Oxidized low density lipoprotein-induced senescence of retinal pigment epithelial cells is followed by outer blood-retinal barrier dysfunction

The International Journal of Biochemistry & Cell Biology
Jin Hyoung KimJeong Hun Kim

Abstract

Age-related macular degeneration is the most common cause of vision loss in the elderly, which starts from aging processes of retinal pigment epithelial cells. Among variable risk factors in occurrence and progression of age-related macular degeneration, oxidized low density lipoprotein could be causally involved in pathobiological changes of RPE cells. Herein we showed that oxidized low density lipoprotein-induced senescence of retinal pigment epithelial cells is followed by outer blood-retinal barrier dysfunction. Under sub-lethal concentration, oxidized low density lipoprotein could promote advanced senescence of retinal pigment epithelial cells. Interestingly expression of CRALBP and RPE 65, indicators of retinal pigment epithelial cell differentiation, was decreased by oxidized low density lipoprotein. In addition, oxidized low density lipoprotein induced reactive oxygen species production and up-regulated inflammatory factors such as tumor necrosis factor-α and vascular endothelial growth factor, when β-catenin, a critical mediator of the canonical Wnt pathway, was also elevated. Oxidized low density lipoprotein increased paracellular permeability of retinal pigment epithelial cells, when zonula occludens-1 at intercellul...Continue Reading

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