Gossypol acetic acid induces DNA double-strand breaks in human mucoepidermoid carcinoma cell MEC-1 / 生理学报

The present study was conducted to investigate the effects of gossypol acetic acid (GAA) on the proliferation of human mucoepidermoid carcinoma cell line MEC-1 in vitro and its possible molecular mechanisms of DNA double-strand breaks (DSB). MTT assay was performed to test the inhibition of proliferation of MEC-1 cells by GAA. DSB and γH2AX foci formation induced by GAA were detected by neutral comet assay and immunostaining. GAA (5-40 μmol/L) inhibited the growth of MEC-1 cells in a dose- and time-dependent manner. One of the indexes of comet assay, percentage of head DNA was decreased, however other indexes, including tail length, percentage of tail DNA, tail moment (TM) and Olive tail moment (OTM) were increased when treated with 2.5- 40 μmol/L GAA for 24 h or 20 μmol/L GAA for 3-48 h, compared with those in control. The percentage of γH2AX-positive cells was also increased when MEC-1 was treated with 2.5-20 μmol/L GAA for 24 h or 20 μmol/L GAA for 3-48 h, compared with that in control. All these results show that GAA inhibits the proliferation of MEC-1, and DSB maybe one of the mechanisms of inhibitory effect of GAA on the growth of tumor cells.

Comparative study of oxygen free radical metabolism in healthy native tibetans and migrated hans at different al- titude / 中国实用内科杂志

Objective To study the difference of oxygen free radical metabolism between healthy native Tibetans and mi- grated Hans at different altitude.Methods The activity of Total-antioxidation capability(T-AOC),superoxide dis- mutase(SOD),glutathione peroxidase(GSH-PX)and the content of,reactive oxygen species(ROS),malondialdehyde (MDA)and nitric oxide(NO)in serum in healthy native Tibetans and migrated Hans at different altitude were meas- ured.Results The activity of T-AOC,SOD,GSH-PX and the content of NO were increased in serum in native Tibet- ans group than that in migrated Hans group(P