Fibronectin Type III Domain Containing 5 Alleviates the Inflammation and Apoptosis in Lipopolysaccharide-Induced Intestinal Epithelial Cells

Intestinal injury caused by sepsis has multiple effects on the pathophysiology and development of sepsis. In this study, we aimed to explore the role of FNDC5 in progression of sepsis-induced intestinal injury. The expression of FNDC5 in blood samples of patients with sepsis-induced intestinal injury and IEC-6 cells was measured by qRT-PCR assay. Cell viability and inflammatory cytokines were evaluated by CCK-8 and ELISA assay, respectively. Oxidative stress level was detected by DCFH-DA staining and corresponding kit. Tunel assay and western blot analysis were performed to assess cell apoptosis. FNDC5 expression in patients with sepsis-induced intestinal injury was significantly decreased. The stimulation of LPS reduced expression level of FNDC5 and inhibited cell growth in IEC-6 cells. Overexpression of FNDC5 suppressed the productions of TNF-a, L-1 beta, IL-6 and MCP1, diminished the level of ROS and MPO while enhanced the SOD activity. Additionally, upregulation of FNDC5 ameliorated cell apoptosis and repressed the levels of apoptosis-related proteins. FNDC5 could play a crucial role in the inflammation, oxidative stress and apoptosis in sepsis-induced intestinal injury.