PUMA在大鼠胰腺移植缺血再灌注损伤中的意义
【摘要】 目的:探讨PUMA在移植胰腺缺血再灌注损伤(I/RI)中的早期促凋亡作用。方法:对封闭群大鼠建立大鼠腔静脉内分泌引流、肠道外分泌引流的动物模型.再灌注后第0、1、2、3、4、6、9、12 h等时点,每时点处死5只大鼠,切取移植胰腺,石蜡包埋切片,原位DNA缺口末端标记(TUNEL)法测定胰腺组织细胞凋亡, Western blot方法测定移植胰腺组织PUMA,bcl2、bax、caspase3蛋白表达。结果:再灌注术后第0、1、2、3、4、6、9、12 h,胰腺细胞凋亡数分别为(29.42±4.93)、(47.65±6.43)、(74.80±9.73)、(106.35±16.80)、(148.71±19.50)、(123.96±15.54)、(97.32±10.60)和(57.42±9.56)个/高倍视野。各时点均显著高于正常胰腺(23.48±4.26)。第4小时细胞凋亡数明显增高,12 h降低到最低值,不同组细胞凋亡数的差异有统计学意义(P<0.01);PUMA以及其下游的bax和caspase8蛋白表达在第4小时达到最高峰,12 h降低到最高值,bcl2在第4小时达到最低值,蛋白表达差异均有统计学意义(P<0.05),以后逐渐升高,12 h降低到最低值,PUMA表达与各时点的细胞凋亡数有明显的正相关(r=1.00,P<0.05)。结论:I/RI后细胞早期凋亡与PUMA活化有关,PUMA是通过调节下游bax、caspase8、bcl2基因发挥凋亡促进作用。
【关键词】 胰腺移植; 缺血再灌注损伤;凋亡;PUMA蛋白;大鼠法律论文发表
[ABSTRACT] Objective: To study the proapoptosis effect of P53 upregulated modulator of apoptosis (PUMA) protein on ischemiareperfusion injury of rats stimulated during pancreatic transplantation.Methods: Rat models of pancreatic transplantation with venacava drainage and enteric drainage were established firstly. Then 5 animals in each group were sacrificed respectively at different time points including 0, 1, 2, 3, 4, 6, 9 and12 h after reperfusion, with pancreatic grafts being removed for apoptosic analysis by using DNA nick end labeling technique and protein expression analysis of PUMA, bcl2, bax and caspase3 by using western blot method. Results: Under high power field, the numbers of apoptosic cells in pancreatic grafts at each time point was 29.42 ±4.93, 47.65 ±6.43, 74.8 ±9.73, 106.35 ±16.8, 148.71 ±19.50, 123.96 ±15.54, 97.32 ±10.6 and 57.42 ±9.56, respectively which are all significantly higher than the number in normal pancreatic tissues (23.48 ±4.26). It indicated the numbers were obviously increased at 4h after profusion while decreased to the minimum at 12h with significant difference among each group (P<0.01). The expression of PUMA, bax and caspase3 all started to upregulated at 1h after profusion and increased to maximum at 4h, then gradually decreased to minimum at 12h. While for bcl2, the expression started to downregulated at 1h after profusion and decreased to the minimum at 4h, then gradually increased to maximum at 12h. There are significant differences among the protein expression (P<0.05). Besides, the PUMA expression is positively correlated to the number of apoptosic cells. (r=1.00, P<0.05). Conclusion: Cell apoptosis in ischemiareperfusion injury is highly correlated to the activation of PUMA. The proapoptosis effect of PUMA is generated by regulating bax, caspase8 and bcl2.法律论文发表
[KEY WORDS] Pancreas transplantation; Ischemiareperfusion injury; Apoptosis; PUMA protein; Wistar
近年来大量研究表明,细胞凋亡是器官移植缺血再灌注损伤( ischemiareperfusioninjury, I/RI)的早期事件[1],但细胞发生凋亡的机制不明。PUMA(p53 upregulated modulator of apoptosis)是2001年发现的p53下游促凋亡基因,是bcl2家族BH3亚家族中的成员,PUMA在受到p53缺氧、放射、化疗等刺激信号下迅速被激活,从而导致PUMA下游bcl2家族基因的活性改变,引起细胞色素C的释放和Caspase酶的活化,最终导致细胞凋亡[2,3]。本研究应用大鼠胰腺、十二指肠移植模型, 探讨PUMA在大鼠胰腺、十二指肠移植I/RI中的早期凋亡促进作用。
1 材料与方法法律论文发表
1.1 实验动物
43只(对照组3只)清洁级封闭群SD大鼠(供体), 体质量250~300 g ,雄性;清洁级封闭群Wistar大鼠, 40只,体质量300~350 g, 雄性, 均由上海实验动物中心提供。
1.2 主要试剂
鼠抗人PUMA多克隆抗体购自Cell Signals公司,兔抗鼠bcl2 、bax、 caspase3、Actin多克隆抗体和Western bloting试剂购自Santa Cru公司,细胞凋亡检测试剂盒购南京建成生物工程研究所。
1.3 大鼠胰腺移植动物模型的制备法律论文发表
见文献[4]。
1.4 移植模型的分组和处理
移植模型共分为8组,每组5只;各组大鼠于胰腺再
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