title: Regulation of Fc gamma receptor subtype expression on a human eosinophilic leukemia cell line EoL-3: participation of cAMP and protein kinase C in the effects of interferon-gamma and phorbol ester.
abstract: We investigated the effects of interferon-gamma (IFN-gamma), phorbol myristate acetate (PMA), and dibutyryl cAMP (Bt2cAMP) on Fc gamma R subtype expression on a human eosinophilic leukemia cell line, EoL-3. Unstimulated EoL-3 cells expressed Fc gamma RII as determined by monoclonal antibody (mAb) IV-3, whereas there was little or no Fc gamma RI and Fc gamma RIII expression as determined by mAbs 32.2 and 3G8, respectively. IFN-gamma induced Fc gamma RI expression, and Bt2 cAMP, which did not induce Fc gamma RI expression by itself, showed an additive effect on IFN-gamma-induced Fc gamma RI expression. Fc gamma RII expression was augmented by IFN-gamma, PMA, and Bt2 cAMP. Bt2 cAMP also showed an additive effect on IFN-gamma-augmented Fc gamma RII expression. Fc gamma RIII expression could be induced only by IFN-gamma plus Bt2 cAMP. H-7, a protein kinase C (PK-C) inhibitor, suppressed the enhancement of Fc gamma R subtype expression induced by these reagents. These results show that Fc gamma R subtype expression on EoL-3 cells is regulated differently in each subtype and that cAMP and PK-C play important roles in the regulation.
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Kyoto University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nambu
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
authors.forename: K M
authors.initials: KM
authors.lastname: Kim
authors.forename: M
authors.initials: M
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Mayumi
authors.forename: H
authors.initials: H
authors.lastname: Mikawa
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation / Q000145:classification / Q000378:metabolism*; D003994:Bucladesine / Q000494:pharmacology; D002118:Calcium / Q000502:physiology; D000242:Cyclic AMP / Q000502:physiology*; D003907:Dexamethasone / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004804:Eosinophils / Q000276:immunology*; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000494:pharmacology*; D007546:Isoquinolines / Q000494:pharmacology; D015472:Leukemia, Eosinophilic, Acute / Q000276:immunology / Q000473:pathology; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000502:physiology*; D011961:Receptors, Fc / Q000145:classification / Q000378:metabolism*; D017452:Receptors, IgG; D015398:Signal Transduction; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation; D007074:Immunoglobulin G; D007546:Isoquinolines; D010879:Piperazines; D011961:Receptors, Fc; D017452:Receptors, IgG; D003994:Bucladesine; D003907:Dexamethasone; D007371:Interferon-gamma; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000242:Cyclic AMP; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium