Legal status
Legal status
CAS Number 444912-48-5 N
PubChem (CID) 10141893
ChemSpider 8317404 YesY
Chemical and physical data
Formula C22H22IN3O3
Molar mass 503.333 g/mol
3D model (Jmol) Interactive image
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AM-1241 (1-(methylpiperidin-2-ylmethyl)-3-(2-iodo-5-nitrobenzoyl)indole) is a chemical from the aminoalkylindole family that acts as a potent and selective agonist for the cannabinoid receptor CB2,[1][2] with a Ki of 3.4nM at CB2 and 80x selectivity over the related CB1 receptor.[3][4] It has analgesic effects in animal studies, particularly against "atypical" pain such as hyperalgesia and allodynia.[5] This is thought to be mediated through CB2-mediated peripheral release of endogeous opioid peptides,[6] as well as direct activation of the TRPA1 channel.[7] It has also shown efficacy in the treatment of amyotrophic lateral sclerosis in animal models.[8][9]

Effects in bone cancer model

The antihyperalgesic effects of AM-1241 were investigated in a murine bone cancer model. Sarcoma cells were injected into the femur of a mouse, and then mice were injected twice daily with AM-1241. Treatment with AM-1241 reduced both spontaneous and evoked pain, as well as reducing the bone loss and subsequent fractures due to the tumor. Pretreatment with the CB2 antagonist SR-144,528 reversed the acute effects of AM-1241 on both spontaneous and evoked pain, while having no effect on its own.[10]

See also


  1. Yao BB; et al. (September 2006). "In vitro pharmacological characterization of AM1241: a protean agonist at the cannabinoid CB2 receptor?". British Journal of Pharmacology. 149 (2): 145–54. doi:10.1038/sj.bjp.0706838. PMC 2013801Freely accessible. PMID 16894349.
  2. Bingham B; et al. (August 2007). "Species-specific in vitro pharmacological effects of the cannabinoid receptor 2 (CB2) selective ligand AM1241 and its resolved enantiomers". British Journal of Pharmacology. 151 (7): 1061–70. doi:10.1038/sj.bjp.0707303. PMC 2042933Freely accessible. PMID 17549048.
  3. Ibrahim MM; et al. (September 2003). "Activation of CB2 cannabinoid receptors by AM1241 inhibits experimental neuropathic pain: pain inhibition by receptors not present in the CNS". Proceedings of the National Academy of Sciences of the United States of America. 100 (18): 10529–33. doi:10.1073/pnas.1834309100. PMC 193595Freely accessible. PMID 12917492.
  4. Marriott KS, Huffman JW (2008). "Recent advances in the development of selective ligands for the cannabinoid CB(2) receptor". Current Topics in Medicinal Chemistry. 8 (3): 187–204. doi:10.2174/156802608783498014. PMID 18289088.
  5. Beltramo M; et al. (March 2006). "CB2 receptor-mediated antihyperalgesia: possible direct involvement of neural mechanisms". The European Journal of Neuroscience. 23 (6): 1530–8. doi:10.1111/j.1460-9568.2006.04684.x. PMID 16553616.
  6. Ibrahim MM; et al. (February 2005). "CB2 cannabinoid receptor activation produces antinociception by stimulating peripheral release of endogenous opioids". Proceedings of the National Academy of Sciences of the United States of America. 102 (8): 3093–8. doi:10.1073/pnas.0409888102. PMC 549497Freely accessible. PMID 15705714.
  7. Akopian AN, Ruparel NB, Patwardhan A, Hargreaves KM (January 2008). "Cannabinoids desensitize capsaicin and mustard oil responses in sensory neurons via TRPA1 activation". Journal of Neuroscience. 28 (5): 1064–75. doi:10.1523/JNEUROSCI.1565-06.2008. PMID 18234885.
  8. Kim K, Moore DH, Makriyannis A, Abood ME (August 2006). "AM1241, a cannabinoid CB2 receptor selective compound, delays disease progression in a mouse model of amyotrophic lateral sclerosis". European Journal of Pharmacology. 542 (1-3): 100–5. doi:10.1016/j.ejphar.2006.05.025. PMID 16781706.
  9. Shoemaker JL; et al. (April 2007). "The CB2 cannabinoid agonist AM-1241 prolongs survival in a transgenic mouse model of amyotrophic lateral sclerosis when initiated at symptom onset". Journal of Neurochemistry. 101 (1): 87–98. doi:10.1111/j.1471-4159.2006.04346.x. PMC 2819701Freely accessible. PMID 17241118.
  10. Lozano, Alysia (April 2010). "A cannabinoid 2 receptor agonist attenuates bone cancer-induced pain and bone loss". Life Sciences. 86 (17-18): 646–53. doi:10.1016/j.lfs.2010.02.014. PMC 2871326Freely accessible. PMID 20176037.

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