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Related Experiment Video

Updated: Jun 3, 2026

In vitro Investigation of the MexAB Efflux Pump From Pseudomonas aeruginosa

In vitro Investigation of the MexAB Efflux Pump From Pseudomonas aeruginosa

Published on: February 17, 2014

Measurement of P-glycoprotein Function.

H J Broxterman¹

¹Department of Medical Oncology, Free University Hospital, Amsterdam, The Netherlands.

Methods in Molecular Medicine

|March 5, 2011

Summary

This summary is machine-generated.

Multidrug resistance (MDR) in cancer, driven by P-glycoprotein (Pgp), reduces chemotherapy effectiveness. Functional assays measuring Pgp

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Area of Science:

Molecular Biology
Cancer Research
Pharmacology

Background:

Overexpression of the MDR1 gene-encoded P-glycoprotein (Pgp) in tumor cells leads to multidrug resistance (MDR).
Pgp confers resistance to numerous anticancer drugs by actively transporting them out of cells, lowering intracellular drug concentrations.
This phenomenon significantly impacts the efficacy of clinical chemotherapy.

Purpose of the Study:

To explore the relevance of P-glycoprotein (Pgp) in clinical chemotherapy resistance.
To evaluate functional assays as a method for quantifying active Pgp molecules.
To discuss the advantages and disadvantages of functional assays for MDR assessment.

Main Methods:

Measurement of active, adenosine triphosphate (ATP)-dependent drug transport or efflux function of Pgp.
These are referred to as functional assays.
Comparison of functional assays with mRNA and protein expression levels.

Main Results:

Functional assays directly measure the biological activity of Pgp, reflecting its impact on drug resistance.
Expression levels (mRNA or protein) do not always correlate with functional Pgp activity due to other cellular factors.
Specificity, sensitivity, and reproducibility are crucial criteria for the utility of MDR assays.

Conclusions:

Functional assays offer a direct measure of Pgp's drug efflux capability, crucial for understanding MDR.
While expression levels are informative, they may not fully represent the functional impact of Pgp.
The choice of assay for MDR should prioritize specificity, sensitivity, and reproducibility for clinical relevance.