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Electrically evoked release of vasopressin from isolated neurohypophyses in sodium-free media.

Electrical stimuli applied to the stalk of the neurohypophysis evoke release of posterior pituitary hormones (Douglas & Poisner, 1964) and this effect is dependent on impulse formation (Mikiten, 1967; Ishida, 1970). It is generally assumed that impulses act by depolarizing the neurosecretory terminals and setting in motion some calcium-dependent process since elevation of extracellular potassium also evokes secretion from these preparations and the response, like that to electrical stimulation (Mikiten & Douglas, 1965) requires calcium (Douglas & Poisner, 1964). We have now obtained further support for this assumption from experiments in which electrical stimulation of the endings has been demonstrated to be an effective stimulus for hormone release under conditions which preclude impulse formation and where the effect of the stimulus is therefore referable to a direct, presumably depolarizing, action on the terminals.