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- W2028996539 abstract "31P NMR was used to resolve and determine the relative quantity and mobility of ATP in the cytosolic and vesicular compartments of isolated adrenomedullary chromaffin cells. The cells were cultured on microcarrier beads and superfused with an oxygenated medium--thereby permitting dense suspensions of viable cells to be maintained in the NMR probe for extended time periods. Under these conditions, distinct 31P signals could be seen for ATP within the vesicular and the cytosolic pools. Comparison of the integrated areas of the beta-phosphate resonances from the two ATP pools indicated 77% of the endogenous ATP was in the vesicular pool. From this observation and the assumption that the concentration of ATP in the vesicle is 87.5 mM, the concentration of ATP calculated to be in the cytoplasmic pool was approximately 4 mM. The pH in the vesicle determined from the chemical shift of the gamma-phosphate resonance of vesicular ATP was 5.84 +/- 0.17 (n = 6), slightly higher than the intragranular pH measured in hypoxic cells (5.57 +/- 0.15, n = 8). Spin-lattice relaxation times of ATP 31P resonances in the vesicular pool were from 12 to 14 times shorter than the ATP resonances in the cytosol, corresponding to a decrease in molecular mobility due to incorporation of ATP within a catecholamine-storage complex." @default.
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- W2028996539 title "31P nuclear magnetic resonance study of the metabolic pools of adenosine triphosphate in cultured bovine adrenal medullary chromaffin cells." @default.
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- W2028996539 doi "https://doi.org/10.1073/pnas.86.7.2239" @default.
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