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Modulation of glycine receptor chloride channels by cAMP-dependent protein kinase in spinal trigeminal neurons

Nature volume 348, pages 242–245 (1990)Cite this article

Abstract

GLYCINE is an important inhibitory transmitter in the brainstem and spinal cord1,2. In the trigeminal subnucleus caudalis (medullary dorsal horn) and in the spinal dorsal horn (the relaying centres for processing pain and sensory information3–5), glycine inhibits the glutamate-evoked depolarization and depresses firing of neurons6. The binding of glycine to its receptor produces a large increase in Cl− conductance, which causes membrane hyper-polarization7. The selectivity and gating properties of glycine receptor channels have been well characterized8; the glycine receptor molecules have also been purified9–11. The amino-acid sequence, deduced from complementary DNA clones encoding one of the peptides (the 48K subunit)12, shows significant homology with γ-aminobutyric acid A (GABAA) and nicotinic acetylcholine receptor subunits, suggesting that glycine receptors may belong to a superfamily of chemically gated channel proteins12,13. However, very little is known about the modulation of glycine receptor channels. We have investigated the regulation of strychnine-sensitive glycine receptor channels by cyclic AMP-dependent protein kinase in neurons isolated from spinal trigeminal nucleus of rat and report here that the protein kinase A dramatically increased the glycine-induced Cl− currents by increasing the probability of the channel openings. GS protein, which is sensitive to cholera toxin, was involved in the modulation.

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  1. Marine Biomedical Institute and Department of Physiology and Biophysics, University of Texas Medical Branch, 200 University Blvd, Galveston, Texas, 77550, USA

    Yumin Song & Li-Yen Mae Huang

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  1. Yumin Song
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  2. Li-Yen Mae Huang
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Song, Y., Huang, LY. Modulation of glycine receptor chloride channels by cAMP-dependent protein kinase in spinal trigeminal neurons. Nature 348, 242–245 (1990). https://doi.org/10.1038/348242a0

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