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Brain Res. 1985 Sep 9;342(2):361-5.

Electrophysiological evidence that circulating angiotensin II sensitive neurons in the subfornical organ alter the activity of hypothalamic paraventricular neurohypophyseal neurons in the rat.


Thirteen neurons in the subfornical organ (SFO) were antidromically activated by electrical stimulation of the paraventricular nucleus (PVN) in the rat. The activity of these identified SFO neurons was excited by intravenous injection of angiotensin II (AII). Electrical stimulation of the SFO produced orthodromic excitation (40%) and inhibition (40%) of the activity of putative vasopressin (VP)-secreting PVN neurons. These results suggest that circulating AII sensitive SFO neurons with efferent projections to the PVN have both excitatory and inhibitory influences on the activity of putative VP-secreting neurons in the PVN.

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