The Effect of Aflatoxin Metabolites Concentration in Follicular Fluid on Laboratory and Clinical Outcomes in ICSI

Overview

Mycotoxins are secondary toxic metabolites produced by Aspergillus, Penicillium, and Fusarium species of fungi, when they infect and proliferate on various agricultural commodities either in the field and/or during storage. The well-known detrimental health effects of mycotoxins in humans include liver cancer, Balkan endemic nephropathy, child growth impairment, immune suppression, neural tube defects and death in acute exposure. However, growing evidence also suggests that mycotoxins may negatively influence human fertility.

Aflatoxins (AFs) contaminate different types of food and feed commodities, especially in hot and humid regions of the world . The major AFs are characterized as B1, B2, G1 and G2, among these four, B1 is best known because of its hepatocarcinogenic nature \]. AFs M1 and M2 are produced by biological metabolism of AFB1 and AFB2 from contaminated feed used by animals and excreted in milk and dairy products. Natural occurrence of mycotoxins is present in a large part of the world food supply and bear potential threat to food safety and food security . From global perspective of food safety and food security, mycotoxins contamination of foods has gained much attention as potential health hazards for humans and animals. Studies using animal and cell models indicate that zearalenone, deoxynivalenol, ochratoxin A and aflatoxin B1 can adversely affect fertility, mainly through damage to sex organs, gametes and disruption of steroidogenesis. For instance, animal models have indicated that exposure to the aforementioned mycotoxins can promote adverse effects on spermatozoa, sertoli and Leydig cell function, oocyte maturation, and uterine and ovarian development and function, both in vivo and ex vivo. They may also induce oxidative stress resulting in sperm DNA damage and subsequently, reduced fertilisation rates and lower embryo quality. Furthermore, mycotoxins may act as endocrine disrupters, altering the steroid hormone homeostasis, consequently leading to subfertility or infertility. In humans, zearalenone has been linked to precocious puberty in girls, correlating with extremely high serum oestrogen levels whereas aflatoxin B1 has been linked to poor sperm quality in infertile males. Considering that multiple exposures to these mycotoxins have been reported in humans and that there is a homology in organ systems between animals and humans, these findings may have clinical relevance in human infertility.

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