Abstract：
:Glycine is an important inhibitory transmitter in the brainstem and spinal cord. In the trigeminal subnucleus caudalis (medullary dorsal horn) and in the spinal dorsal horn (the relaying centres for processing pain and sensory information), glycine inhibits the glutamate-evoked depolarization and depresses firing of neurons. The binding of glycine to its receptor produces a large increase in Cl- conductance, which causes membrane hyperpolarization. The selectivity and gating properties of glycine receptor channels have been well characterized; the glycine receptor molecules have also been purified. The amino-acid sequence, deduced from complementary DNA clones encoding one of the peptides (the 48K subunit), shows significant homology with gamma-aminobutyric acid A (GABAA) and nicotinic acetylcholine receptor subunits, suggesting that glycine receptors may belong to a superfamily of chemically gated channel proteins. 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.
journal_name
Naturejournal_title
Natureauthors
Song YM,Huang LYdoi
10.1038/348242a0subject
Has Abstractpub_date
1990-11-15 00:00:00pages
242-5issue
6298eissn
0028-0836issn
1476-4687journal_volume
348pub_type
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