LncRNA HOTAIR Promotes LPS-Induced Inflammation and Apoptosis of Cardiomyocytes via Lin28-Mediated PDCD4 Stability

• Published in: Inflammation Vol. 44; no. 4; pp. 1452 - 1463
• Main Authors: Ni, Shu-Yuan, Xu, Wen-Ting, Liao, Guang-Yuan, Wang, Yin-Ling, Li, Jing
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2021; Springer Nature B.V
• Subjects: Animals; Apoptosis; Apoptosis - drug effects; Apoptosis - physiology; Apoptosis Regulatory Proteins - biosynthesis; Biomedical and Life Sciences; Biomedicine; Cardiac function; Cardiomyocytes; Cardiomyopathy; Echocardiography; Enzyme-linked immunosorbent assay; Flow cytometry; Gene Knockdown Techniques - methods; Heart; IL-1β; Immunology; Inflammation; Inflammation - chemically induced; Inflammation - metabolism; Inflammation - pathology; Intensive care units; Interleukin 6; Internal Medicine; Lipopolysaccharides; Lipopolysaccharides - toxicity; Mice; Mice, Inbred C57BL; Myocytes, Cardiac - drug effects; Myocytes, Cardiac - metabolism; Myocytes, Cardiac - pathology; Original Article; Pathology; Pharmacology/Toxicology; Protein Stability - drug effects; Rheumatology; Ribonucleic acid; RNA; RNA, Long Noncoding - antagonists & inhibitors; RNA, Long Noncoding - biosynthesis; RNA-binding protein; RNA-Binding Proteins - biosynthesis; Sepsis; Transfection; Tumor necrosis factor-α; HOTAIR; PDCD4; Sepsis; Cardiomyocytes; Lin28; Apoptosis
• ISSN: 0360-3997; 1573-2576
• DOI: 10.1007/s10753-021-01431-0

Sepsis is one of the primary causes of death in intensive care units. Recently, increasing evidence has identified lncRNA HOTAIR is involved in septic cardiomyopathy. However, the potential mechanism underlying HOTAIR on septic cardiomyopathy is still unknown. H9C2 cells were treated with lipopolysaccharide (LPS) after transfection with sh-HOTAIR, sh-Lin28, pcDNA3.1-HOTAIR, and pcDNA3.1-PDCD4. qRT-PCR was used to examine the level of HOTAIR, Lin28, PDCD4, and sepsis-related inflammatory cytokines. Flow cytometric analysis was applied to detect cell apoptosis. The interaction between Lin28 and HOTAIR or PDCD4 was verified by RNA pull-down and RIP assay. HOTAIR levels were interfered by AAV9-sh-HOTAIR in LPS-induced septic cardiomyopathy mice. ELISA analysis was used to evaluate TNF-α, IL-6, and IL-1β level. Western blot was used to detect the expression of LIN28 and PDCD4 in mouse cardiomyocytes. Echocardiography was used to evaluate the cardiac function. In our study, knockdown of HOTAIR inhibited LPS-induced inflammation and H9C2 cells apoptosis. HOTAIR promoted LPS-induced inflammatory response and apoptosis of H9C2 cells by enhancing PDCD4 stability. RNA pull-down and RIP assay exhibited that Lin28, a highly conserved RNA-binding protein, was combined with HOTAIR and PDCD4. The in vivo experiments verified that the HOTAIR knockdown alleviated the cardiac function injury and secretion of inflammatory factors caused by sepsis. In conclusion, our findings supported that the HOTAIR/Lin28/PDCD4 axis serves as a critical regulator of sepsis, which may open a new direction for the development of sepsis therapeutic.