| Literature DB >> 3865187 |
A T Fojo, J Whang-Peng, M M Gottesman, I Pastan.
Abstract
Four KB carcinoma cell lines selected independently for resistance to either colchicine, adriamycin, or vinblastine were studied. All cell lines showed high levels of resistance to the selecting drug and cross-resistance to the other drugs and to actinomycin D. Double-minute chromosomes could be identified on chromosomal spreads of these multidrug-resistant KB cell lines. Amplification of specific DNA sequences was demonstrated by using the technique of in-gel renaturation. All the cell lines share common amplified sequences. There are also amplified sequences that are specific for each cell line. A revertant cell line that has reacquired drug sensitivity has lost its amplified sequences. Specific probes obtained by cloning amplified sequences from the cell line selected in vinblastine recognize amplified sequences in all the resistant lines. The presence of common amplified sequences in these cell lines is strong evidence for the importance of these regions in multiple drug resistance.Entities:
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Year: 1985 PMID： 3865187 PMCID： PMC391393 DOI： 10.1073/pnas.82.22.7661
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN： 0027-8424 Impact factor: 11.205