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Cross-resistance patterns and antigen expression in Vinca alkaloid- and other multiple drug-resistant human leukemic
Abstract:
The studies presented in this report demonstrate that Vinca alkaloid-resistant human leukemic lymphoblasts display patterns of cross-resistance to other drugs that differ from those of cell lines selected for primary resistance to anthracyclines or epipodophyllotoxins. These various drug-resistant cell lines also showed differential expression of an antigen recognized by an antibody that distinguishes VLB-resistant from VLB-sensitive cells. Furthermore, comparable levels of resistance or cross-resistance to one drug are not predictive of cross-resistance to other drugs. Our data suggest, then, that the MDR phenotype is complex and may be the result of many and different biochemical lesions. Thus, in order to predict MDR, it may be necessary to document more than one of these changes with specific reagents.
Insights
Vinca alkaloid-resistant leukemia cells show varied cross-resistance to drugs, unlike other resistant cell lines. Predicting multidrug resistance (MDR) requires identifying multiple biochemical changes.
Area of Science:
- * Molecular biology
- * Cancer research
- * Pharmacology
Background:
- * Multidrug resistance (MDR) is a significant challenge in cancer chemotherapy.
- * Vinca alkaloids, anthracyclines, and epipodophyllotoxins are common anticancer agents.
- * Understanding cross-resistance patterns is crucial for effective treatment strategies.
Purpose of the Study:
- * To investigate cross-resistance patterns in Vinca alkaloid-resistant human leukemic lymphoblasts.
- * To compare these patterns with cell lines selected for resistance to other drugs.
- * To explore the complexity of the MDR phenotype and its prediction.
Main Methods:
- * Selection of human leukemic lymphoblast cell lines for resistance to Vinca alkaloids, anthracyclines, or epipodophyllotoxins.
- * Assessment of cross-resistance profiles to various anticancer drugs.
- * Immunological detection of differential antigen expression using specific antibodies.
Main Results:
- * Vinca alkaloid-resistant cells exhibited distinct cross-resistance patterns compared to anthracycline- or epipodophyllotoxin-resistant lines.
- * Differential expression of a specific antigen was observed between Vinca alkaloid-resistant and sensitive cells.
- * Drug resistance levels did not reliably predict cross-resistance to other agents.
Conclusions:
- * The multidrug resistance (MDR) phenotype is complex, arising from diverse biochemical alterations.
- * Predicting MDR necessitates identifying multiple molecular changes.
- * Targeted diagnostic reagents may be required to accurately assess MDR status.