Effects of fasting on brain expression of Kiss2 and GnRH I and plasma levels of sex steroid hormones, in Nile tilapia Oreochromis niloticus SCOPUS KCI

Title
Effects of fasting on brain expression of Kiss2 and GnRH I and plasma levels of sex steroid hormones, in Nile tilapia Oreochromis niloticus
Author(s)
Park, J.W.; Kwon, J.Y.; Jin, Y.H.; Oh, S.-Y.
KIOST Author(s)
Oh, Sung Yong(오승용)
Publication Year
2016
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 qRTPCR. In addition, plasma levels of estradiol-17β (E2) 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 E2 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. © 2016, Korea Ocean Research and Development Institute. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2315
DOI
10.4217/OPR.2016.38.1.081
Bibliographic Citation
Ocean and Polar Research, v.38, no.1, pp.81 - 88, 2016
Publisher
Korea Ocean Research and Development Institute
Subject
Mammalia; Oreochromis niloticus; Pyronia tithonus; Tilapia
Keywords
Fasting; GnRH I; Kiss2; Oreochromis niloticus; Sex steroid hormone
Type
Article
Language
Korean
Document Type
Note
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

Fish aquaculture,Aquacultural engineering,Environmental physiology,어류 양식,양식 공학,환경생리학

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse