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Peng, Yue; Yang, Qingchen; Gao, Shuya; Liu, Zekun; Kong, Weixian; Bian, Xiaohong; Li, Zhe; Ye, Junmei
Biochemical and biophysical research communications, 05/2022, Volume: 603Journal Article
Pro-inflammatory cytokines play important roles in sepsis-induced cardiac injury. Among various cytokines, the function of Interleukin-6 (IL-6) in the regulation of cardiomyocyte injury remains to be elucidated. This study aimed to investigate whether IL-6 plays a key role in the sepsis-induced cardiomyocyte injury and the possible mechanism. Mice deficient for Il-6 exhibited impaired heart rhythm after LPS stimulation. Histological analysis revealed significantly increased oxidative stress after LPS stimulation in the heart with Il-6 knockout. On the contrary, IL-6 supplementation alleviated LPS-induced oxidative stress. Mechanically, IL-6 facilitates Nrf2 expression and its nucleus translocation, which subsequently promotes the expression of antioxidant genes and sustains redox homeostasis in cardiomyocytes, and Nrf2 deletion results in elevated oxidative stress during LPS stimulation and cannot be inverted by IL-6 supplement. Our study presents a new sight for the protective role of IL-6 during the pathological development of LPS-induced cardiac injury, which functions as an anti-oxidant molecule via activating Nrf2 signaling. Display omitted •Oxidative stress is a main cause of cardiac dysfunction during LPS stimulation.•Moderate concentration of IL-6 protects the heart against LPS-induced sepsis.•IL-6 suppresses oxidative stress via upregulating Nrf2 signaling in cardiomyocytes.•Nrf2 diminishes LPS-induce oxidative stress in cardiomyocytes.
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