Citrinin exposure affects oocyte maturation and embryo development by inducing oxidative stress-mediated apoptosis
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Yu Wu1, Na Zhang1, Ying-Hua Li2, Liang Zhao3, Mo Yang1, Yimei Jin1, Yong-Nan Xu2 and Hongyan Guo1
1Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, P.R. China
2College of Agriculture, Yanbian University, Yanji 133002, P.R. China
3Department of Obstetrics and Gynecology, Beijing Jishuitan Hospital, Beijing 100035, P.R. China
Hongyan Guo, email: email@example.com
Yong-Nan Xu, email: firstname.lastname@example.org
Keywords: citrinin, oocyte, cytoskeleton, apoptosis, oxidative stress
Received: November 30, 2016 Accepted: January 11, 2017 Published: February 28, 2017
Citrinin is one of the mycotoxins and has been shown to have various toxic effects in animals and humans. Although previous study showed the toxic effects of citrinin on the female reproductive system, especially on oocyte maturation, however, the causes or mechanism of citrinin on oocyte quality is unclear. In present study we deeply investigated this topic. We found thatcitrinin toxin exposure inhibited mouse oocyte maturation and early embryo development. Further investigation showed that the actin distribution in oocytes and embryos was disrupted, and the reduced expression of actin nucleator ARP2 expression in the oocyte cortex further confirmed this. We also found that meiotic spindle morphology was abnormal after citrinin treatment. These results indicated that citrinin toxin exposure could disrupt cytoskeleton dynamics to affect oocyte maturation and early embryo development. We also examined the ROS level and early apoptosis marker Annexin signals, and the results showed that both levels increased, indicating that citrinin induced oxidative stress and further resulted in oocyte early apoptosis. Taken together, our results indicated that citrinin toxin exposure could reduce mouse oocyte maturation and early embryo development capability by affecting cytoskeletal dynamics, which may be due to the oxidative stress induced early apoptosis.
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