白细胞介素-2对培养的乳腺癌细胞Bcap-37增殖的促进作用

目的 :研究白细胞介素 2 (IL 2 )对人乳腺癌Bcap 37细胞系增殖的影响 ,并探讨其可能的机制。方法 :以培养的Bcap 37细胞进行了以下实验 :用MTT比色法 ,测定IL 2对该细胞增殖的剂量效应 ;用免疫组化染色法 ,检测其表面IL 2的表达 ;用RT PCR技术 ,检测该细胞中IL 2Rα、β和γmRNA的表达 ;用流式细胞术 ,观察IL 2对该细胞细胞周期各阶段DNA含量的影响 ;用激光扫描共聚焦显微镜技术 ,检测IL 2对该细胞内Ca2 + 水平的影响。结果 :IL 2 (1× 10 5～ 1× 10 6U/L)可显著促进乳腺癌细胞Bcap 37的增殖。培养的Bcap 37细胞可分泌IL 2并表达IL 2Rα、β和γ。用流式细胞仪检测Bcap 37细胞中DNA的含量发现 ,IL 2 (1× 10 5U/L)可提高该细胞由G1期进入G2 和S期的比例。激光共聚焦法检测到IL 2 (1× 10 5U/L)可使Bcap 37细胞内的Ca2 + 浓度降低。结论 :IL 2参与了对乳腺癌细胞增殖的调节 ,其促增殖作用与该细胞上IL 2受体的表达 ,细胞中DNA含量的变化和Ca2 + 浓度的降低有关。

Enhancement effect of IL-2 on the proliferation of cultured mammary carcinoma cell line Bcap-37

AIM: To investigate the effects of IL-2 on the proliferation of human mammary carcinoma cell line Bcap-37 and explore its possible mechanism. METHODS: Enhancement effect of IL-2 on proliferation of cultured Bcap-37 cells, the IL-2 expression on the cells, the expressions of IL-2Ralpha, beta, gamma mRNAs in the cells, the effect of IL-2 on DNA content at various periods of cell cycle and on Ca(2+) concentration in the cells were detected or observed by MTT colorimetry, immunohistochemical staining, RT-PCR, flow cytometry and laser scanning confocal microscope, respectively. RESULTS: IL-2 of 1x10(5) to 1x10(6) U/L significantly stimulated the proliferation of cultured Bcap-37 cells. IL-2 was secreted and IL-2Ralpha, beta and gamma were expressed by cultured Bcap-37 cells. IL-2(1x10(5) U/L) increased ratio of Bcap-37 cells in G(2) and S phases and decreased the Ca(2+) release from Bcap-37 cells. CONCLUSION: IL-2 significantly enhance the proliferation of mammary carcinoma cell line Bcap-37. The enhancement effect of IL-2 on Bcap-37 cell proliferation is possibly related to the expression of IL-2R and decreased Ca(2+) concentration in the cells.