Relationship between Cell Proliferation and Apoptosis in Cervical Carcinoma

Objective To study the relationship between cell proliferation and apoptosis in cervical carcinoma and its clinical significance. Methods The cell proliferation and apoptosis of cervical epithelial cells in archival formalin-fixed, paraffin-embedded tissue sections of normal cervix, cervical intraepithelial neoplasms (GIN) and cervical squamous carcinoma were tested by using immunohistochemistry assay and DNA nick end-labeling technigue. The proliferation index (PI) and apoptosis index (AI) were calculated and their correlation with clinical and pathological data was analyzed.Results PI was gradually increased, but the AI and AI/PI ratio decreased from normal cervical epithelium, GIN to cervical carcinoma. There was no significant relationship among cell proliferation, apoptosis, clinical stages and pathological grades. High AI was always associated with a poor prognosis of the patients.Conclusion Cell proliferation and apoptosis allow to distinguish among normal epithelium, GIN and cervical carcinoma and are useful for the assessment of the malignant potential of tumor tissues.

VEGF-C诱导宫颈癌Hela细胞Bcl-2、cyclinD1的表达

目的研究VEGF-C对体外培养的宫颈癌Hela细胞增殖和凋亡的分子机制。方法应用重组人VEGF-C蛋白体外刺激宫颈癌Hela细胞,MTT法检测细胞增殖、流式细胞仪检测细胞周期和凋亡、Western Blotting检测增殖凋亡相关基因Bcl-2、cyclin D1蛋白水平的变化。结果 10、20、50 ng/μl VEGF-C处理后,细胞增殖指数分别为(1.00±0.03)、(1.25±0.05)、(1.55±0.08)、(2.13±0.08),呈剂量依赖性升高(P<0.05)。细胞周期S期比率呈剂量依赖性升高(P<0.05),分别为(30.91±0.09)%、(37.95±0.27)%、(45.05±0.40)%、(64.26±0.20)%;细胞凋亡率呈剂量依赖性降低(P<0.05),分别为(12.4±0.3)、(11.4±0.2)、(9.6±0.15)、(5.5±0.25)。Bcl-2、cyclin D1蛋白表达呈剂量依赖性升高。结论外源性VEGF-C通过细胞内信号的传递,诱导cyclin D1的表达,使肿瘤细胞S期加快,促进细胞周期的进程,来促进Hela细胞增殖;诱导Bcl-2的表达,抑制凋亡。