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. 2004 May 15;380(Pt 1):265–272. doi: 10.1042/BJ20031812

Further evidence for the existence of a specific process for the membrane transport of anandamide.

Alessia Ligresti 1, Enrico Morera 1, Mario Van Der Stelt 1, Krisztina Monory 1, Beat Lutz 1, Giorgio Ortar 1, Vincenzo Di Marzo 1
PMCID: PMC1224156  PMID: 14969584

Abstract

Indirect evidence for the existence of a specific protein-mediated process for the cellular uptake of endocannabinoids has been reported, but recent results suggested that such a process, at least for AEA [ N -arachidonoylethanolamine (anandamide)], is facilitated uniquely by its intracellular hydrolysis by FAAH (fatty acid amide hydrolase) [Glaser, Abumrad, Fatade, Kaczocha, Studholme and Deutsch (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 4269-4274]. In the present study, we show that FAAH alone cannot account for the facilitated diffusion of AEA across the cell membrane. In particular, (i) using a short incubation time (90 s) to avoid AEA hydrolysis by FAAH, AEA accumulation into rat basophilic leukaemia or C6 cells was saturable at low microM concentrations of substrate and non-saturable at higher concentrations; (ii) time-dependent and, at low microM concentrations of substrate, saturable AEA accumulation was observed also using mouse brain synaptosomes; (iii) using synaptosomes prepared from FAAH-deficient mice, saturable AEA accumulation was still observed, although with a lower efficacy; (iv) when 36 AEA and N -oleoylethanolamine analogues, most of which with phenyl rings in the polar head group region, were tested as inhibitors of AEA cellular uptake, strict structural and stereochemical requirements were needed to observe significant inhibition, and in no case the inhibition of FAAH overlapped with the inhibition of AEA uptake; and (v) AEA biosynthesis by cells and sensory neurons was followed by AEA release, and this latter process, which cannot be facilitated by FAAH, was still blocked by an inhibitor of AEA uptake. We suggest that at least one protein different from FAAH is required to facilitate AEA transport across the plasma membrane in a selective and bi-directional way.

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Selected References

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