RIP2 inhibition alleviates lipopolysaccharide-induced septic cardiomyopathy via regulating TAK1 signaling

• Published in: European journal of pharmacology 2023-05, Vol.947, p.175679-175679, Article 175679
• Main Authors: Lin, Zheng, Liao, Hai-Han, Zhou, Zi-Ying, Zhang, Nan, Li, Wen-Jing, Tang, Qi-Zhu
• Format: Article
• Language: English
• Subjects: Animals; Cardiomyopathies - chemically induced; Cardiomyopathies - drug therapy; Inflammatory responses; Lipopolysaccharides; Mice; Mice, Knockout; NF-kappa B - metabolism; Rats; Receptor-Interacting Protein Serine-Threonine Kinase 2 - metabolism; RIP2; Sepsis cardiomyopathy; Signal Transduction; TAK1
• ISSN: 0014-2999; 1879-0712
• DOI: 10.1016/j.ejphar.2023.175679

RIP2 is a member of the receptor-interacting protein family that has been associated with various pathophysiological processes, including immunity, apoptosis, and autophagy. However, no studies have hitherto reported the role of RIP2 in lipopolysaccharide (LPS)-induced septic cardiomyopathy (SCM). This study was designed to illustrate the role of RIP2 in LPS-induced SCM. C57 and RIP2 knockout mice received intraperitoneal injections of LPS to establish models of SCM. Echocardiography was used to assess the cardiac function of the mice. Real-time-PCR, cytometric bead array and immunohistochemical staining were used to detect the inflammatory response. Immunoblotting was used to determine the protein expression of relevant signaling pathways. Our findings were validated by treatment with a RIP2 inhibitor. Neonatal rats cardiomyocytes (NRCMs) and cardiac fibroblasts (CFs) were transfected with Ad-RIP2 to further explore the role of RIP2 in vitro. RIP2 expression was upregulated in our mice models of septic cardiomyopathy and LPS-stimulated cardiomyocytes and fibroblasts. RIP2 knockout or RIP2 inhibitors attenuated LPS-induced cardiac dysfunction and reduced the inflammatory response in mice. Overexpression of RIP2 in vitro enhanced the inflammatory response, and TAK1 inhibitors attenuated the inflammatory response caused by overexpression of RIP2. Our findings substantiate that RIP2 induces an inflammatory response by regulating the TAK1/IκBα/NF-κB signaling pathway. RIP2 inhibition by genetic or pharmacological approaches has huge prospects for application as a potential treatment strategy for inhibiting inflammation, alleviating cardiac dysfunction, and improving survival. The effect of RIP2 in septic cardiomyopathy. LPS treatment increases cardiac RIP2 expression. Elevated RIP2 induces the overproduction of inflammatory factors through activation of the TAK1/NF-κB pathway. RIP2 inhibition could alleviate LPS-induced cardiac impairment by blocking the TAK1/NF-κB signaling. [Display omitted]