Microconstituants bioactifs des végétaux et pathologies oculaires

2012

National audience

The LDL receptor in the retina: the missing link in aging, the new target in dietary prevention

2012

National audience; Purpose: The discovery of the LDL receptor (LDLR) in 1985 by Brown and Goldstein was awarded by a Nobel Prize. The LDLR has initially been identified for its role in mediating the endocytosis of LDL particles in the vascular endothelium. The deposition of lipids, including cholesterol and cholesteryl esters in Bruch’s Membrane in the one hand, and in the vessel intima in the other hand, is one of the common features of age related macular degeneration (AMD) and cardiovascular disease (CVD). Dietary habits with high intakes of omega 3 long chain fatty acids (LCFA) have been associated with AMD prevention. Similar effects have been demonstrated in CVD prevention. The mechan…

No consequence of dietary omega-3 polyunsaturated fatty acid deficiency on the severity of scopolamine-induced dry eye

2008

International audience; Purpose:Epidemiological studies suggest that dietary omega-3 polyunsaturated fatty acids (PUFAs) may protect against prevalence of dry eye. This work aimed to evaluate whether a dietary deficiency in omega-3 PUFAs may increase the severity of dry eye in a scopolamine-induced rat model. Methods:Three consecutive generations of Lewis rats were bred under diets deprived of omega-3 PUFAs. Dry eye was experimentally induced by continuous scopolamine delivery in female animals from the third deficient generation and in female Lewis rats fed for three generations with a balanced diet. After 14 days of treatment, the clinical signs of ocular dryness were evaluated in vivo us…

Oxysterols: Influence on plasma membrane rafts microdomains and development of ocular diseases

2015

Oxidation of cholesterol into oxysterols is a major way of elimination of cholesterol from the liver and extrahepatic tissues, including the brain and the retina. Oxysterols are involved in various cellular processes. Numerous links have been established between oxysterols and several disorders such as neurodegenerative pathologies, retinopathies and atherosclerosis. Different components of the lipid layer such as sphingolipids, sterols and proteins participate to membrane fluidity and forme lipid rafts microdomains. Few data are available on the links between lipids rafts and oxysterols. The purpose of this review is to suggest the potential role of lipid rafts microdomains in the developm…

Decreasing dietary linoleic acid promotes long chain omega-3 fatty acid incorporation into rat retina and modifies gene expression

2011

International audience; Age-related macular degeneration (AMD) may be partially prevented by dietary habits privileging the consumption of ω3 long chain polyunsaturated fatty acids (ω3s) while lowering linoleic acid (LA) intake. The present study aimed to document whether following these epidemiological guidelines would enrich the neurosensory retina and RPE with ω3s and modulate gene expression in the neurosensory retina. Rat progenitors and pups were fed with diets containing low or high LA, and low or high ω3s. After scotopic single flash and 8-Hz-Flicker electroretinography, rat pups were euthanized at adulthood. The fatty acid profile of the neurosensory retina, RPE, liver, adipose tis…

Cholestérol et pathologies oculaires : focus sur le rôle de la cholestérol 24S-hydroxylase (CYP46A1) dans l’homéostasie du cholestérol

2015

Resume La retine est le tissu neurosensoriel de l’œil qui assure la transduction visuelle, c’est-a-dire le codage de l’information lumineuse en influx nerveux. Le terme « retine » regroupe l’association de la retine neurale et de l’epithelium pigmentaire retinien qui repose sur la membrane de Bruch. L’association physique de ces deux partenaires et leurs interactions metaboliques sont des elements indispensables au bon fonctionnement de la retine, a la fois en termes d’apport en nutriments et de maintien de l’homeostasie. Des dereglements de ces equilibres sont associes au vieillissement et a des pathologies comme la degenerescence maculaire liee a l’âge, premiere cause de malvoyance apres …

Serum omega-3 fatty acids are not associated with age-related macular degeneration

2012

Revue non indexée dans le JCR.; International audience; Evaluation of: Kabasawa S, Mori K, Horie-Inoue K et al. Associations of cigarette smoking but. not serum fatty acids with age-related macular degeneration in a Japanese population. Ophthalmology 118(6), 1082–1088 (2011). Age-related macular degeneration (AMD) is the leading cause of visual impairment in the elderly. in developed countries. Risk factors for AMD are classified into endogenous nonmodifiable. factors, including genetics and environmental factors such as smoking and dietary habits. Both. epidemiological and experimental studies suggest that dietary omega-3 long-chain fatty acids. would participate to prevent from the develo…

New insight into the genetics of age-related macular degeneration in connection with lipid metabolism

2010

Evaluation of: Zerbib J, Seddon JM, Richard F et al. rs5888 variant of SCARB1 gene is a possible susceptibility factor for age-related macular degeneration. PLoS ONE 4(10), e7341 (2009).Age-related macular degeneration (AMD) is the leading cause of visual loss in elderly populations of Western countries. According to demographic forecasts, and owing to the improvement in life expectancy, the number of people suffering from this pathology is expected to dramatically increase in the near future, thereby becoming a significant socioeconomic burden. There has been great progress in defining risk factors for AMD over the last few decades. Beyond advanced age, environmental and genetic factors ha…

Plasmalogens and cell‐cell communication between retinal glial cells

2017

National audience; Purpose Plasmalogens are glycerophospholipids containing a vinyl‐ether bond at sn‐1 position of their glycerol backbone and polyunsaturated fatty acids (PUFAs) at sn‐2. We have previously shown that plasmalogens are involved in the regulation of perinatal retinal vascular development and particularly in astrocyte template formation (Saab et al, PLoSONE 2012 9(6):e101076). Since retinal Müller cells and astrocytes can communicate through calcium waves and connexin 43‐rich gap junctions, the aim of our study was to determine whether a reduction of plasmalogen levels affects communication between retinal glial cells. Methods Primary Müller cells and astrocyte were isolated f…

Involvement of plasmalogens in post-natal retinal vascular development

2014

Objective: Proper development of retinal blood vessels is essential to ensure sufficient oxygen and nutrient supplies to the retina. It was shown that polyunsaturated fatty acids (PUFAs) could modulate factors involved in tissue vascularization. A congenital deficiency in ether-phospholipids, also termed "plasmalogens'', was shown to lead to abnormal ocular vascularization. Because plasmalogens are considered to be reservoirs of PUFAs, we wished to improve our understanding of the mechanisms by which plasmalogens regulate retinal vascular development and whether the release of PUFAs by calcium-independent phospholipase A2 (iPLA2) could be involved. [br/] Methods and Results: By characterizi…

Inflammatory cytokines decrease viability and alter ganglioside profile in retinal pigment epithelium cells

2013

Purpose Early stages of Age related Macular Degeneration (AMD) are characterized by dysfunction and degeneration of the retinal pigment epithelium (RPE) cells, which participate in the death of the overlying photoreceptors ultimately leading to loss of vision. Gangliosides (GG) make a wide and heterogeneous family of sialic-acid-containing glycosphingolipids, composed of a sugar chain branched on a ceramide. They are major components of cellular membranes, particularly abundant in the brain and nervous tissue, including retina. While their developmental and neuroprotective actions have been demonstrated, their precise role in retina’s function and its pathologies is still poorly understood.…

Lipid and fatty acid profile of the retina, RPE/choroid and lacrimal gland, and associations with dietary fatty acids in human subjects

2008

Purpose The contribution of dietary lipids to the accumulation of lipids in the retina during ageing and in the course of age related maculopathies remains under debate. Our objective was to establish associations between fatty acid profiles of ocular structures, and adipose tissue as a surrogate for the past dietary intake of the subjects. Methods Lipids and fatty acids were analyzed by tandem thin-layer chromatography-flame ionization detection and gas chromatography-flame ionization detection from the neural retina, RPE/choroid, lacrimal gland and adipose tissue, collected from 19 women and 8 men, aged 59–95 years. Results DHA concentrations in the neural retina were positively associate…

Dietary prevention of visual function and cognitive decline by omega-3 polyunsaturated fatty acids in Senescence Accelerated Mouse P8 (SAM P8)

2008

International audience; Purpose: : Neuronal tissues such as the brain and the retina contain elevated amounts of long-chain omega-3 polyunsaturated fatty acids (PUFAs) and particularly docosahexaenoic acid (DHA). DHA concentrations are known to decrease in the aging brain and are associated with cognitive decline. The senescence-accelerated mouse prone 8 (SAM P8) is a mouse model for aging that exhibits deficits in cognitive performances as well as alterations of retinal functionality (ARVO 2004 E-abstract 797). The aim of this study was to evaluate the effects of a dietary supplementation with DHA on mood, cognition and visual functionality of SAM P8 during aging. Methods: : SAM P8 mice we…

Essential omega-3 fatty acids tune microglial phagocytosis of synaptic elements in the developing brain

2019

SUMMARYOmega-3 fatty acids (n-3 polyunsaturated fatty acids; n-3 PUFAs) are essential for the functional maturation of the brain. Westernization of dietary habits in both developed and developing countries is accompanied by a progressive reduction in dietary intake of n-3 PUFAs. Low maternal intake of n-3 PUFAs has been linked to neurodevelopmental diseases in epidemiological studies, but the mechanisms by which a n-3 PUFA dietary imbalance affects CNS development are poorly understood. Active microglial engulfment of synaptic elements is an important process for normal brain development and altered synapse refinement is a hallmark of several neurodevelopmental disorders. Here, we identify …

Lipid profile of tenon's capsule in glaucoma patients

2009

International audience; Purpose: To provide data on the lipid profile of the Tenon’s capsule in Human glaucomatous eyes and to establish possible relationships with the short term outcome of filtration surgery. Methods: Fragments of Tenon’s capsule were collected during glaucoma surgery in patients suffering from open angle glaucoma (10 trabeculectomies and 17 non penetrating deep sclerectomies). The lipid profile of the human samples was determined by gas chromatography. A successful outcome after glaucoma surgery was defined by an intraocular pressure (IOP) ≤ 15 mmHg at 6 months without any IOP‐lowering agent. Results: We included 27 patients (12 males, 15 females) with a mean age of 65.5…

Lipid and fatty acid profile of the retina, retinal pigment epithelium/choroid, and the lacrimal gland, and associations with adipose tissue fatty ac…

2008

International audience; Accumulation of lipids within Bruch’s membrane (BrM) and between BrM and retinal pigment epithelium (RPE) accounts for one of the biological changes associated with normal aging and may contribute to the development of age-related maculopathies. The origin of these lipids is still being actively investigated. The relative contribution of plasma lipids and lipids coming from the neural retina remains a matter of controversy. Low-density lipoproteins (LDLs) have been reported to significantly participate in the retina’s lipid supply, after active remodeling within RPE. Meanwhile, RPE expresses the enzymatic machinery for synthesizing lipoprotein-like particles. The obj…

Red blood cell plasmalogens and docosahexaenoic acid are independently reduced in primary open-angle glaucoma

2009

International audience; Among several theories involved in the pathogenesis of primary open-angle glaucoma (POAG), the vascular theory considers the disease to be a consequence of reduced ocular blood flow associated with red blood cell abnormalities. Red blood cell membrane structure and function are influenced by their phospholipid composition. We investigated whether specific lipid entities that may affect the membrane physiology, namely, polyunsaturated fatty acids (PUFAs) and plasmalogens, are modified in POAG and whether these potential variations are related to the stage of glaucoma. Blood samples were collected from 31 POAG patients and 10 healthy individuals. The stage of glaucoma …

Pantethine Alters Lipid Composition and Cholesterol Content of Membrane Rafts, With Down-Regulation of CXCL12-Induced T Cell Migration

2015

Pantethine, a natural low-molecular-weight thiol, shows broad activity in a large range of essential cellular pathways. It has been long known as a hypolipidemic and hypocholesterolemic agent. We showed recently that it exerts a neuroprotective action in mouse models of cerebral malaria and Parkinson's disease through multiple mechanisms. In the present study we looked at its effects on membrane lipid rafts that serve as platforms for molecules engaged in cell activity, therefore providing a target against inappropriate cell response leading to chronic inflammation. We found that pantethine-treated cells showed a significant change in raft fatty acid composition and cholesterol content, wit…

Cholesterol and ocular pathologies: focus on the role of cholesterol-24S-hydroxylase in cholesterol homeostasis

2015

The retina is responsible for coding the light stimulus into a nervous signal that is transferred to the brain via the optic nerve. The retina is formed by the association of the neurosensory retina and the retinal pigment epithelium that is supported by Bruch’s membrane. Both the physical and metabolic associations between these partners are crucial for the functioning of the retina, by means of nutrient intake and removal of the cell and metabolic debris from the retina. Dysequilibrium are involved in the aging processes and pathologies such as age-related macular degeneration, the leading cause of visual loss after the age of 50 years inWestern countries. The retina is composed of severa…

Alteration of plasmalogens in erythrocytes of patients with diabetic retinopathy

2011

Purpose Plasmalogens are phospholipids characterized by a vinyl ether bond and the preferential esterification of polyunsaturated fatty acids (PUFA). We have shown that the lack of plasmalogens leads to abnormal retinal vascularisation. Because we hypothesize that plasmalogens are negative regulators of vascular development, we aimed to check their circulating levels in patients having a retinal pathology with vascular proliferation. Methods Blood samples were collected from 4 control subjects and 42 patients having proliferative or non-proliferative diabetic retinopathy (DR). Patients were classified according to the stage of DR. The plasmalogen content and the fatty acid composition of er…

Erythrocyte Phospholipid and Polyunsaturated Fatty Acid Composition in Diabetic Retinopathy

2014

Background: Long chain polyunsaturated fatty acids (LCPUFAs) including docosahexaenoic acid and arachidonic acid are suspected to play a key role in the pathogenesis of diabetes. LCPUFAs are known to be preferentially concentrated in specific phospholipids termed as plasmalogens. This study was aimed to highlight potential changes in the metabolism of phospholipids, and particularly plasmalogens, and LCPUFAs at various stages of diabetic retinopathy in humans. Methodology and Principal Findings: We performed lipidomic analyses on red blood cell membranes from controls and mainly type 2 diabetes mellitus patients with or without retinopathy. The fatty acid composition of erythrocytes was det…

RESVEGA, a Nutraceutical Omega-3/Resveratrol Supplementation, Reduces Angiogenesis in a Preclinical Mouse Model of Choroidal Neovascularization

2021

Age-related macular degeneration (AMD) is an eye disease that is characterized by damage to the central part of the retina, the macula, and that affects millions of people worldwide. At an advanced stage, a blind spot grows in the center of vision, severely handicapping patients with this degenerative condition. Despite therapeutic advances thanks to the use of anti-VEGF, many resistance mechanisms have been found to accentuate the visual deficit. In the present study, we explored whether supplementation with Resvega®, a nutraceutical formulation composed of omega-3 fatty acids and resveratrol, a well-known polyphenol in grapes, was able to counteract laser-induced choroidal neovascularizat…

A mouse model of in vivo chemical inhibition of retinal calcium-independent phospholipase A2 (iPLA2).

2013

International audience; Numerous studies have reported the implication of calcium-independent phospholipase A2 (iPLA2) in various biological mechanisms. Most of these works have used in vitro models and only a few have been carried out in vivo on iPLA2(-/-) mice. The functions of iPLA2 have been investigated in vivo in the heart, brain, pancreatic islets, and liver, but not in the retina despite its very high content in phospholipids. Phospholipids in the retina are known to be involved in several various key mechanisms such as visual transduction, inflammation or apoptosis. In order to investigate the implication of iPLA2 in these processes, this work was aimed to build an in vivo model of…

Nutrition for the Eye: Different Susceptibility of the Retina and the Lacrimal Gland to Dietary Omega-6 and Omega-3 Polyunsaturated Fatty Acid Incorp…

2007

International audience; The purpose of this study was to compare the susceptibility of the retina and the exorbital lacrimal gland to dietary supplies of long-chain omega-3 (omega 3) and omega-6 (omega 6) polyunsaturated fatty acids (LC-PUFAs). Male Wistar rats were fed a 5% lipid diet containing: (1) 10% eicosapentaenoic acid (EPA) and 7% docosahexaenoic acid (DHA), or (2) 10% gamma-linolenic acid (GLA), or (3) 10% EPA, 7% DHA and 10% GLA or (4) a balanced diet deprived of EPA, DHA and GLA for 3 months. Lipids were extracted from plasma phospholipids, retina and exorbital lacrimal gland, and fatty acid composition was determined by gas chromatography. Dietary supplementation with EPA and D…

Lipid nutrition and eye health

2010

 Revue non indexée dans le JCR.; International audience; According to demographic forecasts, the elderly population will represent a growing part of the developed societies in the near future. Eye diseases are the second most prevalent pathologies after the age of 65 years. Age-related macular degeneration (AMD) is the leading cause of irreversible vision loss in western countries. The number of people suffering from ocular pathologies is expected to increase sharply in the near future, becoming a socio-economic burden. Recent data indicate that lipid nutrients may represent new tools in the prevention of eye diseases, and especially AMD.

The hedgehog receptor patched is involved in cholesterol transport.

2011

International audience; BACKGROUND: Sonic hedgehog (Shh) signaling plays a crucial role in growth and patterning during embryonic development, and also in stem cell maintenance and tissue regeneration in adults. Aberrant Shh pathway activation is involved in the development of many tumors, and one of the most affected Shh signaling steps found in these tumors is the regulation of the signaling receptor Smoothened by the Shh receptor Patched. In the present work, we investigated Patched activity and the mechanism by which Patched inhibits Smoothened. METHODOLOGY/PRINCIPAL FINDINGS: Using the well-known Shh-responding cell line of mouse fibroblasts NIH 3T3, we first observed that enhancement …

Comparative study of serine-plasmalogens in human retina and optic nerve: identification of atypical species with odd carbon chains

2012

International audience; The objective of this work was to detect and identify phosphatidylserine plasmalogen species in human ocular neurons represented by the retina and the optic nerve. Plasmalogens (vinyl-ether bearing phospholipids) are commonly found in the forms of phosphatidylcholine and phosphatidylethanolamine in numerous mammalian cell types, including the retina. While their biological functions are still unclear, the alteration of cellular plasmalogen content has been associated with several human disorders such as Rhizomelic Chondrodysplasia Punctata Type 2 and Primary Open-Angle Glaucoma.By using liquid-chromatography coupled to high resolution and tandem mass spectrometry, we…

ALDH1A3 Mutations Cause Recessive Anophthalmia and Microphthalmia

2013

Anophthalmia and microphthalmia (A/M) are early-eye-development anomalies resulting in absent or small ocular globes, respectively. A/M anomalies occur in syndromic or nonsyndromic forms. They are genetically heterogeneous, some mutations in some genes being responsible for both anophthalmia and microphthalmia. Using a combination of homozygosity mapping, exome sequencing, and Sanger sequencing, we identified homozygosity for one splice-site and two missense mutations in the gene encoding the A3 isoform of the aldehyde dehydrogenase 1 (ALDH1A3) in three consanguineous families segregating A/M with occasional orbital cystic, neurological, and cardiac anomalies. ALDH1A3 is a key enzyme in the…

A novel murine model of aging of the human retina

2008

Purpose Accumulation of lipids, and especially of cholesteryl esters, under the retinal pigment epithelium and within Bruch’s membrane is a normal feature of aging and has also been observed in human eyes with age-related maculopathy. Our objective was to evaluate the retinal phenotype of apoB100,LDLR-/- mice, a model for lipid metabolism dysfunction and potentially of aging of the retina. Methods ApoB100,LDLR-/- mice were studied at 7 and 14 months of age by standard scotopic and photopic electroretinography by comparison to control animals. Fundus images were obtained with a confocal SLO (Heidelberg Retina Angiograph). The integrity of the vascular system was investigated by means of fluo…

Fructose diet induced short-term impairment of cone sensitivity and gene expression in rat retina

2012

National audience; Abstract: Purpose A high fructose diet has been widely used to trigger insulin resistance in rodent; insulin resistance is one of the major risk factor for the development of type 2 diabetes. Thirty to 40% of diabetic patients develop diabetic retinopathy. In this study, we aimed to evaluate the short-term effect, at 1, 3, 5, 8 days, of a 60% fructose diet, on photoreceptor sensitivity and gene expression in the retina of Brown Norway rats. Methods: Flicker electroretinograms (8Hz) were recorded under anesthesia, from both eyes simultaneously in order to study sensitivity of photoreceptors. Then, rats were euthanized and enucleated. Retinae and posterior poles were collec…

Plasmalogens in the retina: From occurrence in retinal cell membranes to potential involvement in pathophysiology of retinal diseases

2014

Plasmalogens (Pls) represent a specific subclass of glycerophospholipids characterized by the presence of a vinyl-ether bond at the sn-1 position of glycerol. Pls are quantitatively important in membranes of neuronal tissues, including the brain and the retina, where they can represent until almost two-third of ethanolamine glycerophospholipids. They are considered as reservoirs of polyunsaturated fatty acids as several studies have shown that arachidonic and docosahexaenoic acids are preferentially esterified on Pls when compared to other glycerophospholipids. Reduced levels of Pls were observed in a number of neurodegenerative disorders such as glaucoma, the second leading cause of blindn…

Problématiques de la nutrition en ophtalmologie – application à la dégénérescence maculaire liée à l’âge

2014

Nutrition in ophthalmology – clinical application to age-related macular degeneration «Let food be your medicine.» This contribution from Hippocrates is still timely addressed, especially in the field of ophthalmology. Observational epidemiology reports close associations between food habits and the risk or prevention of several ocular pathologies such as cataract or Age-related Macular Degeneration (AMD). Anti-oxidant vitamins, minerals and lipids are the nutrients that have been the most widely studied. Interventional epidemiology and experimental works partially corroborated these findings. Unexpectedly, the benefit of long chain omega 3 polyunsaturated fatty acids in the prevention of l…

Assessment of environmental AMD risk factors in a population of patients suffering from stroke and myocardial infarction

2010

International audience; Purpose: Stroke and myocardial infarction are common diseases occurring in patients suffering from Age Macular Degeneration (AMD). We assessed the rate of AMD and AMD risk factors in patients suffering from recent stroke or myocardial infarction. Methods: Patients suffering from a recent stroke or myocardial infarction (less than 1 month) benefited from a thorough ophthalmic examination with the following measurements and evaluations: visual acuity, intraocular pressure, fundus photography, Raman spectroscopy and macular OCT. In the same time a food questionnaire was dispensed. Finally, blood samples to measure fatty acids and lutein were performed. Results: 74 patie…

Effect of dietary omega-3 and omega-6 fatty acids on IOP elevation, electroretinographic changes and retinal ganglion cell loss in a rat model of gla…

2008

Purpose To test the efficacy of dietary omega-3 and omega-6 fatty acids in a rat model of glaucoma induced by laser photocoagulation. Methods Rats were fed for 3 months with a diet containing either: 1) 17% of omega-3 fatty acids (10% EPA + 7% DHA), 2) 10% of omega-6 fatty acids (as GLA), or 3) a combination of both omega-3 and omega-6 fatty acids (10% EPA + 7% DHA + 10% GLA), by comparison with a control group of animals fed with a standard diet deprived of EPA, DHA and GLA. After 3 months of diet, glaucoma was induced in one eye of the animal by laser.IOP was regularly measured and the retinal function was evaluated by electroretinography (ERG) for 3 months. At the end of the experiment, …

In vivo consequences of cholesterol-24S-hydroxylase (CYP46A1) inhibition by voriconazole on cholesterol homeostasis and function in the rat retina

2014

International audience; Cholesterol 24S-hydroxylase (CYP46A1) converts cholesterol into 24S-hydroxycholesterol in neurons and participates in cholesterol homeostasis in the central nervous system, including the retina. We aimed to evaluate the consequences of CYP46A1 inhibition by voriconazole on cholesterol homeostasis and function in the retina. Rats received daily intraperitoneal injections of voriconazole (60 mg/kg), minocycline (22 mg/kg), voriconazole plus minocycline, or vehicle during five consecutive days. The rats were submitted to electroretinography to monitor retinal functionality. Cholesterol and 24S-hydroxycholesterol were measured in plasma, brain and retina by gas chromatog…

Consequences of dietary omega-3 polyunsaturated fatty acid deficiency on retinal function and intraocular pressure in the rat

2009

Purpose Omega-3 polyunsaturated fatty acids (ω3) are key components in nervous structures but their dietary intakes in the overall population are often below nutritional requirements. A chronic deficiency in ω3 is recognized to be associated with functional impairment of the retina. At the opposite, ω3 supplementation is associated with a reduced risk for AMD. The consequences of ω3 deficiency on other eye structures than the retina, such as ciliary bodies, are scarce. The purpose of our study was to compare the response of the retina and ciliary bodies to dietary ω3 deficiency in terms of fatty acid profile and eye functionality. Methods Two successive generations of Lewis rats (G1 and G2)…

ApoB100,LDLR-/- mice exhibit reduced electroretinographic response and cholesteryl esters deposits in the retina

2008

International audience; PURPOSE. To evaluate the retinal phenotype of 7- and 14-month-old apoB100,LDLR–/– mice, a relevant animal model of lipid metabolism dysfunction. METHODS. Single-flash electroretinograms were obtained from 7- and 14-month-old apoB100,LDLR–/– and control mice fed a standard diet under both scotopic and photopic conditions. Visual cycle retinoids were analyzed in eyes from dark-adapted mice. Retinal and choroidal vascularization was evaluated with scanning laser ophthalmoscopy. Fatty acids were analyzed in the retina. Esterified and free cholesterol was detected in eye cryosections. RESULTS. Scotopic and photopic b-wave amplitudes were significantly reduced in apoB100,L…

Early adaptive response of the retina to a pro-diabetogenic diet: Impairment of cone response and gene expression changes in high-fructose fed rats

2015

The lack of plasticity of neurons to respond to dietary changes, such as high fat and high fructose diets, by modulating gene and protein expression has been associated with functional and behavioral impairments that can have detrimental consequences. The inhibition of high fat-induced rewiring of hypothalamic neurons induced obesity. Feeding rodents with high fructose is a recognized and widely used model to trigger obesity and metabolic syndrome. However the adaptive response of the retina to short term feeding with high fructose is poorly documented. We therefore aimed to characterize both the functional and gene expression changes in the neurosensory retina of Brown Norway rats fed duri…

First international descriptive and interventional survey for cholesterol and non-cholesterol sterol determination by gas- and liquid-chromatography–…

2019

International audience; Serum concentrations of lathosterol, the plant sterols campesterol and sitosterol and the cholesterol metabolite 5alpha-cholestanol are widely used as surrogate markers of cholesterol synthesis and absorption, respectively. Increasing numbers of laboratories utilize a broad spectrum of well-established and recently developed methods for the determination of cholesterol and non-cholesterol sterols (NCS). In order to evaluate the quality of these measurements and to identify possible sources of analytical errors our group initiated the first international survey for cholesterol and NCS. The cholesterol and NCS survey was structured as a two-part survey which took place…

Xanthophylls: from blood to retina

2010

Xanthophylls are dietary lipophilic compounds. Among them, lutein and zeaxanthin are the major carotenoids found in the human lens and retina, and referred as macular pigment within the retina. Lutein and zeaxanthin cannot be synthesized endogenously. They may therefore be considered as essential and must be provided by adequate dietary intakes. Lutein and zeaxanthin are present in various food items, mainly in plants and fruits such as green vegetables or yellow-orange fruits, as well as in a few animal sources, such as egg yolk. Epidemiological studies consistently suggest that dietary lutein and zeaxanthin are protective factors against the development of Age-Related Maculopathies and Ag…

Apprehending ganglioside diversity: a comprehensive methodological approach

2015

Gangliosides make a wide family of glycosphingolipids ubiquitously expressed in mammalian tissues and particularly abundant in the brain and nervous system. They exhibit a huge diversity due to structural variations in both their oligosaccharidic chain and ceramide moiety, which represent a real analytical challenge. Since their discovery in the 1940s, methods have persistently improved until the emergence of Liquid Chromatography/Mass Spectrometry (LC/MS) which offers a high level of specificity and sensitivity and is suitable with high-throughput profiling studies. We describe here a comprehensive approach relying on various techniques and aiming at fully characterizing gangliosides in bi…

Étude animale de l’implantation du nerf auditif par voie transmodiolaire avec tentative de conservation de l’audition

2014

But de la presentation L’implantation du nerf auditif est reconsideree comme un moyen de rehabilitation auditive en pouvant resoudre des difficultes de placement de porte-electrodes dans des cas difficiles (cochlees ossifiees). Elle peut augmenter la specificite de la stimulation, diminuer la consommation energetique, reduire les interferences entre les electrodes et donner acces a des fibres codant pour les frequences graves. Les voies d’abord pour l’implantation du nerf auditif ont ete jusqu’a aujourd’hui invasifs. Nous avons etudie la faisabilite d’une implantation du nerf transmodiolaire via les cavites de l’oreille moyenne chez l’homme. Cette voie semble possible grâce a la navigation …

Short-Term Long Chain Omega3 Diet Protects from Neuroinflammatory Processes and Memory Impairment in Aged Mice

2011

Regular consumption of food enriched in omega3 polyunsaturated fatty acids (oméga3 PUFAs) has been shown to reduce risk of cognitive decline in elderly, and possibly development of Alzheimer's disease. Docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) are the most likely active components of oméga3-rich PUFAs diets in the brain. We therefore hypothesized that exposing mice to a DHA and EPA enriched diet may reduce neuroinflammation and protect against memory impairment in aged mice. For this purpose, mice were exposed to a control diet throughout life and were further submitted to a diet enriched in EPA and DHA during 2 additional months. Cytokine expression together with a thoroug…

Comparative study of post-natal retinal vascular development in mice models of iPLA2 inhibition and plasmalogen deficiency

2012

Purpose: Plasmalogens are particular phospholipids characterized by the presence of a vinyl-ether bond and of a polyunsaturated fatty acid (PUFA) at sn-1 and sn-2 positions of glycerol, respectively. Even if the plasmalogen content of organs and tissues is well documented, their biological functions are still enigmatic. Plasmalogen deficiency in DAPAT-/- mice leads to developmental abnormalities in retinal vasculature (Acar et al, ARVO 2007 E-Abstract 2978) and to persistent hyaloïd arteries. We hypothesize that plasmalogens regulate retinal vascular development through the liberation of PUFA by a plasmalogen-specific calcium-independent phospholipase A2 (iPLA2). We have performed a compara…

Metabolic syndrome triggered by high-fructose diet favors choroidal neovascularization and impairs retinal light sensitivity in the rat

2014

Diabetic retinopathy and age-related macular degeneration are the leading causes of blindness in Western populations. Although it is a matter of controversy, large-scale population-based studies have reported increased prevalence of age-related macular degeneration in patients with diabetes or diabetic retinopathy. We hypothesized that metabolic syndrome, one of the major risk factors for type 2 diabetes, would represent a favorable environment for the development of choroidal neovascularization, the main complication of age-related macular degeneration. The fructose-fed rat was used as a model for metabolic syndrome in which choroidal neovascularization was induced by laser photocoagulatio…

In situ hybridization of dihydroxyacetone phosphate acyltransferase, the regulating enzyme involved in plasmalogen biosynthesis

2005

International audience; In situ hybridization can be carried out using different methods. The experimenter has to choose various parameters: the type of tissue fixation, the time of incubation, and the duration of the exposure time. All these parameters are determinant for the sensitivity and the resolution of this technique. This publication of technical aspects described different experiments performed for in situ hybridization on liver tissue. We may conclude on the parameters to optimize each step of the hybridization procedure. Moreover, this technique could be transposed to the brain and applied to little structures with a light expression of DHAP-AT.

Intraocular pressure and central corneal thickness in an old French population: The MONTRACHET study

2013

Purpose: To describe the distribution of intraocular pressure (IOP) and central corneal thickness (CCT) in an old French population. Methods: About 9000 individuals 65 years and older were included in the 3C cohort study since 1999 in 3 French cities (Bordeaux, Dijon and Montpellier). In Dijon, an additional ophthalmic examination was performed 10 years after the initial inclusions to assess the relation between systemic age-related diseases and eye diseases in the MONTRACHET Study (Maculopathy Optic Nerve nuTRition neurovAsCular and HEarT diseases). In this population-based stuy a thorough eye examination and a questionnaire were undertaken in each participant. Intraocular pressure (IOP) w…

Modulation of brain PUFA content in different experimental models of mice.

2016

International audience; The relative amounts of arachidonic acid (AA) and docosahexaenoic acid (DHA) govern the different functions of the brain. Their brain levels depend on structures considered, on fatty acid dietary supply and the age of animals. To have a better overview of the different models available in the literature we here compared the brain fatty acid composition in various mice models (C57BL/6J, CD1, Fat-1, SAMP8 mice) fed with different n-3 PUFA diets (deficient, balanced, enriched) in adults and aged animals. Our results demonstrated that brain AA and DHA content is 1) structure-dependent; 2) strain-specific; 3) differently affected by dietary approaches when compared to gen…

Proteomic analysis of sub-retinal deposits in age-related macular degeneration

2014

National audience

Combined effects of aging and a pro-diabetic diet on retinal function in a murine model of aging of the human eye

2009

 ; Purpose: Improvement of life expectancy and changes in the dietary behaviour of developed populations are accompanied with the prevalence of diabetes and age-related ocular pathologies. Aging of the retina is characterized by accumulation of lipids at the basement of the retinal pigment epithelium - Bruch’s membrane complex.Meanwhile increased oxidative stress is one of the features of aging and diabetes. A fructose-rich diet induces insulin resistance and hypertriglyceridemia, mimicking diabetes. The goal of our study was to evaluate the effects of a pro-diabetic fructose-enriched diet on the retinal function of the ApoB100,LDLR-/- mice, a murine model of aging of the human eye. Methods…

O32 Le syndrome métabolique induit par un régime enrichi en fructose est promoteur d’un développement néovasculaire et d’altérations fonctionnelles d…

2013

Lipid composition of the human eye: are red blood cells a good mirror of retinal and optic nerve fatty acids?

2011

International audience; BACKGROUND: The assessment of blood lipids is very frequent in clinical research as it is assumed to reflect the lipid composition of peripheral tissues. Even well accepted such relationships have never been clearly established. This is particularly true in ophthalmology where the use of blood lipids has become very common following recent data linking lipid intake to ocular health and disease. In the present study, we wanted to determine in humans whether a lipidomic approach based on red blood cells could reveal associations between circulating and tissue lipid profiles. To check if the analytical sensitivity may be of importance in such analyses, we have used a do…

Dietary polyunsaturated fatty acids reduce retinal stress induced by an elevation of intraocular pressure in rats.

2011

International audience; N-6 and n-3 polyunsaturated fatty acids (PUFAs) have been shown to prevent tissue release of inflammatory molecules. We have shown that a combination of n-6 and n-3 PUFAs is more efficient than single supplementations on the long-term consequences of intraocular pressure elevation. We hypothesized that such an association is also more effective during early retinal stress by modifying retinal proinflammatory prostaglandin and cytokine productions. Rats were supplemented for 3 months with n-6 PUFAs, n-3 PUFAs, or both n-6 and n-3 PUFAs. After 3 months, a surgical elevation of intraocular pressure was induced. Retinal morphometry and glial cell activation were evaluate…

Identification and quantification of phosphatidylcholines containing very-long-chain polyunsaturated fatty acid in bovine and human retina using liqu…

2010

The retina is one of the vertebrate tissues with the highest content in polyunsaturated fatty acids (PUFA). A large proportion of retinal phospholipids, especially those found in photoreceptor membranes, are dipolyunsaturated molecular species. Among them, dipolyunsaturated phosphatidylcholine (PC) molecular species are known to contain very-long-chain polyunsaturated fatty acids (VLC-PUFA) from the n-3 and n-6 series having 24-36 carbon atoms (C24-C36) and four to six double bonds. Recent interest in the role played by VLC-PUFA arose from the findings that a protein called elongation of very-long-chain fatty acids 4 (ELOVL4) is involved in their biosynthesis and that mutations in the ELOVL…

Incorporation of lutein and docosahexaenoic acid from dietary microalgae into the retina in quail

2015

Abstract Lutein and docosahexaenoic acid (DHA) are associated with the prevention of age-related macular degeneration (AMD). Since microalgae are potent natural sources of these nutrients, their nutritional value should be evaluated based on the bioavailability of lutein and DHA for the retina via the plasmatic compartment. In this study, quail were fed for 5 months either with a diet supplemented or deprived with microalgae rich in lutein and DHA. In the microalgae-fed group, the retinal concentrations of lutein and zeaxanthin gradually increased whereas in plasma, these compounds started to increase from the first month of supplementation. We also observed a significant increase in retina…

24S-hydroxycholesterol and cholesterol-24S-hydroxylase (CYP46A1) in the retina: from cholesterol homeostasis to pathophysiology of glaucoma.

2011

http://www.sciencedirect.com/; International audience; Free cholesterol is the predominant form of cholesterol in the neural retina. The vertebrate neural retina exhibits its own capacity to synthesize cholesterol and meets its demand also by taking it from the circulation. Defects in cholesterol synthesis and trafficking in the neural retina has detrimental consequences on its structure and function, highlighting the crucial importance of maintaining cholesterol homeostasis in the retina. Our purpose was to give a review on the functioning of the retina, the role of cholesterol and cholesterol metabolism therein, with special emphasis on cholesterol-24S-hydroxylase (CYP46A1). Similar to th…

Profile of Fatty Acids, Tocopherols, Phytosterols and Polyphenols in Mediterranean Oils (Argan Oils, Olive Oils, Milk Thistle Seed Oils and Nigella S…

2019

Background: The effects of vegetable oils on human health depend on their components. Therefore, their profiles of lipid nutrients and polyphenols were determined. Objective: To establish and compare the fatty acid, tocopherol, phytosterol and polyphenol profiles of Mediterranean oils: cosmetic and dietary argan oils (AO; Morocco: Agadir, Berkane); olive oils (OO; Morocco, Spain, Tunisia); milk thistle seed oils (MTSO; Tunisia: Bizerte, Sousse, Zaghouane); nigella seed oil (NSO). Methods: The biochemical profiles were determined by gas chromatography-flame ionization, high performance liquid chromatography and gas chromatography, coupled with mass spectrometry as required. The antioxidant …

The ins and outs of cholesterol in the vertebrate retina

2010

Thematic Review Series: Lipids and Lipid Metabolism in the Eye; International audience; The vertebrate retina has multiple demands for utilization of cholesterol and must meet those demands either by synthesizing its own supply of cholesterol or by importing cholesterol from extraretinal sources, or both. Unlike the blood-brain barrier, the blood-retina barrier allows uptake of cholesterol from the circulation via a lipoprotein-based/receptor-mediated mechanism. Under normal conditions, cholesterol homeostasis is tightly regulated; also, cholesterol exists in the neural retina overwhelmingly in unesterified form, and sterol intermediates are present in minimal to negligible quantities. Howe…

Docosahexaenoic acid protects human RPE cells against oxidative stress via PI3K/Akt m-TOR/p70-p85S6K pathways

2012

Purpose Oxidative Stress (OS) plays a critical role in the pathogenesis of age-related macular degeneration (AMD), especially by targeting the retinal pigment epithelium (RPE). Dietary habits with high consumption of docosahexaenoic acid (DHA) have been shown to prevent the development and evolution of AMD. Nevertheless, it is still unclear how DHA affects AMD. Our study aimed to investigate the involvement of the PI3K/Akt and m-TOR/p70-p85S6K pathways in human RPE cells after induction of OS, and then to assess the effect of DHA in the signaling pathways and in the protection against RPE cell death. Methods For this purpose, we used ARPE-19 cells exposed to the prooxidant agent, tert-butyl…

Perinatal high-fat diet increases hippocampal vulnerability to the adverse effects of subsequent high-fat feeding

2015

Epidemiological observations report an increase in fat consumption associated with low intake of n-3 relative to n-6 polyunsaturated fatty acids (PUFAs) in women of childbearing age. However, the impact of these maternal feeding habits on cognitive function in the offspring is unknown. This study aims to investigate the impact of early exposure to a high-fat diet (HFD) with an unbalanced n-6/n-3 PUFAs ratio on hippocampal function in adult rats. Furthermore, we explored the effects of perinatal HFD combined with exposure to HFD after weaning. Dams were fed a control diet (C, 12% of energy from lipids, n-6/n-3 PUFAs ratio: 5) or HFD (HF, 39% of energy from lipids, n-6/n-3 PUFAs ratio: 39) th…

Ocular surface assessment in soft contact lens wearers; the contribution of tear osmolarity among other tests.

2014

: Purpose:  To determine whether tear osmolarity contributes to the assessment of the ocular surface in soft contact lens (CL) wearers. Methods:  Prospective, case–control series in 44 CL wearers (28 tolerant and 16 intolerant) and 34 healthy subjects. Every patient underwent a thorough ophthalmic examination with a tear osmolarity test (TearLab System), conjunctival impression cytology and meibomian lipid sampling. Symptoms, break-up time (BUT), tear osmolarity, conjunctival expression of HLA-DR and meibomian fatty acid composition were evaluated. Results:  Tear osmolarity did not differ between controls and CL wearers (p = 0.23). Flow cytometry results expressed in antibody-binding capaci…

Steady-state levels of retinal 24S-hydroxycholesterol are maintained by glial cells intervention after elevation of intraocular pressure in the rat

2012

Purpose: Our previous studies suggested that CYP46A1 and 24S-hydroxycholesterol. (24SOH) may be associated with glaucoma. Loss of CYP46A1-expressing retinal. ganglion cells is involved in the activation of glia, and therefore possibly in the. disbalance of cholesterol. In this context, the purpose of our present work was to. emphasize the glial and longitudinal CYP46A1 expression after an interventional. glaucoma-related stress triggered by elevated intraocular pressure (IOP). Methods: Sprague–Dawley rats were submitted to laser photocoagulation of the. trabecular meshwork, limbus and episcleral veins in one eye to induce elevated IOP. Rats were euthanized at days 3, 14, 30 and 60 (n = 10 p…

Oxidation-Induced Increase In Photoreactivity of Bovine Retinal Lipid Extract

2017

Open access original paper Source : 10th EPR Workshop on Applications of EPR in Biology and Medicine, 2016 in Krakow, POLAND.; International audience; The mammalian retina contains a high level of polyunsaturated fatty acids, including docosahexaenoic acid (22:6) (DHA), which are highly susceptible to oxidation. It has been shown that one of the products of DHA oxidation-carboxyethylpyrrole (CEP), generated in situ, causes modifications of retinal proteins and induces inflammation response in the outer retina. These contributing factors may play a role in the development of age-related macular degeneration (AMD). It is also possible that some of the lipid oxidation products are photoreactiv…

Plasma gangliosides and age-related macular degeneration

2013

Purpose Age-related macular degeneration (AMD) is a multifactorial and polygenic disease and is the main cause of vision loss in developed countries after 50 years old. Indeed, dry AMD leads to progressive retinal atrophy and exsudative AMD induces a rapid alteration of the macula through neovascularisation. Gangliosides (GG) make a wide and heterogeneous family of sialic-acid-containing glycosphingolipids, composed of a sugar chain branched on a ceramide. They are major components of cellular membranes and are particularly abundant in the brain and nervous tissue, including retina. They are also found circulating in the plasma. GG are known for their neuroprotective properties in the nervo…

Involvement of plasmalogens and iPLA2 in the control of post-natal retinal vascular development in the mouse

2013

Involvement of plasmalogens and iPLA2 in the control of post-natal retinal vascular development in the mouse. 16. GEM - 10. GERLI lipidomics meeting: from membranes to pathologies

Plasmalogens in the regulation of retinal vascular development: design of a mouse model with chemical inhibition of IPLA2

2011

Plasmalogens in the regulation of retinal vascular development: design of a mouse model with chemical inhibition of IPLA2. annual meeting of the association-for-research-in-vision-and-ophthalmology (ARVO)

Qualiment: the scientifist expertise to promote innovation in food companies

2011

Cholestérol et pathologies oculaires

2014

Acides gras polyinsaturés de la rétine : ont-ils une origine alimentaire ? Lipid Nutri+

2010

Article publié par l'Organisation nationale interprofessionnelle des graines et fruits oléagineux (Paris, France)

Cholesterol metabolism via cyp46a1 in glaucoma

2012

Cholesterol metabolism via cyp46a1 in glaucoma. International society for eye research (ISER) annual meeting

Circulating plasmalogens in patients with primary open angle glaucoma

2011

Purpose: Neuronal tissues such as the retina contain high amounts of particular phospholipids named “ether-lipids”. Since abnormal blood levels of ether-lipids have been associated with several neurological disorders, we wanted to check whether ether-lipid levels were modified and associated with the severity of POAG. Methods: Blood samples were collected from 41 healthy subjects and 64 POAG patients. Following lipid extraction from erythrocytes, total phospholipids including ether-lipids were isolated using silica cartridges. The fatty acid profile of phospholipids was determined using capillary column gas chromatography (GC). The individual molecular species of phospholipids and ether-lip…

Involvement of plasmalogens and polyunsaturated fatty acids in the pathogenesis of glaucoma

2013

Plasmalogens, polyunsaturated fatty acids (PUFA), and glaucoma

2012

In vivo consequences of cholesterol-24s-hydroxylase (CYP46A1) inhibition by voriconazole on cholesterol homeostasis and function in the rat retina

2011

Cholesterol 24S-hydroxylase (CYP46A1) converts cholesterol into 24S-hydroxycholesterol in neurons and participates in cholesterol homeostasis in the central nervous system, including the retina. We aimed to evaluate the consequences of CYP46A1 inhibition by voriconazole on cholesterol homeostasis and function in the retina. Rats received daily intraperitoneal injections of voriconazole (60mg/kg), minocycline (22mg/kg), voriconazole plus minocycline, or vehicle during five consecutive days. The rats were submitted to electroretinography to monitor retinal functionality. Cholesterol and 24S-hydroxycholesterol were measured in plasma, brain and retina by gas chromatography-mass spectrometry. T…

Circulating markers of retinal and optic nerve lipids

2013

Purpose Blood lipids are frequently used as a surrogate of lipid composition of peripheral tissues. Even if it is well accepted, such a relationship has never been clearly demonstrated for the eye. The aim of this study was to determine in human samples whether a lipidomic approach based on red blood cells could reveal associations between circulating and ocular lipid profiles. Methods Red blood cells, retinas and optic nerves were collected from 9 human donors. The lipidomic analyses on these tissues were done by both, gas chromatography and liquid chromatography coupled to an electrospray ionization source-mass spectrometer (LC-ESI-MS/MS). Results Gas chromatographic approach did not show…

Plasmalogens, erythrocyte deformability, and retinal vascular development

2014

Polyunsaturated fatty acids and plasmalogens in diabetics

2013

PurposePlasmalogens are phospholipids characterized by a vinyl ether bond and a preferential esterification of polyunsaturated fatty acids (PUFA). We have previously shown that the lack of plasmalogens leads to retinal hyper-capillarization. We hypothesize that plasmalogens are negative regulators of vascular development, and aimed to check their circulating levels in diabetic patients with a retinopathy. MethodsBlood samples were collected from 88 patients and 14 control subjects. Among diabetics we had 14 patients without diabetic retinopathy (DR), 12 with a mild non proliferative DR, 12 with a moderate non proliferative DR, 22 with a severe non proliferative DR and 24 with a proliferativ…

Decreasing the dietary intake of linoleic acid promotes the efficacy of dietary long chain omega-3 fatty acids to incorporate the rat retina and modi…

2011

Decreasing the dietary intake of linoleic acid promotes the efficacy of dietary long chain omega-3 fatty acids to incorporate the rat retina and modifies gene expression. annual meeting of the association-for-research-in-vision-and-ophthalmology (ARVO)

Carotenoids under the spotlight: from diet to the retina

2016

Revue; Carotenoids under the spotlight: from diet to the retina. 12. congress of the international society for the study of fatty acids and lipids

Characterization of plasmalogens in retinal glial cells

2015

Purpose: Plasmalogens (or ether-lipids) constitute a particular class of glycerophospholipids that are characterized by the presence of a vinyl-ether bond at the sn-1 position of the glycerol backbone and by the preferential esterification of polyunsaturated fatty acids (PUFAs) at the sn-2 position. Although their exact functions remain enigmatic, previous data from our laboratory suggest that plasmalogens play crucial functions during retinal vessel development by affecting astrocyte template formation (Saab et al PLoSONE 2014;9(6):e101076). The aim of this study was to better characterize plasmalogens in the retina and to determine which cells are responsible for plasmalogens production w…

4812 - A0028 Gangliosides in the retina: a comparative inventory with brain and other ocular structures

2016

Purpose: Gangliosides (GG) make an extremely diverse family of glycosphingolipids particularly abundant in the brain and neural tissues. While it is known that alterations in GG metabolism are associated with visual defects, the precise biological roles of these compounds in the retina are still largely unknown. In this context, we performed an exhaustive inventory and thorough characterization of the human eye GG aiming to reveal specificities and common features of the retina compared to other ocular tissues and brain.Methods: Retina, RPE/Choroid, ciliary body, optic nerve and brain samples were collected from deceased human donors (N=7). GG were extracted and analysed by a comprehensive …

Implication of 24-S-hydroxycholesterol in Muller glial cell's membrane dynamics in the rat.

2016

Implication of 24-S-hydroxycholesterol in Muller glial cell's membrane dynamics in the rat.. Association-for-Research-in-Vision-and-Ophthalmology (ARVO)

Plasmalogen levels are reduced in erythrocytes from patients with diabetic retinopathy

2011

Plasmalogen levels are reduced in erythrocytes from patients with diabetic retinopathy. annual meeting of the association-for-research-in-vision-and-ophthalmology (ARVO)

Loss of rod sensitivity and gene expression changes in the retina of fructose-fed insulin-resistant mice

2012

Purpose: Metabolic syndrome is of major concern in Western countries since it predisposes individuals to the development of diabetes. Insulin resistance is one of the biochemical features of the metabolic syndrome. Fructose feeding has been used to elicit insulin resistance in rodents. Our purpose was to characterize the functional and gene expression changes in the retina after long term feeding mice with a fructose-enriched diet.Methods: Control and ApoB100,LDLR-/- mice, a murine model of aging of the human retina, were fed with a 60%-rich fructose diet for 8 months. Scotopic single flash and Flicker electroretinograms were recorded to monitor the response of the retina to flash stimuli. …

Quantitative analysis of fatty acids on choline- and ethanolamine-phospholipids in human ocular and non-ocular tissues by liquid chromatography/tande…

2011

Quantitative analysis of fatty acids on choline- and ethanolamine-phospholipids in human ocular and non-ocular tissues by liquid chromatography/tandem mass spectrometry (LC-ESI-MS/MS). annual meeting of the association-for-research-in-vision-and-ophthalmology (ARVO)