MDR1 EFFLUX ASSAY

MDR1 EFFLUX ASSAY

Stock Code: 3586921
Manufacturer Part No: ECM910
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Application


The Multidrug Resistance Direct Dye Efflux Activity Kit is designed to directly measure the functional activity of MDR1, MRP1 and BCRP by assaying for the ability of the cell to extrude fluorescent transport substrates of these proteins. The kit can be used to measure relative amounts of MDR1, MRP and BCRP activity between different cell populations. In addition, dye efflux assays can be used to assess the ability of unlabeled small molecules to serve as transport substrates for MDR1, MRP1 and BCRP and the ability of candidate inhibitors to block the function of these proteins.

Two conveniently formulated solutions of MDR1, MRP1 and BCRP substrate dyes, DiOC2(3) Solution and Rhodamine 123 Solution, are included in the kit to give the investigator flexibility in the substrate specificity of the efflux probe. In addition, a solution of a nonfluorescent substrate of MDR1 and MRP1, Vinblastine Solution, is provided to serve as a competitive inhibitor of dye efflux. DMSO is included as a diluent control for the Vinblastine Solution. Sterile, concentrated RPMI-1640 and BSA are provided as components for buffer for the loading, efflux and washing steps of the procedure. A sterile, concentrated solution of gentamicin, which has been shown to not be a substrate for MDR1 (Mechetner and Roninson, 1992), is supplied as an optional antibiotic for the buffer. Propidium iodide solution is included to identify dead cells and exclude them from the analysis.

The extent of efflux of fluorescent dyes is best analyzed by flow cytometry. The assay can also be incorporated with immunostaining experiments for multicolor analysis of cell surface marker expression and MDR1, MRP1 and BCRP function. Efflux mediated by MDR1, MRP1 and BCRP can also be quantified by analysis under a fluorescence microscope or on a fluorometric plate reader.

The efflux activity of MDR1 and its relatives is highly temperature sensitive. MDR1 functions optimally near 37°C, but is effectively inactive at 4°C. MDR1-expressing cells preloaded with MDR1 fluorescent substrates retain the dye and consequently have high fluorescence when incubated at 4°C (Figure 1, 4°C, top panels). Conversely, cells incubated at 37°C more readily efflux the dye and show reduced fluorescence (Figure 1, 37°C + DMSO, middle panels). The kit also includes a specific inhibitor vinblastine, which is also a substrate for MDR1 and competitively blocks efflux of DiOC2(3) and Rhodamine 123. Inclusion of excess vinblastine in the efflux reaction at 37°C therefore results in high fluorescence (Figure 1, 37°C + vinblastine, bottom panels).

For Research Use Only; Not for use in diagnostic or in vivo procedures


Research CategoryCell Structure


The Multidrug Resistance Direct Dye Efflux Assay Kit includes two of the best characterized & most commonly used multidrug resistance ABC transporter substrates, DiOC2(3) & rhodamine 123.


Components


Sterile 5x RPMI-1640 (Part No. 90302) - One bottle containing 200 ml of sterile 5x concentrated RPMI-1640.Sterile 30% BSA (Part No. 90303) - One bottle containing 35 ml sterile-filtered 30% bovine serum albumin (BSA) in PBS.Gentamicin Solution, 1000x (Part No. 90353) - One vial containing 1 ml sterile-filtered 50 mg/ml gentamicin.DiOC2(3) Solution (Part No

Quality Level100
ManufacturerSIGMA-ALDRICH
Technique(s)cell based assay: suitable

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