Abstract
Adiponectin is an adipose tissue hormone, participating in energy metabolism and involved in atherogenesis. Previously, it was found that adiponectin increases expression of the APOA1 (apolipoprotein A-1) gene in hepatocytes, but the mechanisms of this effect remained unexplored. Our aim was to investigate the role of adiponectin receptors AdipoR1/R2, AMP-activated protein kinase (AMPK), nuclear peroxisome proliferator-activated receptor alpha (PPARα) and liver X receptors (LXRs) in mediating the action of adiponectin on hepatic APOA1 expression in human hepatoma HepG2 cells. The level of APOA1 expression was determined by RT-qPCR and ELISA. We showed that the siRNA-mediated knockdown of genes coding for AdipoR1, AdipoR2, AMPK, PPARα, and LXRα and β prevented adiponectin-induced APOA1 expression in HepG2 cells and demonstrated that interaction of PPARα and LXRs with the APOA1 gene hepatic enhancer is important for the adiponectin-dependent APOA1 transcription. The results of this study point out to the involvement of both types of adiponectin receptors, AMPK, PPARα, and LXRs in the adiponectin-dependent upregulation of the APOA1 expression.
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Abbreviations
- ApoA-1:
-
apolipoprotein A-1
- AdipoR:
-
adiponectin receptor
- AICAR:
-
5-aminoimidazole-4-carboxamide ribonucleotide
- AMPK:
-
AMP-activated protein kinase
- HDL:
-
high density lipoproteins
- HE:
-
hepatocyte enhancer
- HNF4α:
-
hepatocyte nuclear factor 4α
- LKB-1:
-
hepatic kinase B1
- LXR:
-
liver X receptor
- siRNA:
-
small interfering RNA
- PPAR:
-
peroxisome proliferator-activator receptor
- RT-qPCR:
-
quantitative PCR with reverse transcription
- TNFα:
-
tumor necrosis factor
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The work was partially supported by the Russian Science Foundation (project no. 17-15-01326; experiments on the cell transfection with siRNAs and plasmids).
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D. A. Tanyanskiy, S. V. Orlov, and A. D. Denisenko developed the concept and managed the study; D. A. Tanyanskiy, V. S. Shavva, E. B. Dizhe, G. N. Oleinikova, A. V. Lizunov, E. V. Nekrasova, D. A. Mogilenko, E. E. Larionova, and S. V. Orlov conducted the experiments; D. A. Tanyanskiy, V. S. Shavva, D. A. Mogilenko, S. V. Orlov, and A. D. Denisenko discussed the results of the study; D. A. Tanyanskiy wrote the manuscript; D. A. Tanyanskiy, S. V. Orlov, and A. D. Denisenko edited the text of the article.
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Tanyanskiy, D.A., Shavva, V.S., Dizhe, E.B. et al. Adiponectin Stimulates Apolipoprotein A-1 Gene Expression in HepG2 Cells via AMPK, PPARα, and LXRs Signaling Mechanisms. Biochemistry Moscow 87, 1252–1259 (2022). https://doi.org/10.1134/S0006297922110049
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DOI: https://doi.org/10.1134/S0006297922110049