VIP receptors in mesenteric and coronary arteries: a radioligand binding study
| Autor: | Minta Huang, O.P. Rorstad |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Male
medicine.medical_specialty Physiology Swine Vasoactive intestinal peptide Cerebral arteries Peptide hormone In Vitro Techniques Apamin Biochemistry Binding Competitive Muscle Smooth Vascular Receptors Gastrointestinal Hormone Cellular and Molecular Neuroscience chemistry.chemical_compound Radioligand Assay Endocrinology Species Specificity medicine.artery Internal medicine medicine Radioligand Animals Humans Superior mesenteric artery Binding site Receptor business.industry Rats Inbred Strains Coronary Vessels Peptide Fragments Mesenteric Arteries Rats Kinetics chemistry Receptors Vasoactive Intestinal Peptide Cattle business Vasoactive Intestinal Peptide |
| Zdroj: | Peptides. 8(3) |
| ISSN: | 0196-9781 |
| Popis: | Using a biologically active radioligand, [Tyr(125I)10]VIP, we have identified and characterized receptors for vasoactive intestinal peptide (VIP) on membranes prepared from the rat superior mesenteric artery and bovine coronary arteries. Binding was specific, saturable, reversible and dependent on time and temperature. Scatchard analysis suggested the presence of a high and a low affinity binding site in each arterial system with the following binding constants: the rat mesenteric artery, KD = 0.22 +/- 0.02 and 13.6 +/- 7.8 nM (corresponding maximum number of binding sites, RO = 606 +/- 44 fmol/mg protein and 2.1 +/- 0.2 pmol/mg protein); bovine circumflex coronary artery, KD = 0.10 +/- 0.01 and 37.8 +/- 16.1 nM (corresponding RO = 369 +/- 65 fmol/mg protein and 2.0 +/- 0.7 pmol/mg protein); bovine left and right descending coronary arteries, KD = 0.12 +/- 0.03 and 21.3 +/- 6.4 nM (corresponding RO = 472 +/- 7 fmol/mg protein and 2.2 +/- 0.3 pmol/mg protein). The arterial VIP receptors did not recognize secretin, glucagon, apamin or bovine parathyroid hormone, and had reduced affinity for PHI, PHM and growth hormone releasing factors (GRF). These recognition properties were, by and large, similar to those seen in the bovine cerebral arteries although a between-species heterogeneity of recognition function could be deduced from the differences in the competitive binding of rat and bovine vascular VIP receptors with the corresponding species-specific GRFs. |
| Databáze: | OpenAIRE |
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