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Characteristics of four Friend leukemia cell sublines resistant to adriamycin
B Desoize1, C Broglio, M C Gorisse
1GIBSA, Institut Jean Godinot, Reims, France.
Abstract:
Resistance of Friend murine erythroleukemia cells was induced or selected by continuous stepwise exposure to adriamycin (ADM). The resistance index (R.I.) varied with different "mdr type" drugs, even when the compounds were closely related as ADM and daunorubicin (DNR). The cell uptake of anthracycline, evaluated by flow cytometry (FCM), was better correlated with the R.I. than the HPLC assessment. The quantitative cytology showed nuclear changes (size and color distribution); all the modifications were in part dependent on the degree of resistance. This study showed that the graded resistant sublines differed in their resistant phenotypes apart from their different degree of resistance.
Insights
This study demonstrates that Adriamycin-resistant murine erythroleukemia cells exhibit varied resistance phenotypes. Cell uptake and nuclear changes correlate with resistance levels, highlighting distinct resistant characteristics.
Area of Science:
- Cellular and Molecular Biology
- Pharmacology
- Cancer Research
Background:
- Acquired resistance to chemotherapy is a major challenge in cancer treatment.
- Adriamycin (ADM) is a widely used anthracycline chemotherapy agent.
- Understanding the mechanisms of drug resistance is crucial for improving therapeutic efficacy.
Purpose of the Study:
- To investigate the phenotypic characteristics of murine erythroleukemia cells selected for resistance to Adriamycin (ADM).
- To compare the correlation between drug uptake, cellular changes, and the degree of resistance.
- To explore differences in resistant phenotypes among sublines with varying resistance levels.
Main Methods:
- Induction of drug resistance through stepwise exposure of Friend murine erythroleukemia cells to ADM.
- Assessment of drug resistance using a resistance index (R.I.).
- Evaluation of anthracycline (ADM and daunorubicin) cellular uptake via flow cytometry (FCM) and High-Performance Liquid Chromatography (HPLC).
- Quantitative cytology to analyze nuclear morphology (size and color distribution).
Main Results:
- Resistance index (R.I.) varied for different "mdr type" drugs, including closely related compounds like ADM and daunorubicin (DNR).
- Cellular uptake of anthracyclines, measured by FCM, showed a stronger correlation with R.I. than HPLC assessments.
- Quantitative cytology revealed nuclear changes (size and color distribution) that were partially dependent on the degree of resistance.
- Graded resistant sublines exhibited distinct resistant phenotypes beyond their varying resistance levels.
Conclusions:
- Murine erythroleukemia cells selected for ADM resistance display diverse resistant phenotypes.
- Cellular uptake and nuclear alterations are key indicators correlating with the degree of drug resistance.
- The study underscores the heterogeneity of drug resistance mechanisms in cancer cells.