Vascular effects of helodermin, helospectin I and helospectin II: a comparison with vasoactive intestinal peptide (VIP)
1990; Wiley; Volume: 99; Issue: 3 Linguagem: Inglês
10.1111/j.1476-5381.1990.tb12962.x
ISSN1476-5381
AutoresLars Grundemar, Edward D. Högestätt,
Tópico(s)Ion Channels and Receptors
ResumoHelodermin, helospectin I and helospectin II, peptides recently isolated from the salivary gland venom of Heloderma suspectum , were compared to vasoactive intestinal peptide (VIP) with respect to effects on systemic blood pressure and on isolated femoral arteries in the rat. They all reduced blood pressure in a dose‐dependent manner; helodermin was less effective than VIP. However, at doses higher than 1 nmol kg −1 all four peptides reduced blood pressure to about the same extent. The half‐life of the hypotensive effect of VIP was longer than that of helodermin and the helospectins. VIP and helodermin were equally potent in relaxing femoral arteries precontracted with phenylephrine or prostaglandin F 2α. Helospectin I and II relaxed phenylephrine‐contracted vessels to the same extent as VIP but with a lower potency. Addition of VIP 1 μ m to preparations exposed to helodermin 1 μ m or to either of the helospectins did not produce a further relaxation. The findings indicate that VIP, helodermin and helospectin I and II have a similar profile of action and therefore may act on a common receptor.
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