Assessment of Golgi Apparatus Versus Plasma Membrane-localized Multi-drug Resistance-associated Protein 1

Overview

Journal Mol Pharm

Publisher American Chemical Society

Specialty Pharmacology

Date 2008 Jun 19

PMID 18557629

Citations 5

Authors

Allyn M Kaufmann

Alana J Toro-Ramos

Jeffrey P Krise

Affiliations

Soon will be listed here.

Abstract

Traditionally, proteins belonging to the ATP-binding cassette superfamily have been thought to function exclusively at the plasma membrane (PM) of cells. We have previously shown multidrug resistance-associated protein 1 (MRP1) to reside on the Golgi apparatus of the multidrug resistant (MDR) human leukemic cell line HL-60 (HL-60/ADR); however, neither the prevalence of this abnormal localization nor the functionality of the transporter at the Golgi has been thoroughly addressed. To assess the functionality of MRP1, with respect to its localization in the cell, we transfected MRP1-deficient HeLa cells with an MRP1-enhanced green fluorescent protein (MRP1-EGFP) plasmid. Untreated cells expressed MRP1-EGFP at the PM; however, cells pretreated with monensin caused the transporter to localize on the Golgi apparatus. The MRP1-mediated decline in cytosolic fluorescence of the MRP1 substrate sulforhodamine 101 (SR101) was comparatively evaluated. The rate of decline of SR101 cytosolic fluorescence was found to be of similar magnitude regardless of the localization of MRP1. Additionally, we show that a number of human leukemic cell lines appear to have an inefficient Golgi apparatus to PM secretory pathway that could be responsible for the Golgi localization of MRP1.

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