Deuterated docosahexaenoic acid protects against oxidative stress and geographic atrophy-like retinal degeneration in a mouse model with iron overload.

Autor:	Liu Y; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Bell BA; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Song Y; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Zhang K; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Anderson B; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Axelsen PH; Department of Pharmacology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Bohannan W; Departments of Cell Biology and Ophthalmology, University of Oklahoma Health Sciences Center and the Dean McGee Eye Institute, Oklahoma City, Oklahoma, USA., Agbaga MP; Departments of Cell Biology and Ophthalmology, University of Oklahoma Health Sciences Center and the Dean McGee Eye Institute, Oklahoma City, Oklahoma, USA., Park HG; Dell Pediatric Research Institute, University of Texas at Austin, Austin, Texas, USA., James G; Dell Pediatric Research Institute, University of Texas at Austin, Austin, Texas, USA., Brenna JT; Dell Pediatric Research Institute, University of Texas at Austin, Austin, Texas, USA., Schmidt K; Retrotope, Inc., Los Altos, California, USA., Dunaief JL; F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA., Shchepinov MS; Retrotope, Inc., Los Altos, California, USA.
Jazyk:	angličtina
Zdroj:	Aging cell [Aging Cell] 2022 Apr; Vol. 21 (4), pp. e13579. Date of Electronic Publication: 2022 Mar 08.
DOI:	10.1111/acel.13579
Abstrakt:	Oxidative stress plays a central role in age-related macular degeneration (AMD). Iron, a potent generator of hydroxyl radicals through the Fenton reaction, has been implicated in AMD. One easily oxidized molecule is docosahexaenoic acid (DHA), the most abundant polyunsaturated fatty acid in photoreceptor membranes. Oxidation of DHA produces toxic oxidation products including carboxyethylpyrrole (CEP) adducts, which are increased in the retinas of AMD patients. In this study, we hypothesized that deuterium substitution on the bis-allylic sites of DHA in photoreceptor membranes could prevent iron-induced retinal degeneration by inhibiting oxidative stress and lipid peroxidation. Mice were fed with either DHA deuterated at the oxidation-prone positions (D-DHA) or control natural DHA and then given an intravitreal injection of iron or control saline. Orally administered D-DHA caused a dose-dependent increase in D-DHA levels in the neural retina and retinal pigment epithelium (RPE) as measured by mass spectrometry. At 1 week after iron injection, D-DHA provided nearly complete protection against iron-induced retinal autofluorescence and retinal degeneration, as determined by in vivo imaging, electroretinography, and histology. Iron injection resulted in carboxyethylpyrrole conjugate immunoreactivity in photoreceptors and RPE in mice fed with natural DHA but not D-DHA. Quantitative PCR results were consistent with iron-induced oxidative stress, inflammation, and retinal cell death in mice fed with natural DHA but not D-DHA. Taken together, our findings suggest that DHA oxidation is central to the pathogenesis of iron-induced retinal degeneration. They also provide preclinical evidence that dosing with D-DHA could be a viable therapeutic strategy for retinal diseases involving oxidative stress. (© 2022 The Authors. Aging Cell published by Anatomical Society and John Wiley & Sons Ltd.)
Databáze:	MEDLINE
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