MicroRNA-124 inhibits hepatic stellate cells inflammatory cytokines secretion by targeting IQGAP1 through NF-κB pathway

• Published in: International immunopharmacology Vol. 95; p. 107520
• Main Authors: Yang, Junfa, Xu, Changqing, Wu, Maomao, Wu, Ying, Jia, Xiaodi, Zhou, Chang, Zhang, Xianzheng, Ge, Shenglin, Li, Zeng, Zhang, Lingling
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.06.2021; Elsevier BV
• Subjects: 3' Untranslated regions; Animals; Bile; Biomarkers; Cell Line; Cytokines; Cytokines - genetics; Cytokines - immunology; Fibrosis; Hepatic Stellate Cells - immunology; Hepatocellular carcinoma; Humans; IL-1β; Inflammation; Inflammation - genetics; Inflammation - immunology; Interleukin 6; IQGAP1; IQGAP1 protein; Liver; Liver Cirrhosis - genetics; Liver Cirrhosis - immunology; Liver diseases; Liver fibrosis; Male; Mice; Mice, Inbred C57BL; MicroRNAs; miR-124; miRNA; NF-kappa B - immunology; NF-κB; NF-κB protein; ras GTPase-Activating Proteins - genetics; ras GTPase-Activating Proteins - immunology; RNA, Small Interfering - genetics; Signal Transduction; Signaling; Stellate cells; Transcription; Tumor necrosis factor-α; miR-124; NF-κB; Inflammation; Liver fibrosis; IQGAP1
• ISSN: 1567-5769; 1878-1705
• DOI: 10.1016/j.intimp.2021.107520

•Anti-inflammatory effects of miR-124 in liver fibrosis.•miR‐124 specifically targeted the 3′‐UTR of IQGAP1.•Overexpression of miR-124 and knockdown of IQGAP1 could inhibit activation of NF-κB signaling pathway.•miR-124 could regulate TNF-α-enhanced cytokine secretion of LX-2 cells via regulating NF-κB signaling pathway. Liver fibrosis is a health concern that leads to organ failure mediated via production of inflammatory cytokines and fibrotic biomarkers. To date, there was no direct approved antifibrotic therapy, and current treatment was mainly the removal of the causative factor. Recent studies demonstrated that aberrant expression of miR-124 was involved in the progression of various liver diseases including hepatocellular carcinoma (HCC). However, whether miR-124 could function as a transcriptional regulator in the inflammatory cytokines secretion of liver fibrosis remains unclear. In this study, we demonstrated that the expression of miR-124 was downregulated in liver fibrosis tissues and TNF-α-induced LX-2 cells, concomitant with the upregulated expression of IQGAP1, suggesting that miR-124 and IQGAP1 might be associated with the development of inflammation in liver fibrosis. Therefore, we demonstrated that the overexpression of miR-124 and knockdown of IQGAP1 could lead to the downregulation of TNF-α, IL-1β and IL-6. While knockdown of miR-124 or overexpression of IQGAP1 showed reversed results. Moreover, dual luciferase reporter assays demonstrated that miR‐124 specifically targeted the 3′‐UTR of IQGAP1, and thus inhibited the expression of IQGAP1. Mechanistically, we found that the expression changes of miR-124 and IQGAP1 could be involved in inhibition or activation of NF-κB signaling pathway in response to TNF-α. In conclusion, these results indicated that miR-124 plays a crucial role in TNF-α-induced LX-2 cells via regulating NF-κB signaling pathway.