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Molecular Pharmacology

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Abstract

(R)-(-)-[77Br]4-bromo-2,5-dimethoxyamphetamine labels a novel 5-hydroxytryptamine binding site in brain membranes.

S J Peroutka, A Hamik, M A Harrington, A J Hoffman, C A Mathis, P A Pierce and S S Wang
Molecular Pharmacology October 1988, 34 (4) 537-542;
S J Peroutka
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A Hamik
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M A Harrington
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A J Hoffman
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C A Mathis
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P A Pierce
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S S Wang
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Abstract

(R)-(-)-[77Br]4-Bromo-2,5-dimethoxyamphetamine [(R)-(-)-[77Br] DOB] was synthesized to a high specific activity (1875 +/- 50 Ci/mmol) and used to label membrane-associated recognition sites in rat brain. (R)-(-)-[77Br]DOB displayed high affinity (KD = 0.60 +/- 0.08 nM) for a relatively low density of binding sites (Bmax = 1.2 +/- 0.08 pmol/g of tissue) in rat cortical membranes as compared with [3H]ketanserin (KD = 0.65 +/- 0.1 nM; Bmax = 6.2 +/- 0.6 pmol/g of tissue). Guanine, but not adenine, nucleotides were found to inhibit specific (R)-(-)-[77Br]DOB binding. GTP (10(-4) M) did not eliminate specific (R)-(-)-[77Br]DOB binding but caused a competitive inhibition of the radioligand. Drug competition studies of 5-hydroxytryptamine (5-HT) and related agents indicate that both putative agonists and antagonists display nanomolar potency for these sites. A significant correlation (p less than 0.01) exists between drug potencies for (R)-(-)-[77Br]DOB-labeled sites and both 5-HT2 (r = 0.64) and 5-HT1C (r = 0.68) binding sites. However, the sites do not appear to be identical. Moreover, a significant correlation exists between drug potencies for (R)-(-)-[77Br]DOB-labeled sites and human hallucinogenic drug potencies (r = 0.89; p less than 0.01). We conclude that (R)-(-)-[77Br]DOB labels a unique 5-HT recognition site in rat brain that does not coincide with previously described 5-HT binding site subtypes. The (R)-(-)-[77Br]DOB site does not appear to be a high affinity "state" of the 5-HT2 receptor but may label a subset of heterogeneous 5-HT2 recognition sites.

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Molecular Pharmacology
Vol. 34, Issue 4
1 Oct 1988
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Abstract

(R)-(-)-[77Br]4-bromo-2,5-dimethoxyamphetamine labels a novel 5-hydroxytryptamine binding site in brain membranes.

S J Peroutka, A Hamik, M A Harrington, A J Hoffman, C A Mathis, P A Pierce and S S Wang
Molecular Pharmacology October 1, 1988, 34 (4) 537-542;

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Abstract

(R)-(-)-[77Br]4-bromo-2,5-dimethoxyamphetamine labels a novel 5-hydroxytryptamine binding site in brain membranes.

S J Peroutka, A Hamik, M A Harrington, A J Hoffman, C A Mathis, P A Pierce and S S Wang
Molecular Pharmacology October 1, 1988, 34 (4) 537-542;
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