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Bisphenol A decreases expression of Insulin-like factor 3 and induces histopathological changes in the Testes of Rats
Leman Sencar1, Gulfidan Coskun1, Dilek Şaker1
1Department of Histology and Embryology, Faculty of Medicine, Cukurova University, Adana, Turkey.
Abstract:
Bisphenol A (BPA) is a chemical agent known to have detrimental reproductive and developmental effects. The tissue-specific impacts of BPA exposures and target tissues sensitiveness to BPA are still unclear. The aim of this study was to determine the short- and long-term dose-dependent toxic effects of BPA on rat testes. Forty-eight Wistar albino male rats were divided into four groups each containing 12 rats. To induce toxicity, BPA was administered orally at three different dosages (50, 100, and 200 mg/kg) for 14 and 28 days, respectively. Testis tissues were examined using light and electron microscopy, immunohistochemistry, and biochemical methods. Serum testosterone (T) and luteinizing hormone (LH) levels were measured. Additionally, insulin-like factor 3 (INSL3) as a marker of Leydig cell function was evaluated immunohistochemically. Groups administered high doses of BPA showed severe degenerations such as testicular atrophy, spermatogenic arrest, and interstitial edema in testis. Also, a significant decrease in INSL3 immunoreactivity and serum LH and T levels was found. The results indicated that both increased exposure time and dosage of BPA caused more serious detrimental effects on testes in the rat. Decreased INSL3 and T levels was evidence of Leydig cell function impairment due to BPA.
Insights
Bisphenol A (BPA) exposure causes significant damage to rat testes, including atrophy and impaired Leydig cell function. Higher doses and longer exposure times exacerbate these harmful reproductive effects.
Area of Science:
- Reproductive Toxicology
- Endocrinology
- Environmental Health
Background:
- Bisphenol A (BPA) is an endocrine-disrupting chemical with known reproductive and developmental toxicity.
- The specific impact of BPA on testicular tissues and their sensitivity remains incompletely understood.
Purpose of the Study:
- To investigate the dose-dependent, short- and long-term toxic effects of Bisphenol A (BPA) on rat testes.
- To elucidate the impact of BPA on testicular histology, Leydig cell function, and hormone levels.
Main Methods:
- Oral administration of varying BPA dosages (50, 100, 200 mg/kg) to Wistar albino male rats for 14 and 28 days.
- Histopathological examination (light and electron microscopy), immunohistochemistry for INSL3, and biochemical assays for serum testosterone (T) and luteinizing hormone (LH).
Main Results:
- High-dose BPA exposure led to severe testicular degeneration, including atrophy, spermatogenic arrest, and interstitial edema.
- Significant reductions in insulin-like factor 3 (INSL3) immunoreactivity, serum LH, and T levels were observed in BPA-treated groups.
- Both increased BPA dosage and duration of exposure correlated with more severe testicular damage.
Conclusions:
- Bisphenol A (BPA) exerts significant dose- and time-dependent toxicity on rat testes.
- Impaired Leydig cell function, evidenced by decreased INSL3 and T levels, is a key consequence of BPA exposure.
- These findings highlight BPA as a potent testicular toxicant requiring further investigation into human health risks.
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