commit 81bb551f25f073a218e9b99cfbef55ab5068fbd0 Author: nannieunderhil Date: Thu Apr 2 21:41:19 2026 +0800 Add BPA Exposure Linked to Lower Testosterone Levels in American Men: TDS Implications diff --git a/BPA-Exposure-Linked-to-Lower-Testosterone-Levels-in-American-Men%3A-TDS-Implications.md b/BPA-Exposure-Linked-to-Lower-Testosterone-Levels-in-American-Men%3A-TDS-Implications.md new file mode 100644 index 0000000..bd98d81 --- /dev/null +++ b/BPA-Exposure-Linked-to-Lower-Testosterone-Levels-in-American-Men%3A-TDS-Implications.md @@ -0,0 +1,8 @@ +
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BPA and its analogues have a negative impact on hormonal physiological functions in the male reproductive system, which have been proven in vitro 55,78,79, in animals 56,64,65,66,67,68,69,70,72,74,75,76,77,80 and in human studies 108,109,110,111,116,118. Numerous studies, both epidemiological and experimental, published in recent years have contributed to our understanding of some of the features and how they influence the hormonal physiological functions in the male reproductive system. The summary of human epidemiological studies of BPA and its analogues towards male reproductive system. Table 4 summarises human epidemiological studies of BPA and its analogues towards the male reproductive system. +BPA also causes sperm damage by suppressing the antioxidant system and subsequently increasing oxidative stress. BPA can also bind to G-protein-coupled estrogen, gamma peroxisome proliferator-activated, and orphan nuclear estrogen gamma receptors, thereby leading to major cellular and endocrine disruptions. Due to its structural similarity to 17 beta-estradiol, BPA can bind to alpha and beta estrogen receptors to trigger estrogenic effects. Free or unconjugated BPA is considered the active form with harmful endocrine disrupting effects. As a result, these chemicals can have potentially damaging effects on the development, reproduction, neurological, cardiovascular, immune, and metabolism systems in both humans and animals. These substances are capable of interfering with the biosynthesis, secretion, transportation, binding, or removal of endogenous hormones. In a recent review published in International Journal of Molecular Sciences, scientists discuss the effect of bisphenol A (BPA) on human male fertility. +This backdoor pathway is also known as the alternative pathway in testicular steroidogenesis involving the activation of p450 aromatase. Furthermore, BPF and BPAF also decreased the gene expression of HSD3β2 and CYP17A1 in the human adrenocortical carcinoma cell line . The CYP17A1 and 3β-HSD gene expression involved in the steroidogenic enzyme cascade in the endoplasmic reticulum also decreased in BPA-intoxicated rats . Furthermore, BPA analogues such as BPF, BPAF, and BPS also caused a decrease in the expression of StAR mRNA. +These analogues may demonstrate the same adverse effects as BPA on the male reproductive system; however, toxicological data explaining the male reproductive hormones’ physiological functions are still limited. However, whether similar effects would be seen in the general population at lower exposure levels is not known, and need to be studied further. It’s okay for testosterone levels to fluctuate for women in different stages of life. To measure [buy testosterone cream online](https://directorio.restaurantesdeperu.com/employer/surgeon-led-clinic-istanbul-2026-sule-clinic/) levels, a woman can have a [buy testosterone cypionate](https://2workinoz.com.au/employers/effects-of-testosterone-on-muscarinic-acetylcholine-receptors-in-the-rat-epididymis/) blood test ordered by a healthcare provider, such as a primary care physician, OB-GYN, or endocrinologist. While testosterone replacement therapy may provide better results in improving testosterone levels, some may want to know how to treat low testosterone in a woman naturally. +Noteworthy, Li et al. (112) assessed the relationship between urinary BPA levels and semen parameters among 218 factory Chinese workers with or without occupational exposure to BPA. In the Study for Future Families (SFF), the only one enrolling men with proven fertility (315 male partners of pregnant women), regression models revealed no relationship between urinary BPA levels and semen parameters (122). Finally, in a recent report on a preconception cohort of 161 men without known subfertility, higher urinary BPA concentrations were found in the group of men with abnormal sperm tail morphology, whereas no association was found with sperm count, and no information was provided about other semen parameters (121). +Testosterone therapy suppresses sperm production, [git.ibossay.com](http://git.ibossay.com:3000/elaineanderson) sometimes to zero, within months. Expect sexual benefits within weeks, energy and mood within 1–2 months, and body composition changes over 3–6 months alongside resistance training and protein intake. Intranasal [buy testosterone online no prescription](http://218.201.98.56:18106/roxannesandber) (3 times daily) avoids transfer risk and allows quick on/off.. The evident divergence and, sometimes, opposed association between steroids and BPA in both fluids plasma and seminal suggests that their composition is significantly different . On the other hand, BPA in men with impaired fertility appears to alter hormones levels with detriment of semen parameters. No significant associations were found between any semen parameters and urinary BPA concentration .|In particular, male mice exposed [best place to buy testosterone](http://43.136.59.253:3033/rustyengel3917) BPA during the preimplantation period (days 1–5 of gestation), showed a reduction of serum and testicular testosterone levels when euthanized at 24 postnatal days and an increase of GnRH mRNA at 35 and 50 postnatal days . This type of studies may be interesting to study the immediate effects of an acute exposure to high levels of BPA; however, whether the concentration and the exposure time used demonstrate what happens at the physiological level and have biological relevance remains questionable. The in vitro exposure of Acipenser ruthenus spermatozoa to concentrations of BPA possibly occurring in nature (0.5–10 µg/kg) resulted in a significant reduction in sperm motility and velocity and an increase in DNA fragmentation, together with higher levels of protein and lipid oxidation and increased SOD activity .|For more than three decades, NIEHS has been a pioneer in conducting research on the health effects of endocrine disruptors. This observation leads scientists to think that endocrine-disrupting chemical exposures, even at low amounts, can alter the body’s sensitive systems and lead to health problems. If a woman has symptoms of high or low testosterone, it’s recommended that she visit a healthcare provider to get further testing and a diagnosis.|22-hydroxycholesterol and filipin III were obtained from Cayman Chemical (Ann Arbor, MI, USA). Testosterone, HDL cholesterol, and total cholesterol (TC) assay kits were obtained from Jiancheng (Nanjing, China). This spherical form is then acted upon by several proteins in plasma that alter its composition and size. Disruption of cellular cholesterol homeostasis can lead to a variety of pathological conditions, including atherosclerosis and Tangier’s disease (28). APOC3 inhibits the catabolism of triacylglycerols (TAG) from chylomicrons and very low-density lipoprotein by lipoprotein lipase and inhibits the hepatic uptake of residual lipoproteins.|Moreover, exogenous supplement of 22-hydoxycholesterol (22-OH-Chol) were used to uncover the mechanisms by which BPA increases APOA1-mediated RCT led to inhibition of testosterone synthesis in TM3 cells in the presence of BPA. Therefore, investigating the decrease in testosterone synthesis in Leydig cells from the perspective of cholesterol is advantageous. However, few studies have investigated whether BPA regulates testosterone synthesis in mouse testes by enhancing reverse cholesterol transport (RCT). This cholesterol reduction likely led to testosterone synthesis disorders in the model, indicating that BPA inhibits testosterone synthesis in mice by disrupting cholesterol transport. It was observed that serum and testicular [buy testosterone gel](http://gogs.zlhuiyun.com/merrybuttensha) levels were drastically reduced in BPA-treated mice. Regarding maternal BPA exposure and male reproductive function, a weak association of prenatal BPA exposure with sperm quality and testicular functions has been observed in men later in life. BPA affects the human male reproductive system by disrupting the hypothalamic-pituitary-testicular axis and altering the expression and activity of enzymes related to testicular steroidogenesis and spermatogenesis.} +
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