2. Academic Validation
  3. GSDMB involvement in the pathogenesis of abdominal aortic aneurysm through regulation of macrophage non-canonical pyroptosis

GSDMB involvement in the pathogenesis of abdominal aortic aneurysm through regulation of macrophage non-canonical pyroptosis

  • Arch Biochem Biophys. 2024 Jul 17:759:110102. doi: 10.1016/j.abb.2024.110102.
Xiaoping Xie 1,  Xiaoyan Shen 1,  Yi Liu 2,  Yifan Zuo 2,  Su Wang 3,  Yang Zhou 1,  Xu Li 1,  Kexin Wang 1,  Bowen Li 4,  Zhiwei Wang 5
Affiliations

Affiliations

  • 1 Department of Cardiovascular Surgery, Renmin Hospital of Wuhan University, 99# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China; Central Laboratory, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China.
  • 2 Department of Thoracic Surgery, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China; Central Laboratory, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China.
  • 3 Department of Anesthesiology, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China; Central Laboratory, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China.
  • 4 Department of Cardiovascular Surgery, Renmin Hospital of Wuhan University, 99# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China; Central Laboratory, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China. Electronic address: bowenli@whu.edu.cn.
  • 5 Department of Cardiovascular Surgery, Renmin Hospital of Wuhan University, 99# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China; Central Laboratory, Renmin Hospital of Wuhan University, 9# Zhangzhidong Road, Wuhan, 430000, Hubei Province, China. Electronic address: wangzhiwei@whu.edu.cn.
PMID: 39029644 DOI: 10.1016/j.abb.2024.110102
Abstract

Abdominal aortic aneurysm (AAA) is a dangerous condition affecting the aorta. Macrophage Pyroptosis, phenotypic transformation, and Apoptosis of aortic smooth muscle cells (ASMCs) are pivotal mechanisms in AAA pathogenesis. This study explores how Gasdermin B (GSDMB) regulates macrophage non-canonical Pyroptosis and its impact on the phenotypic transformation and Apoptosis of ASMCs, thereby unveiling the role of GSDMB in AAA pathogenesis. Immunofluorescence analysis was used to assess the expression levels and localization of GSDMB, cysteinyl aspartate-specific protease-4 (Caspase-4), and N-terminal of cleaved GSDMD (N-GSDMD) in AAA tissues. A cell model that mimics macrophage non-canonical Pyroptosis was established by treating THP-1 cells with lipopolysaccharide (LPS). THP-1 cells with reduced or increased GSDMB were generated using small interfering RNA (siRNA) or plasmids. Co-culture experiments involving THP-1 cells and HASMCs were conducted to explore the impact of GSDMB on HASMCs. The mitochondrial Reactive Oxygen Species (mtROS) scavenger Mito-TEMPO lowered mtROS levels in THP-1 cells. Our findings revealed that GSDMB was significantly upregulated in AAA macrophages, which was accompanied by robust non-canonical Pyroptosis. THP-1 cells showed non-canonical Pyroptosis in response to LPS, which was accompanied by an increase in GSDMB. Further research demonstrated that altering GSDMB, either by knockdown or overexpression, can affect macrophage non-canonical Pyroptosis as well as the phenotypic transformation and Apoptosis of HASMCs. LPS-induced non-canonical Pyroptosis in THP-1 cells was associated with an increase in mtROS, whereas Mito-TEMPO effectively decreased non-canonical Pyroptosis and the expression of GSDMB. These findings suggest that GSDMB plays a role in AAA macrophage non-canonical Pyroptosis, which influences the phenotypic transformation and Apoptosis of HASMCs. The mtROS-Dynamin-Related Protein 1 (Drp1) axis is likely to regulate the GSDMB-mediated non-canonical Pyroptosis.

Keywords

Abdominal aortic aneurysm; GSDMB; Macrophage; Non-canonical pyroptosis.

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