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Species-specific in Vitro Pharmacological Effects of the Cannabinoid Receptor 2 (CB2) Selective Ligand AM1241 and Its Resolved Enantiomers

Species-specific in Vitro Pharmacological Effects of the Cannabinoid Receptor 2 (CB2) Selective Ligand AM1241 and Its Resolved Enantiomers

B Bingham, P G Jones, A J Uveges, S Kotnis, P Lu, V A Smith, S-C Sun, L Resnick, M Chlenov, Y He, B W Strassle, T A Cummons, M J Piesla, J E Harrison, G T Whiteside, J D Kennedy

Br J Pharmacol. 2007 Aug;151(7):1061-70.

PMID: 17549048

Abstract:

Background and purpose:
Racemic (R,S) AM1241 is a cannabinoid receptor 2 (CB(2))-selective aminoalkylindole with antinociceptive efficacy in animal pain models. The purpose of our studies was to provide a characterization of R,S-AM1241 and its resolved enantiomers in vitro and in vivo.
Experimental approach:
Competition binding assays were performed using membranes from cell lines expressing recombinant human, rat, and mouse CB(2) receptors. Inhibition of cAMP was assayed using intact CB(2)-expressing cells. A mouse model of visceral pain (para-phenylquinone, PPQ) and a rat model of acute inflammatory pain (carrageenan) were employed to characterize the compounds in vivo.
Key results:
In cAMP inhibition assays, R,S-AM1241 was found to be an agonist at human CB(2), but an inverse agonist at rat and mouse CB(2) receptors. R-AM1241 bound with more than 40-fold higher affinity than S-AM1241, to all three CB(2) receptors and displayed a functional profile similar to that of the racemate. In contrast, S-AM1241 was an agonist at all three CB(2) receptors. In pain models, S-AM1241 was more efficacious than either R-AM1241 or the racemate. Antagonist blockade demonstrated that the in vivo effects of S-AM1241 were mediated by CB(2) receptors.
Conclusions and implications:
These findings constitute the first in vitro functional assessment of R,S-AM1241 at rodent CB(2) receptors and the first characterization of the AM1241 enantiomers in recombinant cell systems and in vivo. The greater antinociceptive efficacy of S-AM1241, the functional CB(2) agonist enantiomer of AM1241, is consistent with previous observations that CB(2) agonists are effective in relief of pain.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP444912485	(R,S)-AM1241		444912-48-5	Price

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