The permeability of aconitine-modified sodium channels to univalent cations in myelinated nerve

G. N. Mozhayeva, A. P. Naumov, Yu A. Negulyaev, E. D. Nosyreva

Research output: Contribution to journalArticle

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Abstract

1. 1. Ionic currents through the sodium system of nodes of Ranvier treated with aconitine were measured under voltage clamp conditions in a Ringer solution containing Na+ or an equimolar amount of various test cations. 2. 2. Average shifts in reversal potentials in nodes of Ranvier treated with aconitine with NH4 +, Li+, K+, Rb+, Cs+ in place of Na+ in the Ringer solution are 7.6, -6.8, -25.0, -41.0 and -51.5 mV at 13-14°C. At 20-22°C the sequence of shifts is 7.5, -5.5, -13.5, -29.0 and -41.0 mV. For Tl+ the average reversal potential shift is +3 mV at 20-22°C. 3. 3. The slope of the instantaneous current-voltage relation at the reversal potential in nodes treated with aconitine changed with the various cations tested. The ratios are NH4 +/Na+/K+/Rb+/Cs+/Li+ = 1.14 : 1.0 : 0.80 : 0.67 : 0.53 : 0.53. 4. 4. Using a three energy barrier model some of the parameters for the aconitine-modified Na+ channels were estimated (Chizmadgev, Yu. A., Khodorov, B.I. and Aityan, S.Kh. (1974) Bioelectrochem. Bioenerg. 1, 301-312).

Original languageEnglish (US)
Pages (from-to)461-473
Number of pages13
JournalBBA - Biomembranes
Volume466
Issue number3
DOIs
StatePublished - May 2 1977

Fingerprint

Aconitine
Sodium Channels
Cations
Permeability
Ranvier's Nodes
Energy barriers
Clamping devices
Electric potential
Sodium

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology
  • Medicine(all)

Cite this

The permeability of aconitine-modified sodium channels to univalent cations in myelinated nerve. / Mozhayeva, G. N.; Naumov, A. P.; Negulyaev, Yu A.; Nosyreva, E. D.

In: BBA - Biomembranes, Vol. 466, No. 3, 02.05.1977, p. 461-473.

Research output: Contribution to journalArticle

Mozhayeva, G. N. ; Naumov, A. P. ; Negulyaev, Yu A. ; Nosyreva, E. D. / The permeability of aconitine-modified sodium channels to univalent cations in myelinated nerve. In: BBA - Biomembranes. 1977 ; Vol. 466, No. 3. pp. 461-473.
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