[Effect of fenibut on the GABA B receptors of the spinal motor neurons].
It has been established in experiments on the isolated spinal cord of 7-14-day-old rats that the GABAB-mimetic phenibut (10(-5)--10(-4) M) elicits a slow-developing depolarization of motoneurons, suppression of spontaneous activity and polysynaptic reflex discharges of motoneurons, recorded from the ventral roots. Administered under the same conditions GABA produces de- and hyperpolarization of motoneurons. The depolarization of motoneurons elicited by phenibut and GABA is not reversed by picrotoxin in contradistinction to the GABA-induced hyperpolarization of motoneurons, being associated with a direct action of the GABA-mimetics on postsynaptic GABAB receptors of motoneurons. Diazepam (10(-9)--10(-6) M) potentiates the effects of phenibut supposedly via benzodiazepine receptors bound with GABAA receptors (an independent interaction).
Abramets
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Komissarov
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D000818:Animals; D003975:Diazepam / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D009046:Motor Neurons / Q000187:drug effects*; D018377:Neurotransmitter Agents / Q000494:pharmacology*; D051381:Rats; D011963:Receptors, GABA-A / Q000187:drug effects*; D017981:Receptors, Neurotransmitter / Q000187:drug effects; D013126:Spinal Nerve Roots / Q000187:drug effects*; D005680:gamma-Aminobutyric Acid / Q000031:analogs & derivatives* / Q000494:pharmacology
D018377:Neurotransmitter Agents; D011963:Receptors, GABA-A; D017981:Receptors, Neurotransmitter; D005680:gamma-Aminobutyric Acid; D003975:Diazepam; C008842:4-amino-3-phenylbutyric acid
Vliianie fenibuta na GAMK B-retseptory spinal'nykh motoneĭronov.