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- W5929030 abstract "The functional significance of GABA (gamma-aminobutyric acid) action in the control of the milk ejection has been investigated in anaesthetized lactating rats. Intracerebroventricular injections of either muscimol, a GABA-A receptor agonist, or bicuculline, an antagonist, resulted in a dose-dependent inhibition of the milk ejection reflex and delayed the occurence of the neurosecretory bursts of oxytocin neurones. Microinfusions of muscimol and bicuculline directly into both magnocellular supraoptic nuclei also evoked an inhibition of the milk ejection reflex. Extracellular supraoptic GABA concentrations measured using the technique of intracranial microdialysis were not altered in response to suckling or at the time of reflex milk ejections. Together, these observations suggest that a steady on-going balance of GABA activity at GABA-A receptors is essential for the normal function of the oxytocin pulse generator during lactation. L'existence de mecanismes de controle du reflexe d'ejection de lait dependant du GABA (acide gamma-aminobutyrique) a ete mise en evidence chez la rate anesthesiee. L'injection intracerebroventriculaire d'un agoniste des recepteurs GABA-A, le muscimol, ou d'un antagoniste, la bicuculline, inhibe de facon dose dependante le reflexe d'ejection de lait, et augmente l'intervalle de temps entre bouffees de potentiels d'action neurosecretrices. L'infusion bilaterale directe dans les noyaux supraoptiques de muscimol comme de bicuculline provoque egalement une inhibition du reflexe. Les experiences de microdialyse montrent que la tetee n'induit pas de variations des concentrations extracellulaires de GABA dans le noyau supraoptique, suscrptibles d'induire seules les bouffees de potentiels d'action neurosecretrices. L'ensemble de ces donnees conforte l'hypothese d'un role permissif determinant du GABA dans le maintien de l'integrite fonctionnelle des mecanismes qui permettent la pulsatilite de la liberation d'ocytocine au cours de la tetee chez la rate." @default.
- W5929030 created "2016-06-24" @default.
- W5929030 creator A5074139503 @default.
- W5929030 date "1994-01-01" @default.
- W5929030 modified "2023-09-27" @default.
- W5929030 title "Role de l'acide gamma-aminobutyrique dans le controle de la pulsatilité de la libération d'ocytocine au cours de l'allaitement chez la rate" @default.
- W5929030 hasPublicationYear "1994" @default.
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