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- W2077886050 abstract "The potent vasodilator peptide, adrenomedullin, has been shown to be present in plasma, suggesting a physiological role in cardiovascular control. Here we investigated the hypotensive action of adrenomedullin in vivo, using the anaesthetised rat as the bioassay model, and adrenomedullin binding sites using ligand binding assays on rat blood vessel membranes. Rat αCGRP and both human and rat adrenomedullins induced dose-dependent, powerful and long-lasting hypotensive effects. At peptide doses used in this study (0.02–2 nmol/kg), the efficacy of both human and rat adrenomedullins was lower than that of rat αCGRP. The CGRP1-receptor antagonist, human CGRP(8–37) (200 nmol/kg) was able to completely inhibit the hypotensive effect of rat αCGRP (0.2 nmol/kg) but not that of rat adrenomedullin (2 nmol/kg), implying that the adrenomedullin action is independent of CGRP1-receptors. Ligand binding assays confirmed the presence of both CGRP and adrenomedullin binding sites in rat blood vessels. The 125I-rat adrenomedullin binding site has a Kd = 0.32 ± 0.12 nM (n = 4) for rat adrenomedullin but has a Ki > 10−6M for rat αCGRP. Chemical cross-linking and SDS-PAGE analysis revealed theadrenomedullin binding protein to have a Mr of 83 000 with a minor band of Mr = 99 000. The results suggest that the hypotensive effect of adrenomedullin may be mediated via specific adrenomedullin binding sites, in vivo." @default.
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- W2077886050 date "1996-04-01" @default.
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- W2077886050 title "Specific adrenomedullin binding sites and hypotension in the rat systemic vascular bed" @default.
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- W2077886050 doi "https://doi.org/10.1016/0167-0115(96)00017-1" @default.
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