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Structural and functional characterization of turbot ppar gamma: Activation during high temperature and regulation of lipid metabolism

文献类型： 外文期刊

作者： Zhao, Tingting 1 ; Ma, Aijun 1 ; Huang, Zhihui 1 ; Liu, Zhifeng 1 ; Sun, Zhibin 1 ; Wang, Xinan 1 ; Xu, Rongjing 6 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China

2.Shandong Key Lab Marine Fisheries Biotechnol & Gen, Qingdao, Peoples R China

3.Qingdao Key Lab Marine Fish Breeding & Biotechnol, Qingdao 266071, Peoples R China

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

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

6.Tianyuan Fisheries Co Ltd, Yantai 264006, Peoples R China

7.106 Nanjing Rd, Qingdao 266071, Shandong, Peoples R China

关键词： Scophthalmus maximus; ppar?; Lipid metabolism; High temperature; RNAi

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：3.189； 五年影响因子：3.342 ）

ISSN： 0306-4565

年卷期： 2022 年 108 卷

页码：

收录情况： SCI

摘要： Transcription factors of the peroxisome proliferator-activated receptor gamma (ppar gamma) is a ligand-activated receptor that plays key roles in lipid metabolism and inflammation. In this study, we cloned the ppar gamma cDNA of turbot (Scophthalmus maximus). It has a 1659 bp coding sequence (CDS) and encodes 552 amino acids. The deduced PPAR gamma protein of turbot contains two highly conserved domains, a C4-type zinc finger, a nuclear hormone receptor DNA-binding region signature, and a HOLI domain (ligand-binding domain of hormone receptors) identical to that of in other species. qPCR results showed that the expression level of ppar gamma and the expression of the fatty acid transporters fatp and cd36 were significantly increased under high-temperature stress. This indicates that high temperatures activate the transcriptional activity of ppar gamma, and lipid metabolism plays an important role in turbot under high-temperature stress. In addition, RNA interference was used to explore the regulation of ppar gamma on lipid metabolism of turbot at high temperatures. The results showed that the mRNA level of ppar gamma was significantly decreased. After the expression level of ppar gamma was inhibited, the expression levels of fatp and cd36 were significantly decreased. At the same time, GW9662 (a ppar gamma antagonist) was used to inhibit ppar gamma activity in turbot kidney cells, and fatp and cd36 gene expressions were detected. The mRNA expression levels of ppar gamma, fatp, and cd36 were significantly decreased. Our results suggest that high temperatures activate ppar gamma in turbot and that ppar gamma regulates lipid transport and maintains lipid metabolism homeostasis through positive regulation of the expression of downstream genes fatp and cd36. This study further elucidates that the ppar gamma- mediated signaling pathway may play an important role in regulating lipid metabolism during heat stress in teleost fish.

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