A saturated N-acylethanolamine other than N-palmitoyl ethanolamine with anti-inflammatory properties: a neglected story...

Journal of Neuroendocrinology
M Dalle CarbonareA Leon

Abstract

N-acylethanolamines, which include the endocannabinoid anandamide and the cannabinoid receptor-inactive saturated compounds N-palmitoyl ethanolamine and N-stearoyl ethanolamine, are ethanolamines of long-chain fatty acids degraded by fatty acid amide hydrolase (FAAH) known to accumulate in degenerating tissues and cells. Whilst much evidence supports a protective anti-inflammatory role of both anandamide and N-palmitoyl ethanolamine, very little information is available with regard to the bioactivity of N-stearoyl ethanolamine. Employing a murine model of passive IgE-induced cutaneous anaphylaxis, we have found that N-stearoyl ethanolamine is endowed with marked anti-inflammatory properties in vivo, supporting the hypothesis that endogenous N-stearoyl ethanolamine is, in analogy to N-palmitoyl ethanolamine, a bioactive signalling lipid capable of downregulating allergic inflammation in the skin. This effect, although mimicked by synthetic, non-selective, CB(1)/CB(2) receptor agonists, such as WIN55, 212-2, was not sensitive to CB(1) or CB(2) receptor antagonists, but rather was fully reversed by capsazepine, a competitive antagonist of the TRPV1 receptor. Moreover, CB(1) receptor antagonists, although effective in antagonising ...Continue Reading

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