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Effects of dopamine and noradrenaline on Ca channels of cultured sensory and sympathetic neurons of chick

  • Excitable Tissues and Central Nervous Physiology
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Abstract

The effects of noradrenaline and dopamine on voltage-dependent Ca currents were investigated in cultured dorsal root and sympathetic ganglion neurons from chick embryos. At concentrations of 1 to 10 μM, bath application of the neurotransmitters caused a general depression of inward Ca currents. Above −20 mV the decrease of the current amplitude was reversible and accompanied by a 2–10-fold prolongation of the activation time course. Below −20 mV, where a low voltage-activated Ca component is turned on, the size of the currents was reduced by 40% with little effect on the time course. Despite extensive wash-out, little sign of reversibility was observed in this case.

Single-channel current recording in outside-out membrane patches revealed that a low membrane potentials dopamine and noradrenaline reversibly reduced single Ca-channel activity. This finding supports the view that in sensory and sympathetic neurons, both neurotransmitters affect the membrane conductance by modulating Ca permeability and not by activating catecholamine-specific channels able to carry transient outward currents. The probability of Ca channel opening is strongly reduced by addition of 10 μM of either catecholamine to the bath. The possible involvement of a voltage-dependent block of Ca channels by the neurotransmitters is discussed.

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Author notes

  1. E. Carbone

    Present address: Istituto di Cibernetica e Biofisica del CNR, Corso Mazzini 20, I-16032, Camogli, Italy

  2. C. Marchetti

    Present address: Department of Physiology and Biophysics, University of Texas, Medical Branch, 77550-2781, Galveston, TX, USA

Authors and Affiliations

  1. Neurophysiologisches Institut, Max-Planck-Institut für Psychiatrie, D-8033, Planegg-Martinsried, Federal Republic of Germany

    C. Marchetti, E. Carbone & H. D. Lux

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  1. C. Marchetti
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  2. E. Carbone
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Marchetti, C., Carbone, E. & Lux, H.D. Effects of dopamine and noradrenaline on Ca channels of cultured sensory and sympathetic neurons of chick. Pflugers Arch. 406, 104–111 (1986). https://doi.org/10.1007/BF00586670

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