Affiliation:
1. Shanghai Frontiers Science Research Base of Exercise and Metabolic Health, The Key Laboratory of Exercise and Health Sciences of Ministry of Education Shanghai University of Sport Shanghai China
2. Department of Physiology Navy Medical University Shanghai China
3. Department of Anesthesiology and Surgical Intensive Care Unit, Xinhua Hospital Shanghai Jiaotong University School of Medicine Shanghai China
Abstract
AbstractAimExercise training exerts protective effects against sepsis‐associated multiple organ dysfunction. This study aimed to investigate whether aerobic exercise protected against sepsis‐associated acute kidney injury (AKI) via modulating R‐spondin 3 (RSPO3) expression.MethodsTo investigate the effects of aerobic exercise on lipopolysaccharide (LPS)‐induced AKI, LPS (20 mg/kg) was intraperitoneally injected after six weeks of treadmill training. To investigate the role of RSPO3 in LPS‐induced AKI, wild‐type (WT) or inducible endothelial cell‐specific RSPO3 knockout (RSPO3EC−/−) mice were intraperitoneally injected with 12 mg/kg LPS. RSPO3 was intraperitoneally injected 30 min before LPS treatment.ResultsAerobic exercise‐trained mice were more resistant to LPS‐induced body weight loss and hypothermia and had a significant higher survival rate than sedentary mice exposed to LPS. Exercise training restored the LPS‐induced decreases in serum and renal RSPO3 levels. Exercise or RSPO3 attenuated, whereas inducible endothelial cell‐specific RSPO3 knockout exacerbated LPS‐induced renal glycocalyx loss, endothelial hyperpermeability, inflammation, and AKI. Bioinformatics analysis results revealed significant increases in the expression of matrix metalloproteinases (MMPs) in kidney tissues of mice exposed to sepsis or endotoxaemia, which was validated in renal tissue from LPS‐exposed mice and LPS‐treated human microvascular endothelial cells (HMVECs). Both RSPO3 and MMPs inhibitor restored LPS‐induced downregulation of tight junction protein, adherens junction protein, and glycocalyx components, thus ameliorating LPS‐induced endothelial leakage. Exercise or RSPO3 reversed LPS‐induced upregulation of MMPs in renal tissues.ConclusionIncreased renal expression of RSPO3 contributes to aerobic exercise‐induced protection against LPS‐induced renal endothelial hyperpermeability and AKI by suppressing MMPs‐mediated disruption of glycocalyx and tight and adherens junctions.