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- W2004538350 abstract "It was recently observed that the relaxation induced by glyceryl trinitrate (GTN) showed a biphasic concentration-response curve; a high-sensitivity component represented by concentrations < 1 nM and a low-sensitivity component represented by concentrations > 1 nM. The effect of two glyceryl trinitrate concentrations (0.1 nM and 1 μM) were tested on the uptake of 45Ca2+ to tissue pieces of bovine mesenteric arteries (BMA) as well as on the uptake of 45Ca2+ to a microsomal preparation of BMA. The effect of GTN and 8-Br-cGMP was also studied on the IP3-induced release of Ca2+ from the microsomal preparation preloaded with 45Ca2+. The influence of IP3 and GTN on the activity of Ca2+-ATPase in the microsomal preparation was tested as well. The phenylephrine-stimulated uptake of Ca2+ to tissue pieces of BMA was significantly reduced by the high GTN-concentration (1 μM) but not by the lower concentration. The uptake of Ca2+ to the microsomal preparation was significantly stimulated by the two GTN-concentrations tested, as well as by 8-Br-cGMP (0.1 mM). The calcium release induced by IP3 (1 μM) from the microsomal preparation was inhibited by both the low and the high GTN-concentration and by 8-Br-cGMP (0.1 mM). The Ca2+-ATPase activity was stimulated by both GTN-concentrations tested while it was inhibited by IP3. It is concluded that GTN is able to induce a reduction of the free intracellular Ca2+ by several mechanisms, which are of importance for the relaxation represented by the high-affinity component. The low-affinity component in addition reduces the inflow of Ca2+ over the plasma membrane." @default.
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- W2004538350 date "1990-04-01" @default.
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- W2004538350 title "Studies of the Effect of Glyceryl Trinitrate and Cyclic GMP on Calcium Turnover in Bovine Mesenteric Artery" @default.
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- W2004538350 doi "https://doi.org/10.1111/j.1600-0773.1990.tb00747.x" @default.
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