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. 1981 Jun;78(6):3654–3658. doi: 10.1073/pnas.78.6.3654

Correlation of double-minute chromosomes with unstable multidrug cross-resistance in uptake mutants of neuroblastoma cells.

F Baskin, R N Rosenberg, V Dev
PMCID: PMC319629  PMID: 6943568

Abstract

A series of increasingly drug-resistant cell populations were selected and cloned from C-46 murine neuroblastoma with the chemotherapeutic drugs maytansine, vincristine, adriamycin, or Baker's antifol. All clones demonstrated reciprocal cross-resistance to these structurally and functionally diverse drugs and failed to accumulate radiolabeled vincristine, colchicine, or Baker's antifol despite normal drug binding to cell homogenates. Initial isolates of drug-resistant populations were genetically unstable, rapidly reverting to a drug-sensitive phenotype when grown without drug, at 0.05 reversion per cell division. After prolonged growth in drug, this drug-resistant genotype stabilized. Mean chromosome number increased 300% in an initially isolated 20-fold maytansine-resistant clone, which also displayed numerous double-minute chromosomes. Descendants 240-fold more resistant than the parent, also unstable, possessed the wild-type complement of 80 chromosomes, but 45% of these cells possessed 24 double-minute chromosomes per cell; such chromosomes were absent from the drug-sensitive parental clone. Only 1.0 and 1.2 double-minute chromosomes per cell were seen in a 7-fold stably resistant revertant or 1200-fold stably resistant descendants, respectively. Double-minute chromosomes containing amplified genes for the drug target dihydrofolate reductase (tetrahydrofolate dehydrogenase; 5,6,7,8-tetrahydrofolate:NADP+ oxidoreductase, EC 1.5.1.3) have been reported in an unstable methotrexate-resistant R1-A sarcoma. These extrachromosomal gene copies were absent in stably resistant progeny. The presence of similar particles in unstably drug-resistant uptake mutants of neuroblastoma and their diminution in stably resistant descendants supports and extends their possible role in the rapid onset and instability of epigenetic drug resistance in cancer chemotherapy.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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