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- W2077462136 abstract "Receptor-stimulated hydrolysis of inositol phospholipids was studied in atrial and ventricular myocytes isolated from guinea-pigs. Membrane phospholipids were labelled with [3H] inositol and their conversion to [3H] labelled inositol phosphate was measured in the presence of Li+ (10 mM). In the absence of added stimulatory hormones or neurotransmitters, little inositol phosphate accumulation was observed. Acetylcholine and carbachol stimulated inositol phosphate accumulation with a maximum of more than 12 times the unstimulated values in atrial myocytes and 7 times in ventricular myocytes. The EC50 values and 95% confidence limits for acetylcholine and carbachol were 0.9 microM (0.2 - 5.3) and 8.8 microM (6.3 - 11.8) in atria and 0.6 M (0.5 - 0.8) and 10.0 M (1.8 - 55.9) in ventricles, respectively. Oxotremorine was a partial agonist in stimulating inositol phosphate accumulation in both atrial and ventricular myocytes. The vasoactive peptides angiotensin II and vasopressin also stimulated inositol phosphate accumulation but the maximum effect was lower than that mediated through muscarinic receptors. However, the adenosine analogues, L-N6-phenylisopropyladenosine and 5'N-ethylcarboxamidoadenosine which, like muscarinic agonists depress cardiac contractility, did not affect inositol phosphate accumulation at concentrations up to 10(-4)M." @default.
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- W2077462136 date "1986-12-01" @default.
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- W2077462136 title "Stimulation of phosphatidylinositol metabolism in atrial and ventricular myocytes" @default.
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- W2077462136 doi "https://doi.org/10.1016/0024-3205(86)90399-1" @default.
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