Impact of acute environmental challenges on the expression of peptide hormone-encoding genes in the zebrafish caudal neurosecretory system

IF 2.1 3区 生物学 Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
Bérénice Bichon, Gladys Alfama, Anne-Laure Gaillard, Hervé Tostivint, Guillaume Pézeron
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Abstract

The caudal neurosecretory system (CNSS) is a neuroendocrine complex unique to fish, first described in 1955. Since then, it has been hypothesized to contribute to several physiological processes, but its real functions remain largely unclear. However, so far, the many studies devoted to it agree that it could play an important role in osmoregulation. More recently, it has also been suggested that it could be involved in thermal adaptation. The zebrafish (Danio rerio) is a well-established model organism for functional studies. Yet so far, the functions of the CNSS have not been thoroughly investigated in this species. As a first step in such investigations, the present study aimed to identify environmental factors whose variations induce changes in CNSS endocrine activity. For this purpose, juvenile zebrafish were submitted to acute (2, 8, and 24 h) pH, salinity, and temperature challenges. As indicators of the CNSS endocrine activity, the expression levels of peptide hormone-encoding genes known or suspected to be synthesized in the CNSS were measured using quantitative PCR. The genes selected for this study were as follows: corticotropin-releasing hormone b (crhb), oxytocin (oxt), proenkephalin (penka and penkb), parathyroid hormone-like hormone (pthlha and pthlhb), stanniocalcin 2 (stc2a and stc2b), urotensin 1 (uts1) and urotensin 2 (uts2a and uts2b). Our findings revealed that the pH challenge affected the expression of three genes – crhb, penka, and stc2b - and the salinity challenge altered four genes - oxt, uts1, uts2a, and uts2b - while the temperature challenge modified the expression of all genes of our panel. These results indicated that the zebrafish CNSS is sensitive to changes in these environmental parameters and support the use of the zebrafish as a relevant model for studying the functions of the CNSS.

Abstract Image

急性环境挑战对斑马鱼尾部神经分泌系统中肽激素编码基因表达的影响。
尾端神经分泌系统(CNSS)是鱼类特有的神经内分泌复合体,于1955年首次被描述。从那以后,它被假设参与了几个生理过程,但它的真正功能在很大程度上仍不清楚。然而,到目前为止,许多研究都认为它可能在渗透调节中发挥重要作用。最近,也有人提出它可能与热适应有关。斑马鱼(Danio rerio)是一种公认的功能研究模式生物。然而,到目前为止,CNSS的功能尚未在该物种中得到彻底的研究。作为此类研究的第一步,本研究旨在确定引起CNSS内分泌活性变化的环境因素。为此,将幼斑马鱼置于急性(2、8和24 h) pH、盐度和温度挑战中。作为CNSS内分泌活性的指标,我们利用定量PCR检测了CNSS中已知或疑似合成的多肽激素编码基因的表达水平。本研究选择的基因为促肾上腺皮质激素释放激素b (crhb)、催产素(oxt)、前脑啡肽(penka和penkb)、甲状旁腺激素样激素(pthlha和pthlhb)、斯坦钙素2 (stc2a和stc2b)、尿紧张素1 (uts1)和尿紧张素2 (uts2a和uts2b)。研究结果显示,pH胁迫影响了三个基因(crhb、penka和stc2b)的表达,盐度胁迫改变了四个基因(oxt、uts1、uts2a和uts2b)的表达,而温度胁迫改变了所有基因的表达。这些结果表明,斑马鱼CNSS对这些环境参数的变化非常敏感,支持将斑马鱼作为研究CNSS功能的相关模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.00
自引率
4.30%
发文量
155
审稿时长
3 months
期刊介绍: Part A: Molecular & Integrative Physiology of Comparative Biochemistry and Physiology. This journal covers molecular, cellular, integrative, and ecological physiology. Topics include bioenergetics, circulation, development, excretion, ion regulation, endocrinology, neurobiology, nutrition, respiration, and thermal biology. Study on regulatory mechanisms at any level of organization such as signal transduction and cellular interaction and control of behavior are also published.
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