Endogenous molecules stimulating N-acylethanolamine-hydrolyzing acid amidase (NAAA)

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URI http://shark.lib.kagawa-u.ac.jp/kuir/metadata/27644
Title
Endogenous molecules stimulating N-acylethanolamine-hydrolyzing acid amidase (NAAA)
File
Description

Abstract

Fatty acid amide hydrolase (FAAH) plays the central role in the degradation of bioactive N-acylethanolamines such as the endocannabinoid arachidonoylethanolamide (anandamide) in brain and peripheral tissues. A lysosomal enzyme referred to as N-acylethanolamine-hydrolyzing acid amidase (NAAA) catalyzes the same reaction with preference to palmitoylethanolamide, an endogenous analgesic and neuroprotective substance, and is therefore expected as a potential target of therapeutic drugs. In the in vitro assays thus far performed, the maximal activity of NAAA was achieved in the presence of both nonionic detergent (Triton X-100 or Nonidet P-40) and the SH reagent dithiothreitol. However, endogenous molecules that might substitute for these synthetic compounds remain poorly understood. Here, we examined stimulatory effects of endogenous phospholipids and thiol compounds on recombinant NAAA. Among different phospholipids tested, choline- or ethanolamine-containing phospholipids showed potent effects, and 1 mM phosphatidylcholine increased NAAA activity by 6.6-fold. Concerning endogenous thiol compounds, dihydrolipoic acid at 0.1-1 mM was the most active, causing 8.5-9.0-fold stimulation. These results suggest that endogenous phospholipids and dihydrolipoic acid may contribute in keeping NAAA active in lysosomes. Even in the presence of phosphatidylcholine and dihydrolipoic acid, however, the preferential hydrolysis of palmitoylethanolamide was unaltered. We also investigated a possible compensatory induction of NAAA mRNA in brain and other tissues of FAAH-deficient mice. However, NAAA expression levels in all the tissues examined were not significantly altered from those in wild-type mice.

KEYWORDS:

N-Acylethanolamine-hydrolyzing acid amidase; NAAA; dihydrolipoic acid; fatty acid amide hydrolase; palmitoylethanolamide; phospholipid

(医博甲605)

Author
著者 田井 達也
著者(ヨミ) タイ タツヤ
著者(別表記) Tai Tatsuya
Publication Title
ACS Chemical Neuroscience
Publication Title Alternative
ACS Chem Neurosci.
Volume
3
Issue
5
Start Page
379
End Page
385
Publisher
American Chemical Society
Published Date
2012-01-27
ISSN
1948-7193
NCID
AA1259974X
PMID
22860206
DOI
10.1021/cn300007s
Resource Type
Thesis or Dissertation
Language
eng
Relation
PMCID: PMC3382453
Resource URL
https://doi.org/10.1021/cn300007s
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3382453/
Text Version
none
Grant ID
博甲第605号
Grant Date
2015-03-24
Degree Name
博士(医学)
Grantor
香川大学
Set
香川大学
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