title: Pitfalls and solutions in assaying anandamide transport in cells.
abstract: Nonspecific binding of anandamide to plastic exhibits many features that could be mistaken as biological processes, thereby representing an important source of conflicting data on the uptake and release of this lipophilic substance. Herein, we propose an improved method to assay anandamide transport, by using glass slides (i.e., coverslips) as physical support to grow cells. Although the results obtained using plastic do not differ significantly from those obtained using glass, the new procedure has the advantage of being faster, simpler, and more accurate. In fact, the lack of aspecific adsorption of anandamide to the glass surface yields a lower background and a higher precision and accuracy in determining transport kinetics, especially for the export process. Remarkably, the kinetic parameters of anandamide uptake obtained with the old and the new procedures may be similar or different depending on the cell type, thus demonstrating the complexity of the interference of plastic on the transport process. In addition, the novel procedure is particularly suitable for visualization and measurement of anandamide transport in intact cells by using a biotinylated derivative in confocal fluorescence microscopy.
authors.affiliation: Department of Biomedical Sciences, University of Teramo, 64100 Teramo, Italy.
authors.forename: Sergio
authors.initials: S
authors.lastname: Oddi
authors.forename: Filomena
authors.initials: F
authors.lastname: Fezza
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Catanzaro
authors.forename: Chiara
authors.initials: C
authors.lastname: De Simone
authors.forename: Mariangela
authors.initials: M
authors.lastname: Pucci
authors.forename: Daniele
authors.initials: D
authors.lastname: Piomelli
authors.forename: Alessandro
authors.initials: A
authors.lastname: Finazzi-Agrò
authors.forename: Mauro
authors.initials: M
authors.lastname: Maccarrone
mesh_terms: D000327:Adsorption; D001095:Arachidonic Acids / Q000737:chemistry* / Q000378:metabolism*; D016477:Artifacts; D001692:Biological Transport; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D063388:Endocannabinoids; D005898:Glass / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D010969:Plastics / Q000737:chemistry; D053284:Polyunsaturated Alkamides / Q000737:chemistry* / Q000378:metabolism*; D017640:Silicates / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013499:Surface Properties
chemical_list: D001095:Arachidonic Acids; D063388:Endocannabinoids; D010969:Plastics; D053284:Polyunsaturated Alkamides; D017640:Silicates; C078814:anandamide
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