Abstract
Neurons are especially susceptible to oxidative damage, which is increasingly implicated in neurodegenerative disease. Certain N-acylethanolamines (NAEs) have been shown to protect neurons from oxidative stress. Since glaucoma may be considered a neurodegenerative disorder and the survival of retinal neurons could also be influenced by N-acylethanolamines, our goal was to quantify changes in certain N-acylethanolamine species and their oxylipin derivatives in the retina of a mouse model for glaucoma. We also sought to identify relationships between these and parameters of glaucoma disease development, specifically intraocular pressure, visual acuity, and contrast sensitivity. Five N-acylethanolamine species and three NAE oxylipin derivatives were quantified in retina from young and aged DBA/2Crl mice. N-Acylethanolamines and NAE-oxylipins in retinal extracts were quantified against deuterated standards by isotope dilution gas chromatography–mass spectrometry. Levels (nmol/g dry weight) of N-arachidonoylethanolamine (anandamide; NAE 20:4) were significantly (p = 0.008) decreased in aged (2.875 ± 0.6702) compared to young animals (5.175 ± 0.971). Conversely, the anandamide oxylipin, 15(S)-HETE ethanolamide (15(S)-HETE EA), was significantly (p = 0.042) increased in aged (0.063 ± 0.009) compared to young animals (0.039 ± 0.011). Enzymatic depletion of the anandamide pool by 15-lipoxygenase and consequent accumulation of 15(S)-HETE ethanolamine may contribute to decreased visual function in glaucomatous mice. Since N-acylethanolamines effectively attenuate glaucoma pathogenesis and associated visual impairment, our data provides additional rationale and novel targets for glaucoma therapies.
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Abbreviations
- 9NAE-HOD:
-
(9S,12Z,10E)-9-Hydroxy-10,12 octadecadienoylethanolamine
- 13NAE-HOD:
-
(13S,9Z,11E)-13-Hydroxy-9,11-octadecadienoylethanolamine
- 15(S)-HETE EA:
-
15(S)-Hydroxy-N-(2-hydroxyethyl)-5Z,8Z,11Z,13E-eicosatetraenamide
- BSTFA:
-
N,O-Bis(trimethylsilyl) trifluoroacetamide
- CS:
-
Contrast sensitivity
- GC/MS:
-
Gas chromatography–mass spectrometry
- IOP:
-
Intraocular pressure
- LC-APCI-MS:
-
Liquid chromatography–atmospheric pressure chemical ionization–mass spectrometry
- LCPUFA:
-
Long chain polyunsaturated fatty acids
- NAE:
-
N-Acylethanolamine
- NAE 16:0:
-
N-Palmitoylethanolamine, N-(2-hydroxyethyl)-hexadecanamide
- NAE 18:0:
-
N-Stearoylethanolamine, N-(octadecanoyl)-ethanolamine
- NAE 18:1:
-
N-Oleoylethanolamine, N-(9Z-octadecenoyl)-ethanolamine
- NAE 18:2:
-
N-Linoleoylethanolamine, N-(2-hydroxyethyl)-9Z,12Z-octadecadienamide
- NAE 20:4:
-
Anandamide, N-arachidonoylethanolamine, N-(2-hydroxyethyl)-5Z,8Z,11Z,14Z-eicosatetraenamide
- RP-HPLC:
-
Reverse phase-high performance liquid chromatography
- TMS:
-
Trimethylsilyl
- VA:
-
Visual acuity
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Acknowledgments
The present study was supported in part by grants from the National Eye Institute (EY022774), the National Institute on Aging (AG010485, AG022550 and AG027956), the National Center for Research Resources and National Institute of General Medical Sciences (RR027093) of the National Institutes of Health (PK). The content of the present study is the sole responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Lipid analysis was supported by a grant from the US Department of Energy, Office of Science, Basic Energy Sciences program (DE-FG02-05ER15647; KDC). K.D.C. is grateful to the US National Science Foundation for providing individual research and development leave to assist in the supervision of this research and the preparation of this manuscript by agreement under the Intergovernmental Personnel Act. Additional partial support was provided by the Felix and Carmen Sabates Missouri Endowed Chair in Vision Research, a Challenge Grant from Research to Prevent Blindness and the Vision Research Foundation of Kansas City (PK) and is gratefully acknowledged. The authors thank Margaret, Richard and Sara Koulen for their generous support and encouragement.
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Montgomery, C.L., Keereetaweep, J., Johnson, H.M. et al. Changes in Retinal N-Acylethanolamines and their Oxylipin Derivatives During the Development of Visual Impairment in a Mouse Model for Glaucoma. Lipids 51, 857–866 (2016). https://doi.org/10.1007/s11745-016-4161-x
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DOI: https://doi.org/10.1007/s11745-016-4161-x