Sodium Arsenite Injection Induces Ovarian Oxidative Stress and Affects Steroidogenesis in Rats
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Oxidative stress is involved in the regulation of mammalian reproduction. The present study was conducted to detect the sodium arsenite-induced oxidative stress and alterations in the structure and steroidogenesis in rat ovary. Twenty female adult rats were injected i.p. with sodium arsenite (8 mg/kg BW, T) or 0.9% saline (C) for 16 days. The oxidative stress indexes and morphology of the liver, kidney, and ovary were detected using commercial kits and HE staining, respectively. The serum progesterone and estradiol were detected by RIA, and the ovarian steroidogenic gene expressions were detected by real-time PCR. Results showed that the ovarian activities of SOD and GSH-PX decreased (P < 0.05), while the ROS activity and MDA level increased (P < 0.05) in the T group. HE staining results showed that treatment with sodium arsenite damaged the ovarian morphology, resulting in reduced large and medium follicles and increased atretic follicles. Nonetheless, neither the liver nor kidney showed evident changes in the oxidative stress indexes or morphology after sodium arsenite treatment. The serum progesterone and estradiol levels decreased (P < 0.05) with the reduced expressions in the ovarian steroidogenic genes (StAR, P450scc, and 3β-HSD) (P < 0.05). In conclusion, sodium arsenite injection can induce ovarian oxidative stress in rats which set up an appropriate model for future studies of ovarian diseases as well as the toxic mechanism of arsenic in the reproduction.
KeywordsOvary Oxidative stress Sodium arsenite Steroidogenesis
We express our gratitude to Miss. Ngekure M.X Kavita from University of Namibia for reading/editing the manuscripts
This work was supported by the National Nature Science Foundation of China (No. 31501956) and the Fundamental Research Funds for the Central Universities (KJQN201608 and Y0201500204).
Compliance with Ethical Standards
All surgical procedures were approved by the Institutional Animal Care and Use Committee of Nanjing Agricultural University.
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