Therapeutic effects of myocardin-related transcription factor A (MRTF-A) knockout on experimental mice with nonalcoholic steatohepatitis induced by high-fat diet
| Autor: | Ding-Ding Zhang, Hua-Long Li, Lei Zhang, Xiao-Chun Cui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Nonalcoholic steatohepatitis medicine.medical_specialty Health Toxicology and Mutagenesis Toxicology Diet High-Fat 03 medical and health sciences chemistry.chemical_compound Mice 0302 clinical medicine Non-alcoholic Fatty Liver Disease Internal medicine medicine Animals Genetic Predisposition to Disease RNA Messenger Transcription factor Mice Knockout business.industry Therapeutic effect High fat diet NF-κB General Medicine Mice Inbred C57BL 030104 developmental biology Endocrinology chemistry Myocardin 030220 oncology & carcinogenesis Trans-Activators business |
| Zdroj: | Humanexperimental toxicology. 40(10) |
| ISSN: | 1477-0903 |
| Popis: | Objective: To explore the effects of myocardin-related transcription factor A (MRTF-A) knockout on mice with nonalcoholic steatohepatitis (NASH) induced by high-fat diet (HFD). Methods: Normal-fat diet (NFD) or HFD was fed to MRTF-A-knockout (MRTF-A−/−) and wild-type (WT) mice for 16 weeks. Liver histopathological status was observed using Hematoxylin and Eosin (HE) staining, Oil Red O staining, Sirius Red staining, and Immunohistochemical staining. The mRNA and protein levels in liver tissues were measured through quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and Western blot. Results: Compared with WT + HFD group, mice in MRTF-A−/− + HFD group were decreased in body weight, blood glucose, plasma insulin, liver TG and NAFLD activity score (NAS), with liver function recovery. Besides, compared with HFD-fed WT mice, HFD-fed MRTF-A−/− mice were improved in hepatic fibrosis, accompanied by decreased collagen content (%) and down-regulated expressions of α-SMA, COL1A2, TGFβ1, and SMAD3. In mice fed with HFD, the expression of MCP-1, CCR2, F4/80 and CD68 declined in liver tissues of MRTF-A−/− mice as compared with WT mice. Besides, in hepatic macrophages isolated from HFD-fed mice, the observed increased expression of TNF-α, IL-1β, MCP-1, as well as decreased expression of CCR2. Compared with WT + HFD group, MRTF-A−/− + HFD group mice were decreased regarding NF-κB p65 in liver tissues. Conclusion: MRTF-A knockout reduced macrophage infiltration, down-regulated NF-κB p65 expression, and ameliorated inflammation and fibrosis of liver tissues in mice, thereby becoming a potential therapeutic target for NASH treatment. |
| Databáze: | OpenAIRE |
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