We have previously shown the existence of a novel peripheral reflex inhibitorily modulating the vas deferens sympathetic activity. An interaction between noradrenergic and histamine-containing neurons is involved in this reflex. As an overall mechanism of sympathetic autoregulation, we found that enhanced sympathetic activity in the rat during the stress induced by brief inescapable footshocks caused a marked rise of blood histamine that was seemingly dependent upon sympathetic activity. This rise was prevented by either previous ganglionic blockade with hexamethonium or chronic guanethidine-induced sympathectomy. Previous adrenal demedullation did not impair this rise. Thus, it appears that only the sympathetic postganglionic neuron, interacting with a histamine-containing neuron, is involved in the rise of blood histamine induced by footshocks.
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