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Molecular Pharmacology

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Abstract

Intrinsic activity of enantiomers of 8-hydroxy-2-(di-n-propylamino)tetralin and its analogs at 5-hydroxytryptamine1A receptors that are negatively coupled to adenylate cyclase.

L J Cornfield, G Lambert, L E Arvidsson, C Mellin, J Vallgårda, U Hacksell and D L Nelson
Molecular Pharmacology June 1991, 39 (6) 780-787;
L J Cornfield
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G Lambert
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L E Arvidsson
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C Mellin
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J Vallgårda
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U Hacksell
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D L Nelson
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Abstract

Although many different types of compounds have been tested for 5-hydroxytryptamine1A (5-HT1A) binding affinity, much remains to be learned about the structural requirements associated with 5-HT1A agonism, partial agonism, and antagonism. The present study uses the forskolin-stimulated adenylate cyclase (FSC) assay as a functional screen in rat hippocampal membranes to examine structure-activity relationships for a series of enantiomers of novel analogs of the prototypic 5-HT1A agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT). The findings illustrate that there can be large enantiomeric differences in intrinsic activity at the 5-HT1A receptor, independent of enantiomeric effects on binding affinity. Generally, for each enantiomeric pair exhibiting stereoselective 5-HT1A binding, the enantiomer with the higher affinity also displayed the greater amount of 5-HT1A intrinsic activity in the FSC assay. Interestingly, the enantiomers of 8-OH-DPAT itself displayed stereoselective differences in intrinsic activity but not 5-HT1A affinity. Several of the compounds, namely (S)-UH-301, (2R,3R)-CM-12, and (1S,2R)-LEA-146, may have potential as prototypes for selective 5-HT1A antagonists, and (S)-UH-301 itself may be useful as a selective 5-HT1A antagonist. The FSC data presented here are in good agreement with reported measures of in vivo 5-HT1A activity, which were in part the basis of a recently proposed model for the 5-HT1A pharmacophore [J. Med. Chem. 34: 497-510 (1991)].

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Molecular Pharmacology
Vol. 39, Issue 6
1 Jun 1991
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Abstract

Intrinsic activity of enantiomers of 8-hydroxy-2-(di-n-propylamino)tetralin and its analogs at 5-hydroxytryptamine1A receptors that are negatively coupled to adenylate cyclase.

L J Cornfield, G Lambert, L E Arvidsson, C Mellin, J Vallgårda, U Hacksell and D L Nelson
Molecular Pharmacology June 1, 1991, 39 (6) 780-787;

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Abstract

Intrinsic activity of enantiomers of 8-hydroxy-2-(di-n-propylamino)tetralin and its analogs at 5-hydroxytryptamine1A receptors that are negatively coupled to adenylate cyclase.

L J Cornfield, G Lambert, L E Arvidsson, C Mellin, J Vallgårda, U Hacksell and D L Nelson
Molecular Pharmacology June 1, 1991, 39 (6) 780-787;
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