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• W1978390724 endingPage "1609" @default.
• W1978390724 startingPage "1601" @default.
• W1978390724 abstract "Abstract The hypoglossal nucleus of young rats contains vasopressin binding sites and vasopressin can directly excite hypoglossal motoneurons. In addition, indirect evidence suggests that vasopressin can enhance the synaptic input to motoneurons. We have characterized this latter effect by using brainstem slices and whole‐cell recordings. We found that, in the presence of blockers of fast glutamatergic transmission, vasopressin strongly facilitated inhibitory synaptic activity. On average, vasopressin caused a six‐fold increase in the frequency and a 1.5‐fold increase in the amplitude of GABAergic postsynaptic currents. The effect of vasopressin on glycinergic postsynaptic currents was similar in magnitude. Vasopressin did not affect the frequency of GABAergic or glycinergic miniature postsynaptic currents, indicating that the peptide‐induced facilitation of inhibitory transmission was mediated by receptors located on the somatodendritic region rather than on axon terminals of presynaptic neurons. The pharmacological profile of these receptors was determined by using d[Cha4]AVP and dVDAVP, selective agonists of V1b and V2 vasopressin receptors, respectively, and Phaa‐D‐Tyr‐(Et)‐Phe‐Gln‐Pro‐Arg‐Arg‐NH2, a selective antagonist of V1a vasopressin receptors. The two agonists had no effect on the frequency of inhibitory postsynaptic currents. By contrast, the antagonist suppressed the vasopressin‐induced facilitation of these currents, indicating that the receptors involved were exclusively of the V1a type. Thus, vasopressin exerts a dual action on hypoglossal motoneurons: a direct excitatory action and an indirect action mediated by GABAergic and glycinergic synapses. By virtue of this dual effect, vasopressin could alter the input–output properties of these motoneurons. Alternatively, it could play a role in generating or modulating specific motor patterns." @default.
• W1978390724 created "2016-06-24" @default.
• W1978390724 creator A5069698831 @default.
• W1978390724 creator A5070723531 @default.
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• W1978390724 date "2005-03-01" @default.
• W1978390724 modified "2023-10-16" @default.
• W1978390724 title "Vasopressin facilitates glycinergic and GABAergic synaptic transmission in developing hypoglossal motoneurons" @default.
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• W1978390724 doi "https://doi.org/10.1111/j.1460-9568.2005.03996.x" @default.
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