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Purpose.
P-glycoprotein (P-gp), a membrane ATPase expelling many structurally unrelated compounds out of cells, is one of the major contributors to multidrug resistance. It is enriched in cold TritonX-100 insoluble membrane domains (i.e., rafts). The purpose of this work was to characterize the ATPase activities of raft preparations from P388 cells overexpressing P-gp (P388/ADR) or devoid of P-gp (P388) and to establish a P-gp–enriched screening system for P-gp–interfering compounds.
Methods.
Rafts were extracted with cold TritonX-100. The ATPase activity was characterized in 96-well plates using a fluorescence assay.
Results.
The ATPase activity per mg protein was about five times higher in P388/ADR rafts than in crude membranes. The anti–P-gp antibody C219 inhibited 20% of the activity in P388/ADR rafts but only about 10% of the activity in P388/ADR crude membranes and had no effect on the activity of P388 rafts. The known P-gp–activating compounds verapamil, progesterone, and valinomycin revealed the typical bell-shaped activity/concentration profiles in P388/ADR rafts, indicative for activation at low compound concentrations and inhibition at concentrations >10 to 100 μM. The inhibitory effect was also observed in P388 rafts.
Conclusions.
Extracted rafts are rich in functional ATPases. Rafts from P-gp–overexpressing cells display P-gp–typical ATPase activity and provide an easy, P-gp–enriched screening system.
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Abbreviations
- ADP:
-
adenosine diphosphate
- ATP:
-
adenosine triphosphate
- BSA:
-
bovine serum albumin
- DTT:
-
dithiothreitol
- P-gp:
-
P-glycoprotein
- SDS-PAGE:
-
sodium laurylsulfate-polyacrylamide gel electrophoresis
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Bucher, K., Besse, C., Kamau, S. et al. Isolated Rafts from Adriamycin-Resistant P388 Cells Contain Functional ATPases and Provide an Easy Test System for P-glycoprotein–Related Activities. Pharm Res 22, 449–457 (2005). https://doi.org/10.1007/s11095-004-1883-x
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DOI: https://doi.org/10.1007/s11095-004-1883-x