<prompt> All of the following take pa in the pathogenesis of macular edema in diabetic retinopathy except -Retinal pigment epithelium dysfunctionOxidative stressVEGFIncreased protein kinase-C  <response>: In diabetic Retinopathy, the pathogenesis of macular edema undeegoes: Oxidation VEGF Increased protein kinase C Ref khurana 6e p 279 