In vivo binding in rat brain and radiopharmaceutical preparation of radioiodinated HEAT, an alpha-1 adrenoceptor ligand

Journal Article · Tue Mar 01 00:00:00 EST 1988 · J. Nucl. Med.; (United States)

OSTI ID:5294730

Couch, M W; Greer, D M; Thonoor, C M; Williams, C M

In vivo binding of (/sup 125/I)-2-(beta-(3-iodo-4-hydroxyphenyl)ethylaminomethyl tetralone) ((/sup 125/I)HEAT) to alpha-1 adrenoceptors in the rat brain was determined over 4 hr. Uptake in the thalamus and frontal cortex was approximately 0.1% injected dose per gram tissue. Thalamus/cerebellum ratios of 10:1 and frontal cortex/cerebellum ratios of 5:1 were found at 4 hr. Pretreatment with prazosin, an alpha-1 antagonist, completely inhibited the accumulation of (/sup 125/I)HEAT in thalamus and frontal cortex; yet uptake of radioactivity was not significantly affected by antagonists and agonists for other receptors classes (propranolol, beta-1; apomorphine, D-1; spiperone, D-2). Binding of (/sup 125/I)HEAT is saturable. At 4 hr, (/sup 125/I)HEAT or (/sup 123/I)HEAT was shown to be the only radioactive material in rat thalamus and frontal cortex. Iodine-123 HEAT and (/sup 125/I)HEAT were synthesized as radiopharmaceuticals within 3 hr in 99% radiochemical purity.

• Research Organization: Veterans Administration Medical Center, Gainesville, FL (USA)
• OSTI ID: 5294730
• Journal Information: J. Nucl. Med.; (United States), Vol. 29:3
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
RADIOPHARMACEUTICALS
BIOCHEMICAL REACTION KINETICS
CHEMICAL PREPARATION
BRAIN
IN VIVO
IODINE 123
IODINE 125
LIGANDS
RATS
RECEPTORS
TRACER TECHNIQUES
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
CENTRAL NERVOUS SYSTEM
DAYS LIVING RADIOISOTOPES
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LABELLED COMPOUNDS
MAMMALS
MEMBRANE PROTEINS
NERVOUS SYSTEM
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PROTEINS
RADIOISOTOPES
REACTION KINETICS
RODENTS
SYNTHESIS
VERTEBRATES
550601* - Medicine- Unsealed Radionuclides in Diagnostics