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. 1968 Feb 1;51(2):221–236. doi: 10.1085/jgp.51.2.221

Charges and Potentials at the Nerve Surface

Divalent ions and pH

Bertil Hille 1
PMCID: PMC2201126  PMID: 5641636

Abstract

The voltage dependence of the voltage clamp responses of myelinated nerve fibers depends on the concentration of divalent cations and of hydrogen ions in the bathing medium. In general, increases of the [Ca], [Ni], or [H] increase the depolarization needed to elicit a given response of the nerve. An e-fold increase of the [Ca] produces the following shifts of the voltage dependence of the parameters in the Hodgkin-Huxley model: m ∞, 8.7 mv; h ∞, 6.5 mv; τn, 0.0 mv. The same increase of the [H], if done below pH 5.5, produces the following shifts: m ∞, 13.5 mv; h ∞, 13.5 mv; τn, 13.5 mv; and if done above pH 5.5: m ∞, 1.3 mv; h ∞, 1.3 mv; τn, 4.0 mv. The voltage shifts are proportional to the logarithm of the concentration of the divalent ions and of the hydrogen ion. The observed voltage shifts are interpreted as evidence for negative fixed charges near the sodium and potassium channels. The charged groups are assumed to comprise several types, of varying affinity for divalent and hydrogen ions. The charges near the sodium channels differ from those near the potassium channels. As the pH is lowered below pH 6, the maximum sodium conductance decreases quickly and reversibly in a manner that suggests that the protonation of an acidic group with a pKa of 5.2 blocks individual sodium channels.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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