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- W2023681723 abstract "Beta-adrenergic-stimulated parotid secretion is believed to be mediated by activation of the cAMP-dependent protein kinase (PK-A). However, the relative roles of the type I and II PK-A isoenzymes are still unclear. Combinations of site-selective, lipophilic cAMP analogues that synergistically activate each PK-A were used to investigate this problem. The selectivity of synergistic activation with these combinations was verified with the partially purified parotid PK-A isoenzymes, using kemptide as a substrate. Synergism in activation of PK-AII was only seen with 8-thiomethyl cAMP (8-TM) and N-6-benzoyl cyclic AMP (N6B), while PK-AI was only synergistically activated by 8-(6-aminohexyl) amino cyclic AMP (AHA) and N6B. Additive activation of each isoenzyme was observed for the combination of 8-TM and AHA. Rates of amylase secretion from dispersed parotid acini in response to secretagogues were determined with a coupled enzyme assay for amylase activity, which was adapted for use in a microplate reader. Cells were stimulated to secrete during 30 min with different doses (0.1-1.0 mM) and combinations of the cyclic nucleotide analogues. Alone, N6B was most effective in stimulating amylase secretion. The basal amylase secretory rate was stimulated by these secretagogues (0.44 mM) to the following extent: 53-fold (N6B), 8-fold (8-AHA), 2-fold (8-TM). In combination at a series of concentrations, only 8-TM + N6B produced synergistic stimulation of secretion, while AHA + N6B and 8-TM + AHA did not.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2023681723 created "2016-06-24" @default.
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- W2023681723 date "1992-02-01" @default.
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- W2023681723 title "Stimulation of rat parotid secretion by cAMP analogues that synergistically activate the type II isoenzyme of the cAMP-dependent protein kinase" @default.
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- W2023681723 doi "https://doi.org/10.1016/0003-9969(92)90002-p" @default.
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