Exosome-Derived From Sepsis Patients' Blood Promoted Pyroptosis of Cardiomyocytes by Regulating miR-885-5p/HMBOX1

Frontiers in Cardiovascular Medicine

article

Guo-wei Tu¹  Jie-fei Ma¹  Jia-kun Li¹  Ying Su¹  Jing-chao Luo¹  Guang-wei Hao¹  Ming-hao Luo³  Yi-rui Cao⁴  Yi Zhang⁴  Zhe Luo¹ 

[1] Department of Critical Care Medicine, Zhongshan Hospital, Fudan University;Department of Critical Care Medicine, Xiamen Branch, Zhongshan Hospital, Fudan University;Shanghai Medical College, Fudan University;Shanghai Key Laboratory of Organ Transplantation;Biomedical Research Center, Institute for Clinical Sciences, Zhongshan Hospital, Fudan University;Shanghai Key Laboratory of Lung Inflammation and Injury

关键词: sepsis;    exosomes;    pyroptosis;    cardiomyocytes;    microRNA;   

DOI  :  10.3389/fcvm.2022.774193

学科分类：地球科学(综合)

来源: Frontiers

【 摘 要 】

Background Septic myocardial depression has been associated with increased morbidity and mortality. miR-885-5p has been shown to regulate cell growth, senescence, and/or apoptosis. Published studies demonstrated that Homeobox-containing protein 1 (HMBOX1) inhibits inflammatory response, regulates cell autophagy, and apoptosis. However, the role of miR-885-5p/HMBOX1 in sepsis and septic myocardial depression and the underlying mechanism is not fully understood. Materials and Methods Exosomes (exos) derived from sepsis patients (sepsis-exos) were isolated using ultracentrifugation. Rats were subjected to cecal ligation and puncture surgery and treated with sepsis-exos. HMBOX1 was knocked down or overexpressed in AC16 cells using lentiviral plasmids carrying short interfering RNAs targeting human HMBOX1 or carrying HMBOX1 cDNA. Cell pyroptosis was measured by flow cytometry. The secretion of IL-1β and IL-18 was examined by ELISA kits. Quantitative polymerase chain reaction (PCR) or western blot was used for gene expression. Results Sepsis-exos increased the level of miR-885-5p, decreased HMBOX1, elevated IL-1β and IL-18, and promoted pyroptosis in AC16 cells. Septic rats treated with sepsis-exos increased the serum inflammatory cytokines is associated with increased pyroptosis-related proteins of hearts. MiR-885-5p bound to the three prime untranslated regions of HMBOX1 to negatively regulate its expression. Overexpressing HMBOX1 reversed miR-885-5p-induced elevation of inflammatory cytokines and upregulation of NLRP3, caspase-1, and GSDMD-N in AC16 cells. The mechanistic study indicated that the effect of HMBOX1 was NF-κB dependent. Conclusion Sepsis-exos promoted the pyroptosis of AC16 cells through miR-885-5p via HMBOX1. The results show the significance of the miR-885-5p/HMBOX1 axis in myocardial cell pyroptosis and provide new directions for the treatment of septic myocardial depression.

【 授权许可】

CC BY