Amplification of DNA sequences in human multidrug-resistant KB carcinoma cells.
AUTOR(ES)
Fojo, A T
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=391393Documentos Relacionados
- Isolation of human mdr DNA sequences amplified in multidrug-resistant KB carcinoma cells.
- Isolation and characterization of DNA sequences amplified in multidrug-resistant hamster cells.
- Comparison of ion channels in multidrug-resistant and -sensitive human leukemic cells.
- ATP-dependent transport of vinblastine in vesicles from human multidrug-resistant cells.
- Physical mapping, amplification, and overexpression of the mouse mdr gene family in multidrug-resistant cells.
