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Osmoregulation by the myo-inositol biosynthesis pathway in turbot Scophthalmus maximus and its regulation by anabolite and c-Myc

文献类型： 外文期刊

作者： Ma, Aijun 1 ; Cui, Wenxiao 1 ; Wang, Xinan 1 ; Zhang, Wei 1 ; Liu, Zhifeng 1 ; Zhang, Jinsheng 1 ; Zhao, Tingting 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Qingdao Key Lab Marine Fish Breeding & Biotechnol, Yellow Sea Fisheries Res Inst, Shandong Key Lab Marine Fisheries Biotechnol & Ge, Qingdao 266071, Peoples R China

2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Biol & Biotechnol, Qingdao 266071, Peoples R China

3.Shanghai Ocean Univ, Minist Educ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China

关键词： MIB pathway; Knockdown; Osmoregulation; Negative feedback control; Positively regulate

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY （ 影响因子：2.32； 五年影响因子：2.465 ）

ISSN： 1095-6433

年卷期： 2020 年 242 卷

页码：

收录情况： SCI

摘要： The induction of the myo-inositol biosynthesis (MIB) pathway in euryhaline fishes is an important component of the cellular response to osmotic challenge. The MIPS and IMPA1 genes were sequenced in turbot and found to be highly conserved in phylogenetic evolution, especially within the fish species tested. Under salinity stress in turbot, both MIPS and IMPA1 showed adaptive expression, a turning point in the level of expression occurred at 12 h in all tissues tested. We performed an RNAi assay mediated by long fragment dsRNA prepared by transcription in vitro. The findings demonstrated that knockdown of the MIB pathway weakened the function of gill osmotic regulation, and may induce a genetic compensation response in the kidney and gill to maintain physiological function. Even though the gill and kidney conducted stress reactions or compensatory responses to salinity stress, this inadequately addressed the consequences of MIB knockdown. Therefore, the survival time of turbot under salinity stress after knockdown was obviously less than that under seawater, especially under low salt stress. Pearson's correlation analysis between gene expression and dietary myo-inositol concentration indicated that the MIB pathway had a remarkable negative feedback control, and the dynamic equilibrium mediated by negative feedback on the MIB pathway played a crucial role in osmoregulation in turbot. An RNAi assay with c-Myc in vivo and the use of a c-Myc inhibitor (10058-F4) in vitro demonstrated that c-Myc was likely to positively regulate the MIB pathway in turbot.

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