胃癌中NF-кB与COX-2表达的研究

目的探讨NF-кB、COX-2的表达与胃癌的关系及临床意义。方法采用免疫组织化学方法(S-P法)对胃癌组织、正常胃黏膜中NF-кB p65及COX-2蛋白表达进行检测。结果 NF-кB p65蛋白和COX-2蛋白在胃癌组织中的阳性表达率分别为67%和60%,正常胃黏膜中的阳性表达率分别为21%和18%,2者比较均有显著性差异(P均<0.01)。在低分化组的阳性表达率分别为79%和72%,高/中分化组的阳性表达率分别为53%和47%,2者比较均有显著性差异(P均<0.05);在浸润深度为T3+T4组的阳性表达率分别为73%和66%,T1+T2组的阳性表达率分别为22%和22%,2者比较均有显著性差异(P<0.01);在临床Ⅲ～Ⅳ期组的阳性表达率分别为78%和74%,Ⅰ～Ⅱ期组的阳性表达率分别为48%和37%,2者比较均有显著性差异(P均<0.01)。不同性别、年龄、肿瘤部位及大体分型胃癌组织中NF-кB p65和COX-2蛋白的表达无显著性差异(P均>0.05)。胃癌组织中NF-кB p65和COX-2蛋白的表达呈明显正相关(rs=0.539,P<0.01)。结论胃癌组织中的NF-кB和COX-2表达增高,提示其与胃癌的发生、发展、侵袭、淋巴转移密切相关。

NF-кB与COX-2在胃癌及转移淋巴结中的表达研究

目的:探讨NF-кB与COX-2在胃癌原发灶及淋巴结转移灶中的表达关系及临床意义。方法:采用免疫组织化学方法(S-P法)对胃癌原发灶,第一站淋巴结转移灶中的NF-кBp65及COX-2蛋白表达进行检测。结果:胃癌组织中NF-кBp65和COX-2蛋白表达在有淋巴结转移组的阳性表达率分别为79.55%和72.73%,大于无淋巴结转移组48.28%和41.38%,二者比较差异有显著性(P<0.01);NF-кBp65及COX-2蛋白在第一站淋巴结转移灶中的阳性表达率分别为95.45%和88.64%,高于胃癌原发灶81.82%和70.45%,两者比较差异有显著性(P<0.05)。结论:NF-кB和COX-2对于胃癌可能是一个与转移相关因子,通过调节相应的基因共同参与了胃癌的淋巴转移。

Overexpression of angiopoietin-1 reduces doxorubicin-induced apoptosis in cardiomyocytes

Doxorubicin （Dox） is a major anticancer chemotherapeutic agent. However, it causes cardiomyopathy due to the side effect of cardiomyocyte apoptosis. We have previously reported that angiopoietin-1 significantly reduced myocardial infarction after ischemic injury and protected cardiomyocytes from oxidative stress-induced apoptosis. It is hypothesized that angiopoietin-1 may protect cardiomyocytes from Dox-induced apoptosis. Cardiomyocytes H9C2 were transfected with adenovirus expressing angiopoietin-1 （Ad5-Ang-1） 24 h before the cells were chal- lenged with Dox at a concentration of 2 ~tmol/L. Ad5-GFP served as the vector control. Cardiomyocyte apoptosis was evaluated using Annexin V-FITC staining and caspase-3 and caspase-8 activity was determined by Western blotting. The results showed that Dox treatment significantly induced cardiomyocyte apoptosis as evidenced by the greater number of Annexin V-FITC stained cells and increases in caspase-3 and caspase-8 activity. In contrast, overexpression of angiopoietin-1 significantly prevented Dox-induced cardiomyocyte apoptosis. To elucidate the mechanisms by which angiopoietin-1 protected cells from Dox-induced apoptosis, we analyzed both extrinsic and intrinsic apoptotic signaling pathways. We observed that angiopoietin-1 prevented Dox-induced activation of both extrinsic and intrinsic apoptotic signaling pathways. Specifically, angiopoietin-1 prevented DOX-induced in- creases in FasL and Bax levels and cleaved caspase-3 and caspase-8 levels in H9C2 cells. In addition, overexpres- sion of angiopoietin-1 also activated the pro-survival phosphoinositide-3 kinase （PI3K）/Akt signaling pathway and decreased Dox-induced nuclear factor-kappaB （NF-~：B） activation. Our data suggest that promoting the expression of angiopoietin-1 could be a potential approach for reducing Dox-induced cardiomyocyte cytoxicity.

IgA肾病肾组织中NF-κB表达与病理损伤的相关性

目的探讨IgA肾病(IgAN)肾穿刺组织中核转录因子-κB(NF-κB)的表达及其与免疫活动性的关系。方法整理60例原发性IgAN患者的临床及病理资料,依据IgA肾病Lee分级方法,计算组织学活动指数(AI);免疫组化法检测肾组织中NF-κB、疾病活动指标增殖细胞核抗原(PCNA)的表达水平,并进行半定量评分,观察肾组织NF-κB表达与PCNA表达的相关关系。结果 NF-κB表达与PCNA表达与IgA肾病患者尿蛋白定量、尿红细胞数呈正相关(P<0.05)。结论 NF-κB在IgAN患者肾组织中的表达与IgAN肾病的免疫活动相关。