Abstract
The action of oxytocin (0.01–1 μM) on sympathetic preganglionic neurones was studied by intracellular recording in slices of neonatal rat thoracic spinal cord. In 85% of the cells superfusion induced a slow tetrodotoxin-insensitive depolarization accompanied by the appearance or increase in frequency of repetitive discharges. Oxytocin also caused some cells to switch from silent neurones to spontaneously active ones. These effects were reversibly blocked by a specific oxytocin antagonist.
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