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http://dx.doi.org/10.4217/OPR.2016.38.1.081

Effects of Fasting on Brain Expression of Kiss2 and GnRH I and Plasma Levels of Sex Steroid Hormones, in Nile Tilapia Oreochromis niloticus  

Park, Jin Woo (Marine Ecosystem and Biological Research Center, KIOST)
Kwon, Joon Yeong (Department of Aquatic Life Medical Sciences, College of Health Science, Sunmoon University)
Jin, Ye Hwa (Department of Aquatic Life Medical Sciences, College of Health Science, Sunmoon University)
Oh, Sung-Yong (Tongyeong Marine Science Station, KIOST)
Publication Information
Ocean and Polar Research / v.38, no.1, 2016 , pp. 81-88 More about this Journal
Abstract
In many fish species, including Nile tilapia (Oreochromis niloticus), gonadal development occurs at the expense of stored energy and nutrients. Therefore, reproductive systems are inhibited by limited food supply. It has been well established that reproductive function is highly sensitive to both metabolic status and energy balance. Nothing is known about the possible mediated connection between energy balance and reproduction. Kisspeptin, a neuropeptide product of the Kiss gene has emerged as an essential gatekeeper of reproduction and may be possibly be linked to energy balance and reproduction in non-mammalians. Thus, in this study, the effect of fasting (10 days) on the expression of kisspeptin and the gonadotropin-releasing hormone (GnRH) gene were assessed in Nile tilapia (male and female) using qRT-PCR. In addition, plasma levels of estradiol-$17{\beta}$ ($E_2$) and 11-ketotestosterone (11-KT) in adult tilapia were measured by ELISA. In male tilapia, fasting reduced Kiss2 and GnRH I mRNA expression in the brain and 11-KT level in comparison with the fed tilapia (p < 0.05). In females, however, there were no significant differences in GnRH I mRNA expression and $E_2$ between fish subjected to fasting and those fed (p > 0.05). These data indicate the impact of nutritional states on kisspeptin as a potential regulatory mechanism for the control of reproduction in male Nile tilapia.
Keywords
Oreochromis niloticus; Kiss2; GnRH I; sex steroid hormone; fasting;
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