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• W2046450188 abstract "Helospectin I and II and helodermin are nonamidated, vasoactive intestinal peptide (VIP)-like peptides, isolated from the salivary gland venom of the lizards Heloderma suspectum and Heloderma horridum. Helospectin I has 38 amino acid residues and differs from helospectin II in that it has an additional serine residue at the C-terminus. Numerous nerve fibers containing helospectin-like immunoreactivity (LI) and a few fibers containing helodermin-LI were present in the adventitia and at the adventitia-media border of cat cerebral arteries. In the sphenopalatine ganglion, numerous nerve cell bodies containing helospectin-LI were seen. Double immunostaining revealed that helospectin-LI nerve cell bodies coexisted with VIP-containing cell bodies. Radioimmunoassay showed high levels of helospectin-LI in extracts of cerebral vessels from the circle of Willis (27.4 pg/mg [wt/wt]). Helospectin I and II and helodermin (10 −10 to 10 −6 mol/L) produced concentration-dependent relaxations of feline middle cerebral arteries amounting to 50% to 80% of precontraction induced by U46619. The maximum effects and the potency were similar to that of VIP. Neither of these peptides elicited endothelium-dependent relaxations. Intracerebral microinjection of helospectin and helodermin produced a moderate concentration-dependent increase of the cerebral blood flow of α-chloralose anesthetized cats. The maximum increase (21 ± 5%) was observed after the injection of 5 μg helodermin, whereas 16 ± 7% was seen with helospectin I and 19 ± 5% with helospectin II. The results suggest that helospectin/helodermin-like peptides co-localize with VIP in perivascular nerve fibers originating in the sphenopalatine ganglion. They seem to have strong and potent vasodilator effects." @default.
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• W2046450188 date "1999-01-01" @default.
• W2046450188 modified "2023-10-15" @default.
• W2046450188 title "Helospectin-Like Peptides: Immunochemical Localization and Effects on Isolated Cerebral Arteries and on Local Cerebral Blood Flow in the Cat" @default.
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• W2046450188 doi "https://doi.org/10.1097/00004647-199901000-00007" @default.
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