磷脂酰肌醇3激酶和蛋白激酶B在宫颈癌组织中的表达及意义

背景与目的:磷脂酰肌醇3激酶/蛋白激酶B(PI3K/Akt)信号转导通路具有重要的细胞调节功能,在肿瘤的发生发展中也发挥着重要的作用。但目前对宫颈癌中该通路的研究尚不充分。本研究拟检测不同宫颈病变组织中PI3K和Akt蛋白的表达,探讨PI3K/Akt信号转导途径与宫颈癌生物学行为的关系。方法:采用免疫组化SP法检测76例宫颈癌组织,21例宫颈上皮内瘤变组织,10例正常宫颈组织中PI3K、Akt蛋白的表达情况,并分析与宫颈癌临床病理因素的关系。结果:PI3K蛋白在正常宫颈组织中无表达,宫颈上皮内瘤变组织中表达率为42.9%,显著低于宫颈癌组织的69.7%(P<0.01)。Akt蛋白在正常宫颈组织和宫颈上皮内瘤变组织中的表达率分别为10.0%和52.4%,显著低于宫颈癌组织的75.0%(P<0.01)。PI3K和Akt蛋白的表达与宫颈癌患者临床分期、病理分级、淋巴转移有关(P<0.01),与年龄、原发灶大小、组织类型无关(P>0.05)。随着宫颈癌组织中PI3K表达的增强,Akt的阳性率增加。二者呈正相关(r=0.425,χ2=18.96,P<0.01)。结论:PI3K蛋白的高表达和Akt蛋白的高表达与宫颈癌细胞的增殖、浸润和转移有一定的相关性。

Expression and clinical significance of phosphatidylinositol 3-kinase and protein kinase B in cervical carcinoma

BACKGROUND & OBJECTIVE: Phosphatidylinositol 3-kinase /protein kinase B (PI3K/Akt) signaling pathway is involved in a variety of important cellular functions, including genesis and progression of neoplasms. However, its role in cervical cancer is unclear. This study was to detect the expression of PI3K and Akt proteins in different cervical lesions, and to investigate the correlation of PI3K/Akt signal transduction pathway to biological behaviors of cervical carcinoma. METHODS: The expression of PI3K and Akt in 76 specimens of cervical carcinoma,21 specimens of cervical intraepithelial neoplasia and 10 specimens of normal cervical epithelium were detected by SP immunohistochemistry. Their correlations to clinicopathologic features of cervical carcinoma were analyzed. RESULTS: The positive rates of PI3K and Akt were significantly lower in normal cervical epithelium and cervical intraepithelial neoplasia than in cervical carcinoma (0.0% and 42.9% vs. 69.7%, P<0.01;10.0% and 52.4% vs. 75.0%,P<0.01). The expression of PI3K and Akt proteins were correlated to clinical stage, pathologic grade and lymph node metastasis(P<0.01), but not to age, the size of primary focus, and histological type(P>0.05).The expression of PI3K protein was positively correlated to the expression of Akt protein(r=0.425,P<0.01). CONCLUSION: High expression of PI3K and Akt are involved in proliferation, malignant transformation, invasion and metastasis of cervical carcinoma, both of which may play important roles in the occurrence and development of human cervical carcinoma.