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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Pathol 2014 ; 184 (10): 2709-20 Nephropedia Template TP
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Peroxisome Proliferator?Activated Receptor ? Protects Capillary Pericytes in the Retina #MMPMID25108226
Am J Pathol 2014[Oct]; 184 (10): 2709-20 PMID25108226show ga
Pericyte degeneration is an early event in diabetic retinopathy and plays an important role in progression of diabetic retinopathy. Clinical studies have shown that fenofibrate, a peroxisome proliferator?activated receptor ? (PPAR?) agonist, has robust therapeutic effects on diabetic retinopathy in type 2 diabetic patients. We evaluated the protective effect of PPAR? against pericyte loss in diabetic retinopathy. In streptozotocin-induced diabetic mice, fenofibrate treatment significantly ameliorated retinal acellular capillary formation and pericyte loss. In contrast, PPAR??/? mice with diabetes developed more severe retinal acellular capillary formation and pericyte dropout, compared with diabetic wild-type mice. Furthermore, PPAR? knockout abolished the protective effect of fenofibrate against diabetes-induced retinal pericyte loss. In cultured primary human retinal capillary pericytes, activation and expression of PPAR? both significantly reduced oxidative stress?induced apoptosis, decreased reactive oxygen species production, and down-regulated NAD(P)H oxidase 4 expression through blockade of NF-?B activation. Furthermore, activation and expression of PPAR? both attenuated the oxidant-induced suppression of mitochondrial O2 consumption in human retinal capillary pericytes. Primary retinal pericytes from PPAR??/? mice displayed more apoptosis, compared with those from wild-type mice under the same oxidative stress. These findings identified a protective effect of PPAR? on retinal pericytes, a novel function of endogenous PPAR? in the retina.