Cellular Mechanisms of Renal Tubular Ion Transport by Felix Bronner and Arnost Kleinzeller (Eds.)

By Felix Bronner and Arnost Kleinzeller (Eds.)

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4 1 . . . . . . . . . . . 41 45 . 46 INTRODUCTION An ion-selective electrode records a potential which is closely related to the chemical potential of that ion to which the electrode is sensitive. In cells and tissues where there are gradients in both the electrical and chemical potential, one must know the electrical potential at the tip of the electrode to obtain the chemical potential alone. In large cells such as nerve and muscle, this presents no problem, as the ion-selective electrode as well as a micropipet can be inserted into the same cell.

Micro-electrode measurement of the intracellular pH and buffering power of mouse soleus muscle fibres. J . Physiol. (London) 267, 791-810. INTRACELLULAR pH REGULATION IN SNAIL NEURON 29 2. Boron, W. F. (1977). Intracellular pH transients in giant barnacle muscle fibres. A m . J . : Cell Physiol. 233, C61-C73. 3. Boron W . , and De Weer, P. (1976). Active proton transport stimulated by COJ HC03-, blocked by cyanide. Nature (London) 259, 240-241. 4. Russell, J. M. (1978). Effects of ammonium and bicarbonate-CO, on intracellular chloride levels in Aplysia neurons.

In barnacle muscle, however, the “normal” pH, is nearly the same as the threshold, meaning that + H is normally quite low. Thus, although increasing pH, may have the effect of multiplying C # I ~ by a significant factor, the absolute increase in 4Hwill be small, and, hence, pHi will increase by very little. On the other hand, it seems reasonable to assume that under “normal” conditions, a mammalian muscle fiber is exposed to a significant acid load in the form of the production of acid metabolites.

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