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- W2048603547 abstract "IgE-mediated down-regulation of secretion from basophils and mast cells is an important component of the overall cellular response that determines the ultimate extent of mediator release. The down-regulatory process that occurs during active secretion has also been associated with the methodological phenomenon called desensitization, but the mechanisms underlying desensitization are not understood. A variety of studies have suggested that activation of protein kinase C (PKC) results in down-regulation of IgE-mediated secretion so we have examined the effect of the PKC inhibitors Ro-31-8220 (3-[1-[3-amidinothio)propyl-1H-indol-3-yl]-3-(1-methyl-1H-indol-3- yl) maleimide) and bis-indolylmaleimide II on desensitization in human basophils. At concentrations that have been shown previously to inhibit PKC-mediated functions in basophils completely, these two drugs had no effect on IgE-mediated desensitization. We did find, however, that the src-family kinase inhibitors PP1 [4-amino-5-(4-methylphenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine] and PP2 [4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3, 4-d]pyrimidine] inhibited desensitization as well as secretion. These data suggest that PKC has little role in down-regulating the IgE-mediated basophil response. However, like the activation signaling cascade, the desensitization process is dependent on the activation of src family kinases." @default.
- W2048603547 created "2016-06-24" @default.
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- W2048603547 date "2000-12-01" @default.
- W2048603547 modified "2023-09-27" @default.
- W2048603547 title "Pharmacology of IgE-mediated desensitization of human basophils: effects of protein kinase C and Src-family kinase inhibitors" @default.
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- W2048603547 doi "https://doi.org/10.1016/s0006-2952(00)00490-1" @default.
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