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Receptors for angiotensin: a critical analysis
Canadian Journal of Physiology and Pharmacology
|February 1, 1979
Summary
This study analyzes angiotensin receptors, finding they are uniform in smooth muscles and the heart. It also questions the roles of angiotensin I and III in adrenal functions, proposing new research methods.
Area of Science:
- Pharmacology
- Endocrinology
- Physiology
Background:
- Angiotensin peptides exert diverse physiological effects via specific receptors.
- Classifying these receptors is crucial for understanding the renin-angiotensin system.
- Previous studies have proposed receptor subtypes based on pharmacological data.
Purpose of the Study:
- To re-evaluate and classify angiotensin receptors based on pharmacological evidence.
- To investigate the roles of angiotensin I and III in adrenal gland function.
- To propose improved methodologies for receptor characterization.
Main Methods:
- Analysis of published pharmacological data on angiotensin effects.
- Comparison of agonist potency and antagonist affinity across different tissues.
- Evaluation of receptor desensitization protocols.
Main Results:
- Angiotensin receptors in intestinal/vascular smooth muscle, heart, and vas deferens appear to be of a single type.
- Receptors mediating catecholamine release from the adrenal medulla and steroidogenesis in the adrenal cortex remain unidentified.
- Pharmacological evidence does not support angiotensin I's role in the adrenal medulla.
- The role of angiotensin III in the adrenal cortex requires re-evaluation due to methodological limitations.
Conclusions:
- A unified angiotensin receptor type exists in several peripheral tissues.
- The pharmacological classification of angiotensin receptors in the adrenal gland requires further investigation.
- Current methods for characterizing angiotensin receptors have limitations, necessitating the development of novel analogues for accurate assessment.