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Resistance to lipophilic cationic compounds in multidrug resistant leukemia cells
Abstract:
Previously we have shown that multidrug resistant cells are cross-resistant to certain permanently charged cationic lipophilic compounds. In the present study we extend these observations to additional cationic lipophilic compounds with unrelated chemical structures. Study of the growth inhibitory activity of series of triphenylalkyl-phosphonium and alkyl-ammonium compounds revealed that cross-resistance to these compounds in multidrug resistant P-388 murine leukemia cells, was related to the presence of cationic charge but not to the molecular size/degree of lipophilicity.
Insights
Multidrug resistant cells exhibit cross-resistance to permanently charged, lipophilic compounds. This resistance is linked to the compound's cationic charge, not its size or lipophilicity.
Area of Science:
- Pharmacology
- Biochemistry
- Cell Biology
Background:
- Multidrug resistance (MDR) in cancer cells limits therapeutic efficacy.
- MDR cells display cross-resistance to various chemotherapeutic agents.
- Previous studies identified cross-resistance to certain permanently charged cationic lipophilic compounds.
Purpose of the Study:
- To investigate cross-resistance in multidrug resistant P-388 murine leukemia cells.
- To evaluate the growth inhibitory activity of novel triphenylalkyl-phosphonium and alkyl-ammonium compounds.
- To determine the structural factors (charge, size, lipophilicity) influencing cross-resistance.
Main Methods:
- Synthesis and testing of triphenylalkyl-phosphonium and alkyl-ammonium compounds.
- Assessment of growth inhibitory activity against P-388 murine leukemia cells.
- Correlation analysis of compound structure with observed resistance.
Main Results:
- Multidrug resistant P-388 cells showed cross-resistance to tested phosphonium and ammonium compounds.
- Cross-resistance was observed across compounds with unrelated chemical structures.
- The presence of a cationic charge was identified as the key factor for cross-resistance.
Conclusions:
- Cationic charge, rather than molecular size or lipophilicity, dictates cross-resistance in MDR cells.
- These findings contribute to understanding MDR mechanisms.
- Potential for developing new therapeutic strategies targeting MDR.