Effects of IL-10 on serum TNF-α and pancreatic tissue in rats with severe acute pancreatitis / 中华肝胆外科杂志

ABSTRACT

Objective To investigate the effects of recombinant human interleukin-10 (IL-10) on serum tumor necrosis factor α (TNF-α) and histopathological changes of pancreas in rats with severe acute pancreatitis (SAP),and provide theorical basis for SAP clinical treatment.Methods 90 Sprague-Dawley (SD) rats were randomly divided into three groupsnormal control group (group N,n =30),SAP group (group S,n =30) and IL-10 interference group (group Ⅰ,n =30).5％ sodium taurocholate was retrogradely injected into the pancreatic duct in S group and Ⅰ group to induce SAP model.Rats in N group whose pancreas was just flipped and stricken gently without injection.Group Ⅰ was treated with 10 000 units of intraperitioneal recombinant human IL-10 at 1,3 and 5 h.Group N and group S received three intraperitoneal injections of 0.9％ normal saline at the same time points.Rats were killed at 6,12 and 24 h.The level of TNF-α in serum was determined by enzyme-linked immunosorbent assay (ELISA),and the level of amylase was assayed by biochemical methods.The pancreas histological changes were observed by H-E staining.Results Compared with group N [serum amylase (1 025.3 ±326.9),(999.9 ±212.3),(962.3 ± 128.9) IU/L;TNF-α (55.6 ± 2.1),(56.1 ± 2.2),(58.7 ± 1.3) ng/L;pancreatic histopathological score 0.13 ±0.11,0.15 ±0.12,0.16 ±0.15],serum amylase (6 633.9 ±846.7),(9421.4 ± 1 031.8),(8 755.6 ± 734.5) IU/L,TNF-α (87.6 ± 3.3),(113.3 ± 10.2),(100.2 ± 2.3) ng/L and pancreatic histopathological score (8.58 ± 0.63,13.41 ± 0.79,16.78 ± 0.87) in group S were increased significantly at 6,12 and 24 h (P ＜ 0.05).The pancreatic damage at 24 h was the most severe,and the peak concentration of AMY and TNF-α reached at 12 h.Compared with group S,pancreatic histopathological scores 6.52 ± 0.54,9.37 ± 0.35,12.43 ± 0.69,the level of serum amylase (6 032.8 ± 534.9),(7 475.8 ± 834.2),(6903.4 ±377.1) IU/L and TNF-α (67.5 ±2.5),(93.0 ±4.9),(86.7 ±6.6) ng/L in group Ⅰ were significantly decreased at corresponding time points (P ＜ 0.05).Conclusions Early application of recombinant human IL-10 can attenuate SAP inflammatory response and relieve the histopathological injury of pancreas by inhibiting the release of TNF-α.IL-10 can be used for the treatment of SAP.