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BPA-based polycarbonate plastics are exceptionally strong and stable as they can endure exposure to high temperatures and sustain high-impact collisions. The purpose of this review is to investigate current research data on BPA, providing an overview of the findings obtained from studies in animal and human models, as well as on its supposed mechanisms of action. Recently, the chemical compound Bisphenol A (BPA) has drawn attention from the reproductive science community, due to its ubiquitous presence in day-to-day life. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. BPA is now recognized as a potent endocrine disruptor that compromises the HPG axis during foetal and adult life and disturbs the cellular redox balance in testis and sperm, resulting in altered testis development, architecture and function, impaired endocrine function, and abnormal semen parameters.
This study aimed to investigate the effects of BPA on cholesterol levels, lipid droplet accumulation, and testosterone synthesis in TM3 cells and mice via Apolipoprotein A1 (APOA1)-mediated RCT. To investigate the effects of BPA exposure on serum and testicular testosterone synthesis in mice, testosterone levels were measured using ELISA. To investigate the relationship between the inhibition of testosterone synthesis and RCT after BPA exposure, this study detected changes in the mRNA expression of Apoa1, Apoa2, and Apoc3 in TM3 cells exposed to BPA for 24 h, using RT-qPCR.
The diminished sperm count after BPA exposure was confirmed by several other studies in rodents 83,91,94,95,96,97,98,99 and humans 76,100. In mice, males exposed to BPA by oral ingestion presented reduced testes and seminal vesicles weight, with a consequent reduction in sperm count . Moreover, BPA indirectly suppresses the release of LH through aromatase upregulation in testis, blocking testosterone synthesis. LH acts on Leydig cells and FSH on Sertoli cells, stimulating the biosynthesis of testosterone and inhibin B, respectively. All these alterations result in impaired testosterone production, with consequent effects on spermatogenesis 78,79 (Figure 1).
"By the time a woman reaches 40, testosterone blood levels have declined significantly," Dr. Dorr says. Testosterone is a hormone responsible for male sex characteristics, sperm creation, and fertility. By implementing these strategies, you can significantly reduce your daily exposure to BPA and mitigate its potential BPA hormonal effects. This evidence forms a crucial part of a growing body of knowledge concerning BPA's overall BPA hormonal effects, extending beyond just testosterone to other endocrine functions. For women, the implications can include impacts on reproductive cycles, fertility, and even thyroid gland function, contributing to a range of BPA hormonal effects. At MicroplastX, we recognize that simply knowing a chemical exists isn't enough; you need to know precisely where it is to understand potential exposure pathways and how it might contribute to overall BPA hormonal effects.
StAR, a protein responsible for transporting and moving cholesterol into the mitochondria, is among the proteins affected by exposure to BPA and its analogues. The effects of BPA and its analogues on the hypothalamus-pituitary-gonadal axis in male reproductive system. The effects of BPA and its analogues on the correlation between Kiss1, ERα, and GnRH in the brain with the levels of FSH, LH, and testosterone in the plasma is still doubtful. LH in the blood binds to the LH receptor on the LC membrane to stimulate testosterone synthesis . A study by Ullah et al. showed that BPF at a dose of 1 mg/kg/bw via oral gavage significantly reduced the LH and FSH levels in the plasma of male rats.
Plastics are probably one of the biggest reasons behind the fact that our global average on male testosterone levels is so rapidly decreasing. In the first study, which was carried out from our group (138), the exposure of motile spermatozoa to scalar concentrations of BPA (10–800 μM) for 4 h produced a decrease in ΔΨm, starting from 300 μM, which was accompanied by mitochondrial superoxide anion generation, activation of caspase-9 and caspase-3, and motility decrease. Experimental studies suggest that BPA could extend its biological effects on male fertility beyond the disrupting effect on the regulation of spermatogenesis, by directly affecting sperm functions.
In addition several in vitro studies were performed to elucidate the mechanisms through which BPA is able to modify the endocrine response, the effect of steroid hormones as well as spermatogenesis. The toxic effect of BPA on the male reproductive functions is well defined in animals model and demonstrated by physiological changes throughout foetal, pubertal and adult life of male rats (Table 1) 15, 24, 25. Current studies also suggest that early exposures to BPA could lead to late onset modifications that could be inherited throughout generations by epigenetic mechanisms, such as methylation-meditated promoter silencing . Contrary, an another in vitro study, showed that BPA is able to block the androgen receptor-mediated gene expression competing with DHT to bind AR, revealing a significant inhibitory effect on the DHT-induced transcriptional activity . By binding to the GPER receptor, which expression has also been identified in the hypothalamus and pituitary, BPA can induce rapid, non-genomic effects .
This characteristic, called non-monotonic response, complicates the assessment of potential impacts of exposure and makes the use of a dose test to predict low-dose effects inappropriate . Bisphenol A (BPA), a well-known endocrine disruptor present in epoxy resins and polycarbonate plastics, negatively disturbs the male reproductive system affecting male fertility. Despite the fact that many nations have adopted policies to limit exposure to BPA and its analogues in their populations, epidemiological research on humans imply that the same abnormalities seen in experimental studies on animals may be detected. In conclusion, BPA and its analogues may be an additional risk factor to consider because they disrupt the hormonal physiological functions of the male reproductive system. Possible mechanism of BPA and its analogues on the hormonal physiology of male reproductive system. Furthermore, these endocrine disrupting chemicals were also reported to alter the StAR protein, HSD and CYP450 genes and enzymes in the mitochondrial and ER of Leydig cells involved in the steroidogenesis pathway. Figure 1 shows the possible mechanism of BPA and its analogues on the hormonal physiology pathway of the male reproductive system. - http://git.cherrypeng.com/wallacesegal92
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