Multidrug resistance-1 in T lymphocytes and natural killer cells of adults with idiopathic thrombocytopenic purpura: effect of prednisone treatment.
High P-glycoprotein-mediated multidrug resistance-1 (P-gp/MDR1) activity in lymphocytes from idiopathic thrombocytopenic purpura (ITP) patients may affect disease outcome. ITP treatment includes glucocorticoids that are substrates of P-gp; hence, P-gp functional activity and antigenic expression were assessed by flow cytometry in T and natural killer (NK) cells from ITP patients before and after prednisone therapy. Herein, patients' T and NK cells did not show increased MDR1 functional activity, whereas P-gp antigenic expression was significantly enhanced in both therapy-free and prednisone-treated patients. Prednisone treatment did not significantly modify the function and expression of MDR1 in T and NK cells of ITP patients.
López-Karpovitch
Xavier
X
Departamento de Hematologia y Oncología, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico, DF, Mexico. xlopezk@quetzal.innsz.mx
Graue
Gerardo
G
Crespo-Solís
Erick
E
Piedras
Josefa
J
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism*; D000328:Adult; D018432:Drug Resistance, Multiple; D005260:Female; D006801:Humans; D007694:Killer Cells, Natural / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D011241:Prednisone / Q000494:pharmacology* / Q000627:therapeutic use*; D016553:Purpura, Thrombocytopenic, Idiopathic / Q000188:drug therapy* / Q000378:metabolism; D013601:T-Lymphocytes / Q000187:drug effects* / Q000378:metabolism
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D011241:Prednisone