title: Suppression of IgA production by lymphocytes induced by diphenylhydantoin.
abstract: In this study, the mechanisms for suppression of immunoglobulin production by lymphocytes induced by diphenylhydantoin (DPH) were investigated using peripheral blood mononuclear cells from one patient 3 months after discontinuation of DPH, when IgA deficiency was improved. Immunoglobulin production in PBMCs was dose-dependently suppressed by DPH and the suppressive effect of DPH on IgA production tended to be greater than the effect on IgM or IgG production. Moreover, cell separation experiments indicated that DPH suppresses immunoglobulin production by PBMCs through a suppression of B cell, but not T cell, function. The finding that the suppressive effect of DPH on IgA production tended to be greater than the effect on IgM or IgG production might be related to the fact that the alpha-chain gene is located in the 3' end of the gene coding the constant regions of human heavy chains.
authors.affiliation: Department of Pediatrics, Gifu University School of Medicine, Gifu, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kondo
authors.forename: A
authors.initials: A
authors.lastname: Takao
authors.forename: S
authors.initials: S
authors.lastname: Tomatsu
authors.forename: N
authors.initials: N
authors.lastname: Shimozawa
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Ogawa
authors.forename: H
authors.initials: H
authors.lastname: Iwata
authors.forename: T
authors.initials: T
authors.lastname: Orii
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D002478:Cells, Cultured; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000096:biosynthesis*; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007136:Immunoglobulins / Q000096:biosynthesis*; D010672:Phenytoin / Q000009:adverse effects*; D011043:Pokeweed Mitogens / Q000494:pharmacology; D013601:T-Lymphocytes / Q000187:drug effects* / Q000276:immunology
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins; D011043:Pokeweed Mitogens; D010672:Phenytoin