Effect of echinacoside intervention on liver and pancreas injury in rats with acute pancreatitis and its mechanism
Objective To investigate the effect and mechanism of echinacoside(ECH)in improving liver injury in rats with acute pancreatitis by establishing a rat model of acute pancreatitis and liver injury.Methods A total of 24 Sprague-Dawley rats were randomly divided into blank group(Con group),control group(Con+ECH group),acute pancreatitis group(AP group),and acute pancreatitis+ ECH intervention(AP+ECH group).The rats were given intraperitoneal injection of 10 mg/kg ECH on day 7 before the establishment of the model of acute pancreatitis;at 24 hours after the last administration of cerulein,blood samples were collected via the abdominal aorta,and serum was separated for biochemical analysis including alanine aminotransferase(ALT),aspartate aminotransferase(AST),lactate dehydrogenase(LDH),gamma-glutamyl transpeptidase(GGT),alkaline phosphatase(ALP),albumin(Alb),total bilirubin(TBil),cholinesterase,blood amylase(Amy),and lipase(LPS).HE staining was used to observe the histopathological changes of the pancreas and the liver;transmission electron microscopy(TEM)was used to observe the microstructural changes of pancreas and liver tissue;ELISA was used to measure the levels of interleukin-1β(IL-1β),interleukin-16(IL-6),tumor necrosis factor-α(TNF-α),and interleukin-10(IL-10)in liver tissue homogenate;immunohistochemistry was used to measure the levels of TNF-α and p-p65 NF-κB in pancreas and liver tissue;Western blot was used to measure the expression levels of NF-κB pathway proteins in liver tissue.A one-way analysis of variance was used for comparison of continuous data between multiple groups,and the SNK test or the Dunnett's T3 method was used for further comparison between two groups.Results Compared with the Con group,the AP group had significant increases in ALT,AST,GGT,LDH,ALP,TBil,Amy,and LPS(all P<0.01),as well as significant increases in the levels of IL-1β,IL-6,IL-10,and TNF-α in liver tissue homogenate(all P<0.01).ECH intervention reduced the levels of ALT,AST,GGT,LDH,ALP,TBil,AMY,and LPS and inhibited the secretion of IL-1β,IL-6,and TNF-α in rats with acute pancreatitis.HE staining showed that ECH intervention alleviated the vacuolar degeneration of acinar cells,inflammatory cell infiltration in pancreatic tissue,and the necrosis of hepatocytes compared with the AP group.TEM showed that compared with the AP group,there was a reduction in the degree of mitochondrial swelling in liver and pancreatic cells after ECH intervention.ECH intervention partially reversed the elevated expression levels of p-p65 NF-κB and TNF-α in liver and pancreatic tissue.In addition,the expression levels of MyD88,p-IκBα,p-IKKα,and p-p65 were upregulated in liver tissue of rats with acute pancreatitis,which could be partially reversed after ECH intervention.Conclusion Echinacoside can alleviate liver and pancreatic injury induced by acute pancreatitis by inhibiting the TLR4/MyD88/NF-κB pathway.
EchinacosidePancreatitisRats,Sprague-DawleyNF-kappa B
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