By Arnost Kleinzeller, Felix Bronner, Peter S. Aronson and Walter F. Boron (Eds.)

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Additional resources for Na-H Exchange, Intracellular p: H, and Cell Function

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11. An Optical Absorbance Technique for Measuring Intracellular pH A. Optical Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . D. Calibrating the Intracellular Dye. . . E. Comparison of Microelectrode and Dy s ...................... A. Rabbit Proximal Straight Tubule. ........... B. Rabbit Cortical Collecting Tubule. . . . . . . . . . . . . . . . . . . C. Single LLC-PK, Cells in Culture . ............

Blocked the transient acidification. Caffeine-induced Ca release also produced marked acidification (Abercrombie and Roos, 1983). The recovery from this acidification is largely Na independent, but a portion seems to be due to a Na-requiring process (Fig. lB), possibly a Na-H exchange. This is shown by the findings that in the absence of Na, the rate of recovery is slower and is incomplete and that the extracellular acidification in the immediate vicinity of the fibers is less than in the presence of Na (Abercrombie and Roos, 1983).

1985) suggestive of an Na-H exchanger. , 1986). Experiments were performed on both rapidly growing and quiescent cells, with the results being qualitatively the same in both. The first set of experiments (not shown) was designed to detect Na-H activity. In order to minimize the contribution of possible HCO? transport mechanisms on pHi , we conducted these experiments in the nominal absence of HCOy and employed a 32 mM HEPES buffer. As expected, when cells were acid-loaded by prepulsing with NH; (as in Figs.

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