title: Expression of pigment epithelium-derived factor and thrombospondin-1 regulate proliferation and migration of retinal pigment epithelial cells.
abstract: Age-related macular degeneration (AMD) is the leading cause of vision loss among elderly. Although the pathogenesis of AMD is associated with retinal pigmented epithelium (RPE) dysfunction and abnormal neovascularization the detailed mechanisms remain unresolved. RPE is a specialized monolayer of epithelial cells with important functions in ocular homeostasis. Pathological RPE damage contributes to major ocular conditions including retinal degeneration and irreversible loss of vision in AMD. RPE cells also assist in the maintenance of the ocular angiogenic balance by production of positive and negative regulatory factors including vascular endothelial growth factor (VEGF), thrombospondin-1 (TSP1), and pigment epithelium-derived factor (PEDF). The altered production of PEDF and TSP1, as endogenous inhibitors of angiogenesis and inflammation, by RPE cells have been linked to pathogenesis of AMD and choroidal and retinal neovascularization. However, lack of simple methods for isolation and culture of mouse RPE cells has resulted in limited knowledge regarding the cell autonomous role of TSP1 and PEDF in RPE cell function. Here, we describe a method for routine isolation and propagation of RPE cells from wild-type, TSP1, and PEDF-deficient mice, and have investigated their impact on RPE cell function. We showed that expression of TSP1 and PEDF significantly impacted RPE cell proliferation, migration, adhesion, oxidative state, and phagocytic activity with minimal effect on their basal rate of apoptosis. Together, our results indicated that the expression of PEDF and TSP1 by RPE cells play crucial roles not only in regulation of ocular vascular homeostasis but also have significant impact on their cellular function.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Clinical Investigation Graduate Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: Mitra
authors.initials: M
authors.lastname: Farnoodian
authors.affiliation: Department of Ophthalmology and Visual Sciences, Clinical Investigation Graduate Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: James B
authors.initials: JB
authors.lastname: Kinter
authors.affiliation: Department of Ophthalmology and Visual Sciences, Clinical Investigation Graduate Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: Saeed
authors.initials: S
authors.lastname: Yadranji Aghdam
authors.affiliation: Department of Ophthalmology and Visual Sciences, Clinical Investigation Graduate Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: Ismail
authors.initials: I
authors.lastname: Zaitoun
authors.affiliation: Department of Pediatrics, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin McPherson Eye Research Institute, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Sorenson
authors.affiliation: Department of Ophthalmology and Visual Sciences, Clinical Investigation Graduate Program, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin McPherson Eye Research Institute, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin Department of Biomedical Engineering, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin.
authors.forename: Nader
authors.initials: N
authors.lastname: Sheibani
keywords: Adhesion; RPE cells; cell proliferation; migration; oxidative stress