鼻咽癌肝转移的超声诊断

本文探讨鼻咽癌肝内转移灶声像图特征及超声显像在诊断中的作用。１４例经病理确认的鼻咽癌肝转移患者，低分化鳞癌１０例，泡状核细胞癌２例，基底细胞癌１例，多形细胞癌１例。男９例，女５例，年龄２５～５９岁，平均４８．７岁。病程１．１～４．２年，其中３年内有１...

EFFECT OF UP REGULATION OF S ADOMET SYNTHETASE ON TAXOL INDUCED APOPTOSIS IN HUMAN BREAST CANCER CELLS

Objective: To investigate the gene regulation of taxolinduced apoptosis Methods: Northern blot hybridization, enzyme activity assay of S AdoMet synthetase and flow cytometry were performed in the investigation of expression in the mRNA level and biological action of S AdoMet synthetase in taxol induced apoptosis in human breast cancer cell line (BCap 37) Results: Up regulation of S AdoMet synthetase expression was resulted by taxol treatment and the expression peaked at 48 hours Moreover,the up regulation of S AdoMet synthetase was associated with cytotoxicity of anti microtubule agents including taxol and colchicine Inhibition rate of S AdoMet synthetase activity by 1% DMSO was 34% in taxol treated cells and 14% in taxol untreated cells compared to control groups, respectively Posttreatment with 1% DMSO following pretreatment with individual antitumor agent for 3 hrs promoted apoptotic cell death of taxol ,colchicine ,and adriamycin treated Bcap37 cells Conclusion : The induction of apoptosis enhanced by post treatment with DMSO in taxol treated cells is probably linked to its inhibition on enzyme activity of S AdoMet synthetase ,suggesting that the increased expression of S AdoMet synthetase possibly plays an important role in protecting cells from DNA fragmentation in taxol induced apoptosis Accepted July 26, 1998 This work was supported by the National High Biotechnology Foundation of China and a grant from the Natural Science Foundation of Zhejiang Province, China