Local actions of angiotensin II: quantitative in vitro autoradiographic localization of angiotensin II receptor binding and angiotensin converting enzyme in target tissues

Journal Article · Wed Jan 01 00:00:00 EST 1986 · J. Cardiovasc. Pharmacol.; (United States)

DOI:https://doi.org/10.1097/00005344-198600101-00008· OSTI ID:6332355

Chai, S Y; Allen, A M; Adam, W R; Mendelsohn, F A

In order to gain insight into the local actions of angiotensin II (ANG II) we have determined the distribution of a component of the effector system for the peptide, the ANG II receptor, and that of an enzyme-catalysing ANG II formation, angiotensin converting enzyme (ACE), by in vitro autoradiography in several target tissues. The superagonist ANG II analog, /sup 125/I(Sar1)ANG II, or the antagonist analog, /sup 125/I(Sar1,Ile8)ANG II, were used as specific radioligands for ANG II receptors. A derivative of the specific ACE inhibitor, lysinopril, called /sup 125/I-351A, was used to label ACE in tissues. In the adrenal, a high density of ANG II receptors occurs in the glomerulosa zone of the cortex and in the medulla. ACE is also localized in these two zones, indicating that local production of ANG II may occur close to its sites of action in the zona glomerulosa and adrenal medulla. In the kidney, a high density of ANG II receptors is associated with glomeruli in the cortex and also with vasa recta bundles in the inner stripe of the outer medulla. ACE is found in very high concentration in deep proximal convoluted tubules of the cortex, while much lower concentrations of the enzyme occur in the vascular endothelium throughout the kidney. In the central nervous system three classes of relationships between ANG II receptors and ACE are observed: In the circumventricular organs, including the subfornical organ and organum vasculosum of the lamina terminalis, a high concentration of both components occurs. Since these structures have a deficient blood-brain barrier, local conversion of circulating angiotensin I (ANG I) to ANG II may contribute to the action of ANG II at these sites.

• Research Organization: Univ. Department of Medicine, Heidelberg, Australia
• OSTI ID: 6332355
• Journal Information: J. Cardiovasc. Pharmacol.; (United States), Journal Name: J. Cardiovasc. Pharmacol.; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ANGIOTENSIN
RECEPTORS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL LOCALIZATION
ADRENAL GLANDS
AUTORADIOGRAPHY
BLOOD-BRAIN BARRIER
BRAIN
CENTRAL NERVOUS SYSTEM
ENZYMES
IN VITRO
IODINE 125
KIDNEYS
RATS
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
CARDIOVASCULAR AGENTS
DAYS LIVING RADIOISOTOPES
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE GLANDS
GLANDS
GLOBULINS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
KINETICS
MAMMALS
MEMBRANE PROTEINS
NERVOUS SYSTEM
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PROTEINS
RADIOISOTOPES
REACTION KINETICS
RODENTS
VASOCONSTRICTORS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques