[Effects of apoptosis of Tca8113 cells induced by adriamycin on telomerase and telomere repeat binding factor proteins].

Objective: To investigate the role of telomerase and telomere repeat binding factors (TRF) in apoptosis.

Methods: The proliferative activity of Tca8113 cells was assessed by methyl thiazolyl tetrazolium (MTT) assay. After Tca8113 cells were treated with adriamycin at 5 mg/L, apoptotic morphology was observed under microscope with Giemsa staining and apoptosis examined by flow cytometry; analysis of telomerase activity was performed by TRAP-enzyme-linked immunosorbent assay; expression and expression level of TRF proteins were detected with immunohistochemical staining and immunofluorescence label assay, respectively.

Results: After Tca8113 cells were treated with adriamycin at 5 mg/L for 5 days and 7 days, the cells apoptosis was found. Telomerase activity dropped in time-dependent manner. Expression of TRF proteins appeared in nucleus of the cells. No statistical difference in expression levels of TRF was observed between the treated and untreated cells.

Conclusions: Tca8113 cells apoptosis induced by adriamycin decreased telomerase activity, but did not influence the expression level of TRF proteins.