Metabolic studies of synaptamide in an immortalized dopaminergic cell line.

Autor: Sonti S; Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States. Electronic address: sonti.s@husky.neu.edu., Tolia M; Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States., Duclos RI Jr; Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States., Loring RH; Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States., Gatley SJ; Department of Pharmaceutical Sciences, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, United States.
Jazyk: angličtina
Zdroj: Prostaglandins & other lipid mediators [Prostaglandins Other Lipid Mediat] 2019 Apr; Vol. 141, pp. 25-33. Date of Electronic Publication: 2019 Feb 11.
DOI: 10.1016/j.prostaglandins.2019.02.002
Abstrakt: Introduction: Synaptamide, the N-acylethanolamine of docosahexaenoic acid (DHA), is structurally similar to the endocannabinoid N-arachidonoylethanolamine, anandamide. It is an endogenous ligand at the orphan G-protein coupled receptor 110 (GPR110; ADGRF1), and induces neuritogenesis and synaptogenesis in hippocampal and cortical neurons, as well as neuronal differentiation in neural stem cells.
Purpose: Our goal was to characterize the metabolic fate (synthesis and metabolism) of synaptamide in a dopaminergic cell line using immortalized fetal mesencephalic cells (N27 cells). Both undifferentiated and differentiating N27 cells were used in this study in an effort to understand synaptamide synthesis and metabolism in developing and adult cells.
Methods: Radiotracer uptake and hydrolysis assays were conducted in N27 cells incubated with [1- 14 C]DHA or with one of two radioisotopomers of synaptamide: [α,β- 14 C 2 ]synaptamide and [1- 14 C-DHA]synaptamide.
Results: Neither differentiated nor undifferentiated N27 cells synthesized synaptamide from radioactive DHA, but both rapidly incorporated radioactivity from exogenous synaptamide into membrane phospholipids, regardless of which isotopomer was used. Pharmacological inhibition of fatty acid amide hydrolase (FAAH) reduced formation of labeled phospholipids in undifferentiated but not differentiated cells.
Conclusions: In undifferentiated cells, synaptamide uptake and metabolism is driven by its enzymatic hydrolysis (fatty acid amide hydrolase; FAAH), but in differentiating cells, the process seems to be FAAH independent. We conclude that differentiated and undifferentiated N27 cells utilize synaptamide via different mechanisms. This observation could be extrapolated to how different mechanisms may be in place for synaptamide uptake and metabolism in developing and adult dopaminergic cells.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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