Hnf4α is involved in the regulation of vertebrate LC-PUFA biosynthesis: insights into the regulatory role of Hnf4α on expression of liver fatty acyl desaturases in the marine teleost Siganus canaliculatus

Wang, Shuqi; Chen, Junliang; Jiang, Danli; Zhang, Qinghao; You, Cuihong; Tocher, Douglas R.; Monroig, Óscar; Dong, Yewei; Li, Yuanyou

doi:10.1007/s10695-018-0470-8

Published: 19 January 2018

Hnf4α is involved in the regulation of vertebrate LC-PUFA biosynthesis: insights into the regulatory role of Hnf4α on expression of liver fatty acyl desaturases in the marine teleost Siganus canaliculatus

Shuqi Wang¹,
Junliang Chen¹,
Danli Jiang¹,
Qinghao Zhang¹,
Cuihong You¹,
Douglas R. Tocher³,
Óscar Monroig³,
Yewei Dong^1,2 &
Yuanyou Li²

Fish Physiology and Biochemistry volume 44, pages 805–815 (2018)Cite this article

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Abstract

Long-chain polyunsaturated fatty acid (LC-PUFA) biosynthesis is an important metabolic pathway in vertebrates, especially fish, considering they are the major source of n-3 LC-PUFA in the human diet. However, most fish have only limited capability for biosynthesis of LC-PUFA. The rabbitfish (Siganus canaliculatus) is able to synthesize LC-PUFA as it has all the key enzyme activities required including Δ6Δ5 Fads2, Δ4 Fads2, Elovl5, and Elovl4. We previously reported a direct interaction between the transcription factor Hnf4α and the promoter regions of Δ4 and Δ6Δ5 Fads2, which suggested that Hnf4α was involved in the transcriptional regulation of fads2 in rabbitfish. For functionally investigating it further, a full-length cDNA of 1736-bp-encoding rabbitfish Hnf4α with 454 amino acids was cloned, which was highly expressed in intestine, followed by liver and eyes. Similar to the expression characteristics of its target genes Δ4 and Δ6Δ5 fads2, levels of hnf4α mRNA in liver and eyes were higher in fish reared at low salinity than those reared in high salinity. After the rabbitfish primary hepatocytes were, respectively, incubated with alverine, benfluorex or BI6015, which were anticipated agonists or antagonist for Hnf4α, the mRNA level of Δ6Δ5 and Δ4 fads2 displayed a similar change tendency with that of hnf4α mRNA. Furthermore, when the mRNA level of hhf4α was knocked down using siRNA, the expression of Δ6Δ5 and Δ4 fads2 also decreased. Together, these data suggest that Hnf4α is involved in the transcriptional regulation of LC-PUFA biosynthesis, specifically, by targeting Δ4 and Δ6Δ5 fads2 in rabbitfish.

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Acknowledgements

This work was financially supported by the Major International Joint Research Project from National Natural Science Foundation of China (NSFC) (31110103913), China Agriculture Research System (CARS-47), and Innovation and Strong School Projects in Guangdong Province (2015KCXTD017, 2016KTSCX037).

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Affiliations

Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong, 515063, China
Shuqi Wang, Junliang Chen, Danli Jiang, Qinghao Zhang, Cuihong You & Yewei Dong
School of Marine Sciences, South China Agricultural University, Guangzhou, Guangdong, 510642, China
Yewei Dong & Yuanyou Li
Institute of Aquaculture, Faculty of Natural Sciences, University of Stirling, Stirling, Scotland, FK9 4LA, UK
Douglas R. Tocher & Óscar Monroig

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Shuqi Wang
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Junliang Chen
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Danli Jiang
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Qinghao Zhang
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Cuihong You
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Douglas R. Tocher
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Óscar Monroig
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Yewei Dong
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Yuanyou Li
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Correspondence to Yuanyou Li.

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Wang, S., Chen, J., Jiang, D. et al. Hnf4α is involved in the regulation of vertebrate LC-PUFA biosynthesis: insights into the regulatory role of Hnf4α on expression of liver fatty acyl desaturases in the marine teleost Siganus canaliculatus. Fish Physiol Biochem 44, 805–815 (2018). https://doi.org/10.1007/s10695-018-0470-8

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Received: 06 September 2017
Accepted: 11 January 2018
Published: 19 January 2018
Issue Date: June 2018
DOI: https://doi.org/10.1007/s10695-018-0470-8

Keywords

Fatty acyl desaturase
LC-PUFA biosynthesis
Hnf4α
Transcriptional regulation mechanism
Rabbitfish Siganus canaliculatus