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- W2072021981 abstract "Cell volume regulation in the face of osmotic stress is a fundamental activity, and is most critical in brain, which is spatially constrained. Despite the importance of this phenomenon, little is known about volume regulation in the brain, primarily because of the cellular heterogeneity in the tissue. We discribe here simultaneous in vivo31P nuclear magnetic resonance (NMR) measurements of cell volume, intracellular pH and phosphate metabolites during early responses to hyperosmotic stress in C6 glioma cells perfused in NMR-compatible bioreactors. Cell volume was measured using dimethyl methylphosphonate (DMMP) as a probe which has an intracellular NMR resonance shifted upfield from the extracellular resonance. The sensitivity of these measurements allowed 31P NMR spectra to be collected every 30 s. Following an increase in osmolarity from 320 to 480 mOsm by addition of NaCl to the perfusate, C6 glioma cells shrank to 67% of their original volume. We also observed a simultaneous increase of intracellular pH coincident with the decrease in cell volume. The signals from ATP decreased by 10%, but those from phosphocreatine (PCr) increased by 31% after hyperosmotic shock. However, correcting the ATP signals for the decrease in cell volume indicated that its intracellular concentrations increased after treatment. Signals from glycerophosphorylcholine (GPC) and glycerophosphorylethanolamine (GPE) were not changed significantly. This is the first in vivo report of early cellular responses monitored by NMR spectroscopy following hyperosmotic shock in cultured cells." @default.
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- W2072021981 date "1992-09-01" @default.
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- W2072021981 title "In vivo31P NMR study of early cellular responses to hyperosmotic shock in cultured glioma cells" @default.
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- W2072021981 doi "https://doi.org/10.1016/0300-9084(92)90077-r" @default.
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