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Morphine decreases the voltage sensitivity of slow sodium channels

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Abstract

Cell membrane recordings were made in conditions of voltage clamping with tight attachment of the microelectrode—patch clamping— to study the effects of morphine on tetrodotoxin-resistant (TTXr) sodium channels in rat spinal ganglion neurons in culture. The effects of a number of biologically active substances which regulate the receptor-mediated actions of morphine were studied. The effects of morphine were found to involve a chain of sequential reactions leading to decreases in the transfer of effective charge (Zeff) by the activatory gate system of TTXr sodium channels, depending on the concentration of agonist in the extracellular solution. A value of 8 nM was obtained forK D , with a Hill coefficient of X=0.5. Non-specific antagonists of opioid receptors blocked the actions of morphine; these included ouabain at a concentration of 100 μM. An inhibitor, and activator, and a blocker of G-proteins had no effect on the effective charge. These data provide evidence that morphine decreases the voltage sensitivity of TTXr sodium channels.

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Authors and Affiliations

  1. Excitable Membrane Physiology Section, I. P. Pavlov Institute of Physiology, Russian Academy of Scences, 6 Makarov Embankment, 199034, St. Petersburg, Russia

    B. V. Krylov, S. A. Podzorova, M. I. Lyudyno & N. L. Izvarina

  2. Kuban State University, 149 Stavropolskaya, 350040, Krasnodar, Russia

    A. V. Derbenev

  3. Institute of Pharmacology, I. P. Pavlov Medical Academy, 6/8 L. Tolstoy Street, 197089, St. Petersburg, Russia

    A. V. Kuz'min

Authors
  1. B. V. Krylov
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  2. A. V. Derbenev
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  3. S. A. Podzorova
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  4. M. I. Lyudyno
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  5. A. V. Kuz'min
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  6. N. L. Izvarina
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Translated from Rossiiskii Fiziologicheskii Zhurnal imeni I. M. Sechenova, Vol. 85, No. 2, pp. 225–236, February, 1999.

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Krylov, B.V., Derbenev, A.V., Podzorova, S.A. et al. Morphine decreases the voltage sensitivity of slow sodium channels. Neurosci Behav Physiol 30, 431–439 (2000). https://doi.org/10.1007/BF02463098

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  • DOI: https://doi.org/10.1007/BF02463098

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