Dynamic aspects of ovarian superoxide dismutase isozymes during the ovulatory process in the rat. |
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| Authors: | E F Sato H Kobuchi K Edashige M Takahashi T Yoshioka K Utsumi M Inoue |
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| Institution: | Department of Medical Biology, Kochi Medical School, Japan. |
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| Abstract: | To investigate the role of superoxide dismutase (SOD) in the ovulatory process, SOD isozymes and their mRNAs were determined in the ovary of 22-day-old rats. After treatment with pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG), ovarian activity of Mn-SOD decreased markedly while Cu/Zn-SOD remained unchanged. However, the ovarian level of mRNA for Mn-SOD markedly increased after hCG-treatment while that for Cu/Zn-SOD decreased only slightly. Ovulation was inhibited by intravenous injection of a long-acting SOD. These results suggested that superoxide radicals in the ovary might play a critical role in the mechanism for hCG-induced ovulation. |
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