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The FASEB Journal, Vol 3, 2583-2592, Copyright © 1989 by The Federation of American Societies for Experimental Biology
REVIEWS |
PF Juranka, RL Zastawny and V Ling
Ontario Cancer Institute, Canada.
The study of multidrug resistance (MDR) in tumor cell lines has led to the discovery of the plasma membrane P-glycoprotein (Pgp) molecule. This protein functions as an energy-dependent pump for the efflux of diverse anticancer drugs from MDR cells. It now appears that Pgp- mediated MDR tumor cells do occur in human cancers, and that they are likely to play a role in the ultimate response of patients to chemotherapy. Chemosensitizers, compounds able to reverse the MDR phenotype, have been identified and offer the exciting possibility of improving efficacy for some nonresponsive malignancies. Surprisingly, Pgp-like molecules can be found in evolutionarily distant species among both eukaryotes and prokaryotes. As a group, these proteins form a superfamily of ATP-dependent transport proteins. This finding has broad implications and provides new insights into how living organisms use this fundamental transport system to regulate the trafficking of diverse molecules across biological membranes.
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