Abstract
RBL 2H3 cells, a model for mast cell function, sensitized with rat IgE, released histamine and peptidoleukotrienes (LT) in response to rabbit anti-rat IgE in a concentration-dependent manner. The calcium ionophore, A23187 also stimulated the release of both mediators but to a greater extent. The protein kinase C activator, 12-O-tetradecanoyl phorbol-13-acetate (TPA) failed to influence mediator release when added alone, but when added with either A23187 or anti-IgE, TPA significantly enhanced the release of both histamine and LT. The effects of anti-IgE, TPA and A23187 were completely inhibited by prior addition of the protein kinase C inhibitors staurosporine and 1-(5-isoquinolinesulfonyl)-2-methylpiperazine dihydrochloride (H7) but not by N-(2-guanidinoethyl)-5-isoquinoline-sulfonamide dihydrochloride (HA1004), a compound which has similar potency to H7 as an inhibitor of some protein kinases but is less potent as a protein kinase C inhibitor. Although other explanations are possible, these results support the hypothesis that the release of histamine and leukotrienes from RBL 2H3 cells resulting from the cross bridging of the IgE receptors, is dependent on activation of protein kinase C.
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Gilfillan, A.M., Wiggan, G.A. & Welton, A.F. The effects of the protein kinase C inhibitors staurosporine and H7 on the IgE dependent mediator release from RBL 2H3 cells. Agents and Actions 30, 418–425 (1990). https://doi.org/10.1007/BF01966307
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DOI: https://doi.org/10.1007/BF01966307