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Aroclor 1254 impairs spermatogenesis and induces oxidative stress in rat testicular mitochondria
Hamdy A A Aly1, Oscar Domènech, Ashraf B Abdel-Naim
1Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr City, Cairo, Egypt. hamdyaali@yahoo.com
Abstract:
Aroclor 1254 (A1254) has been shown to have potential testicular toxicity. The mechanism of action of A1254 on male reproduction is not clear. The present study was designed to investigate the potential toxicity of A1254 on rat spermatogenesis. Oxidative stress was also assessed in testicular mitochondria as an underlying mechanism. Adult male Wistar rats were injected with A1254 (0, 0.75, 1.5 or 3mg/kg/day i.p.) or with vehicle (corn oil) for 20 consecutive days. A1254 at doses of 1.5 and 3mg/kg/day resulted in a significant decrease in body weight, testes weight, epididymal and relative epididymal weight. Similarly, the relative testis weight was significantly decreased at 3mg/kg/day. Sperm count, motility and daily sperm production were significantly decreased at 1.5 and 3mg/kg/day. The same two doses significantly inhibited the activities of testicular mitochondrial CAT, GPx and GR while the activity of SOD was significantly decreased by 0.75, 1.5 and 3mg/kg/day. The levels of H(2)O(2) generation and LPO were significantly increased in mitochondria in a dose-related pattern. GSH and Vit C were significantly decreased at 0.75, 1.5 and 3mg/kg/day. In conclusion, A1254 impairs spermatogenesis as evidenced, at least partly, by induction of oxidative stress in testicular mitochondria.
Insights
Aroclor 1254 (A1254) exposure significantly impairs rat spermatogenesis and reproductive health. This toxicity is linked to increased oxidative stress within testicular mitochondria, affecting sperm production and quality.
Area of Science:
- Reproductive Toxicology
- Environmental Health
- Mitochondrial Biochemistry
Background:
- Aroclor 1254 (A1254) is a polychlorinated biphenyl (PCB) congener with suspected testicular toxicity.
- The precise mechanisms by which A1254 affects male reproductive function remain incompletely understood.
- Investigating A1254's impact on spermatogenesis and oxidative stress is crucial for understanding its reproductive risks.
Purpose of the Study:
- To evaluate the toxic effects of A1254 on rat spermatogenesis.
- To determine if A1254-induced testicular toxicity is mediated by oxidative stress in testicular mitochondria.
Main Methods:
- Adult male Wistar rats were administered daily intraperitoneal injections of A1254 (0, 0.75, 1.5, or 3 mg/kg/day) or vehicle for 20 days.
- Evaluated parameters included body and testes weights, sperm count, motility, and daily sperm production.
- Assessed testicular mitochondrial oxidative stress markers: enzyme activities (CAT, GPx, GR, SOD), hydrogen peroxide (H2O2) generation, lipid peroxidation (LPO), and levels of glutathione (GSH) and Vitamin C.
Main Results:
- A1254 exposure at 1.5 and 3 mg/kg/day significantly reduced body weight, testes weight, and epididymal weights.
- Sperm count, motility, and daily sperm production were significantly decreased at the same higher doses.
- A1254 induced significant oxidative stress in testicular mitochondria, evidenced by altered enzyme activities, increased H2O2 and LPO, and depleted GSH and Vitamin C levels in a dose-dependent manner.
Conclusions:
- Aroclor 1254 significantly impairs spermatogenesis in male rats.
- The observed testicular toxicity is, at least partially, mediated by the induction of oxidative stress within testicular mitochondria.
- These findings highlight the reproductive hazard posed by A1254 exposure.
