Cardiotoxins(CTXs)為Naja naja atra venom所分離出之多胜肽,本篇將利用聚合酶鏈鎖反應來討論CTX Ⅲ對癌細胞K562 cells做Apop- tosis、Cell cycle arrest和Angiogenesis的分子作用機制和研究相關基因表現的探討。本研究發現以CTX Ⅲ (2μg/ml) 處理過後的K562細胞,會有細胞凋亡和細胞週期抑制在G2/M phase現象。K562 cells在加入2μg/ml CTX Ⅲ處理過後,結果發現在加入CTX Ⅲ處理後,在細胞凋亡途徑中,c-jun、Bax、Caspase-12的mRNA 有被活化的現象產生,在細胞週期方面,藉由抑制cyclin A、cyclin B1和cdk 2的mRNA 表現導致停在G2/M Phase,因此以上初步探討可以了解CTX Ⅲ會導致K562細胞凋亡、細胞週期停滯等作用機制。
Cardiotoxin Ⅲ (CTX Ⅲ) , a basic poly-peptide of 60-amino acid residues isolated from Naja naja atra venom, exerts its anti- proliferative activity in human leukemia K562 cells. In the present study, the expression of mRNAs related to cell cycle, apoptosis and angiogenesis in human leukemia K562 cells induced by CTX Ⅲ was investigated by semi-quantitative reverse trans- cription-polymerase chain reaction (RT-PCR) analysis. After CTX Ⅲ treatment resulted in G2/M phase arrest in the cell cycle progression, which was associated with a marked decrease in the mRNA and angiogenesis expressions of cyclin A, cyclin B1, and Cdk 2. The increase in apoptosis was assoxiated with the Bax, c-jun, caspase-12. Taken to gether, these molecular alterations provide an insight into CTX Ⅲ caused growth inhibition, G2/M arrest, and apoptotic death of K562 cells.