Abstract
The combination of confocal laser scan microscopy and the pH-sensitive fluorescent dye BCECF allowed us to record simultaneously intracellular pH, cell viability and relative cell volume. pH was measured by using the pH-sensitive excitation wavelength at 488 nm and the pH-independent excitation wavelength at 442 nm to obtain ratio images. Cell volume was traced by measuring fluorescence dye concentration at 442 nm. Isolated villus tip rat duodenal enterocytes were exposed to 20 mM NH4Cl, sodium free, or 1 mM amiloride buffer. Sodium free buffer and amiloride buffer acidified the cells. Cell volume did not change in sodium free buffer, or NH4Cl exposure, but amiloride led to an increase in cell volume of 20%. After acidification of the duodenal cells, amiloride buffer increased cell volume by almost 50%. These studies revealed that cell volume regulation during pH changes in short-living cells could easily be detected by confocal microscopy and BCECF.
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References
Benos D (1982) Amiloride: a molecular probe of sodium transport in tissues and cells. Am J Physiol 242:C131–C145
Fisher RS, Lockard JW (1988) Complex response of epithelial cells to inhibition of Na+ transport by amiloride. Am J Physiol 254:C297–C303
Grinstein S, Cohen S, Goetz JD, Rothstein A (1985) Na+/H+ exchange in volume regulation and cytoplasmic pH homeostasis in lymphocytes. Fed Proc 44:2508–2512
Grinstein S, Woodside M, Sardet C, Pouyssegur J, Rotin D (1992) Activation of the Na+/H+ antiporter during cell volume regulation. Evidence for a phosphorylation-independent mechanism. J Biol Chem 267:23823–23828
Hartmann F, Owen R, Bissell M (1982) Characterization of isolated epithelial cells from rat small intestine. Am J Physiol 242:G147–G155
Isenberg JI, Ljungstrom M, Safsten B, Flemstrom G (1993) Proximal duodenal enterocyte transport: evidence of Na+-H+ and Cl−-HCO3 − exchange and NaHCO3 cotransport. Am J Physiol 265:G677–G685
Muallem S, Zhang BX, Loessberg PA, Star RA (1992) Simultaneous recording of cell volume changes and intracellular pH or Ca2+ concentration in single osteosarcoma cells UMR-106-01. J Biol Chem 267:17658–17664
Paradiso AM, Tsien RY, Machen TE (1984) Na+/H+ exchange in gastric glands as measured with a cytoplasmic-trapped, fluorescent pH indicator. Proc Natl Acad Sci 81:7436–7440
Renner EL, Lake JR, Cragoe EJ, Scharschmidt BF (1988) Amiloride and amiloride analogs inhibit Na+/K+-transporting ATPase and Na+-coupled alanine transport in rat hepatocytes. Biochim Biophys Acta 938:386–394
Strange K, Spring KR (1986) Methods for imaging renal tubule cells. Kidney International 30:192–200
Sundaram U, Knickelbein RG, Dobbins JW (1991) pH regulation in ileum: Na+-H+ and Cl−-HCO3 − exchange in isolated crypt and villus cells. Am J Physiol 260:G440–G449
Tauc M, Le Maout S, Poujeol P (1990) Fluorescent video-microscopy study of regulatory volume decrease in primary culture of rabbit proximal convoluted tubule. Biochim Biophys Acta 1052:278–284
Tinel H, Wehner F, Sauer H (1994) Intracellular Ca2+ release and Ca2+ influx during regulatory volume decrease in IMCD cells. Am J Physiol 267:F130–F138
Tsien RY (1989) Fluorescent indicators of ion concentrations. Methods Cell Biol 30: 127–156
Wang X, Kurtz I (1990) H+/base transport in principal cells characterized by confocal fluorescence imaging. Am J Physiol 259:C365–C373
Weinlich M, Capasso G, Kinne RK (1993) Intracellular pH in renal tubules in situ: single-cell measurements by confocal laserscan microscopy. Pflugers Arch 422:523–529
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Weinlich, M., Heydasch, U., Mooren, F. et al. Simultaneous detection of cell volume and intracellular pH in isolated rat duodenal cells by confocal microscopy and BCECF. Res. Exp. Med. 198, 73–82 (1998). https://doi.org/10.1007/s004330050091
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DOI: https://doi.org/10.1007/s004330050091