Telomere and microtubule targeting in treatment-sensitive and treatment-resistant human prostate cancer cells.

Molecular Pharmacology
Bin ZhangArif Hussain

Abstract

Modulating telomere dynamics may be a useful strategy for targeting prostate cancer cells, because they generally have short telomeres. Because a plateau has been reached in the development of taxane-based treatments for prostate cancer, this study was undertaken to evaluate the relative efficacy of targeting telomeres and microtubules in taxane-sensitive, taxane-resistant, androgen-sensitive, and androgen-insensitive prostate cancer cells. Paclitaxel- and docetaxel-resistant DU145 cells were developed and their underlying adaptive responses were evaluated. Telomere dynamics and the effects of targeting telomeres with sodium meta-arsenite (KML001) (an agent undergoing early clinical trials), including combinations with paclitaxel and docetaxel, were evaluated in parental and drug-resistant cells. The studies were extended to androgen-sensitive LNCaP cells and androgen-insensitive LNCaP/C81 cells. Both P-glycoprotein (Pgp)-dependent and non-Pgp-dependent mechanisms of resistance were recruited within the same population of DU145 cells with selection for drug resistance. Wild-type DU145 cells have a small side population (SP) (0.4-1.2%). The SP fraction increased with increasing drug resistance, which was correlated with enhanced...Continue Reading

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