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Determination of Reference Values of MDR‐ABC Transporter Activities in CD3+ Lymphocytes of Healthy Volunteers Using a Flow Cytometry Based Method
Author(s) -
Szerémy Péter,
Tauberné Jakab Katalin,
Baráth Sándor,
Apjok András,
Filkor Kata,
Holló Zsolt,
MárkiZay János,
Kappelmayer János,
Sipka Sándor,
Krajcsi Péter,
Toldi Gergely
Publication year - 2019
Publication title -
cytometry part b: clinical cytometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 61
eISSN - 1552-4957
pISSN - 1552-4949
DOI - 10.1002/cyto.b.21729
Subject(s) - flow cytometry , atp binding cassette transporter , cd3 , population , verapamil , microbiology and biotechnology , pharmacology , cytometry , biology , immunology , chemistry , medicine , transporter , biochemistry , immune system , cd8 , environmental health , gene , calcium
Background MDR transporters are important biomarkers of drug resistance in cancer and in autoimmune conditions. We determined the MDR1, MRP1 and BCRP activity in CD3+ lymphocytes using a flow cytometry based method from 120 healthy volunteers in order to describe normal reference values of the activity of these transporters. The effects of gender and age were also determined. Methods The Solvo MDQ Kit™ was used for measurements. In this assay, fluorescent reporter substrates (Calcein‐AM for MDR1 and MRP1 and mitoxantrone for BCRP, respectively) are trapped in the cytoplasm and pumped out by MDR proteins depending on the presence or absence of specific inhibitors (verapamil for MDR1 and MRP1, indomethacin for MRP1 and KO134 for BCRP, respectively), allowing for quantitative, standardized assessment. Cell surface staining was applied to select CD3+ cells. Results MAF values of MRP1 and BCRP are independent from age. MAFC and MAF of MDR1 show negative correlation with the age of the studied subjects ( P = 0.003, r = −0.27 and P = 0.0001, r = −0.34, respectively). No difference was detected in any of the four MAF values between men and women. Gender does not affect the presence or lack of correlation between MAF values and age. Conclusions The determination of the functional activity of MDR‐ABC transporters is achievable using a flow cytometry based standardized method. Having established the normal range of MAF values on CD3+ lymphocytes of a healthy population, our results allow for the development of novel flow cytometry based diagnostic tools. © 2018 International Clinical Cytometry Society