title: Interleukin-1 beta inhibits Ca2+ channel currents in hippocampal neurons through protein kinase C.
abstract: Interleukin-1 beta depresses the voltage-gated Ca2+ channel currents in acutely dissociated guinea-pig hippocampal CA1 neurons. This depression is observed with pathophysiological concentrations found in the cerebrospinal fluid (> or = 1.0 pg interluekin-1 beta/10 microliters). Interleukin-1 receptor antagonist (in concentrations 25-fold higher than interleukin-1 beta) completely blocked the interleukin-1 beta-induced depression of the Ca2+ channel current. This suggests that interleukin-1 beta action is through a specific interaction with an interleukin-1 membrane receptor site. The application of other cytokines and growth factors (interleukin-6, epidermal growth factor, and basic fibroblast growth factor), or bacterial lipopolysaccharide (endotoxin) had no effect, indicating specificity of action of interleukin-1 beta. The depression of the Ca2+ channel current by interleukin-1 beta was prevented by the extracellular application of pertussis toxin, and by the intracellular application of GDP[beta S], H-7, staurosporine or bisindolylmaleimide. Application of phorbol 12-myristate 13-acetate also depressed the Ca2+ channel current, but this phorbol ester-induced depression was not additive to that induced by interleukin-1 beta. These results suggest mediation of interleukin-1 beta action through a pertussis toxin-sensitive G-protein coupled interleukin-1 receptor associated with the activation of protein kinase C. The depression of the Ca2+ channel current by interleukin-1 beta may be involved in the regulation of neuronal excitability during pathological conditions and in the induction and/or progression of neurodegenerative processes.
authors.affiliation: School of Life and Health Sciences, University of Delaware, Newark 19716.
authors.forename: C R
authors.initials: CR
authors.lastname: Plata-Salamán
authors.forename: J M
authors.initials: JM
authors.lastname: ffrench-Mullen
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000470:Alkaloids / Q000494:pharmacology; D000818:Animals; D015220:Calcium Channels / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004594:Electrophysiology; D019204:GTP-Binding Proteins / Q000378:metabolism; D006153:Guanosine Diphosphate / Q000494:pharmacology; D006168:Guinea Pigs; D006624:Hippocampus / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D007375:Interleukin-1 / Q000494:pharmacology*; D007546:Isoquinolines / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects*; D037342:Pertussis Toxin; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D019311:Staurosporine; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
chemical_list: D000470:Alkaloids; D015220:Calcium Channels; D007375:Interleukin-1; D007546:Isoquinolines; D010879:Piperazines; D010566:Virulence Factors, Bordetella; D006153:Guanosine Diphosphate; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D037342:Pertussis Toxin; D011493:Protein Kinase C; D019204:GTP-Binding Proteins; D019311:Staurosporine; D013755:Tetradecanoylphorbol Acetate