Abstract
Purpose
Investigating the hepatoprotective effect of calycosin against acute liver injury in association with FXR activation and STAT3 phosphorylation.
Methods
The acute liver injury model was established by intraperitoneal injection of CCl4 in C57BL/6 mice. Serum alanine aminotransferase, aspartate aminotransferase, HE staining and TUNEL assay were used to identify the amelioration of the liver histopathological changes and hepatocytes apoptosis after calycosin treatment. ELISA kit and 5-bromo-2-deoxyuridine immunohistochemistry were used to measure the liver bile acid concentration and hepatocyte mitotic rate in vivo. The relation between calycosin and activation of FXR and STAT3 was comfirmed using the Luciferase assay, Molecular docking, Real-time PCR and Western Blot in vitro.
Results
The liver histopathological changes, hepatocytes apoptosis, liver bile acid overload and hepatocyte mitosis showed significant changes after calycosin treatment. Calycosin promoted the expression of FXR target genes such as FoxM1B and SHP but the effect was reversed by FXR suppressor guggulsterone. Molecular docking results indicated that calycosin could be embedded into the binding pocket of FXR, thereby increasing the expressions of STAT3 tyrosine phosphorylation and its target genes, Bcl-xl and SOCS3.
Conclusions
Calycosin plays a critical role in hepatoprotection against liver injury in association with FXR activation and STAT3 phosphorylation.
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Abbreviations
- ALT:
-
Alanine aminotransferase
- AST:
-
Aspartate aminotransferase
- BA:
-
Bile acid
- Bcl-xl:
-
B-cell lymphoma-extra large
- BSEP:
-
Bile salt export pump
- CNTF:
-
Ciliary neurotrophic factor
- CYP450:
-
Cytochrome P450
- CYP7A1:
-
Cytochrome P450 7A1
- FoxM1B:
-
Forkhead box M1B
- FXR:
-
Farmesoid X receptor
- LIF:
-
Leukemia inhibitory factor
- SHP:
-
Small heterodimer partner
- SOCS3:
-
Suppressor of cytokine signaling 3
- STAT3:
-
Signal transducer and activator of transcription 3
- TCMs:
-
Traditional Chinese medicines
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ACKNOWLEDGMENTS AND DISCLOSURES
This work was supported by a grant from the National Natural Science Foundation of The People’s Republic of China (No. 81273580, 81302826).
The authors declare that there are no conflicts of interest.
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Chen, X., Meng, Q., Wang, C. et al. Protective Effects of Calycosin Against CCl4-Induced Liver Injury with Activation of FXR and STAT3 in Mice. Pharm Res 32, 538–548 (2015). https://doi.org/10.1007/s11095-014-1483-3
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DOI: https://doi.org/10.1007/s11095-014-1483-3