4-O-Methylhonokiol is a CB2 receptor ligand (Ki = 50 nM), showing inverse agonism and partial agonism via different pathways (cAMP and Ca2+), which potently inhibits osteoclastogenesis.[3] 4-O-Methylhonokiol further attenuates memory impairment in presenilin 2 mutant mice through reduction of oxidative damage and inactivation of astrocytes and the ERK pathway.[4] The different neuroprotective effects reported in rodent models may be mediated via CB2 receptors.[5] 4-O-Methylhonokiol activates CB2 receptors and also inhibits the oxygenation of the major endocannabinoid 2-AG via COX-2 in a substrate-selective manner, thus leading to potential synergistic effects at CB receptors.[6] The same study also provided data that
4-O-methylhonokiol can readily pass the blood–brain barrier.
References
^Clark, Alice M.; El-Feraly, Arouk S.; Li, Wen-Shyong (1981). "Antimicrobial activity of phenolic constituents ofmagnolia grandiflora L". Journal of Pharmaceutical Sciences. 70 (8): 951–2. doi:10.1002/jps.2600700833. PMID7310672.
^Chandra, Amitabh; Nair, Muraleedharan (2007). "Supercritical Carbon Dioxide Extraction and Quantification of Bioactive Neolignans from Magnolia virginiana Flowers". Planta Medica. 61 (2): 192–5. doi:10.1055/s-2006-958051. PMID7753933. S2CID28117395.
^Schuehly, Paredes; Kleyer, Huefner; Anavi-Goffer, Raduner; Altmann, Gertsch (2011). "Mechanisms of osteoclastogenesis inhibition by a novel class of biphenyl-type cannabinoid CB(2) receptor inverse agonists". Chemistry and Biology. 18 (8): 1053–64. doi:10.1016/j.chembiol.2011.05.012. PMID21867920.
^Lee, Y. J.; Choi, I. S.; Park, M. H.; Lee, Y. M.; Song, J. K.; Kim, Y. H.; Kim, K. H.; Hwang, D. Y.; Jeong, J. H.; Yun, Y. P.; Oh, K. W.; Jung, J. K.; Han, S. B.; Hong, J. T. (2011). "4-O-Methylhonokiol attenuates memory impairment in presenilin 2 mutant mice through reduction of oxidative damage and inactivation of astrocytes and the ERK pathway". Free Radical Biology and Medicine. 50 (1): 66–77. doi:10.1016/j.freeradbiomed.2010.10.698. PMID20974250.