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Palmitoyl ethanolamide (PEA) is an endogenous cannabinoid found in brain, liver, and other mammalian tissues.1 PEA has also been isolated from egg yolk, and found to have anti-anaphylactic and anti-inflammatory activity in vitro.2 PEA is an endocannabinoid which has been shown to significantly elevate cAMP in cells expressing CB2 receptors. However, its affinity for CB2 receptors is relatively low, at about 10 µM. CB1 receptors have no appreciable affinity for PEA.3
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1
Bachur, N.R., Masek, K., Melmon, K.L., et al. Fatty acid amides of ethanolamine in mammalian tissues. J Biol Chem 240 1019-1024 (1965).
2
Ganley, O.H., Graessle, O.E., Robinson, H.J., et al. Anti-inflammatory activity of compounds obtained from egg yolk, peanut oil, and soybean lecithin. J Lab Clin Med 51 709-714 (1958).
3
Devane, W.A., Hanus, L., Breuer, A., et al. Isolation and structure of a brain constituent that binds to the cannabinoid receptor. Science 258 1946-1949 (1992).
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