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The pathogenesis of choroidal neovascularization in patients with age-related macular degeneration
P A Campochiaro1, P Soloway, S J Ryan
1The Departments of Ophthalmology and Neuroscience,The Johns Hopkins University School of Medicine, Baltimore, MD 21287-9277, USA. pcampo@jhmi.edu
Abstract:
Laser photocoagulation and several experimental treatments for choroidal neovascularization (CNV) in patients with age-related macular degeneration attempt to ablate the neovascularization, but do not address underlying angiogenic stimuli. As a result, recurrences are a major problem. Drug treatment to counter the growth of CNV would be a major advance, but its development is impeded by lack of knowledge concerning the stimuli and other molecular signals involved in the pathogenesis of CNV. Herein we explore clues that can be gleaned from clinical, epidemiological, pathological, and experimental data. These suggest that abnormalities of the extracellular matrix of retinal pigmented epithelial (RPE) cells may promote a pro-angiogenic RPE phenotype that contributes to the development of CNV. This provides a general hypothesis that can be tested, but it is also necessary to test hypotheses regarding the specific alterations in gene expression that contribute to CNV. Identification of alterations in gene expression will provide targets for rational design of drug treatment.
Insights
Current treatments for choroidal neovascularization (CNV) fail to prevent recurrence because they ignore angiogenic stimuli. Understanding extracellular matrix and gene expression changes in retinal pigmented epithelial (RPE) cells may reveal targets for new drug treatments.
Area of Science:
- Ophthalmology
- Molecular Biology
- Pathogenesis of Disease
Background:
- Choroidal neovascularization (CNV) is a hallmark of age-related macular degeneration.
- Current treatments like laser photocoagulation aim to ablate neovascularization but do not address the root causes, leading to high recurrence rates.
- Developing effective drug treatments for CNV is hindered by incomplete knowledge of the molecular signals driving its pathogenesis.
Purpose of the Study:
- To explore potential molecular targets for drug development in treating choroidal neovascularization (CNV).
- To investigate the role of extracellular matrix abnormalities and gene expression in retinal pigmented epithelial (RPE) cells in CNV development.
- To propose a general hypothesis linking RPE cell extracellular matrix to a pro-angiogenic phenotype contributing to CNV.
Main Methods:
- Review and synthesis of clinical, epidemiological, pathological, and experimental data.
- Exploration of extracellular matrix alterations in retinal pigmented epithelial (RPE) cells.
- Investigation of gene expression patterns associated with CNV pathogenesis.
Main Results:
- Clinical and experimental data suggest that abnormalities in the extracellular matrix of RPE cells may promote a pro-angiogenic phenotype.
- This pro-angiogenic RPE phenotype is hypothesized to contribute significantly to the development of CNV.
- Specific alterations in gene expression are implicated in the pathogenesis of CNV.
Conclusions:
- Abnormalities in RPE extracellular matrix and specific gene expression changes are key factors in CNV development.
- Identifying these molecular alterations provides a basis for developing targeted drug therapies.
- This research opens avenues for rational drug design to combat recurrent choroidal neovascularization.