Podda, M. V. and Deriu, Franca and Montella, Andrea Costantino Mario and Satta, Andrea Ercole and Tolu, Eusebio (1998) Responses of vestibular neurons to arginine vasopressin microinjection. Pflügers Archiv. European Journal of Physiology, Vol. 436 (6), p. 914-919. eISSN 1432-2013. Article.
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The aim of the present research was to evaluate the effects induced by arginine vasopressin (VP) microinjection on the electrical activity of single vestibular neurons. Experiments were performed on anaesthetized guinea-pigs in which the spontaneous and the evoked electrical activity of vestibular neurons were recorded before and after intranuclear VP microinjection (0.25·10–5 pg VP in 0.25 µl NaCl 0.9% solution). Results showed that VP microinjection affects the spontaneous as well as the evoked vestibular neuron activity. More precisely, 60% of 30 tested neurons were inhibited, 30% were excited and the remaining 10% were unaffected by VP microinjection. The changes in neuronal activity reported above were attributed to a direct action exerted by the polypeptide on vestibular complex neurons. The possible role played by VP in the mechanisms of postural control exerted by the vestibular system was considered as well.
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