High-affinity dextromethorphan binding sites in guinea pig brain. I. Initial characterization.

Abstract:

:Tritiated dextromethorphan ([3H]DM) binds to two distinct sites in guinea pig brain, a high-affinity site (Kd = 13-20 nM) and a low-affinity site (Kd greater than 200 nM). Binding of [3H] DM to the high-affinity site is rapid, reversible, saturable, proportional to tissue concentration, and pH-dependent. The sites have a protein-like component, since preincubating brain homogenate in the presence of proteolytic enzymes and protein-modifying reagents significantly reduces binding. There is also a progressive loss of binding when brain homogenate is heated to temperatures in excess of 37 degrees. Millimolar concentrations of lithium, calcium, magnesium, and manganese decrease DM binding while sodium, in concentrations as high as 100 mM, has little effect; calcium in micromolar concentrations slightly enhances binding. The pons-medulla and cerebellum contain the highest density of sites. Subcellular localization studies have shown that high-affinity sites are confined almost exclusively to the microsomal fraction. Binding of DM to brain microsomes does not appear to be related to drug-metabolizing enzymes. The characteristics of DM binding suggest that DM sites are not a subclass of opiate receptors. Studies using tritiated dextrorphan as radioligand failed to reveal a high-affinity binding site for in brain.

journal_name

Mol Pharmacol

journal_title

Molecular pharmacology

authors

Craviso GL,Musacchio JM

subject

Has Abstract

pub_date

1983-05-01 00:00:00

pages

619-28

issue

3

eissn

0026-895X

issn

1521-0111

journal_volume

23

pub_type

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