KH-type splicing regulatory protein mediate inflammatory response in gastric epithelial cells induced by lipopolysaccharide

To study differential expressions of KH-type splicing regulatory protein (KSRP) and inflammatory factors and to explore the relationship between them in Lipopolysaccharide (LPS)-induced gastric epithelial cells (GES-1), cells were exposed to LPS for 24h in the presence or absence of SC-514. Western blot and real-time PCR (RT-PCR) were used to analysis the contents of KSRP, inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2). The results showed that LPS decreased the expression of KSRP protein in GES-1 cells, but not KSRP mRNA, while increasing the levels of iNOS and COX-2 proteins and mRNAs in GES-1cells. High expression of KSRP induced low expressions and stabilities of iNOS and COX-2 in GES-1 cells, indicated that KSRP protein presented negative correlation with iNOS and COX-2 with LPS stimulation. In conclusion, the regulation of expression of KSRP was mainly achieved through post-translational modification. KSRP protein participated in regulating the expression of iNOS and COX-2 in their transcription and translation levels. In response to LPS or gram negative pathogenic microorganism, KSRP could regulate Toll-like receptor (TLR)/ Nuclear factor-kappa B (NF-B) signal pathway in GES-1 cells.