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• W2014749038 abstract "Total internal reflection (TIR) microfluorimetry was established as a method to measure continuously the volume of adherent cells and applied to measure membrane permeabilities in cells transfected with water channel homologs. Cytosol was labeled with the membrane-impermeant fluorophore calcein. Fluorescence was excited by the TIR evanescent field in a thin section of cytosol (approximately 150 nm) adjacent to the cell-substrate interface. Because cytosolic fluorophore number per cell remains constant, the TIR fluorescence signal should be inversely related to cell volume. For small volume changes in Sf-9 and LLC-PK1 cells, relative TIR fluorescence was nearly equal to inverse relative cell volume; deviations from the ideal were modeled theoretically. To measure plasma membrane osmotic water permeability, Pf, the time course of osmotically induced cell volume change was inferred from the TIR fluorescence signal. LLC-PK1 cells expressing the CHIP28 water channel had an HgCl2-sensitive, threefold increase in Pf compared to nontransfected cells (Pf = 0.0043 cm/s at 10 degrees C). Solute permeability was measured from the TIR fluorescence time course in response to solute gradients. Glycerol permeability in Sf-9 cells expressing the water channel homolog GLIP was (1.3 +/- 0.2) x 10(-5) cm/s (22 degrees C), greater than that of (0.36 +/- 0.04) x 10(-5) cm/s (n = 4, p < 0.05) for control cells, indicating functional expression of GLIP. Water and urea permeabilities were similar in GLIP-expressing and control cells. The TIR method should be applicable to the study of water and solute permeabilities and cell volume regulation in cells of arbitrary shape and size." @default.
• W2014749038 created "2016-06-24" @default.
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• W2014749038 date "1995-04-01" @default.
• W2014749038 modified "2023-09-26" @default.
• W2014749038 title "Cell volume measured by total internal reflection microfluorimetry: application to water and solute transport in cells transfected with water channel homologs" @default.
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• W2014749038 doi "https://doi.org/10.1016/s0006-3495(95)80335-8" @default.
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