Age-related macular degeneration (AMD) affects 2 million people in France. It characterized by progressive degeneration of the central area of the retina allowing detailed vision. It is the main cause of irreversible blindness in France. All patients initially present an early form, the latter can evolve in two different ways: the atrophic form, which progresses slowly, and the exudative or neovascular form, of more rapid evolution. While the treatment of exudative AMD has improved dramatically in recent years, there is currently no therapy for atrophic AMD. Recently, it has been demonstrated in atrophic AMD, an accumulation of inflammatory cells, macrophages, in the sub-retinal space. This space is located between the pigment epithelium (PE) and the photoreceptors. It is physiologically devoid of immune cells (immune privilege). Macrophages will secrete many pro-inflammatory molecules, such as cytokines. It has been shown in mouse models that some cytokines (IL-1beta, IL6 et TNFalpha) have a deleterious role on (PE) and photoreceptors. The identification of specific cytokines in the aqueous humor of patients with atrophic AMD would help to better understand this disease and consider potential targeted therapies. This study will be conducted in the ophthalmology department of the Croix-Rousse Hospital in Lyon. 80 patients will be recruited and divided into 4 groups: three experimental groups of 20 patients with : Early / Intermediate AMD, atrophic AMD or exudative AMD, and one control group of 20 patients without signs of AMD. Assays of the markers will be performed using the Luminex® technique on aqueous humor and blood samples collected for all patients during cataract surgery. The concentrations obtained in the aqueous humor will be normalized on their respective blood levels in order to confirm the intraocular secretion of these markers,. The identification of particular cytokine profiles in atrophic AMD compared to other forms of AMD would support emerging hypotheses of involvement of specific inflammatory cells in this pathology. There is currently no treatment available for atrophic AMD. If molecular screening identifies one or more specific biomarkers, targeted therapy may be considered.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
HEALTH_SERVICES_RESEARCH
Masking
NONE
Enrollment
82
The blood sample will be centrifuged. The plasma will be recovered. Plasma and aqueous humor will be frozen and stored at -80° Celsius. The search of 27 markers of inflammation will be performed by the kit LUMINEX Bio-rad (Bio-Rad, M500KCAF0Y).
Hôpital de la Croix-Rousse
Lyon, France
Comparison of concentrations of intraocular inflammation markers between the group of patients with atrophic AMD and the control group.
Aqueous humor sample will be collected during the cataract surgery in patient with atrophic AMD and in patient of control group. In order to identify and quantify intraocular inflammation markers in samples, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). This test allow identification of one or more of the following 27 inflammation markers: basic FGF, Eotaxin, G-CSF, GM-CSF, interferon (IFNγ), interleukin (IL1β, IL1ra, IL2, IL4, IL5, IL6, IL7, IL8, IL9, IL10, IL12, IL13 , IL15, IL17), IP10, MCP1, MIP1α, MIP1β, PDGF-BB, RANTES, TNFα and Vascular Endothelial Growth Factor (VEGF).
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] between the group of patients with atrophic AMD and the control group.
Aqueous humor sample and the blood sample will be collected during the cataract surgery in patient with atrophic AMD and in patient of control group. In order to identify and quantify inflammation markers, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). For each identified intraocular inflammatory marker, the ratio between the level of expression in the aqueous humor sample and the level of expression in the blood sample will be calculated. Each ratio will be compared between patients with atrophic AMD and patients of control group.
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] between the different stages of AMD: early / intermediate, exudative or atrophic
Aqueous humor sample and the blood sample will be collected during the cataract surgery in patient with different stage of AMD : early / intermediate, exudative or atrophic. In order to identify and quantify inflammation markers, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). For each identified intraocular inflammatory marker, the ratio between the level of expression in the aqueous humor sample and the level of expression in the blood sample will be calculated and compared between different stages of AMD: early / intermediate, exudative or atrophic.
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] between the different types of atrophic AMD defined by autofluorescence exam (non-hyperautofluorescent or hyperautofluorescent form)
Autofluorescence exam allows in vivo mapping of lipofuscin distribution. Lipofuscin is a fluorophore of the retinal pigment epithelium. Autofluorescence represents in gray scale the spatial distribution of lipofuscin, and reflect the metabolic activity of the retinal pigment epithelium. Autofluorescence exam allows classification in different types of atrophic AMD. Autofluorescence exam was performed for all patients at the first visit. Aqueous humor sample and blood sample will be collected during the cataract surgery. In order to identify and quantify inflammation markers, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). For each identified intraocular inflammatory marker, the ratio between the level of expression in the aqueous humor sample and the level of expression in the blood sample will be calculated, and compared between the different types of atrophic AMD.
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] according to the macular atrophy area measured by autofluorescence in atrophic AMD.
Macular atrophy area is measured at first visit in autofluorescent exam. Aqueous humor sample and the blood sample will be collected during the cataract surgery. In order to identify and quantify inflammation markers, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). For each identified intraocular inflammatory marker, the ratio between the level of expression in the aqueous humor sample and the level of expression in the blood sample will be calculated, and compared between the different size of macular atrophy area.
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] according to the central retinal thickness measured by Optical Coherence Tomography (OCT) in atrophic AMD
OCT define precisely the retinal structures and their locations. Aqueous humor sample and the blood sample will be collected during the cataract surgery. In order to identify and quantify inflammation markers, LUMINEX® Multiplex analysis of the samples will be done by the Bio-Plex Pro Human Cytokine 27-Plex Panel (Bio-Rad, M500KCAF0Y). For each identified intraocular inflammatory marker, the ratio between the level of expression in the aqueous humor sample and the level of expression in the blood sample will be calculated, and compared between the different thickness of retina measured by OCT .
Time frame: day of surgery
Comparison of the concentration ratios of inflammation marker [aqueous humor / blood] according to the recognized risk factors of AMD
ratios of \[aqueous humor / blood\] concentrations of inflammation markers will be compared on age, female sex, smoking (number of pack-years), obesity (body mass index)
Time frame: day of surgery
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