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Nutrients 2016, 8(12), 782; doi:10.3390/nu8120782

Dietary Compound Chrysin Inhibits Retinal Neovascularization with Abnormal Capillaries in db/db Mice

Department of Food Science and Nutrition, Hallym University, Chuncheon 24252, Korea
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Received: 18 October 2016 / Revised: 23 November 2016 / Accepted: 28 November 2016 / Published: 3 December 2016
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Abstract

Diabetic retinopathy (DR) develops in a significant proportion of patients with chronic diabetes, characterized by retinal macular edema and abnormal retinal vessel outgrowth leading to vision loss. Chrysin, a naturally-occurring flavonoid found in herb and honeycomb, has anti-inflammatory, antioxidant, and anti-cancer properties. This study sought to determine the protective effects of chrysin on retinal neovascularization with abnormal vessels and blood-retinal barrier (BRB) breakdown in 33 mM glucose-exposed human retinal endothelial cells and in db/db mouse eyes. High glucose caused retinal endothelial apoptotic injury, which was inhibited by submicromolar chrysin. This compound diminished the enhanced induction of HIF-1α, vascular endothelial growth factor (VEGF), and VEGF receptor-2 (VEGFR2) in high glucose-exposed retinal endothelial cells. Consistently, oral administration of 10 mg/kg chrysin reduced the induction of these proteins in db/db mouse eye tissues. In addition, chrysin restored the decrement of VE-cadherin and ZO-1 junction proteins and PECAM-1 in hyperglycemia-stimulated retinal endothelial cells and diabetic mouse retina, possibly maintaining tight cell-cell interactions of endothelial cells and pericytes. Anti-apoptotic chrysin reduced the up-regulation of Ang-1, Ang-2, and Tie-2 crucial to retinal capillary occlusion and BRB permeability. Furthermore, orally treating chrysin inhibited acellular capillary formation, neovascularization, and vascular leakage observed in diabetic retinas. These observations demonstrate, for the first time, that chrysin had a capability to encumber diabetes-associated retinal neovascularization with microvascular abnormalities and BRB breakdown. View Full-Text
Keywords: angiogenesis; chrysin; diabetic retinopathy; retinal neovascularization; blood retinal barrier angiogenesis; chrysin; diabetic retinopathy; retinal neovascularization; blood retinal barrier
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MDPI and ACS Style

Kang, M.-K.; Park, S.-H.; Kim, Y.-H.; Lee, E.-J.; Antika, L.D.; Kim, D.Y.; Choi, Y.-J.; Kang, Y.-H. Dietary Compound Chrysin Inhibits Retinal Neovascularization with Abnormal Capillaries in db/db Mice. Nutrients 2016, 8, 782.

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