Administration of isoliquiritigenin prevents nonalcoholic fatty liver disease through a novel IQGAP2‐CREB‐SIRT1 axis
| Autor: | Xiaoxiao Liu, Ping Li, Xiaojun Xu, Wei-Tao Zhang, Ping Wu, Pingping Li, Chao Peng, Feng-Rong Qi-Li, Li Zhang, Sheng-Ye Yang |
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| Rok vydání: | 2021 |
| Předmět: |
CREB
Mice 03 medical and health sciences chemistry.chemical_compound Chalcones 0302 clinical medicine Sirtuin 1 Lipid oxidation Non-alcoholic Fatty Liver Disease Nonalcoholic fatty liver disease medicine Animals Cyclic AMP Response Element-Binding Protein Pharmacology 0303 health sciences Gene knockdown biology Chemistry Kinase 030302 biochemistry & molecular biology Lipid metabolism Lipid Metabolism medicine.disease Cell biology Mice Inbred C57BL Liver ras GTPase-Activating Proteins 030220 oncology & carcinogenesis biology.protein Phosphorylation lipids (amino acids peptides and proteins) Isoliquiritigenin |
| Zdroj: | Phytotherapy Research. 35:3898-3915 |
| ISSN: | 1099-1573 0951-418X |
| Popis: | Isoliquiritigenin (ISO) is a flavonoid extracted from the root of licorice, which serves various biological and pharmacological functions including antiinflammatory, antioxidation, liver protection, and heart protection. However, the mechanism of its action remains elusive and the direct target proteins of ISO have not been identified so far. Through cell-based screening, we identified ISO as a potent lipid-lowering compound. ISO treatment successfully ameliorated fatty acid-induced cellular lipid accumulation and improved nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH) by increasing PPARα-dependent lipid oxidation and decreasing SREBPs-dependent lipid synthesis. Both these signaling required the activation of SIRT1. Knockdown of SIRT1 resulted in the reversal of ISO beneficiary effects suggesting that the lipid-lowering activity of ISO was regulated by SIRT1 expression. To identify the direct target of ISO, limited proteolysis combined with mass spectrometry (LiP-SMap) strategy was applied and IQGAP2 was identified as the direct target for ISO in regulating lipid homeostasis. In the presence of ISO, both mRNA and protein levels of SIRT1 were increased; however, this effect was abolished by blocking IQGAP2 expression using siRNA. To explore how IQGAP2 regulated the expression level of SIRT1, proteome profiler human phospho-kinase array kit was used to reveal possible phosphorylated kinases and signaling nodes that ISO affected. We found that through phosphorylation of CREB, ISO transduced signals from IQGAP2 to upregulate SIRT1 expression. Thus, we not only demonstrated the molecular basis of ISO in regulating lipid metabolism but also exhibited for the first time a novel IQGAP2-CREB-SIRT1 axis in treating NAFLD/NASH. |
| Databáze: | OpenAIRE |
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