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Multiwavelength videomicrofluorometric study of some human leukemic lymphoblasts: effect of adriamycin on some
1Laboratory of Physico-Chemical Biology of Integrated Systems, University of Perpignan, France.
Abstract:
The development of multidrug resistance (MDR) in heterogeneous cell sensitive and resistant populations to a variety of clinically important cytotoxic drugs poses a major obstacle to cancer chemotherapy. The MDR phenotype is characterized by a decrease the intracellular drug accumulation and by an overexpression of the MDR1 gene which encodes the membrane protein, P-glycoprotein (Pgp). To evaluate the MDR phenotype, rationale investigations of the cytotoxic processes and effect,s of Adriamycin (ADR) were done to obtain information on individual cells. Such information could be obtained through a multiparametric approach involving multiwavelength microfluorometry and numerical image analysis on single living cells. To achieve this, cells should be simultaneously stained with Hoechst 33342 (nuclear staining), Rhodamine 123 (mitochondria staining) and Nile Red (cell contour delineation). Changes in the biological parameters accessible from R123, Ho33342 and C-SNARF-1/AM (probe used for the pHi measurements) labelling were found more informative than changes in morphological parameters for the discrimination of sensitive and resistant cells. Furthermore, this approach allows the discrimination between two resistant cell lines expressing different mechanisms of resistance.
Insights
This study introduces a multiparametric single-cell analysis to distinguish multidrug resistance (MDR) in cancer cells. The method effectively differentiates sensitive and resistant cell lines based on biological parameters, not just morphology.
Area of Science:
- Cancer research
- Cell biology
- Pharmacology
Background:
- Multidrug resistance (MDR) is a significant challenge in cancer chemotherapy, characterized by reduced intracellular drug accumulation and P-glycoprotein (Pgp) overexpression.
- Distinguishing between sensitive and resistant cancer cell populations is crucial for effective treatment strategies.
Purpose of the Study:
- To develop and evaluate a multiparametric single-cell analysis method for assessing the multidrug resistance (MDR) phenotype.
- To investigate the cytotoxic effects of Adriamycin (ADR) on individual sensitive and resistant cancer cells.
Main Methods:
- Utilized multiwavelength microfluorometry and numerical image analysis on single living cells.
- Simultaneously stained cells with Hoechst 33342 (nuclear), Rhodamine 123 (mitochondria), and Nile Red (cell contour).
- Measured changes in biological parameters using probes like Rhodamine 123, Hoechst 33342, and C-SNARF-1/AM for intracellular pH (pHi).
Main Results:
- Biological parameters derived from R123, Ho33342, and pHi measurements were more effective than morphological parameters in discriminating sensitive and resistant cells.
- The multiparametric approach successfully differentiated between two resistant cell lines with distinct resistance mechanisms.
- The method provides detailed information on individual cells, aiding in the evaluation of cytotoxic drug effects.
Conclusions:
- A multiparametric single-cell analysis approach is highly effective for identifying and characterizing multidrug resistance (MDR) in cancer cells.
- This method offers a more informative way to distinguish between sensitive and resistant cell lines compared to traditional morphological assessments.
- The technique has the potential to improve the understanding and management of cancer chemotherapy resistance.