Battle of Backbone Mountain

AM-251 is an inverse agonist at the CB₁ cannabinoid receptor. AM-251 is structurally very close to rimonabant; both are biarylpyrazole cannabinoid receptor antagonists. In AM-251, the p-chloro group attached to the phenyl substituent at C-5 of the pyrazole ring is replaced with a p-iodo group. The resulting compound exhibits slightly better binding affinity for the CB₁ receptor (with a K_i value of 7.5 nM) than rimonabant, which has a K_i value of 11.5 nM, AM-251 is, however, about two-fold more selective for the CB₁ receptor when compared to rimonabant.^[1] Like rimonabant, it is additionally a μ-opioid receptor antagonist^[2] that attenuates analgesic effects.^[3]

AM251 has shown an in vitro antimelanoma activity against pancreatic and colon cancer cells.^[4]

References

^ Lan R, Liu Q, Fan P, Lin S, Fernando SR, McCallion D, et al. (February 1999). "Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists". Journal of Medicinal Chemistry. 42 (4): 769–776. doi:10.1021/jm980363y. PMID 10052983.
^ Seely KA, Brents LK, Franks LN, Rajasekaran M, Zimmerman SM, Fantegrossi WE, Prather PL (October 2012). "AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies". Neuropharmacology. 63 (5): 905–915. doi:10.1016/j.neuropharm.2012.06.046. PMC 3408547. PMID 22771770.
^ Seely KA, Brents LK, Franks LN, Rajasekaran M, Zimmerman SM, Fantegrossi WE, Prather PL (October 2012). "AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies". Neuropharmacology. 63 (5): 905–915. doi:10.1016/j.neuropharm.2012.06.046. PMC 3408547. PMID 22771770.
^ Carpi S, Fogli S, Romanini A, Pellegrino M, Adinolfi B, Podestà A, et al. (August 2015). "AM251 induces apoptosis and G2/M cell cycle arrest in A375 human melanoma cells" (PDF). Anti-Cancer Drugs. 26 (7): 754–762. doi:10.1097/CAD.0000000000000246. hdl:11568/750318. PMID 25974027. S2CID 205526223. Archived (PDF) from the original on July 2, 2021.

[1] Lan R, Liu Q, Fan P, Lin S, Fernando SR, McCallion D, et al. (February 1999). "Structure-activity relationships of pyrazole derivatives as cannabinoid receptor antagonists". Journal of Medicinal Chemistry. 42 (4): 769–776. doi:10.1021/jm980363y. PMID 10052983.

[2] Seely KA, Brents LK, Franks LN, Rajasekaran M, Zimmerman SM, Fantegrossi WE, Prather PL (October 2012). "AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies". Neuropharmacology. 63 (5): 905–915. doi:10.1016/j.neuropharm.2012.06.046. PMC 3408547. PMID 22771770.

[3] Seely KA, Brents LK, Franks LN, Rajasekaran M, Zimmerman SM, Fantegrossi WE, Prather PL (October 2012). "AM-251 and rimonabant act as direct antagonists at mu-opioid receptors: implications for opioid/cannabinoid interaction studies". Neuropharmacology. 63 (5): 905–915. doi:10.1016/j.neuropharm.2012.06.046. PMC 3408547. PMID 22771770.

[4] Carpi S, Fogli S, Romanini A, Pellegrino M, Adinolfi B, Podestà A, et al. (August 2015). "AM251 induces apoptosis and G2/M cell cycle arrest in A375 human melanoma cells" (PDF). Anti-Cancer Drugs. 26 (7): 754–762. doi:10.1097/CAD.0000000000000246. hdl:11568/750318. PMID 25974027. S2CID 205526223. Archived (PDF) from the original on July 2, 2021.

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See also

References