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A bioanalytical assay for the topical corticosteroid clobetasol propionate was developed and validated. For the quantitative assay 0.5ml human serum samples, supplemented with clobetasone butyrate as internal standard, were extracted with hexane–ether. Evaporated and reconstituted extracts were injected on a polar embedded octadecyl silica column with isocratic elution using formic acid in water–methanol...
In KB cells, interleukin-1 (IL-1), epidermal growth factor and phorbol ester transiently activated both MAP kinase and a serine kinase which phosphorylated the heat shock protein hsp27. Extracts made from IL-1-stimulated KB cells phosphorylated recombinant hsp27, in vitro, on serine residues 78 and 82 which are contained within Arg-X-X-Ser motifs similar to those phosphorylated by the ribosomal protein...
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