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Expression of Nesfatin-1/NUCB2 and Its Binding Site in Mouse Ovary  

Kim, Jin-Hee (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Youn, Mi-Ra (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Bang, So-Young (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Sim, Ji-Yeon (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Kang, Hee-Rae (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Yang, Hyun-Won (Dept. of Bioenvironmental Technology, College of Natural Sciences, Seoul Women's University)
Publication Information
Development and Reproduction / v.14, no.4, 2010 , pp. 287-295 More about this Journal
Abstract
It was recently reported that nesfatin-1/NUCB2, which is secreted from the brain, controls appetite and energy metabolism. The purpose of this research was to confirm whether or not the protein and its binding site should have been expressed in the mouse reproductive organs and to know the possible effects of nesfatin-1 on the reproductive function. Using the ICR female mouse ovary and uterus, the expression of NUCB2 mRNA was confirmed with the conventional PCR and the relative amount of NUCB2 mRNA in the tissues was analyzed with real-time PCR. Immunohistochemical staining was performed using the nesfatin-1 antibody to investigate the nesfatin-1 protein expression and the biotin conjugated nesfatin-1 to confirm the binding site for nesfatin-1 in the ovary. Furthermore, in order to examine if the expression of NUCB2 mRNA in the ovary and uterus is affected by gonadotropin, its mRNA expression was analyzed after PMSG administration into mice. As a result, the expression level of NUCB2 mRNA in the ovary and the uterus was as much as the expression level in hypothalamus. As a result of the immunohistochemical staining, nesfatin-1 proteins were localized at the theca cells, the interstitial cells, and some of the luteal cells. However, the granulosa cells in the follicles did not stain. Interestingly, the oocytes in the some follicles were stained with nesfatin-1. On the other hand, nesfatin-1 protein binding sites were displayed at the theca cells and the interstitial cells near the tunica albuginea. After PMSG administration the expression level of NUCB2 mRNA was increased in the ovary and the uterus. These results demonstrate that for the first time the nesfatin-1 and its binding site were expressed in the ovary and NUCB2 mRNA expression was controlled by gonadotropin, suggesting an important role in the reproductive organs as a local regulator. Therefore, further study is needed to elucidate the functions of nesfatin-1 on the reproductive organs.
Keywords
Nesfatin-1; NUCB2; Ovary; PMSG; Uterus;
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