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Various responses of male pituitary-gonadal axis to different intensities of long-term exercise: Role of expression of KNDYrelated genes.

J. Biosci.2018 Sep;43(4):569-574
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摘要


The essential role of regular physical activity has been emphasized for maintaining a healthy life. However, unfortunately, during the last few decades, the lifestyle of people has led to a decrease in physical activity. Research studies have shown that exercise of different intensities is applied on reproductive performance indices, luteinizing hormone (LH) and testosterone (T), with different effects. Nevertheless, the molecular and cellular mechanisms underlying its function are not completely understood. Therefore, this study aimed to evaluate the role of kisspeptin, neurokinin-B and pro-dynorphin (KNDY) gene-expression changes located in the upstream of GnRH neurons in transferring the effects of different long-term exercise intensities on male reproductive axis. Twenty-one adult Wistar rats were randomly divided into control, 6-month regular moderate exercise (RME-6) and 6-month regular intensive exercise (RIE-6). In moderate and intensive exercise groups, rats were treated 5 days a week for 60 min, at 22 and 35 m/min, respectively. Finally, the hypothalamic arcuate nucleus was isolated and the relative gene expression of kisspeptin (Kiss1), neurokinin-B (Nkb), pro-dynorphin (Pdyn) and gonadotropin-releasing hormone (Gnrh) genes were measured by realtime polymerase chain reaction method. The results showed that RIE-6 treatment decreased Gnrh and increased Pdyn mRNA levels in the arcuate nucleus. Furthermore, although RME-6 treatment decreased Nkb and increased Pdyn mRNA levels, the Gnrh mRNAwas not affected. Regarding the Gnrh mRNA levels and serum concentrations of reproductive indices (LH and T), moderate exercise did not impose harmful effects on the hypothalamic-pituitary-gonadal axis than intensive exercise. The different impacts of diverse long-term exercise intensities on the male pituitary-gonadal axis maybe relay by the various changes in hypothalamic Nkb and Pdyn gene expressions.

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