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GTP-binding proteins mediate transmitter inhibition of voltage-dependent calcium channels

Nature volume 319, pages 670–672 (1986)Cite this article

Abstract

The modulation of voltage-dependent calcium channels by hormones and neurotransmitters has important implications for the control of many Ca2+-dependent cellular functions including exocytosis and contractility1–7. We made use of electrophysiological techniques, including whole-cell patch-clamp recordings from dorsal root ganglion (DRG) neurones, to demonstrate a role for GTP-binding proteins (G-proteins) as signal transducers in the noradrenaline- and γ-aminobutyric acid (GABA)-induced inhibition of voltage-dependent calcium channels8–11. This action of the transmitters was blocked by: (1) preincubation of the cells with pertussis toxin (a bacterial exotoxin catalysing ADP-ribosylation of G-proteins12); or (2) intracellular administration of guanosine 5′-O-(2-thiodiphosphate) (GDP-β-S), a non-hydrolysable analogue of GDP that competitively inhibits the binding of GTP to G-proteins13. Our findings provide the first direct demonstration of the G-protein-mediated inhibition of voltage-dependent calcium channels by neurotransmitters. This mode of transmitter action may explain the ability of noradrenaline and GABA to presynaptically inhibit Ca2+-dependent neurosecretion from DRG sensory neurones4,5.

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Authors and Affiliations

  1. Department of Physiology, Tufts University School of Medicine, Boston, Massachusetts, 02111, USA

    George G. Holz IV, Stanley G. Rane & Kathleen Dunlap

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  1. George G. Holz IV
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  2. Stanley G. Rane
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  3. Kathleen Dunlap
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Holz, G., Rane, S. & Dunlap, K. GTP-binding proteins mediate transmitter inhibition of voltage-dependent calcium channels. Nature 319, 670–672 (1986). https://doi.org/10.1038/319670a0

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