Abstract
Some diseases related to lipid metabolism increase yearly in cultured fish, and the farnesoid X receptor (FXR) is a nuclear protein that plays a key role in inflammatory responses and lipid metabolism. However, the roles of FXR in hybrid grouper (Epinephelus fuscoguttatus♀ × E. lanceolatus♂) remain poorly understood. The main objective of this study was to explore the roles of hepatic FXR in triggering the immune response and the potential functions of FXR in regulating the lipid metabolism. In the present study, the full-length sequence of fxr from hybrid grouper was cloned and characterized for the first time. Upon the Vibrio parahaemolyticus stimulation, the transcriptional level of fxr was rapidly elevated in the head kidney tissue in the early stage of infection. In vivo and vitro, activation of FXR by obeticholic acid (OA) significantly increased the concentrations and mRNA levels of hepatic inflammatory cytokines. These effects were inversed when FXR was inhibited by guggulsterone (GU). Moreover, the activation of FXR to suppress the PI3K/AKT/mTOR signaling pathway improves hepatic lipid metabolism and reduces hepatic lipid accumulation in vivo and vitro. In addition, the inhibition of FXR activated the PI3K/AKT/mTOR pathway, decreased the lipolysis and increased the lipogenesis, and subsequently increased the lipid accumulation in fish. These results revealed the positive roles of FXR in triggering immune responses and improving lipid metabolism and accumulation in hybrid grouper.
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Abbreviations
- 3-pdk1:
-
3-Phosphoinositide dependent kinase-1
- 6pgd:
-
6-Phosphogluconate dehydrogenase
- acc:
-
Acetyl-CoA carboxylase
- AKT:
-
Serine/threonine-protein kinase
- atgl:
-
Adipose triglyceride lipase
- cpt1:
-
Carnitine palmitoyltransferase 1
- deptor:
-
DEP domain-containing mTOR-interacting protein
- dgka:
-
Diacylglycerol kinase alpha
- fas:
-
Fatty acid synthase
- FXR:
-
Farnesoid X receptor
- g6pd:
-
Glucose 6-phosphate dehydrogenase
- GU:
-
Guggulsterone
- hl:
-
Hepatic lipase
- hsl:
-
Hormone-sensitive lipase
- lxr:
-
Liver X receptor alpha
- me:
-
Malic enzyme
- mlst8:
-
Target of rapamycin complex subunit lst 8
- il1β:
-
Interleukin 1β
- mTORC1:
-
Mammalian target of rapamycin complex 1
- OA:
-
Obeticholic acid
- PI3K:
-
Phosphatidylinositol 3-kinase
- pi3k-rs5:
-
Phosphatidylinositol 3-kinase regulatory subunit 5
- pras40:
-
Proline-rich Akt1 substrate 1
- prr5:
-
Proline-rich protein 5
- pparα:
-
Peroxisome proliferator-activated receptor alpha
- PPARγ:
-
Peroxisome proliferator-activated receptor-gamma
- raptor:
-
Regulatory associated protein of mTOR
- RHEB:
-
Ras homolog enriched in brain
- RICTOR:
-
Rapamycin-insensitive companion of mTOR
- SIN1:
-
Target of rapamycin complex 2 subunit
- SREBP1:
-
Sterol-regulator element-binding protein 1
- tel:
-
Telomere length regulation protein
- TG:
-
Triglycerides
- tsc1:
-
Tuberous 1
- tnfα:
-
Tumor necrosis factor-alpha
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Acknowledgements
We sincerely thank Xiaohui Dong, Hongyu Liu, and Qihui Yang (Laboratory of Aquatic Animal Nutrition and Feed of Fisheries College of the Guangdong Ocean University of Zhanjiang in China) for providing methodological help during the experiments and proofreading the article.
Funding
This work was supported by the National Key R&D Program of China [2019YFD0900200], the China Agriculture Research System of MOF and MARA [CARS-47], the Science and Technology Project of Zhanjiang [2020A05003], the National Natural Science Foundation of China [no. 31772864], and the Natural Science Foundation of Guangdong Province [2018A030313154&2020A1515011129].
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Jia Xu conducted the methodology, formal analysis, investigation, data curation, and writing—original draft; Xinzhou Yao conducted the data curation, investigation, and writing—original draft; Xiaoyue Li conducted the investigation, data curation, and visualization; Shiwei Xie conducted the conceptualization, resources, and visualization; Shuyan Chi conducted the methodology and conceptualization; Shuang Zhang conducted the conceptualization and funding acquisition; Junming Cao conducted the methodology, conceptualization, and funding acquisition; and Beiping Tan conducted the methodology, conceptualization, writing—review and editing, and funding acquisition. All authors read and approved the final manuscript.
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Highlights
• The full-length sequence of fxr from hybrid grouper was cloned for the first time.
• Tnhibition of FXR decreased the expression of inflammatory cytokines.
• Activation of hepatic FXR improved the lipid accumulation and metabolism.
• Inhibition of FXR activated the PI3K/AKT/mTOR pathway in vivo and vitro.
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Xu, J., Yao, X., Li, X. et al. Farnesoid X receptor regulates PI3K/AKT/mTOR signaling pathway, lipid metabolism, and immune response in hybrid grouper. Fish Physiol Biochem 48, 1521–1538 (2022). https://doi.org/10.1007/s10695-022-01130-z
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DOI: https://doi.org/10.1007/s10695-022-01130-z