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 Pharmacoljournal_title
Molecular pharmacologyauthors
Craviso GL,Musacchio JMsubject
Has Abstractpub_date
1983-05-01 00:00:00pages
619-28issue
3eissn
0026-895Xissn
1521-0111journal_volume
23pub_type
杂志文章abstract::The neuropeptides vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating peptide (PACAP) and their class II G protein-coupled receptors VPAC(1), VPAC(2), and PAC(1) play important roles in human physiology. No small molecule modulator has ever been reported for the VIP/PACAP receptors, and ther...
journal_title:Molecular pharmacology
pub_type: 杂志文章
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journal_title:Molecular pharmacology
pub_type: 杂志文章
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journal_title:Molecular pharmacology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Molecular pharmacology
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-09-01 00:00:00
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更新日期:2009-01-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-11-01 00:00:00
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journal_title:Molecular pharmacology
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journal_title:Molecular pharmacology
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更新日期:1994-03-01 00:00:00
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journal_title:Molecular pharmacology
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pub_type: 杂志文章
doi:
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pub_type: 杂志文章
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更新日期:1985-01-01 00:00:00