LAUSR

This study aims to explore the effects of tumor necrosis factor alpha-stimulated gene-6 (TSG-6) on vascular inflammatory response and vascular injury in grafted vein wall of rats and its possible mechanism. Vascular grafting model was established by modified cuff. The effect of TSG-6 on the inflammatory response and vascular injury of vein graft was investigated. The activation of mast cells and macrophages after LPS stimulation was observed by lentivirus-mediated upregulation or downregulation of TSG-6 expression. The results showed that rhTSG-6 treatment could significantly inhibit the proliferation of venous bridge, decrease macrophage infiltration and smooth muscle cell proliferation. The expression levels of TNF-α and IL-1 in treated group were significantly lower than that of untreated group (P < 0.05), while the expression of IL-10 in treated group were significantly higher than that of untreated group (P < 0.05). The expression levels of P38, p-P38, JNK and p-JNK in venous bridge of rats were significantly lower than those of untreated rats (P < 0.05), while there was no significant difference in the expression level of ERK and p-ERK (P > 0.05). TSG-6 could inhibit the proliferation of mast cells and macrophages and the release of inflammatory cytokines by down regulating the expression levels of P38, p-P38, JNK and p-JNK. TSG-6 can inhibit the inflammatory response of transplanted vein grafts in rats and reduce vascular injury by downregulation of P38 and JNK signaling pathway.