Vasoactive intestinal polypeptide-like substance: the potential transmitter for cerebral vasodilation.
In vitro pharmacological studies demonstrated that exogenously applied vasoactive intestinal polypeptide (VIP) relaxes the smooth muscle cells of cat cerebral arteries, whereas substance P constricts them. Ultrastructural-immunocytochemical techniques show that a VIP-like substance is present in the large granular vesicles of nonsympathetic nerve axons and terminals in the cerebral arterial walls. These results provide strong evidence in favor of the hypothesis that a VIP-like substance is the transmitter for vasodilation in cerebral blood vessels.
D000818:Animals; D002415:Cats; D002536:Cerebral Arteries / Q000187:drug effects; D002560:Cerebrovascular Circulation; D066298:In Vitro Techniques; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology / Q000502:physiology*; D014664:Vasodilation; D014666:Vasomotor System / Q000187:drug effects
D014660:Vasoactive Intestinal Peptide