Profiling two indole-2-carboxamides for allosteric modulation of the CB1 receptor.

Profiling two indole-2-carboxamides for allosteric modulation of the CB1 receptor.
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DOI:
10.1111/jnc.12115
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发表时间:
2013-03
影响因子:
4.7
通讯作者:
Kendall DA
Kendall DA
中科院分区:
医学2区
文献类型:
--
作者:
Ahn KH;Mahmoud MM;Samala S;Lu D;Kendall DA

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Allosteric modulation of G-protein coupled receptors (GPCRs) represents a novel approach for fine-tuning GPCR functions. The cannabinoid CB1 receptor, a GPCR associated with the CNS, has been implicated in the treatment of drug addiction, pain, and appetite disorders. We report here the synthesis and pharmacological characterization of two indole-2-carboxamides: 5-chloro-3-ethyl-1-methyl-N-(4-(piperidin-1-yl)phenethyl)-1H-indole-2-carboxamide (ICAM-a) and 5-chloro-3-pentyl-N-(4-(piperidin-1-yl)phenethyl)-1H-indole-2-carboxamide (ICAM-b). While both ICAM-a and ICAM-b enhanced CP55,940 binding, ICAM-b exhibited the strongest positive cooperativity thus far demonstrated for enhancing agonist binding to the CB1 receptor. Although it displayed negative modulatory effects on G-protein-coupling to CB1, ICAM-b induced β-arrestin-mediated downstream activation of ERK signaling. These results indicate that this compound represents a novel class of CB1 ligands that produce biased signaling via CB1.
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