Effect of Trace Levels of Nigericin on Intracellular pH and Acid-Base Transport in Rat Renal Mesangial Cells
| Autor: | Mark O. Bevensee, Walter F. Boron, Esther Bashi |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Intracellular Fluid
endocrine system Nigericin Physiology Intracellular pH Detergents Biophysics Ionophore chemistry.chemical_compound Albumins Extracellular Animals Cells Cultured Ethanol Chromatography Ionophores Sodium Biological Transport Cell Biology Hydrogen-Ion Concentration Fluorescence Glomerular Mesangium Rats Perfusion chemistry Potassium Intracellular |
| Zdroj: | Journal of Membrane Biology. 169:131-139 |
| ISSN: | 1432-1424 0022-2631 |
| Popis: | Nigericin is an ionophore commonly used at the end of experiments to calibrate intracellularly trapped pH-sensitive dyes. In the present study, we explore the possibility that residual nigericin from dye calibration in one experiment might interfere with intracellular pH (pHi) changes in the next. Using the pH-sensitive fluorescent dye 2', 7'-bis(carboxyethyl)-5,6-carboxyfluorescein (BCECF), we measured pHi in cultured rat renal mesangial cells. Nigericin contamination caused: (i) an increase in acid loading during the pHi decrease elicited by removing extracellular Na+, (ii) an increase in acid extrusion during the pHi increase caused by elevating extracellular [K+], and (iii) an acid shift in the pHi dependence of the background intracellular acid loading unmasked by inhibiting Na-H exchange with ethylisopropylamiloride (EIPA). However, contamination had no effect on the pHi dependence of Na-H exchange, computed by adding the pHi dependencies of total acid extrusion and background acid loading. Nigericin contamination can be conveniently minimized by using a separate line to deliver nigericin to the cells, and by briefly washing the tubing with ethanol and water after each experiment. |
| Databáze: | OpenAIRE |
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