Abstract
Adiponectin protects against liver fibrosis, but the mechanisms have not been fully elucidated. Here, we showed that adiponectin upregulated inducible nitric oxide synthase (iNOS) messenger RNA (mRNA) and protein expression in hepatic non-parenchymal cells, particularly in hepatic stellate cells (HSCs), and increased nitric oxide (NO2−/NO3−) concentration in HSC-conditioned medium. Adiponectin attenuated HSC proliferation and migration but promoted apoptosis in a NO-dependent manner. More advanced liver fibrosis with decreased iNOS/NO levels was observed in adiponectin knockout mice comparing to wide-type mice when administered with CCI4 while NO donor supplementation rescued the phenotype. Further experiments demonstrated that adiponectin-induced iNOS/NO system activation is mediated through adipoR2-AMPK-JNK/Erk1/2-NF-κB signaling. These data suggest that adiponectin inhibits HSC function, further limiting the development of liver fibrosis at least in part through adiponectin-induced NO release. Therefore, adiponectin-mediated NO signaling may be a novel target for the treatment of liver fibrosis.
Key messages
• Adiponectin activates HSC iNOS/NO and SEC eNOS/NO systems.
• Adiponectin inhibits HSC proliferation and migration but promotes its apoptosis.
• Adiponectin inhibits CCL4-induced liver fibrosis by modulation of liver iNOS/NO.
• Adiponectin stimulates HSC iNOS/NO via adipoR2-AMPK-JNK/ErK1/2-NF-κB pathway.
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Abbreviations
- AD:
-
Adiponectin
- AD KO:
-
Adiponectin knockout
- AMPK:
-
Adenosine monophosphate-activated protein kinase
- αSMA:
-
Alpha smooth muscle actin
- CCL4:
-
Carbon tetrachloride
- Erk1/2:
-
Extracellular signal-regulated kinase1/2
- HSCs:
-
Hepatic stellate cells
- iNOS:
-
Inducible nitric oxide synthase
- JNK:
-
c-Jun terminal kinase
- l-NAME:
-
NG-nitro-l-arginine methyl ester, hydrochloride
- MAPK:
-
Ras-mitogen-activated protein kinase
- NO:
-
Nitric oxide
- nNOS:
-
Neuronal nitric oxide synthase
- NF-κB:
-
Nuclear factor kappa B
- PDGF:
-
Platelet-derived growth factor
- PDTC:
-
Ammonium pyrrolidinedithiocarbamate
- SECs:
-
Sinusoidal endothelial cells
- siRNA:
-
Small interfering RNA
- SMT:
-
S-methylisothiourea hemisulfate salt
- TGFβ1:
-
Transforming growth factor beta 1
- WT:
-
Wide type
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Acknowledgments
We thank Xin Wang (Flow Cytometry Facility, Westmead Millennium Institute) and Hong Yu (Microscopy Unit, Westmead Millennium Institute) for technical assistance. This study was supported by the National Health and Medical Research Council of Australia (AP1004595 and a Program Grant 1053206) and the Robert W. Storr Bequest to the University of Sydney.
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The authors declare that they have no competing interests.
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Zhixia Dong and Lin Su contributed equally to this work.
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Dong, Z., Su, L., Esmaili, S. et al. Adiponectin attenuates liver fibrosis by inducing nitric oxide production of hepatic stellate cells. J Mol Med 93, 1327–1339 (2015). https://doi.org/10.1007/s00109-015-1313-z
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DOI: https://doi.org/10.1007/s00109-015-1313-z