Reference : Analogues and homologues of N-palmitoylethanolamide, a putative endogenous CB(2) cann...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/10993/5742
Analogues and homologues of N-palmitoylethanolamide, a putative endogenous CB(2) cannabinoid, as potential ligands for the cannabinoid receptors
English
Lambert, D. M. [> >]
DiPaolo, F. G. [> >]
Sonveaux, P. [> >]
Kanyonyo, M. [> >]
Govaerts, S. J. [> >]
Hermans, E. [> >]
Bueb, Jean-Luc mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit >]
Delzenne, N. M. [> >]
Tschirhart, Eric mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Life Science Research Unit >]
1999
Biochimica et Biophysica Acta
1440
2-3
266-74
Yes (verified by ORBilu)
0006-3002
[en] Animals ; Rats ; Receptor, Cannabinoid, CB2 ; Receptors, Drug ; Spleen ; Transfection ; Tumor Cells, Cultured ; pharmacology ; antagonists & inhibitors ; drug effects ; genetics ; Pyrazoles ; Piperidines ; Naphthalenes ; Benzoxazines ; Binding, Competitive ; CHO Cells ; Cannabinoids ; Cricetinae ; Cyclohexanols ; Ethanolamines ; Humans ; Molecular Structure ; Morpholines ; metabolism
[en] The presence of CB(2) receptors was reported in the rat basophilic cell line RBL-2H3 and N-palmitoylethanolamide was proposed as an endogenous, potent agonist of this receptor. We synthesized a series of 10 N-palmitoylethanolamide homologues and analogues, varying by the elongation of the fatty acid chain from caproyl to stearoyl and by the nature of the amide substituent, respectively, and evaluated the affinity of these compounds to cannabinoid receptors in the rat spleen, RBL-2H3 cells and CHO-CB(1) and CHO-CB(2) receptor-transfected cells. In rat spleen slices, CB(2) receptors were the predominant form of the cannabinoid receptors. No binding of [(3)H]SR141716A was observed. [(3)H]CP-55,940 binding was displaced by WIN 55,212-2 and anandamide. No displacement of [(3)H]CP-55,940 or [(3)H]WIN 55,212-2 by palmitoylethanolamide derivatives was observed in rat spleen slices. In RBL-2H3 cells, no binding of [(3)H]CP-55,940 or [(3)H]WIN 55,212-2 could be observed and conversely, no inhibitory activity of N-palmitoylethanolamide derivatives and analogues was measurable. These compounds do not recognize the human CB(1) and CB(2) receptors expressed in CHO cells. In conclusion, N-palmitoylethanolamide was, in our preparations, a weak ligand while its synthesized homologues or analogues were essentially inactive. Therefore, it seems unlikely that N-palmitoylethanolamide is an endogenous agonist of the CB(2) receptors but it may be a compound with potential therapeutic applications since it may act via other mechanisms than cannabinoid CB(1)-CB(2) receptor interactions.
http://hdl.handle.net/10993/5742

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