cFLIP和caspase-8在犬胆道良性损伤修复过程中的表达

目的:观察凋亡调控蛋白FLICE样抑制蛋白(FLICE-like inhibitory protein,c-FLIP)及其下游凋亡因子caspase-8在胆道损伤愈合良性狭窄形成过程中的表达和定位.方法:建立胆管损伤后良性狭窄犬模型,利用采用免疫组织化学SABC法分别对15例犬胆道损伤后2、3、4、5、6 mo及其配对的15例假手术组的吻合口组织中c-FLIPTLcaspase-8表达和定位进行分析,根据染色细胞的比例,计算每张切片的平均吸光度值,分别比较cFLIP及caspase-8在实验组及其配对的假手术组胆道吻合口组织表达的差异,及两组内不同时相之间c-FLIP及caspase-8在吻合口组织表达的差异.结果:c-FLIP蛋白于实验组内各时间点均呈阳性表达,定位于问质细胞,以成纤维细胞胞质最明显,各时间点内实验组与对照组比较有显著性差异(22.33±3.40 vs 3.41±0.69,21.01±5.43 vs 3.28±0.95,18.93±2.54 vs 3.11±1.01,18.88±3.40 vs 3.35±0.74,17.23±3.53vs 3.19±0.91,均P<0.05).而各时间点之间无显著性差异(P>0.05).caspase-8于实验组各时相均呈现弱表达,定位以腺上皮居多,间质组织表达相对较弱,与配对之对照组比较均差异显著(3.20±0.86 vs 11.66±2.80,3.42±1.17 vs10.16±3.08,3.65±0.90 vs 10.03±1.93,3.91±0.71 vs 10.90±4.02.4.01±0.88 vs 11.23±2.73,P<0.05),而各时间点之间亦无显著性差异(P>0.05).c-FLIP与caspase-8蛋白表达成负相关(r=-0.94,P<0.05).结论:cFLIP可能通过抑制caspase-8的激活在胆道良性狭窄形成过程中发挥了其抗凋亡的作用.

Expression of c-FLIP and caspase-8 during the formation of canine benign biliary strictures after bile duct injury

AIM:To investigate the expression and localization of apoptosis-regulatory protein cellular FLICE-like inhibitory protein (cFLIP) and its downstream apoptotic factor caspase-8 in the formation of benign biliary strictures after bile duct injury.METHODS:An animal model of benign biliary strictures was established in dogs by inducing bile duct injury.Tissue specimens were taken from the anastomotic sites created in 15 model dogs (experimental group) and 15 matched sham-operated dogs (control group) at 2,3,4,5...