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Huangfu N, Ma H, Tian M, Zhang J, Wang Y, Li Z, Chen X, Cui H. DHX9 Strengthens Atherosclerosis Progression By Promoting Inflammation in Macrophages. Inflammation 2023; 46:1725-1738. [PMID: 37326773 PMCID: PMC10567826 DOI: 10.1007/s10753-023-01836-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 04/26/2023] [Accepted: 05/11/2023] [Indexed: 06/17/2023]
Abstract
Atherosclerosis (AS) is the main cause of cerebrovascular diseases, and macrophages play important roles in atherosclerosis. DExH-Box helicase 9 (DHX9), as a member of DExD/H-box RNA helicase superfamily II, is identified as an autoantigen in the sera of systemic lupus erythematosus patients to trigger inflammation. The aim of this study was to investigate whether DHX9 is involved in AS development, especially in macrophages-mediated-inflammatory responses. We find that DHX9 expression is significantly increased in oxLDL or interferon-γ-treated macrophages and peripheral blood mononuclear cells (PBMCs) from patients with coronary artery disease (CAD). Knockdown of DHX9 inhibits lipid uptake and pro-inflammatory factors expression in macrophages, and ameliorates TNF-α-mediated monocyte adhesion capacity. Furthermore, we find that oxLDL stimulation promotes DHX9 interaction with p65 in macrophages, and further enhances the transcriptional activity of DHX9-p65-RNA Polymerase II complex to produce inflammatory factors. Moreover, using ApoE -/- mice fed with western diet to establish AS model, we find that knockdown of DHX9 mediated by adeno-associated virus-Sh-DHX9 through tail vein injection evidently alleviates AS progression in vivo. Finally, we also find that knockdown of DHX9 inhibits p65 activation, inflammatory factors expression, and the transcriptional activity of p65-RNA Polymerase II complex in PBMCs from patients with CAD. Overall, these results indicate that DHX9 promotes AS progression by enhancing inflammation in macrophages, and suggest DHX9 as a potential target for developing therapeutic drug.
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Affiliation(s)
- Ning Huangfu
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China
| | - Hongchuang Ma
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China
| | - Mengyun Tian
- School of Medicine, Ningbo University, Ningbo, 315000, China
| | - Jie Zhang
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China
- School of Medicine, Ningbo University, Ningbo, 315000, China
| | - Yong Wang
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China
| | - Zhenwei Li
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China
| | - Xiaomin Chen
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China.
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China.
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China.
| | - Hanbin Cui
- Department of Cardiology, Ningbo First Hospital, Ningbo, 315000, China.
- Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhejiang Province, Ningbo, 315000, China.
- Clinical Medicine Research Centre for Cardiovascular Disease of Ningbo, Ningbo, 315000, China.
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