title: Role of protein kinase C during interferon-gamma- and phorbol ester-stimulated immunocytochemical expression of ICAM-1 in human renal carcinoma cells.
abstract: Incubation of the human renal carcinoma cell line CaKi-1 with interferon-gamma (IFN-gamma) or the phorbol ester, phorbol-12-myristate 13-acetate (PMA) strongly stimulated the immunocytochemical expression of the intercellular adhesion molecule-1 (ICAM-1) in a dose-dependent manner. Since PMA is capable of activating the Ca2+/phospholipid-dependent protein kinase C (PKC), we investigated the role of this kinase during IFN-gamma signal transduction. Calcium ionophore A23187 significantly enhanced IFN-gamma- and PMA-induced ICAM-1 staining. While staurosporine, H7 and sphingosine, three known PKC inhibitors, blocked the PMA effect, only staurosporine abrogated the action of IFN-gamma. Finally, 24 h of PMA pretreatment with subsequent IFN-gamma stimulation enhanced ICAM-1 staining above values from cultures where IFN-gamma was omitted. This occurred despite the fact that 24 h of PMA pretreatment abolished the effect of IFN-gamma on PKC activation, as determined by acetylated myelin basic protein 4-14 phosphorylation. In conclusion, these results suggest that additional events other than PKC activation are required for complete regulation of ICAM-1 antigen by IFN-gamma in the whole cell population. Hence, other Ca(2+)-dependent signalling pathway(s) mediated by IFN-gamma receptors must act. Further studies are needed to elucidate these specific pathway(s) activated during IFN-gamma stimulation in our model.
authors.affiliation: Department of Pathology, Herlev Hospital, University of Copenhagen, Denmark.
authors.forename: A B
authors.initials: AB
authors.lastname: Hansen
authors.forename: P N
authors.initials: PN
authors.lastname: Bouchelouche
authors.forename: B N
authors.initials: BN
authors.lastname: Giese
authors.forename: C B
authors.initials: CB
authors.lastname: Andersen
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000470:Alkaloids / Q000494:pharmacology; D015703:Antigens, CD / Q000096:biosynthesis*; D000001:Calcimycin / Q000494:pharmacology; D002292:Carcinoma, Renal Cell / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D007150:Immunohistochemistry; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma / Q000494:pharmacology; D007546:Isoquinolines / Q000494:pharmacology; D007680:Kidney Neoplasms / Q000378:metabolism*; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000502:physiology*; D011994:Recombinant Proteins / Q000494:pharmacology; D015398:Signal Transduction; D013110:Sphingosine / Q000494:pharmacology; D019311:Staurosporine; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000470:Alkaloids; D015703:Antigens, CD; D015815:Cell Adhesion Molecules; D007546:Isoquinolines; D010879:Piperazines; D011994:Recombinant Proteins; D018799:Intercellular Adhesion Molecule-1; D000001:Calcimycin; D007371:Interferon-gamma; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D011493:Protein Kinase C; D019311:Staurosporine; D013110:Sphingosine; D013755:Tetradecanoylphorbol Acetate