Autoradiographic evidence for two classes of mu opioid binding sites in rat brain using (/sup 125/I)FK33824

Journal Article · Sun Nov 01 00:00:00 EST 1987 · Peptides (Fayetteville, N.Y.); (United States)

DOI:https://doi.org/10.1016/0196-9781(87)90130-6· OSTI ID:5209890

Rothman, R B; Jacobson, A E; Rice, K C; Herkenham, M

Previous studies demonstrated that pretreatment of brain membranes with the irreversible mu antagonist, beta-funaltrexamine (beta-FNA), partially eliminated mu binding sites (25,35), consistent with the existence of two mu binding sites distinguished by beta-FNA. This paper tests the hypothesis that the FNA-sensitive and FNA-insensitive mu binding sites have different anatomical distributions in rat brain. Prior to autoradiographic visualization of mu binding sites, (/sup 3/H)oxymorphone, (/sup 3/H)D-ala2-MePhe4, Gly-ol5-enkephalin (DAGO), and (/sup 125/I)D-ala2-Me-Phe4-met(o)-ol)enkephalin (FK33824) were shown to selectively label mu binding sites using slide mounted sections of molded minced rat brain. As found using membranes, beta-FNA eliminated only a portion of mu binding sites. Autoradiographic visualization of mu binding sites using the mu-selective ligand (/sup 125/I)FK33824 in control and FNA-treated sections of rat brain demonstrated that the proportion of mu binding sites sensitive to beta-FNA varied across regions of the brain, particularly the dorsal thalamus, ventrobasal complex and the hypothalamus, providing anatomical data supporting the existence of two classes of mu binding sites in rat brain.

• Research Organization: NIMH, Washington, DC (USA)
• OSTI ID: 5209890
• Journal Information: Peptides (Fayetteville, N.Y.); (United States), Vol. 8:6
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ENDORPHINS
RECEPTORS
BIOLOGICAL LOCALIZATION
AUTORADIOGRAPHY
BRAIN
CELL MEMBRANES
IODINE 125
LIGANDS
RATS
TRITIUM COMPOUNDS
ANIMALS
AUTONOMIC NERVOUS SYSTEM AGENTS
BETA DECAY RADIOISOTOPES
BODY
CELL CONSTITUENTS
CENTRAL NERVOUS SYSTEM
DAYS LIVING RADIOISOTOPES
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
MAMMALS
MEMBRANE PROTEINS
MEMBRANES
NERVOUS SYSTEM
NEUROREGULATORS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PROTEINS
RADIOISOTOPES
RODENTS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques