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Pharmacological investigations with different protein kinase C inhibitors on IgE-dependent and IgE-independent activation of human basophils

  • Allergy and Histamine
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Abstract

In the present study different selective inhibitors of the multifunctional serine/threonine kinase protein kinase C (PKC) were investigated on classical activation pathways of basophils in comparison to the nonselective protein kinase inhibitor staurosporine. The potent inhibitors Ro 31-7549, Ro 31-8220, calphostin C and ilmofosine (BM 41.440), which show selectivity for PKCin vitro, significantly potentiated FcεRI-mediated histamine release up to 50% vs. controls at concentrations >10−7 μmol/l but were without any intrinsic histamine releasing activity. Direct activation of cellular PKC by phorbol ester was suppressed by all compounds apart from ilmofosine at the same concentrations. We did not observe statistically significant effects of selective PKC inhibitors on exocytosis induced by the peptide formylmeth-leu-phe (FMLP) or the ionophore A23187, whereas staurosporine potentiated the FMLP-induced histamine release in a dose-dependent fashion: maximum potentiation was 63.5±8.9% vs. control at 1 μmol/l (n=4). The findings suggest that PKC exhibits differential functions during biochemical events of stimulus-secretion coupling in human basophils supposedly by its distinct subtypes. With respect to the present data, TPA-induced and IgE-mediated signals are not closely correlated.

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  1. Department of Dermatology, Medical University of Lübeck, Ratzeburger Alle 160, D-23538, Lübeck, Germany

    U. Amon, E. von Stebut & H. H. Wolff

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  1. U. Amon
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  2. E. von Stebut
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  3. H. H. Wolff
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Amon, U., von Stebut, E. & Wolff, H.H. Pharmacological investigations with different protein kinase C inhibitors on IgE-dependent and IgE-independent activation of human basophils. Agents and Actions 39, 13–19 (1993). https://doi.org/10.1007/BF01975708

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  • DOI: https://doi.org/10.1007/BF01975708

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