Effect of covalent dimer conjugates of angiotensin II on receptor affinity and activity in vitro
| Autor: | Leoluca Criscione, S. Whitebread, R. H. Andreatta, Helene Thomann, Bruno Kamber, M. de Gasparo, Bernhard Riniker |
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| Rok vydání: | 1991 |
| Předmět: |
Pharmacology
Male Angiotensin receptor Receptors Angiotensin Stereochemistry Chemistry Dimer Angiotensin II Molecular Sequence Data Aorta Thoracic In Vitro Techniques In vitro Peptide Fragments chemistry.chemical_compound Biochemistry Covalent bond Potency Animals Amino Acid Sequence Rabbits Receptor Conjugate |
| Zdroj: | Journal of receptor research. 11(1-4) |
| ISSN: | 0197-5110 |
| Popis: | Angiotensin II [1-8 or 2-8] analogues and [4-8] fragments were dimerized through the amino- or carboxy-terminal groups in order to try to increase their potency as reported for other hormones. The binding affinity to the angiotensin II receptor subtypes A (A IIA) and B (A IIB) was tested and compared to the potency in rabbit aortic ring. The [2-8] dimers coupled through the N-terminus show no significant change in potency in aortic ring. The [4-8] fragments coupled through the N-terminus are inactive in the ring. They have however a significantly increased affinity for the A IIA receptor, the specific function of which has not yet been reported. When angiotensin II analogues or fragments are coupled through the C-terminus, there was a significant drop in affinity and potency, confirming the importance of the free carboxyl group in position 8 for binding and activity. It is concluded that binding to the A IIB receptor correlates well with the effectiveness in aortic ring. However, in contrast to the beneficial effect reported for a large number of other hormones, dimerization of angiotensin II or its fragments is not accompanied by an increased biological activity in aortic ring. |
| Databáze: | OpenAIRE |
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