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Mouanness, M.; , . Impact of Dietary AGEs on Female Reproduction. Encyclopedia. Available online: https://encyclopedia.pub/entry/22123 (accessed on 13 April 2024).
Mouanness M,  . Impact of Dietary AGEs on Female Reproduction. Encyclopedia. Available at: https://encyclopedia.pub/entry/22123. Accessed April 13, 2024.
Mouanness, Marco, . "Impact of Dietary AGEs on Female Reproduction" Encyclopedia, https://encyclopedia.pub/entry/22123 (accessed April 13, 2024).
Mouanness, M., & , . (2022, April 21). Impact of Dietary AGEs on Female Reproduction. In Encyclopedia. https://encyclopedia.pub/entry/22123
Mouanness, Marco and . "Impact of Dietary AGEs on Female Reproduction." Encyclopedia. Web. 21 April, 2022.
Impact of Dietary AGEs on Female Reproduction
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Advanced glycation end products (AGEs), a heterogenous group of products formed by the reaction between protein and reducing sugars, can form endogenously due to non-enzymatic reactions or by exogenous sources such as diet where considerable increase in AGEs is observed due to the modification of food mainly by thermal processing. Recent studies have suggested that AGEs could impact, via inducing inflammation and oxidative stress, the reproductive health and fertility in both males and females.

advanced glycation end product infertility PCOS

1. Introduction

The Maillard reaction was first reported in 1912 by French scientist Louis Camille Maillard [1][2] and is defined as the chemical reaction in which the carbonyl group of carbohydrates reacts non-enzymatically with primary amino groups of proteins [3][4]. This reaction leads to the formation of advanced glycation end-products (AGEs). The early stages of the Maillard reaction lead to the formation of chemically reversible glycosylation products with proteins called Schiff bases and Amadori adducts [5]. The late stages of this glycation reaction forms complex glycation products which are the AGEs [6] (Figure 1). Since the 1980s, AGEs have been shown in several studies to be implicated in many health complications such as diabetes and aging [7], as well as many inflammatory diseases, obesity, cardiovascular diseases (CVD), metabolic syndrome and neurodegenerative disorders [8][9][10][11][12]. In the last decade, several studies have shown a potentially significant impact of AGEs on reproductive health in both males and females. This research will summarize the different types of AGEs and their receptors as well as the effect of dietary AGEs on female reproduction, in particular ovarian function, polycystic ovary syndrome (PCOS), and perinatally in utero on the female offspring reproduction. It also addresses the possible mechanistic pathways by which dietary AGEs alter female reproductive health.
Figure 1. Overview of the formation of advanced glycation end products (AGEs) [1][2][3][4][5][6]. N-carboxymethyl-lysine (CML).

1.1. What Are AGEs? How Do They Form?

AGEs are stable non-enzymatically catalyzed compounds which are formed by condensation of the amino groups of protein, lipid, amino acid and nucleic acid with the aldehyde group of reducing carbohydrate [13]. This nonenzymatic modification of proteins, lipids, and nucleic acids by glucose is one of the most important post-translational modifications in the formation of AGEs [14][15]. Once formed, the products of advanced glycation result in an irreversible cross-linking of proteins, loss of protein structure and function, followed by apoptosis and damage to cellular structures [14][15]. AGEs constitute a heterogeneous group of compounds of more than 20 members such as N-carboxymethyl-lysine (CML), pentosidine, 1,2-dicarbonyl precursor compounds glyoxal, and methylglyoxal. Pentosidine and CML are the most commonly studied AGEs [16][17] and have been used as markers of dietary AGE’s accumulation in various tissues [16][18][19][20][21][22]. Some of these compounds are fluorescent crosslinking (such as pentosidine [23]) products while others are non-fluorescent and/or non-crosslinking (such as CML [24][25]).
AGEs can be formed either endogenously by the body or from exogenous sources [1]. Endogenous AGEs are normally formed by glycosylation in different tissues of the body, occur slowly, increase progressively with aging and even faster with abnormal medical health conditions such as hyperglycemia and several chronic degenerative diseases [26]. Exogenous AGEs are obtained from food consumption and they are in very high levels in unhealthy food that is cooked at high temperature, such frying [27] and from smoking [28]. Contemporary methods of cooking (precooked fast-food meals), food high in protein and fat such as meat, cheese, and egg yolk dramatically increase serum AGEs’ concentration [27][29]. In addition to serum level, tissue AGEs can be influenced by diet as well [16][27]. Even though it is beyond the scope of the article, smoking has been identified as an exogenous source of AGEs [30]. Glycation products are present in tobacco and smoke in a form that can rapidly react with proteins to form AGEs [30].

1.2. How Do Dietary AGEs Act?

Dietary AGEs bind to several types of receptors (Figure 2). First, AGEs can act by binding to a receptor called RAGE (Receptor for Advanced Glycation End product) which is member of the immunoglobulin superfamily [31]. The expression of the RAGE protein is detected in human trophoblasts in chorionic villi early in fetal life (such as in endothelial cells of embryonic vessels and alveolar capillaries) and gradually increases after birth and in adulthood [32][33].
Figure 2. Receptor for Advanced Glycation End (RAGE) products and its mechanism of action. RAGE consists of transmembrane, cytosolic and extracellular domains. The extracellular domain consists of V, C1, and C2 domains. The soluble fragment of RAGE (sRAGE) is produced by hydrolysis of the RAGE receptor and contains the RAGE’s extracellular domain only. The binding of AGEs to RAGE induces a series of inflammatory and apoptotic responses intracellularly and contributes to metabolic dysfunction [32][33][34][35][36][37][38][39][40]. Mitogen-activated protein kinase (MAPK), extracellular signal-regulated kinase1/2 (ERK1/2), protein kinase C (PKC) and nuclear factor kappa B (NF-κB), lysyl oxidase (LOX), tumor necrosis factor (TNF-α), interleukin-1 (IL-1), vascular adhesion molecule-1 (VCAM-1), and interleukin-6 (IL-6).
RAGE has a triple domain: transmembrane, a cytosolic and an extracellular [34], is expressed in cell membranes of several tissues such as heart, lung, skeletal muscle, the vessel wall and the reproductive system [10][34][41] and can be activated by many other ligands including amyloid β peptide, high-mobility group protein B1 (HMGB1) and the S100 group of protein [42].
After binding to RAGE, there is an activation of several intracellular inflammatory signaling pathways that include mitogen-activated protein kinase (MAPK), extracellular signal-regulated kinase1/2 (ERK1/2), protein kinase C (PKC) and nuclear factor kappa B (NF-κB) [43][44]. The activation of those pathways can lead to inflammatory state, cellular oxidative stress, and cellular damage [31] via upregulating markers of reactive oxygen species (ROS), and inflammatory molecules such as tumor necrosis factor (TNF-α), interleukin-1 (IL-1), vascular adhesion molecule-1 (VCAM-1), and interleukin-6 (IL-6) [45]. Interestingly, the binding of AGEs to RAGE upregulates RAGE expression itself, causing inflammation to get worse [31][46][47][48].
Second, RAGEs have been found to have multiple soluble forms detected mainly in body fluids and blood. The two most common forms are: sRAGE (soluble fragment of RAGE) and esRAGE (endogenous secretory RAGE). The sRAGE is produced by hydrolysis (MMPs and ADAM-10 induced proteolytic cleavage mechanisms [35][49]) of the RAGE receptor at the level of the cell surface and can be detected in the blood and bodily fluids [36][48]. Unlike RAGE, sRAGE contains only the extracellular domain of RAGE [36][48], and unlike RAGE, it has an “anti-inflammatory” action since it holds on to the circulating AGEs, thus inhibiting them from exercising their pro-inflammatory effect by binding to RAGE [37][38][39]. Unlike sRAGE, which is derived from the full-length form of RAGE [49], esRAGE is only derived from a part of the RAGE, specifically from pre-mRNA alternative splicing [40]. The esRAGE, also called variant RAGE-v1, usually comprises 20% of the total soluble RAGE receptors [40].

1.3. How Are Dietary AGEs Cleared from the Body?

Dietary AGEs are orally absorbed [50], with approximately 10% of them being absorbed in the GI tract and delivered to the liver and to other organs including but not limited to the reproductive system [51]. Dietary AGEs are mainly cleared by the urinary tract system (kidneys): nearly a third of dietary AGEs are excreted in the urine, with approximately 50% of the AGEs remaining quantified in the urine until approximately a few days following its consumption [52], and accumulating in the body leading to inflammation and oxidative stress [51]. The beginning of AGEs’ degradation occurs mainly intracellularly, therefore they first need to be inserted into the cell. Some of the AGE-receptors that are involved in the detoxification process are the AGE-R1/OST-48, AGE-R3/galectin-3 and scavenger-receptors [53]. These receptors compete with RAGE and try to bind the circulating dietary AGEs, thus they inhibit the toxic RAGE-mediated signaling pathways. The uptake of AGEs takes place through the activation of membrane receptors via phosphorylation or ubiquitinylation of the cytoplasmic side of the receptor, thus inducing its endocytosis [54].

2. Polycystic Ovary Syndrome (PCOS) and Dietary AGEs

PCOS is arguably the most common endocrinopathy in reproductive-aged women [55][56]. It is associated with significant metabolic changes and reproductive alterations, making it the most common cause (up to 70%) of anovulation [56]. Most women with PCOS display some type of metabolic dysfunction [57]. Studies have shown that women with PCOS have elevated circulating AGEs, which is exacerbated by exogenous absorption of AGEs from western heat processed diets [58]. AGEs contribute to the pathogenesis of PCOS as well as the consequential metabolic and reproductive system effects as proven by several in vitro experiments, animal models, and human studies [9][48][59][60][61][62].
When quantified at the ovarian tissue level by immunohistochemistry, RAGE and AGE-modified proteins are expressed in women with or without PCOS, though at much different concentrations [9]. There are alterations in the AGE system that have been shown to be related to reproductive impairment in women with PCOS [63]. It was first demonstrated in 2005 that overweight women with PCOS, compared to those without PCOS and independently of the hyperglycemia level (well known to be correlated to an increase in AGEs level), have increased AGEs’ levels and the upregulation of monocyte RAGE expression [48]. Then, in 2008, it was shown that lean women with PCOS without insulin resistance (another factor that is well known to be correlated with elevated body AGEs) also have elevated serum AGE levels compared to women with components of PCOS only (such as hyperandrogenemia with or without PCO-ovarian morphology) [59]. These findings suggest that these harmful molecules and the pro-inflammatory multi-ligand receptor RAGE have a pathological significance in reproductive abnormalities, in particular in ovarian dysfunction, in PCOS. Additionally, several studies in women who underwent IVF, assessed the relationship between sRAGE and PCOS and showed that compared to women without PCOS, those with PCOS had significantly lower sRAGE levels in the follicular fluid [64][65][66][67]. These findings suggest that there are alterations even in the anti-inflammatory sRAGE receptors in women with PCOS.
Other studies have demonstrated that women with PCOS given isocaloric diets high in AGEs for 2 months had significantly higher testosterone, free androgen index, and androstendione levels compared to women with PCOS on two-months low-AGE isocaloric diet [29]. Animal studies in animals confirmed the same findings, where rats put on a high-AGE diet for six months showed elevated AGE deposition in the reproductive system (theca cells), increased RAGE staining in granulosa cells, and higher plasma testosterone levels compared to low-AGE diet rats [16]. In another study, high-AGE diet showed increased plasma testosterone and decreased plasma estradiol and progesterone in female rats compared to their female rats counterparts on low-AGE diets [68]. This underscores an irrefutable correlation between dietary AGEs and hyperandrogenemia, solidifying the hypothesis that lowering dietary AGEs in PCOS could reduce some of the symptomatology of hyperandrogenemia. 

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