The Daily Expression Profile of Neuropeptides ( gnih, gnrh3, kiss1 and kiss2 ):A Study of Possible Interaction in the Brain of Zebrafish ( Danio rerio )

Z. A. Khan, R. K. Labala, G. Mondal, Haobijam Sanjita Devi, Chongtham Rajiv, Thangal Yumnamcha, S. D. Devi, R. Bharali, S. Thorat, A. Chattoraj
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Abstract

Involvement of neuropeptides in the reproduction of fish (seasonal/regular) is known. The daily rhythmicity and their possible interaction of four major neuropeptides namely gnih , gonadotropin-inhibitory hormone; gnrh, gonadotropinreleasing hormone; kiss1/2, kisspeptin 1/2; is not known to any fish. Our present study on the whole brain of zebrafish (Danio rerio) aimed at the daily rhythmicity of the mRNA expression of these four neuropeptides in a 12 h light/12 h dark photoperiod (LD). Only kiss2 in its expression gives a rhythmicity but other three peptides are not rhythmic. Moreover, the expression of gnih is 10-fold lower than gnrh3. Our STRING network analysis suggests kiss2 act as the mediator to communicate with gnih , gnrh3, and kiss1. Our present finding is indicating the important role of kiss2 in mediating the reproductive signal and may play a central role in the synchronization of the environmental signal and reproductive periodicity.
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神经肽(gnih, gnrh3, kiss1和kiss2)的日常表达谱:斑马鱼大脑中可能相互作用的研究
神经肽参与鱼类的繁殖(季节性/规律性)是已知的。四种主要神经肽(gnih、促性腺激素抑制激素)的日常节律性及其可能的相互作用;促性腺激素释放激素;Kiss1/2, kisspeptin /2;是任何鱼都不知道的。我们对斑马鱼全脑(Danio rerio)的研究旨在研究这四种神经肽在12小时光照/12小时黑暗光周期(LD)下mRNA表达的日常节律性。只有kiss2在表达上具有节奏性,其他三个肽则没有节奏性。此外,gnih的表达量比gnrh3低10倍。我们的STRING网络分析表明,kiss2充当与gnih、gnrh3和kiss1通信的中介。我们目前的发现表明,kiss2在调节生殖信号中起着重要作用,并可能在环境信号和生殖周期的同步中发挥核心作用。
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