Learn More
Reports of multiple distinct mitoxantrone-resistant sublines without overexpression of P-glycoprotein or the multidrug-resistance associated protein have raised the possibility of the existence of another major transporter conferring drug resistance. In the present study, a cDNA library from mitoxantrone-resistant S1-M1-80 human colon carcinoma cells was(More)
Fumitremorgin C (FTC) is a potent and specific chemosensitizing agent in cell lines selected for resistance to mitoxantrone that do not overexpress P-glycoprotein or multidrug resistance protein. The gene encoding a novel transporter, the breast cancer resistance protein (BCRP), was recently found to be overexpressed in a mitoxantrone-selected human colon(More)
P-glycoprotein is an energy-dependent drug efflux pump with broad specificity for hydrophobic antitumor agents such as vinblastine, doxorubicin, and taxol. We have previously shown that [3H]azidopine and [125I] iodoaryl azidoprazosin, which are photoaffinity probes for the alpha 1-subunit of the L-type calcium channel and alpha 1-adrenergic receptor,(More)
BRCA1 dysfunction in hereditary breast cancer causes defective homology-directed DNA repair and sensitivity towards DNA damaging agents like the clinically used topoisomerase I inhibitors topotecan and irinotecan. Using our conditional K14cre;Brca1(F/F);p53(F/F) mouse model, we showed previously that BRCA1;p53-deficient mammary tumors initially respond to(More)
A cDNA encoding the novel drug resistance gene, IMI' (originally only MDR1 gene amplification was observed in the S1B120 colon carci noma cell line. These data indicate that although both the MRP and LRP genes map to the short arm of chromosome 16, they are rarely coamplified and are not normally located within the same amplicon. A key role for chromosome(More)
  • 1