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Discover 17,842 clinical trials near Baltimore, Maryland. Find research studies in your area.
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NCT05038371
Age-related macular degeneration (AMD) remains a leading cause of blindness in United States and can be broadly divided into two forms: non-neovascular AMD (NNVAMD) and neovascular AMD (NVAMD) AMD. Among the several mechanisms underlying AMD, hypoxia and oxidative stress have been implicated and cause upregulation of several signaling proteins. About 20% of patients with NNVAMD develop choroidal neovascularization and hence convert to NVAMD. Upregulation of vascular endothelial growth factor (VEGF) plays a critical role in conversion from NNVAMD to NVAMD. Connective tissue growth factor (CTGF) is a polypeptide that has been shown to be overexpressed in various fibrotic disorders, suggesting its involvement in scarring. After the development of choroidal neovascularization, subretinal fibrosis may occur and result in permanent reduction of vision. An important question is, does CTGF contribute to subretinal fibrosis. An important first step in addressing this question is to determine if CTGF levels are increased in the eyes of patients with NVAMD and this is the objective of this study. The investigators plan to measure levels of connective tissue growth factor (CTGF) in the aqueous humor of patients with neovascular age-related macular degeneration and compare to controls. Levels of VEGF will be measured as a positive control.
NCT01851434
Background: \- Optic neuritis often is a symptom of multiple sclerosis (MS). Many people who experience optic neuritis are later diagnosed with MS. MS disease activity seen on magnetic resonance imaging (MRI) scans is often greater than that seen in tests given during regular doctor's visits. Even though MRI is a helpful tool for studying optic neuritis and MS, more information is needed on how MS symptoms show up on MRI scans. Researchers want to use MRI scans to track changes in the optic nerve after an optic neuritis episode. This approach will help them study the relationship between optic neuritis and MS. Objectives: \- To collect more information about the relationship between optic neuritis and multiple sclerosis. Eligibility: * Individuals between 18 and 50 years of age who have new optic neuritis. * Individuals between 18 and 50 years of age who have new symptoms of MS other than optic neuritis. * Healthy volunteers between 18 and 50 years of age. Design: * Participants will be screened with a physical exam and medical history. They may provide blood or urine samples. * Participants with optic neuritis or other MS symptoms will have a baseline study visit. They will have a physical exam and full eye exam. To look for signs of MS, they will have evoked potential tests to see how the body responds to stimulation. They will also have an MRI scan to study any changes in the brain and optic nerves. * After the first visit, participants will have steroid treatment for 5 days for the optic neuritis. * Additional study visits will be given 1, 3, 6, 9, and 12 months after the baseline visit. The tests from the first visit, including the MRI scans, will be repeated at these visits. * Healthy volunteers will have a baseline study visit. They will have a physical exam and full eye exam. They will have evoked potential tests to see how the body responds to stimulation. They will also have an MRI scan to study any changes in the brain and optic nerves. * Healthy volunteers will have additional study visits 2 and 11 months after the baseline visit. The tests from the first visit, including the MRI scans, will be repeated at these visits.