71%;大肠癌微淋巴管密度(microlymphatic density,MLD)显著高于正常大肠组织(t=3.624,P<0.01)。结论大肠癌β-catenin异位表达可能是诱导大肠癌淋巴管生成的重要原因。
目的探讨舒芬太尼后处理对在体大鼠心肌缺血再灌注损伤的影响。方法健康雄性SD大鼠经结扎冠状动脉左前降支制备心肌缺血再灌注损伤模型后随机分为8组:假手术(A)组:只穿线,不结扎;缺血再灌注(B)组:缺血30min,再灌注120

min,再灌注前5 min单次静脉注射生理盐水1 ml;缺血后处理(C)组:缺血30 min末行缺血10 s,再灌注10 s,重复3次后再灌注120 min;舒芬太尼后处理(D～H)组:再灌注前5 min分别单次静脉注射舒芬太尼0.1、0.3、1、3、10μg/kg,5 min后再灌注120 min。于结扎线缝好后平衡30 min(T0)、缺血30 min末(T1)、后处理末(T2)、再灌注120min末(T3)记录血流动力学参数。计算心肌梗死面积(IS)与缺血危险区(AAR)比值(IS/AAR)。选取A、B、C、最佳剂量舒芬太尼后处理组于T3时取颈动脉血2 ml,采用硫代巴比妥酸(TBA)法测定丙二醛(MDA)浓度,黄嘌呤氧化酶法测定超氧化物歧化酶(SOD)活性。结果与B组比较,C、E、F、G、H组IS/AAR降低(P<0.05);与B组比较,C、F组MDA降低,SOD活性升高(P<0.05)。结论舒芬太尼可模拟缺血后处理减轻在体大鼠心肌缺血再灌注损伤,并且呈剂量依赖性。
Reperfusion therapy must be applied as soon as possible to attenuate 也许 the ischemic insult of acute myocardial infarction(AMI).However reperfusion is responsible for additional myocardial damage,which likely involves opening of the mitochondrial permeability transition pore(mPTP).In reperfusion injury,mitochondrial damage is a determining factor in causing loss of cardiomyocyte function and viability.Major mechanisms of mitochondrial dysfunction include the long lasting opening of mPTPs and selleck产品 the oxidative stress resulting from formation of reactive oxygen species(ROS).Several signaling cardioprotective pathways are activated by stimuli such as preconditioning and postconditioning,obtained with brief intermittent

ischemia or with pharmacological agents.These pathways converge on a common target,the mitochondria,to preserve their function after ischemia/reperfusion.The present review discusses the role of mitochondria in cardioprotection,especially the involvement of adenosine triphosphate-dependent potassium channels,ROS signaling,and the mPTP.Ischemic postconditioning has emerged as a new way to target the mitochondria,and to drastically reduce lethal reperfusion injury.Several clinical studies using ischemic postconditioning during

angioplasty now support its protective effects,and an interesting alternative is pharmacological postconditioning.In fact ischemic postconditioning and the mPTP desensitizer,cyclosporine A,have been shown to induce comparable protection in AMI patients.
目的探讨Wnt/β-catenin信号通路在胚胎癌细胞增殖中的作用及其机制。方法取小鼠胚胎癌细胞系P19进行传代培养,将细胞分为正常对照组(Con组)、添加反式维甲酸组(RA组)、添加GSK-3β特异性抑制剂SB216763组(SB组)和添加SB216763+RA组(SB+RA组)四组。采用免疫荧光染色、RT-PCR和Western GSK1210151A分子量 blot-ting法分别检测细胞中β-catenin、Oct4及C-myc的表达状况;通过BrdU标记与MTT法检测细胞的增殖。结果 加入SB216763可促进P19细胞β-catenin入核,同时促进Oct4和C-myc基因的表达,阻断RA诱导的细胞分化,并可明显促进细胞增殖。结论 激活Wnt/β-catenin信号通路可促进胚胎癌细胞P19的增殖并抑制分化,其作用机制可能是通过上调C-myc基因表达来实现的。
目的:研究脑缺血预处理(CIPC)中氯化锂对PI3K/AKT/GSK3β信号通路调节变化及影响。方法:制作脑缺血、CIPC及氯化锂干预模型,进行神经功能缺损评分;TTC法脑组织染色计算脑梗死体积;应用Western blotting检测AKT、p-AKT、GSK-3β、p-GSK-3β(ser9)、Mcl-1的蛋白表达。结果:与脑缺血组比较,氯化锂组及CIPC组p-AKT、Mcl-1、p-GSK-3β(ser9)的蛋白表达均增高,神经功能缺损评分及脑梗死体积降低(P<0.05);与CIPC组比较,氯化锂组进一步提高了p-AKT、Mcl-1、p-GSK-3β(ser9)的蛋白表达、降低了神经功能缺损评分及脑梗死体积(P<0.