). Several studies demonstrated that GLY has the potential to induce a variety of adverse cellular effects. These include oxidative stress and inflammation in both human cells and in vivo models. Unfortunately, there are only limited research data on human population (Martinez et al., 2020; Chang et al., 2023; Coalova et al., 2023; Makame et al., 2023; Pandher et al., 2023). In a study conducted in vivo, it was demonstrated how administration of sub-lethal concentrations of Roundup®, or as-is GLY, may induce an oxidative stress response (El-Shenawy, 2009). In fact, such administration leads to considerable glutathione (GSH) depletion and the induction of hepatic tissue oxidative stress, mediated by high levels of lipid peroxidation. Additionally, it also causes an increase in both nitric oxide (NO) concentration and tumour necrosis factor α (TNF-α) level, highlighting their action mechanisms as antioxidant agent destroyers (El-Shenawy, 2009). Moreover, in different in vitro studies conducted on human liver cell lines, it was demonstrated that both Roundup® and GLY would induce cytotoxicity, ROS formation, and apoptosis at doses well below the concentrations employed in agricultural applications (Unlu Endirlik et al., 2022; Mehtiyev et al., 2023). Indeed, in the above-mentioned studies, it is shown that ROS formation may cause remarkable modifications in the gene expression of Keap1, L-FABP, Nrf2, HO-1 and HSP70, which are related to the MAPK/ERK pathway (Unlu Endirlik et al., 2022; Mehtiyev et al., 2023). Recent studies have shown that GBHs, as well as GLY alone, may adversely affect kidney functions, resulting in increased blood urea levels (El-Shenawy, 2009; Gunatilake et al., 2019; Kimura et al., 2020). Gunatilahe and colleagues showed that being exposed to contaminated drinking water is associated to high rates of Chronic Kidney Disease of Unknown Origin (CKDu) (Gunatilake et al., 2019). Indeed, GLY has a crucial role in the transport of heavy metals into the kidneys. In farmers occupationally exposed to GLY, the levels of some commonly marker used for the assessment of kidney function have been found altered, amongst which we can mention: urinary neutrophil gelatinase-associated lipocalin (uNGAL), serum creatinine (sCr), urinary microalbumin-to-creatinine ratio (ACR), serum cystatin C (sCys-C), estimated glomerular filtration rate (eGFR), and exposure intensity index (EII) (Mueangkhiao et al., 2020). While, in an in vivo study in rats, in which animals were administered with water containing Roundup® at concentrations of 0.1 ppb (equivalent to 0.05 μg/L GLY), both liver and kidney damage were observed (El-Shenawy, 2009). As a matter of fact, such exposures resulted in anatomical signs of disease and alterations in specific blood and urine parameters, markers of hepatic and renal insufficiency (El-Shenawy, 2009). These alterations were likewise confirmed at molecular level by analysing gene expression profiles in both liver and kidney, exhibiting altered expression patterns, which are typical of dysfunctional mitochondrialas pathologies, such as fibrosis, necrosis, and ischemia (El-Shenawy, 2009). Furthermore, Roundup®, in an in vivo experiment performed at increasing product concentrations (from 5 to 250 mg/kg bw), has also shown detrimental effects on adipose tissue and liver, which can be related to the onset of steatosis and non-alcoholic fatty liver. Indeed, these are the principal organs playing a crucial function in the maintenance of homeostatic energy (Arango Duque and Descoteaux, 2014; Pandey et al., 2019). At the same treatment concentrations, was also observed a significant overexpression of some inflammatory markers’ levels, such as interleukins IL-1β, IL-6, and TNF-α (Pandey et al., 2019; Marino et al., 2021). Work-related GLY exposure may also be regarded as a health risk factor, due to the occurrence of asthma symptoms. Indeed, experiments were conducted in which rats inhaled air samples collected from farms, where GLY was frequently used (Kumar et al., 2014). These studies showed how pulmonary exposure of animals treated with air samples rich in GLY, revealed an increase in eosinophil and neutrophil counts with mast cell degranulation, production of IL-33, thymic stromal lymphopoietin (TSLP), IL-13 and IL-5 (Kumar et al., 2014). In addition, lung inflammatory processes arising from GLY exposure were also observed in Pandher and colleagues in in vivo study (Pandher et al., 2023). In this study, rats were treated with 1 µg doses of GLY and an enhancement of neutrophil count levels, myeloperoxidase, TNF-α, IL-6, KC, ICAM-1 and TLR-2 expression was observed. The increase of inflammatory cytokines, in particularly the cytokine IL-33 and TSLP, intensifies the inflammatory reaction leading to bronchial hyperactivity. This suggests that GLY exposure may cause disruption of the airway epithelial barrier.
4.2 Glyphosate exposure a possible cause of gut disease and microbiotic disruption
GLY can be regarded as a significant environmental factor in the development of diseases associated with dysbiosis of the gut microbiota, like inflammatory bowel disease (IBD) (Chang et al., 2023; Lehman et al., 2023). The status of gut microbiota, which has the function of maintaining intestinal health by promoting digestion, synthesizing vitamins, and supporting the immune system, may be affected by exposure to exogenous chemicals, contributing to the development of various clinical conditions (e.g., Chron’s disease and metabolic disorders) (Mesnage et al., 2019). In fact, the gut represents one of the main barriers for the organism to be exposed to exogenous substances and is specifically vulnerable to exposure to pesticides, including GLY (Abou Diwan et al., 2023). Since the human body naturally does not produce some essential AAAs, such as tryptophan, tyrosine or phenylalanine, these need to be taken from the diet and/or produced by gut microbes (Lopez and Mohiuddin, 2024). Exposure to GLY could leads to an alteration in microbiota structure through interaction with the shikimate pathway, resulting in an inhibition in AAAs production (Mesnage and Antoniou, 2020). Moreover, the GLY disruption of the shikimate route leads to a decrease in plant levels of these nutrients and, as a consequence, in their bioavailability to living beings (Zobiole et al., 2010). As previously outlined, alteration of microbiota could potentially induce various gastrointestinal disorders, including IBD and irritable bowel syndrome (IBS). In addition to the above, a study conducted on rats suggested that exposure to GLY can lead to inflammatory response at small intestine level. Indeed, GLY affected the gut microbial composition of these rats, causing a significant reduction in Lactobacillus (Tang et al., 2020) and also a disruption of intestinal mucosal function, inducing dysbiosis and chronic inflammation (Huang et al., 2020; Fu et al., 2021; Meng et al., 2022). To support the foregoing, an in vivo study concerning inflammatory bowel disease should be mentioned, in which it was reported how GLY exposure would also lead to a significant upregulation of C-type lectin-like receptor 2 (CLEC-2). Such lectin-like receptor, expressed by both immune cells and platelets, is likely to be implicated in cancer development, as well as being related to the increase in enter pathogenic infections (Barnett et al., 2020). In addition, further evidences indicate how the destruction of tight junctions between intestinal and colonic epithelium cells, triggered by GLY exposure, is liable to induce the permeable bowel syndrome (Qiu et al., 2020). Furthermore, the dysbiosis and microbiota imbalance caused by GLY exposure could lead to the initiation of pro-inflammatory cascades in central nervous system (CNS), mediated by lipopolysaccharide (LPS). Through this process, the permeability of the blood brain barrier increases, causing an impairment of specific cognitive functions (Rueda-Ruzafa et al., 2019; Izumi et al., 2024).
4.3 Glyphosate and its possible carcinogenic and/or mutagenic effects
Biotransformation processes undergone by xenobiotics, including GLY, in some cases lead to ROS production, which is liable to cause DNA damage. Such injury has the potential to induce mutations and out-of-control cell proliferation, resulting occasionally in the development of cancer. In recent years, GLY’s potential genotoxic effects became a topic of intense debate, both inside scientific community as well as amongst the various international agencies (Tarazona et al., 2017; Nagy et al., 2019). The scientific divergences behind the debate, may arise both from the use of different data sets, and from dissimilar methodologies for interpreting ambiguous results. For example, the IARC considered sufficient data supplied by case-control researches, unconfirmed by cohort studies, to conclude the evidence of correlation between GLY exposure and non-Hodgkin’s lymphoma. EFSA re-evaluated the same information, giving more weight to the absence of epidemiological studies, considering insufficient for classification (Tarazona et al., 2017). These discussions have become more heated following the decision to renew GLY’s authorization at EU level for another 10 years. The discrepancies observed among the various studies conducted to determine DNA damage caused by GLY exposure, are due to several reasons. The most relevant are related to the different experimental approaches employed and either for the choice of testing GLY at high concentrations and in presence of co-formulants, not considering GLY on its own. In addition, the available studies have been conducted using old GBH formulations, containing the notorious tallow amines. These co-formulants were widely utilized for their efficacy, but exhibited a detrimental toxicological profile (Martens et al., 2019), for which reason they were banned in 2016 at European level. In recent studies conducted in vitro, GLY showed genotoxic effects at both cellular and genomic levels, in several cell lines, but especially in peripheral blood mononuclear cells (PBMCs) (Nagy et al., 2021). Supporting this, in Andreotti and colleagues’ epidemiological study, a correlation was observed between the GLY use and the increased risk of developing acute myeloid leukaemia (AML) (Andreotti et al., 2018). Furthermore, in in vitro studies conducted on human lymphocytes exposed to a GLY concentration of 0.5 μg/mL, corresponding to the EFSA established Acceptable Daily Intake (ADI) (EFSA, 2015), it has been observed how GLY potentially induces DNA damage, including DNA aberrations, chromosome breaks, chromatids, dicentric chromosomes, rings and acentric fragments, and induce micronuclei (MNi). These harms suggest how GLY exposure potentially leads to an increased risk of developing cancer in the exposed people (Santovito et al., 2018; Nagy et al., 2021). The potential genotoxic effect was assessed in vitro, not only by considering GLY, but also evaluating the impacts induced by Roundup® formulation and AMPA metabolite. Findings from these studies indicated that all three compounds might indifferently induce single-strand breaks. Furthermore, it was observed how both GLY and Roundup® under investigation in comet assay, respectively at concentrations of 1,000 and 10 μM, cause similar DNA damage (Wozniak et al., 2018). Such DNA lesions are caused by oxidative stress, triggering the production of 8-oxodG, which can promote incorporation of adenine in place of cytosine, resulting in guanine:cytosine → thymine:adenine mutation (Wozniak et al., 2018). Furthermore, GLY is able to induce changes in DNA methylation. In fact, in PBMCs treated with high concentrations of GLY (from 10 to 100 μM), a state of DNA hypo methylation was found, whereas in particular at lower concentrations (0.5 μM) GLY is able to induce an induced in hypo-methylation promoter of P21 and a hyper-methylation promoter of TP53, which are involved in the activation of apoptotic pathways (Wozniak et al., 2020). Alterations in methylation, both at the general level and in promoter regions of genes involved in various cellular processes, are recognized as likely responsible for the enhanced risk of cancer development (Ehrlich, 2019; Wozniak et al., 2020). From the above, it is possible to conclude that GLY may induce epigenetic alterations that can disrupt the normal methylation processes and gene expression in human PBMCs, resulting in cellular transformation. Due to such scientific evidence, IARC concluded that an association between GLY exposure and the development of non-Hodgkin’s lymphoma is possible (IARC, 2017). The Genotoxic effects of GLY and GHBs were also observed in human liver cells (HepG2). In Gasnier et al. (2009), human liver cell lines were treated with both GLY and also with different Roundup® formulations containing increasing amounts of active ingredient (from 7.2 to 450 g/L) that induced both DNA damage and anti-estrogenic activity on estrogen nuclear receptors (nERs), ERα and ERβ. Similar results were also obtained in a research conducted on the human buccal epithelial cell line (TR146) demonstrating, by comet assay, how GLY is able to cause DNA damage resulting in probable single-strand breaks, apurinic sites, MNi and nuclease buds (NB) (Koller et al., 2012). In addition, both GLYs and GBHs have been found to promote the maintenance of tumour environment leading to the development of resistance to chemotherapeutics employed in treatment of certain cancer forms. For example, in human glioblastoma cell lines, it was observed an enhancement of all biomarkers (GST, P-gp/ABC, and MRP) involved in the mechanism of multidrug resistance (MDR); that promoting oxidative stress and an increased resistance to apoptosis (Doganlar et al., 2020).
4.4 Estrogenic effects of glyphosate and glyphosate-based herbicides
Several studies have demonstrated how both GLYs and GBHs can be regarded as endocrine disruptors (EDs), as they are able to induce estrogenic or androgenic nuclear receptors-mediated effects (Mesnage et al., 2017; Munoz et al., 2021). In a research study conducted in vitro on T47D hormone-dependent and MDA-MB231 hormone-independent human breast carcinoma cell lines, it was demonstrated how GLY exposure possibly induces estrogen-responsive element (ERE) transcriptional activity, with consequent induction of cell proliferation in hormone-dependent carcinoma lines. By contrast, in hormone-independent cells the same activity was not observed (Thongprakaisang et al., 2013). The same authors also demonstrated that the GLY proliferative effect is nullified following exposure to an ER inhibitor drug (ICI 182780), confirming the estrogenic GLY activity (Thongprakaisang et al., 2013). In recent in vitro experiments carried out in human endometrial (nERs-positive) and breast cancer (nERs-negative) cell lines, genotoxic effects induced by GLY have been observed in relatively low concentrations (75–500 μg/mL) and after short-time treatment. It is interesting to highlight, how toxic effects have been observed on both cell lines, but with a greater influence on the ER-positive endometrial lines. Therefore, from the above findings, it can be shown that genotoxic effects caused by both GLYs and GBHs, can also be attributed to nERs status (De Almeida et al., 2018). Indeed, as the breast cancer lines are hormone-independent, they express low levels of nERs. Consequently, in order for GLY to exert its effect, it should act through non-estrogenic mechanisms. As the interaction between nERα and GLY has proven to be weak, the genetic activation is plausibly mediated by a non-binding mechanism (Mesnage et al., 2017). In a recent work involving the Ishikawa cell line derived from human endometrial carcinoma, GLY was shown to induce E2 (17β-estradiol)-like effects on the epithelial-mesenchymal transition process. These influences are manifested through promoting the migration and cell invasion, and by down regulating of E-cadherin mRNA expression, in a similar mode as occurs with E2. This behavior has been reversed following treatment with the drug ICI 182780 (Gastiazoro et al., 2020). Hence, there is evidence from these studies that both GLY and GBHs, exhibit estrogenic properties, although these are milder than the ones observed in E2. However, data in the literature are lacking, so further research is needed to compare the estrogenic potency of GLY and GHBs with those of E2 and other estrogen-like EDs, such as phthalates. Additionally, GBHs has been shown to reduce aromatase enzyme activity in human placental cells (JEG3) by decreasing its gene expression. This process occurs at concentrations below of those employed for agricultural purposes (Richard et al., 2005). During the same research over mentioned, this inhibiting effect of the aromatase enzyme, triggered by both GLY and GHBs, was also observed in equine and human testicular microsomes, proving an interaction with the purified enzyme’s active site (Richard et al., 2005). The before-mentioned data are corroborated in a study conducted by Benachour et al. (2007) which revealed that both GBHs and GLY are able to inhibit the activity of the enzyme in both HEK 293 and JEG3 cells, which are derived from human placenta or its extracts, as well as from mammalian testis. In spite of the fact that the GBHs represent the most widely used pesticides worldwide, relatively few human epidemiological studies concerning fertility are available. In a Canadian study in Ontario population, it was found that pre-conception GLY exposure, could be responsible for increased risk of later miscarriage (Arbuckle et al., 2001). While, in another more recent research, conducted on a U.S. Indiana cohort, it is reported that urinary levels showing higher GLY concentration, might be associated to a shorter gestation period (Parvez et al., 2018). Finally, in a Thailand study, high GLY levels were detected in fetal and maternal serum of gestating women, engaged in agricultural labor or living in farming households (Kongtip et al., 2017). However, additional epidemiological investigations are necessary to provide further understanding of potential adverse fertility effects induced by GLY and GBHs. In contrast, several existing animal studies are available demonstrating the harmful effects of GLY and GBHs on the reproductive health at environmentally relevant doses. Among the worst effects, we can cite embryos loss prior to and post-implantation, delay in growth, as well as congenital abnormalities (Milesi et al., 2018; Milesi et al., 2019; Pham et al., 2019; Milesi et al., 2021).
5 Conclusion
The exposure to pesticides is well known to cause serious damage to both environment and human health. Several scientific studies demonstrated how being exposed to GLY and GBHs, may lead to the occurrence of various conditions in humans, like the onset of inflammatory diseases, neurological disorders and reproductive disruptions (Corti et al., 2022; Tassinari et al., 2023). The molecular mechanisms causing these observed effects are not completely understood. Part of the origin of these detrimental effects, could be associated with the structural similarity of GLY to glycine, which is confused and substituted with GLY in different processes of protein synthesis, causing both neurotoxic and cytotoxic effects. However, a discordance among the literature data exists, as it was also demonstrated through molecular modelling approach and proteomic analysis, that GLY is unlikely to bind proteins, due to its steric hindrance. These discordances suggest that the consequences of GLY’s similarity to glycine are still an open issue. This process is just one of many that would explain the harmful impacts caused by GLY. Indeed, both regulatory agencies and scientists differ in their opinions concerning the assessment of the health risks induced by GLY and GBHs exposure. Recently, at EU level, the use of GLY has been renewed for another 10 years, despite evidence of genotoxic and mutagenic effects from several in vitro studies. These experiments have been conducted either with high doses of glyphosate as well as in presence of co-formulants (e.g., tallow amines), which are considered by the competent authorities to be the most responsible for the negative human health effects caused by GHBs. In order to exclude the potential carcinogenic and genotoxic effects of GLY, the studies should be conducted by using glyphosate alone rather than in formulation and in concentrations below, or equivalent, to the exposure doses considered safe for human health. Additionally, genotoxicity tests should be performed in in vivo studies with low doses active substance alone. Therefore, the negative human health aspects arising from GLY exposure, still remains an open topic to be investigated, particularly considering the recent European-level renewal of the active substance for another 10 years.
Author contributions
FG: Conceptualization, Supervision, Writing–original draft, Writing–review and editing. MM: Writing–review and editing. VT: Conceptualization, Supervision, Writing–original draft, Writing–review and editing. CA: Data curation, Writing–review and editing. AU: Conceptualization, Funding acquisition, Resources, Supervision, Writing–original draft, Writing–review and editing. CC: Conceptualization, Supervision, Writing–original draft, Writing–review and editing. DM: Conceptualization, Supervision, Writing–original draft, 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 study was supported by Italian Ministry of Health in framework of project “Valutazione dell’impatto derivante dall’impiego dei prodotti biocidi e relativa diffusione per uso consapevole e sostenibile - Research Code MSB123”. The funding bodie did not have any role in the design of the study, analysis and interpretation of data, and in writing the 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
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Keywords: glyphosate, plant protection products, mutagenic, cancer, human health and reproduction
Citation: Galli FS, Mollari M, Tassinari V, Alimonti C, Ubaldi A, Cuva C and Marcoccia D (2024) Overview of human health effects related to glyphosate exposure. Front. Toxicol. 6:1474792. doi: 10.3389/ftox.2024.1474792
Received: 05 August 2024; Accepted: 06 September 2024;
Published: 18 September 2024.
Edited by:
Gunnar Boysen, University of Arkansas for Medical Sciences, United StatesReviewed by:
Sarah Shuck, City of Hope National Medical Center, United StatesLuke Erber, University of Kansas, United States
Copyright © 2024 Galli, Mollari, Tassinari, Alimonti, Ubaldi, Cuva and Marcoccia. 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: Camilla Cuva, camilla.cuva@izslt.it
†These authors have contributed equally to this work