外源性瘦素对重症急性胰腺炎肝损伤的机制研究

目的：探讨外源性瘦素对重症急性胰腺炎（SAP）大鼠肝损伤的作用机制。方法将30只雄性SD大鼠随机分为假手术组、SAP组、瘦素干预组。采用逆行胰胆管注射3．5％牛黄胆酸钠制作SAP大鼠模型。瘦素干预组大鼠腹腔内注入瘦素20μg／kg。在术后12 h处死各组大鼠，取胰腺、肝脏组织进行HE染色、检测肝脏组织核因子‐κB（NF‐κB），采用细胞凋亡原位缺口末端标记法（TUNEL）测定肝脏组织的细胞凋亡指数，检测丙氨酸氨基转移酶（ALT）、天门冬酸氨基转移酶（AST）及淀粉酶（AMY）水平。结果与假手术组比较，SAP组和瘦素干预组大鼠肝脏组织病理评分均明显增加（P＜0．05）；与SAP组比较，瘦素干预组大鼠肝脏组织病理评分降低（P＜0．05）；肝脏组织NF‐κB表达在SAP组和瘦素干预组较假手术组明显增加（P＜0．01），与SAP组比较，瘦素干预组大鼠NF‐κB表达下降（P＜0．05）。肝细胞凋亡指数SAP组、瘦素干预组大鼠均较假手术组明显增高（P＜0．05），而瘦素干预组较SAP组降低（P＜0．05）。SAP组和瘦素干预组大鼠 ALT、AST、AMY水平较假手术组显著增高（P＜0．05），而瘦素干预组较SAP组降低（P＜0．05）。结论外源性瘦素可能通过降低肝脏组织 NF‐κB的表达而降低肝细胞的凋亡指数起到保护SAP并发的肝损害作用。

Protective effects of exogenous leptin on liver injury induced by severe acute pancreatitis

Objective To investigate the effect and mechanism of exogenous leptin on liver injury in severe acute pancreatitis rat .Methods Thirty male SD rats were randomly divided into the sham operation group ,SAP group and leptin intervention group . The SAP rat models was established by retrograde injection of 3 .5% sodium taurocholate into the biliopancreatic duct .The leptin intervention group was intraperitoneally injected with leptin 20 μg/kg .The rats in each group were sacrificed at 12 h after model‐ing .The pancreas and liver tissues were taken for HE staining and detecting the nuclear factor kappa B (NF‐κB) .The cell apoptosis in situ labeling method was adopted for detecting the liver tissue cell apoptosis index .ALT ,AST and AMY were detected . Results Compared with the sham operation group ,the liver tissue pathology score in SAP group and leptin intervention group were significantly increased(P<0 .05) .The liver tissue pathology scores in the leptin intervention group were lower than those in the SAP group(P<0 .05) .The NF‐κB expression of liver tissue in the SAP group and leptin intervention group was obviously increased compared with the sham operation group ,the expression in the leptin intervention group was decreased compared with the SAP group (P<0 .05) .The liver cell apoptosis index in the leptin intervention group and SAP group was significantly higher than that in the sham operation group (P<0 .05) ,and which leptin intervention group was decreased compared with the SAP group (P<0 .05) . The results of ALT ,AST and AMY in the SAP group and leptin intervention group were increased significantly compared with the sham operation group(P<0 .05) ,while which in the leptin intervention group was decreased compared with the SAP group (P<0 .05) .Conclusion The exogenous leptin may play the protective effect on SAP complicating liver damage by lowering the liver tis‐sue NF‐κB expression and reducing the liver cell apoptosis index .