Spontaneous ‘Phasic-Firing’ in Supraoptic Neurons Recorded from Hypothalamo-Neurohypophysial Explants in vitro
- 1 January 1982
- journal article
- research article
- Published by S. Karger AG in Neuroendocrinology
- Vol. 34 (6), 405-409
- https://doi.org/10.1159/000123336
Abstract
Single unit, extracellular electrical activity of 97 hpothalamic supraoptic neurons was recorded with micropipettes from rat hypothalamo-neurohypophyseal explants maintained acutely in vitro. Spontaneously firing and quiescent neurons were encountered in roughly equal numbers. Of the spontaneously active neurons, 36.3% fired in a phasic mode quantitatively similar to that of vasopressin-secreting neurons recorded in vivo under conditions of enhanced hormone release. A small portion (.apprx. 14%) of the recorded supraoptic neurons had spikes which showed constant latency and high frequency following responses to stimulation of the neural stalk, responses characteristic of antidromically stimulated neurons. The mean latency and the range of latencies to these responses were similar to that recorded in vivo. Hypothalamo-neurohypophyseal explants maintained in vitro thus provide a useful tool for investigating the electrical activity of supraoptic neurosecretory cells. Since the explant contains both the supraoptic neurons and their neurohypophyseal projection path, this preparation offers an opportunity for characterizing further the relationship between electrical activity and hormone release.This publication has 18 references indexed in Scilit:
- Phasic discharge in supraoptic neurones recorded from hypothalamic slicesExperimental Brain Research, 1978
- Spontaneous and osmotically-stimulated activity in slices of rat hypothalamusBrain Research Bulletin, 1978
- Neurones with synchronous bursting discharges in organ cultures of the hypothalamic supraoptic nucleus areaBrain Research, 1978
- Comparison of firing patterns in oxytocin- and vasopressin-releasing neurones during progressive dehydrationBrain Research, 1978
- Osmotic Control of Vasopressin Release by Rat Hypothalamo-Neurohypophyseal Explants in Organ CultureEndocrinology, 1977
- Characterization of the responses of oxytocin‐ and vasopressin‐secreting neurones in the supraoptic nucleus to osmotic stimulationThe Journal of Physiology, 1977
- Cholinergic Stimulation of Vasopressin Release from the Rat Hypothalamo-Neurohypophyseal System in Organ CultureEndocrinology, 1977
- Electrophysiological differentiation of oxytocin-and vasopressin-secreting neuronesProceedings of the Royal Society of London. B. Biological Sciences, 1977
- Technical considerations on the use of horseradish peroxidase as a neuronal markerNeuroscience, 1977
- Excitation of phasically firing hypothalamic supraoptic neurones by carotid occlusion in rats.The Journal of Physiology, 1976