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Published on: July 14, 2016
Keypathophysiologic pathways in age-related macular disease
Felix Roth1, Almut Bindewald, Frank G Holz
1Department of Ophthalmology, University of Bonn, Ernst-Abbestrasse 2, 53127 Bonn, Germany.
Purpose:
To review current knowledge of key pathogenetic pathways in age-related macular disease (AMD).
Methods:
Experimental evidence and clinical observations are reviewed.
Results:
A number of common downstream pathophysiologic pathways appear to be relevant in AMD manifestations irrespective of primary heterogeneous etiologies. These include sequelae of oxidative damage, retinal pigment epithelium (RPE) cell dysfunction with accumulation of lipofuscin and impairment of lysosomal functions, deposition of subsequently incompletely degraded material at the basal RPE cell side and alterations in Bruch's membrane extracellular matrix, immunologic responses to extracellular material (drusen) with subsequent growth of drusen, induction of choroidal neovascularization as a result of imbalance between anti-angiogenetic and proangiogenetic factors as well as cell death (geographic atrophy) without prior neovascular events.
Conclusions:
Understanding is expanding regarding the sequence of events that lead to early and late lesions in AMD. Therapeutic approaches that focus on the molecular mechanisms are more likely to succeed than currently available treatment options as exemplified by the management of choroidal neovascularisations.
Insights
Age-related macular disease (AMD) involves common pathways like oxidative damage and retinal pigment epithelium dysfunction. Targeting these molecular mechanisms offers promising therapeutic strategies for AMD, surpassing current treatments.
Area of Science:
- Ophthalmology
- Pathophysiology
- Molecular Biology
Background:
- Age-related macular disease (AMD) is a leading cause of vision loss.
- Understanding the complex molecular mechanisms underlying AMD is crucial for developing effective treatments.
Purpose of the Study:
- To review current knowledge on the key pathogenetic pathways involved in age-related macular disease (AMD).
Main Methods:
- Review of experimental evidence.
- Analysis of clinical observations.
Main Results:
- Common downstream pathways in AMD include oxidative damage, retinal pigment epithelium (RPE) dysfunction, lipofuscin accumulation, and impaired lysosomal function.
- Pathological processes involve extracellular matrix alterations in Bruch's membrane, drusen formation, choroidal neovascularization due to angiogenic imbalance, and geographic atrophy.
Conclusions:
- Knowledge of AMD pathogenesis is advancing, clarifying the sequence of events leading to early and late lesions.
- Therapeutic strategies targeting molecular mechanisms show greater promise than current treatments, as seen in managing choroidal neovascularization.
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