hCG对绒癌细胞系MT-MMP和TIMP mRNA表达的影响

目的 探讨人类绒毛膜促性腺激素 (hCG)对绒癌细胞表达侵袭性相关基因的影响。方法 以绒癌组织来源的JEG 3细胞系为研究对象 ,采用逆转录多聚酶链反应 (RT PCR)方法 ,观察了hCG对JEG 3细胞膜型金属蛋白酶 (MT MMP)和金属蛋白酶组织抑制因子 (TIMP)mRNA表达的影响。结果 在所有 6型MT MMP中JEG 3细胞仅表达MT2 MMP ,且其表达量可被 2 5IU/mlhCG处理 5 0h而降低。而在TIMP的 4种亚型中 ,JEG 3细胞表达其中的TIMP 1和TIMP 2两型 ,在受hCG处理后JEG 3细胞中TIMP 1的表达量下降 ,TIMP 2则被诱导增加。结论 高浓度长时间的hCG作用可通过改变MT MMP和TIMP转录表达的变化影响绒癌细胞 /滋养细胞的侵袭性。

跨膜蛋白酶研究进展

目的 总结近几年国内外对跨膜蛋白酶的研究现状。方法 综合分析近年发表的有关文献。结果 探讨了跨膜蛋白酶的分类、结构、功能及研究前景。结论 跨膜蛋白酶具有蛋白裂解和附着能力 ,在信号跨膜传导。

Cell surface activation of progelatinase A (proMMP-2) and cell migration

Gelatinase A (MMP-2) is considered to play a critical role in cell migration and invasion. The proteinase is secreted from the cell as an inactive zymogen. In vivo it is postulated that activation of progelationase A (proMMP-2) takes place on the cell surface mediated by membrane-type matrix metalloproteinases (MT-MMPs). Recent studies have demonstrated that proMMP-2 is recruited to the cell surface by interacting with tissue inhibitor of metalloproteinases-2 (TIMP-2) bound to MT1MMP by forming a ternary complex. bee MT1-MMP closely located to the ternary complex then activates proMMP-2 on the cell surface. MT1-MMP is found in cultured invasive cancer cells at the invadopodia. The MTMMP/TIMP-2/ MMP- 2 system t bus provides localized expression of proteolysis of the extracellular matrix required for cell migration.