J. Membrane Biol. 166, 71–73 (1998) The Journal of Membrane Biology © Springer-Verlag New York Inc. 1998 Letters to the Editor Received: 17 June 1998 Sir, more confused. When Sharom concludes mutations in A recent topical review on Pgp–mediated drug transport Pgp “. . . alter both drug resistance...and drug- by F.J. Sharom (J. Membrane Biol. 160:161–175) con- stimulated ATP hydrolysis profiles...”she neglects that tains a number of errors and omissions. A more com- these experiments typically compare cell lines selected plete analysis of all available data would be of benefit. or conditioned on different concentrations of complex Proper discussion of other models [1–4] that do not vio- drugs (or different drugs). Currently, it is unclear wheth- late fundamental laws as do drug pump models, requires er phenotypic differences are even due to mutant Pgps. attention to biophysical principles  that are not fully “Pumping” assays that have been used to draw many entertained by Sharom. conclusions have almost always been zero trans efflux To understand controversy in this field we must fol- (or influx) measurements, where transport against a con- low its history. Starting nearly 30 years ago multidrug centration gradient (i.e., “pumping” in the correct sense) resistant
The Journal of Membrane Biology – Springer Journals
Published: Feb 2, 2014
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