蝎毒多肽对肿瘤细胞的抑制作用研究

Inhibitory effect of polypeptide from Buthus martensii Karsch on neoplasm cells

目的 :观察蝎毒多肽 (PBMV)对肿瘤细胞生长、细胞周期、P5 3表达和膜电位的影响。方法 :MTT法、集落形成、细胞分裂指数、流式细胞仪和玻璃微电极细胞内记录法。结果 :PBMV对数种肿瘤细胞具有毒性作用 ,细胞生长抑制、集落形成能力和分裂指数降低、多核细胞数减少 ;PBMV使进入S期的CNE - 2Z细胞明显减少 ,G1、S和G2 期细胞的百分比增多 (P <0 0 1) ;PBMV处理后 ,CNE - 2Z细胞P5 3蛋白表达量降低 (P <0 0 1) ,细胞膜负电位明显减小 ,胞膜呈去极化状态。结论 :PBMV可能具有膜毒素的作用 ,通过使CNE - 2Z细胞膜电位降低 ,影响肿瘤细胞的生长增殖。

AIM: To observe the inhibitory effects of polypeptide from Buthus martensii venom (PBMV) on human tumor cell lines and the influence of PBMV on cell cycle migration, expression of tumor-suppressor gene p53 and the membrane potential of CNE-2Z cells. METHODS: MTT colorimetric method, the colony formation and mitosis index, flow cytometry assay and intracellular recording with glass microelectrodes were used. RESULTS: PBMV had obvious cytotoxicity on several tumor cell lines. The cells grow was inhibited by PBMV, colony formation rate and mitotic index of tumor cells were reduced and the number of polykaryocyte was decreased. CNE-2Z cells in S phase were reduced evidently after they were treated with PBMV (P<0 01). After CNE-2Z cells were incubated with PBMV, P53 protein expression in the cells decreased obviously. Differences were very distinct (P<0 01). The negative potential of cell membrane reduced evidently and cell membrane was in depolarization state. CONCLUSION: PBMV probably possesses the effects of the “membrane toxin”. By decreasing the membrane potential, the growth and proliferation of tumor cells were interfered by PBMV.