Long-term exposure to MST-312 leads to telomerase reverse transcriptase overexpression in MCF-7 breast cancer cells
Abstract
Telomerase is an enzyme responsible for telomere maintenance in almost all human cancer cells, but generally not expressed in somatic ones. Therefore, antitelomerase therapy is a potentially revolutionary therapeutic strategy, and the antitumor activity of telomerase inhibitors (TI) has been studied extensively recently, mainly for breast cancer. However, the effects expected from treatment with TI will appear only after many cell divisions, but the effects of this long-term approach are unknown. In this work, the consequences of 3120 h exposure of human breast cancer cells to TI MST-312 were investigated. MCF-7 cells were treated with MST-312 at a subtoxic concentration for a long time, and then cell morphology, viability, senescence, and proliferation were analyzed by phase-contrast microscopy, MTT assay, β-galactosidase test, and the trypan blue exclusion assay, respectively. Also, chromosomal stability was evaluated by classical cytogenetic analysis. The average length of telomeres and telomerase reverse transcriptase expression were accessed by real-time PCR and real-time RT-PCR, respectively. The MST-312 showed cytotoxic action and promoted telomere erosion, senescence, and chromosome aberrations, as expected, but in a sm...Continue Reading
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