Evidence for a neuromodulatory role of GABA at the first synapse of the baroreceptor reflex pathway. Effects of GABA derivatives injected into the NTS.

Article date: 1982/5/1

PubMed ID: 638851

Journal name: Naunyn-Schmiedeberg's archives of pharmacology (ISSN: 0028-1298)


Microinjections of GABA and of the specific agonist of GABA receptors, muscimol, in the intermediate nucleus tractus solitarii (NTS) of pentobarbitone anaesthetized cats produced hypertension and tachycardia. The GABA receptor antagonist, bicuculline, had opposite effects and prevented those of muscimol. Therefore, a GABAergic system appears to modulate the cardiovascular regulation within the NTS. d,l-Baclofen also increased blood pressure and heart rate when injected into the same region, but this effect was not antagonized by bicuculline. The mechanism of this action of baclofen is discussed.

Author List: Bousquet P, Feldman J, Bloch R, Schwartz J

Publication Types: Journal Article

Substances mentioned in the article: Receptors, Cell Surface; Receptors, GABA-A; Muscimol; gamma-Aminobutyric Acid; Baclofen; Bicuculline;

Mesh terms: Animals; Baclofen/pharmacology; Bicuculline/pharmacology; Blood Pressure/drug effects; Cats; Female; Heart Rate/drug effects; Male; Medulla Oblongata/drug effects; Muscimol/pharmacology; Pressoreceptors/drug effects; Receptors, Cell Surface/physiology; Receptors, GABA-A; Reflex/drug effects; gamma-Aminobutyric Acid/pharmacology;

Citations: - 793669

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