大黄素与白藜芦醇治疗重症急性胰腺炎的作用机制对比及其展望

Expression characteristic of Toll-like receptor 9 mRNA and protein in conversion of acute edematous to necrotizing pancreatitis in rats

AIM: To observe the changes in mRNA and protein expression of Toll-like receptor (TLR) 9 in the conversion of acute edematous to necrotizing pancreatitis in rats.

METHODS: A SD rat model of acute pancreatitis was established by injecting 5% sodium taurocholate (0.1 mL/100 g, 3 mL/h) into the pancreaticobiliary duct (0 h, 3 h, 6 h and 12 h). The pathological changes in the pancreas were observed by HE staining, and TLR9 mRNA and protein expression was detected by Q-PCR and ELISA, respectively.

RESULTS: Mild pancreatic edema was noted at 3 h, and there was a small number of red blood cells. Edema further aggravated at 6 h and some pancreatic cells showed hemorrhage and necrosis. Pancreatic cell degeneration, edema and necrosis continued to aggrvate at 12 h. TLR9 mRNA and protein expression was significantly increased in acute pancreatitis rats compared with control rats (P < 0.01), and the mRNA levels at 6 h and 12 h were up-regulated compared with that at 3 h (P < 0.01). However, there was no significant difference between 6 h and 12 h in TLR9 mRNA expression (P > 0.05). TLR9 protein reached a peak at 6 h, which was significantly higher than those at 3 h (P < 0.01) and 12 h (P < 0.01).

CONCLUSION: Expression of TLR9 protein is later than the mRNA expression. Pancreatic edema along with TLR9 protein increases to the peak at 6 h, followed by pancreatic tissue necrosis and decreased expression of TLR9 protein. TLR9 may play an important role in the conversion of acute edematous to necrotizing acute pancreatitis .