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• W2068872564 abstract "Mechanisms of atrial natriuretic peptide (ANP) release were studied in neonatal rat heart atrial and ventricular myocytes cultured on Cytodex 3 microcarriers. For simultaneous observations of cytosolic free calcium concentration ([Ca2+]f) and ANP secretion, the culture was packed in a chromatography column, inserted into the cell holder of a spectrofluorometer was perifused with a buffer solution. [Ca2+]f was measured by the fluorescent calcium indicator Fura-2 and ANP in the effluent perfusate by radioimmunoassay. No cell damage was observed and the basal ANP secretion rate and [Ca2+]f were comparable with values obtained by other methods. K(+)-induced depolarization raised [Ca2+]f by 50%, but it rapidly declined again to a steady level 10-20% above the baseline. The calcium channel agonist Bay k8644 elicited a similar temporal pattern of [Ca2+]f changes and 1 microM ionomycin induced a 100-fold increase in [Ca2+]f with a slow re-establishment of the original baseline. None of these stimuli increased the ANP secretion rate of the atrial or ventricular myocytes. Protein kinase C activation by 12-O-tetradecanoyl-phorbol-13-acetate (TPA) stimulated ANP secretion from the atrial myocytes, while the ventricular myocytes were unresponsive to TPA. It is concluded that Ca2+ is not the main mediator in the regulation of ANP release in cultured neonatal heart cells." @default.
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• W2068872564 date "1990-10-01" @default.
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• W2068872564 title "Cytosolic Ca2+ during atrial natriuretic peptide secretion from cultured neonatal cardiomyocytes" @default.
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• W2068872564 doi "https://doi.org/10.1016/0303-7207(90)90128-u" @default.
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