title: Ceramide accelerates dephosphorylation of extracellular signal-regulated kinase 1/2 to decrease prostaglandin D(2) production in RBL-2H3 cells.
abstract: In the present study, the effect of ceramide on antigen-stimulated phosphorylation of extracellular signal-regulated kinase (ERK) in the mechanism responsible for regulating production of prostaglandin (PG) D(2) was investigated in the mast cell line, RBL-2H3 cells. Cell-permeable C(6)-ceramide (N-hexanoylsphingosine) suppressed antigen-stimulated phosphorylation of ERK1/2 and p38 mitogen-activated protein kinase. Ceramide also inhibited production of PGD(2) and an increase in the activity of cytosolic phospholipase A(2) (cPLA(2)), whereas it did not influence the tyrosine phosphorylation of major cellular proteins in response to antigen. The ceramide-induced inhibition of ERK1/2 phosphorylation and of cPLA(2) activation was suppressed by orthovanadate, a tyrosine phosphatase inhibitor, but not by okadaic acid, a serine/threonine phosphatase inhibitor. Addition of ceramide to the lysate prepared from antigen-stimulated cells reduced the phosphorylated ERK1/2, and orthovanadate effectively prevented the reduction. These results suggest that ceramide accelerates the dephosphorylation of phosphorylated ERK1/2 via activation of a protein tyrosine phosphatase, thus preventing activation of cPLA(2) and production of PGD(2).
authors.affiliation: Department of Pathological Biochemistry, Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kitatani
authors.forename: S
authors.initials: S
authors.lastname: Akiba
authors.forename: M
authors.initials: M
authors.lastname: Hayama
authors.forename: T
authors.initials: T
authors.lastname: Sato
mesh_terms: D000818:Animals; D000941:Antigens / Q000096:biosynthesis; D016718:Arachidonic Acid / Q000378:metabolism; D002460:Cell Line; D002518:Ceramides / Q000378:metabolism / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D015151:Immunoblotting; D008407:Mast Cells / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D019319:Okadaic Acid / Q000494:pharmacology; D010739:Phospholipase D / Q000378:metabolism; D010741:Phospholipases A / Q000378:metabolism; D010766:Phosphorylation; D015230:Prostaglandin D2 / Q000096:biosynthesis*; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism; D051381:Rats; D014407:Tumor Cells, Cultured; D014443:Tyrosine / Q000378:metabolism; D014638:Vanadates / Q000494:pharmacology; D048051:p38 Mitogen-Activated Protein Kinases
chemical_list: D000941:Antigens; D002518:Ceramides; C101954:N-caproylsphingosine; D019319:Okadaic Acid; D016718:Arachidonic Acid; D014638:Vanadates; D014443:Tyrosine; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D010741:Phospholipases A; D017027:Protein Tyrosine Phosphatases; C105606:phospholipase D2; D010739:Phospholipase D; D015230:Prostaglandin D2