Bcl-2,bax基因蛋白在乳腺癌中的表达及临床病理学意义

目的检测bcl -2和bax基因蛋白在乳癌中的表达 ,以探讨其在乳癌发生、发展中的作用及其临床病理学意义。方法40例乳癌和 3 1例乳腺良性病变 ,用免疫组化S -P法检测其bcl-2和bax的表达。结果bcl-2基因蛋白在乳癌中心、癌旁、良性病变表达阳性率分别为 72 .5 %( 2 9/ 40 ) ,45 .0 ( 18/ 40 )和 96.8%( 3 0 / 3 1) ( P <0 .0 1) ;按肿瘤细胞分级Ⅰ、Ⅱ、Ⅲ级的bcl -2表达强度分别为 ( 2 .0 8± 0 .2 9) ,( 1.2 3± 0 .2 8)和( 0 .73± 0 .2 3 ) (P <0 .0 1)。bax基因在乳癌中心、癌旁、良性病变中的表达强度分别为 ( 0 .88±0 .13 ) ,( 1.2 0± 0 .10 )和 ( 1.16± 0 .17) (P <0 .0 5 )。结论bcl-2基因蛋白在乳癌中高表达 ,bax基因蛋白则为低表达。说明其细胞凋亡受抑制。bcl-2的高表达可部分反映乳癌的生物学行为和预后良好。

实验性过敏性脑脊髓炎豚鼠脊髓病理学及Bcl-2和Bax蛋白表达的研究

目的:通过观察实验性过敏性脑脊髓炎(EAE)豚鼠脊髓内的病理改变及Bcl-2和Bax蛋白的表达,探讨EAE发病中影响细胞凋亡的机制。方法:采用完全弗氏佐剂和豚鼠脊髓匀浆诱发实验性过敏性脑脊髓炎(EAE)豚鼠模型,动物分别存活14d和28d后取脊髓颈膨大和腰骶膨大段,石蜡切片,HE染色和免疫组化ABC法染色,光镜观察。结果:HE染色发现:除典型的脊髓白质小血管周围的炎性细胞浸润外,在脊髓腹侧静脉、脊髓背侧静脉和沟静脉等较大血管周围也有炎性细胞浸润,28d较14d严重。免疫组化染色发现:模型组脊髓病灶部位和非病灶部位Bcl-2阳性细胞的表达均高于正常组,第28d模型组Bcl-2阳性细胞的表达数目明显高于第14d,模型组Bax阳性细胞的表达比正常组高,在病灶部位Bax的表达第28d高于第14d,而在非病灶部位两个存活期差别不大。结论:实验提示与细胞凋亡密切相关的基因蛋白Bcl-2和Bax参与EAE的发病过程。

大肠癌组织Bax蛋白和Fas抗原表达及意义

应用ABC免疫组化方法研究大肠癌组织中Bax蛋白和Fas抗原表达及其意义。32例大肠癌Bax蛋白和Fas抗原阳性例数分别为16例（50．0％）和17例（53．1％）；高分化腺癌和未转移组癌Bax蛋白和Fas抗原阳性表达率明显低于分化差癌和转移组病。结果提示Bax蛋白和Fas抗原可能是反映大肠癌临床病理特征、生物学行为和预后的重要标记物。

The Expression of Apoptosis-Related Genes Bcl-2 and Bax Protein and Apoptosis Positivity in Cervical Carcinoma during Irradiation

To evaluate the apoptosis positivity, the expression of Bcl-2, bax proteinsin 30 patients with squamous cell cervix carcinoma before and after radiotherapy. Methods: By usingimmuno-histochemical and TDT-dUTP nick end labelling techniques, 30 cases of squamous cell cervicalcarcinoma were analyzed. Results: The apoptosis positivity before and after irradiation was 76.7%and 100% respectively, with the difference being significant (P 【 0.05); The positive rates of Bcl-2protein before and after irradiation were 73.3% and 46.7% respectively, with the difference beingsignificant (P 【 0.05); The positive rates of bax protein before and after irradiation were 86% and100% respectively, with the difference being significant (P 【 0.05). Conclusion: bax and Bcl-2protein play an important role in apoptosis induced by fractionated radiation therapy. Apoptosisinduced by irradiation is contributed to upregulation of bax protein or downregulation of Bcl-2protein.

Connexin 26 correlates with Bcl-xL and Bax proteins expression in colorectal cancer

AIM: To evaluate of Cx26 in correlation with Bcl-xL and Bax proteins in colorectal cancer. METHODS: Immunohistochemical staining using specific antibodies was performed to evaluate the protein expression of Cx26, Bax and Bcl-xL in 152 colorectal cancer samples and the correlations among studied proteins as well as the relationships between the expression of Cx26, Bax, Bcl-xL and clinicopathological features were analyzed. RESULTS: Both normal epithelial cells and carcinoma cells expressed Cx26, Bax and Bcl-xL, but Cx26 in cancer cells showed aberrant, mainly cytoplasmic staining. Expression of Cx26, Bax and Bcl-xL was observed in 55.9%, 55.5% and 72.4% of evaluated colorectal cancers respectively. We found the positive correlation between Cx26 and Bax expression (r= 0.561, P<0.0001), Cx26 and Bcl-xL (P=0.409, P<0.0001) as well as between Bax and Bcl-xL (P=0.486, P<0.0001). Association of Cx26, Bax and Bcl-xL expression with histological G2 grade of tumors was noted (P<0.005, P<0.001 and P<0.002 respectively). CONCLUSION: Cytoplasmic presence of Cx26 and its association with apoptotic markers could indicate a distinct role from physiological functions of Cx26 in cancer cells and it could suggest that connexins might be a target point for modulations of apoptosis with therapeutic implications.

异氟醚对胎鼠脑原癌基因蛋白Bcl-2／Bax表达及幼鼠空间学习记忆的影响

目的 研究异氟醚麻醉对胎鼠出生后的学习记忆能力，以及对胎鼠大脑海马CA1区和皮质压部后区（Retrosplenial RS）Bcl-2／Bax表达变化的影响。方法28只孕21d的大鼠以随机数字表法随机分为异氟醚处理组和对照组，每组n=14。异氟醚组使用1．3％的异氟醚处理6h，对照组只使用30％的氧气和70％氮气混合气。使用水迷宫检测出生后28d的幼鼠空间学习记忆能力。免疫组化研究中，处理后2h检测胎鼠大脑皮质RS区和海马CAl区Bcl-2和Bax表达的变化。结果水迷宫实验中，2组隐藏平台试验的逃避潜伏期差异没有统计学意义，但是空间探索试验中异氟醚组在平台所在象限停留的时间明显多于对照组[（42．33±2．31）S，（33．2±2．15）S，t=2．21，P〈0．05]，差异有统计学意义。异氟醚组海马CAl区和皮质RS区Bcl．2的表达高于对照组，Bax的表达低于对照组，Bcl-2／Bax比值高于对照组[海马CA1区（4．40±0．86），（1．31±0．32），t=3．378，P〈0．01；皮质RS区（5．07±1．27），（1．47±0．48），t=2．656，P〈0．05]，差异具有统计学意义。结论1．3％异氟醚处理孕21d的大鼠能改善出生后幼鼠的空间记忆保持能力，并能增加胎鼠大脑皮质RS区和海马CA1区Bcl-2／Bax的比值。

CO-EXPRESSIONS OF SURVIVIN GENE, BCL-2 AND BAX PROTEINS IN OVARIAN CARCINOMA

Objective To characterize the cellular properties of ovarian cancer, we examined the correlation between the expression of apoptosis-related gene survivin and those of Bcl-2 and Bax proteins. Methods Expressions of survivin mRNA, and Bcl-2 and Bax proteins in 35 cases of ovarian carcinoma, 10 cases of borderline carcinoma, 10 cases of benign tumors and 10 cases of normal tissue were evaluated by reverse transcription polymer-ase chain reaction (RT-PCR) and immunohistochemistry SABC method, respectively. Results Expression of survivin gene was detected in a significantly greater proportion in ovarian carcinoma and borderline carcinoma than those in benign tumors and normal tissues. Although there was no relationship between expression of survivin gene and FIGO stage, histologic grade, pathological type and lymphatic metastasis, expressions of Bcl-2 and Bax proteins were positively and negatively correlated with that of survivin gene, respectively. Conclusion Survivin may play an important role in pathogenesis of ovarian carcinoma, with a synergistic role of apoptosis-related gene Bcl-2 protein and an antagonistic role of Bax protein in formation and progression of ovarian carcinoma.

细胞凋亡与宫颈癌发生的相关性研究

目的:探讨子宫颈癌发生中细胞凋亡相关基因蛋白对细胞凋亡的调节.方法:检测对象为重度非典型增生(severe dysplasia,SD)41例;原位癌(carcinoma in situ,CIS)37例,早期浸润癌(microinvasive carcinoma,MIC)35例,大细胞非角化型浸润癌(invasive large cell non-keratinizing epidermoid carcinoma,IC)40例及正常宫颈鳞状上皮(normal cervical squamous epithelium,NE)41例,共计194例经福尔马林固定、石蜡包埋的手术切除标本.凋亡细胞的检出使用TDT-mediated dUTP-biotin nick end labeling(TUNEL)方法,细胞凋亡相关基因蛋白p53、bcl-2、bax的表达采用单克隆抗体免疫组化ABC染色方法.结果:(1)伴随宫颈肿瘤性病变的进展凋亡细胞标记率显著减少,尤其SD及CIS组呈现有意义的进行性减少(P<0.01);(2)在SD、CIS组,p53、bcl-2及bax基因蛋白的表达与TUNEL标记率呈现有意义的相关性变化(P<0.05).结论:细胞凋亡的改变与宫颈癌发生的早期过程有关,p53、bcl-2、bax基因蛋白参与其调节.

山药多糖抗神经细胞缺氧性凋亡机制研究

目的探讨山药多糖抗神经细胞缺氧性凋亡作用机制。方法运用SD胎鼠大脑皮层神经细胞建立缺氧性神经细胞损伤体外模型,再使用不同质量浓度山药多糖处理,Rh-123染色检测线粒体损伤,RT-PCR及免疫细胞化学测定Caspase-3、Bax、Bcl-2 mRNA及蛋白表达。结果山药多糖抑制缺氧的神经细胞线粒体损伤,下调Caspase-3蛋白及mRNA的表达,下调Bax mRNA及蛋白的表达,上调Bcl-2 mRNA及蛋白的表达,提高Bcl-2/Bax mRNA及蛋白的比例(P<0.05)。结论山药多糖在一定发范围内能有效地抑制神经细胞缺氧性凋亡,其机理是降低凋亡基因及蛋白产生,上调抗凋亡基因及蛋白产生。

自噬及凋亡因子在慢性氟中毒大鼠肝脏中表达

目的探讨自噬相关因子LC3A、Beclin-1及凋亡因子Bcl-2、Bax在慢性氟中毒大鼠肝脏中的表达意义。方法将36只健康SD大鼠按体重随机分为对照组、低氟组、高氟组,分别用含氟量<1 mg/L的自来水和含氟5、50 mg/L的含氟水饲养6个月,观察氟斑牙形成情况;测定尿氟、骨氟含量以及大鼠肝功能;苏木素-伊红染色观察肝脏病理形态学改变;免疫组织化学法检测大鼠肝组织中微管相关蛋白轻链3A(LC3A)、哺乳动物ATG6同源蛋白(Beclin-1)及B细胞淋巴瘤/白血病-2蛋白(Bcl-2)、B细胞淋巴瘤/白细胞基因伴随蛋白x(Bax)的蛋白表达水平。结果与对照组比较,低、高氟组大鼠尿氟含量分别为[(2.18±0.14)、(2.40±0.19)mg/L]、骨氟含量分别为[(237.42±18.48)、(248.00±14.72)mg/kg]均明显升高(P<0.05);染氟组大鼠肝脏肝细胞索排列紊乱,肝细胞肿大,部分肝细胞胞质透亮,呈空泡样改变;与对照组比较,染氟组大鼠血清中谷丙转氨酶活性及谷草转氨酶活性明显升高(P<0.05);低、高氟组大鼠肝脏LC3A[(35.35±2.71)、(44.10±6.72)]、Beclin-1[(57.56±12.1)、(74.76±18.67)]及Bax[(51.1±9.23)、(62.32±10.3)]蛋白表达明显高于对照组,Bcl-2蛋白表达分别为[(55.18±8.36)、(39.05±6.91)]明显低于对照组(P<0.05)。结论过量氟可激活大鼠肝组织中自噬和凋亡因子,自噬和凋亡可能共同参与慢性氟中毒所致肝脏损伤的发病过程。