The fate of radioiodinated endothelin-1 and endothelin-3 in the rat

Journal Article · Sun Jan 01 04:00:00 EST 1989 · J. Cardiovasc. Pharmacol.; (United States)

DOI:https://doi.org/10.1097/00005344-198900135-00012· OSTI ID:5822294

Anggard, E G; Galton, S; Rae, G; Thomas, R; McLoughlin, L; de Nucci, G; Vane, J R

Endothelin-1 (ET-1) has been isolated from cultured endothelial cells and might have a role in cardiovascular regulation. To study the fate of labeled ET-1, we prepared (/sup 125/I)-labeled ET-1 (formerly porcine and human ET) and ET-3 (formerly rat ET). Approximately 0.2 microCi (0.2 pmol) was injected into the left ventricle of anesthetized rats and blood samples analyzed for radioactivity for up to 40 min. The animals were then killed and the distribution of radioactivity determined in various organs. Both ET-1 and ET-3 were rapidly removed from the circulation, with more than 60% of the removal occurring in the first minute. Removal of ET-1 was somewhat faster than that of ET-3. The highest uptake of radioactivity was seen in lung, kidney, and liver. When ET-1 was infused into the isolated perfused lung of the guinea pig, 64 +/- 1.9% of the label was retained. Subcellular fractionation of the lung homogenate following infusion of labeled ET-1 showed that 93% of the label was associated with membranes and intracellular organelles, suggesting internalization of the bound ET-1. Together, the results indicate a high density of ET-1 binding sites in the lung, liver, and kidney and that these organs may be important in removing circulating ET-1.

• Research Organization: St. Bartholomew's Hospital Medical College, London (England)
• OSTI ID: 5822294
• Journal Information: J. Cardiovasc. Pharmacol.; (United States), Journal Name: J. Cardiovasc. Pharmacol.; (United States) Vol. 13 Suppl 5; ISSN JCPCD
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
CARDIOVASCULAR AGENTS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
GUINEA PIGS
IN VITRO
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LUNGS
MAMMALS
MEMBRANE PROTEINS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDES
PERFUSED ORGANS
PROTEINS
RADIOISOTOPES
RATS
RECEPTORS
RESPIRATORY SYSTEM
RODENTS
SUBCELLULAR DISTRIBUTION
TISSUE DISTRIBUTION
TRACER TECHNIQUES
VASODILATORS
VERTEBRATES