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机构地区:[1]湖北省宜昌市第三人民医院普外科,443003 [2]湖北省宜昌市中心人民医院普外科 [3]三峡大学第一临床医学院普外科
出 处:《中国医药》2010年第5期426-428,共3页China Medicine
摘 要:目的探讨蛋白激酶Ca(PKC—α)与半胱氨酸天冬氨酸蛋白酶3(Caspase-3)在大肠癌中的表达及其与细胞凋亡的关系。方法采用免疫组化SP法检测83例大肠组织(正常组织15例,腺瘤组织21例,癌组织47例)中PKC-α和Caspase-3的表达水平,同时采用DNA原位末端标记法标记大肠癌组织中的凋亡细胞。结果PKC-α在大肠癌组织中阳性表达[31/47例(66.0%)]与正常组织[3/15例(20.0%)]及腺瘤[10/21例(47.6%)]相比,差异有统计学意义(P〈0.05)。Caspase-3在正常组织中的阳性表达[12/15例(80.0%)],与腺瘤[13/21例(61.9%)]及大肠癌组织[15/47例(31.9%)]相比,差异有统计学意义(P〈0.05),Caspase-3的阳性表达仅与大肠癌组织分化程度关系密切(P〈0.05)。PKC-仅阳性表达的大肠癌组织中细胞凋亡指数(1.62±0.57)明显低于阴性组(3.28±0.75)(P〈0.05),Caspase-3阳性组细胞凋亡指数(2.40±0.55)明显高于阴性组(1.25±0.59)(P〈0.05)。PKC—α与Caspase-3的表达呈负相关(r=-0.498,P〈0.05)。结论PKC—α和Caspase-3与大肠癌的细胞凋亡密切相关,参与细胞凋亡的调节机制,在大肠癌恶变的过程中发挥重要作用。Objective To study the expression of protein kinase C (PKC) -α and Caspase-3 in colorectal carcinoma and to analyze their relation with apoptosis. Methods Immunohistochemistry and the TdT-mediated dUTP nick and labeling(TUNEL) were used to investigate apoptosis and the alteration of PKC-α and Caspase-3 in 47 cases of colorectal carcinomas, 21 colorectal adenomas and 15 normal tissues. Results The positive rates of PKC-α expression in normal colorectal tissues, adenomas and carcinomas were 20.0%, 47.6%, 66.0%, respec tively (P 〈 0.05 ). Overexpression of Caspase-3 was 31.9% ,61.9%, 80.0% in carcinomas, adenomas and normal colorectal tissues, respectively (P 〈 0.05 ), which was correlated with tumour cellular differentiation ( P 〈 0.05 ). The apoptosis index (AI) of was significantly lower than that of PKC-α negative cases ( 1.62 ± 0. 57 vs 3.28 ± 0.75) (P 〈 0.05 ). The apoptosis index of Caspase-3-positive eases was significantly higher than that of Caspase-3- negative cases(2.40 ± 0.55 vs 1.25 ± 0.59)( P 〈 0.05 ). The expression of PKC-α was negatively correlated with Caspase-3 (r = - 0.498, P 〈 0.05). Conclusions The expression of PKC-α and Caspase-3 is closely associated with apoptosis in colorectal carcinoma. The PKC-α and Caspase-3 may participate in the mechanism of apoptosis and play important roles in malignance of colorectal carcinoma.
关 键 词:结直肠肿瘤 蛋白激酶C 半胱氨酸天冬氨酸蛋白酶3 细胞凋亡
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