title: Effect of 5637-conditioned medium and recombinant cytokines on P-glycoprotein expression in a human GM-CSF-dependent leukemic myeloid cell line.
abstract: This study was aimed at evaluating the influence of 5637-conditioned medium (5637-CM) and human recombinant cytokines on both expression and function of P-glycoprotein (P-gp) in TF-1, a GM-CSF/IL-3-dependent acute myeloid leukemia cell line which constitutively expresses functional P-gp. P-gp expression was measured by flow cytometry using MRK16 monoclonal antibody. P-gp function was measured by rhodamine 123 (Rh 123) efflux kinetics. When TF-1 cells were cultured with 5637-CM (50% v/v), both P-gp expression and P-gp efflux capacity were increased in a time-dependent manner with a 4-fold increase in P-gp expression level at day 6 whereas TF-1 cell differentiation status remained unchanged as assessed by morphological studies, phenotypical and cytochemistry analysis. Recombinant cytokines including GM-CSF, G-CSF, IL-1 beta, IL-6, stem cell factor, LIF, erythropoietin, and IL-3 had no effect on P-gp expression whereas TNF alpha induced dose- and time-dependent P-gp and mdr-1 gene overexpression. However, TNF alpha-induced P-gp overexpression had no influence on P-gp efflux capacity. Furthermore, when TF-1 cells were exposed to IL-3 for periods longer than 1 month, we found that P-gp efflux capacity was increased as compared to cells cultured with GM-CSF whereas P-gp expression was unchanged. Both TNF alpha and IL-3 did not induce TF-1 differentiation. Collectively, these results suggest that cytokines may influence both expression and function of P-gp in TF-1 cells without interfering with their differentiation status. In contrast to cytokines, phorbol esters enhanced expression and efflux capacity of P-gp in parallel with TF-1 cell monocytic differentiation. Finally, our study suggests that paracrine and/or autocrine secretion of cytokines may interfere with P-gp activity in some acute myeloid leukemia cells.
authors.affiliation: Laboratoire de Pharmacologie et de Toxicologie Fondamentales, CNRS, Centre Claudius Regaud, Toulouse, France.
authors.forename: J D
authors.initials: JD
authors.lastname: Bailly
authors.forename: P
authors.initials: P
authors.lastname: Pourquier
authors.forename: J P
authors.initials: JP
authors.lastname: Jaffrézou
authors.forename: E
authors.initials: E
authors.lastname: Duchayne
authors.forename: G
authors.initials: G
authors.lastname: Cassar
authors.forename: C
authors.initials: C
authors.lastname: Bordier
authors.forename: G
authors.initials: G
authors.lastname: Laurent
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology; D001483:Base Sequence; D002454:Cell Differentiation / Q000187:drug effects; D017077:Culture Media, Conditioned / Q000737:chemistry / Q000494:pharmacology*; D016207:Cytokines / Q000494:pharmacology*; D018432:Drug Resistance, Multiple / Q000235:genetics; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology; D007377:Interleukin-3 / Q000494:pharmacology; D015470:Leukemia, Myeloid, Acute / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D001749:Urinary Bladder Neoplasms
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D017077:Culture Media, Conditioned; D016207:Cytokines; D007375:Interleukin-1; D007377:Interleukin-3; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D016179:Granulocyte Colony-Stimulating Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D013755:Tetradecanoylphorbol Acetate