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21.12.2016 | Original Contribution

Rice bran protein hydrolysates attenuate diabetic nephropathy in diabetic animal model

verfasst von: Kampeebhorn Boonloh, Eun Soo Lee, Hong Min Kim, Mi Hye Kwon, You Mi Kim, Patchareewan Pannangpetch, Bunkerd Kongyingyoes, Upa Kukongviriyapan, Supawan Thawornchinsombut, Eun Young Lee, Veerapol Kukongviriyapan, Choon Hee Chung

Erschienen in: European Journal of Nutrition | Ausgabe 2/2018

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Abstract

Introduction

Diabetic nephropathy (DN) is an important microvascular complication of uncontrolled diabetes. The features of DN include albuminuria, extracellular matrix alterations, and progressive renal insufficiency. Rice bran protein hydrolysates (RBPs) have been reported to have antihyperglycemic, lipid-lowering, and anti-inflammatory effects in diabetic rats. Our study was to investigate the renoprotective effects of RBP in diabetic animals and mesangial cultured cells.

Methods

Eight-week-old male db/m and db/db mice were orally treated with tap water or RBP (100 or 500 mg/kg/day) for 8 weeks. At the end of the experiment, diabetic nephropathy in kidney tissues was investigated for histological, ultrastructural, and clinical chemistry changes, and biomarkers of angiogenesis, fibrosis, inflammation, and antioxidant in kidney were analyzed by Western blotting. Protection against proangiogenic proteins and induction of cytoprotection by RBP in cultured mesangial cells was evaluated.

Results

RBP treatment improved insulin sensitivity, decreased elevated fasting serum glucose levels, and improved serum lipid levels and urinary albumin/creatinine ratios in diabetic mice. RBP ameliorated the decreases in podocyte slit pore numbers, thickening of glomerular basement membranes, and mesangial matrix expansion and suppressed elevation of MCP-1, ICAM-1, HIF-1α, VEGF, TGF-β, p-Smad2/3, and type IV collagen expression. Moreover, RBP restored suppressed antioxidant Nrf2 and HO-1 expression. In cultured mesangial cells, RBP inhibited high glucose-induced angiogenic protein expression and induced the expression of Nrf2 and HO-1.

Conclusion

RBP attenuates the progression of diabetic nephropathy and restored renal function by suppressing the expression of proangiogenic and profibrotic proteins, inhibiting proinflammatory mediators, and restoring the antioxidant and cytoprotective system.

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Titel: Rice bran protein hydrolysates attenuate diabetic nephropathy in diabetic animal model
verfasst von: Kampeebhorn Boonloh
Eun Soo Lee
Hong Min Kim
Mi Hye Kwon
You Mi Kim
Patchareewan Pannangpetch
Bunkerd Kongyingyoes
Upa Kukongviriyapan
Supawan Thawornchinsombut
Eun Young Lee
Veerapol Kukongviriyapan
Choon Hee Chung
Publikationsdatum: 21.12.2016
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nutrition / Ausgabe 2/2018
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-016-1366-y

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Rice bran protein hydrolysates attenuate diabetic nephropathy in diabetic animal model

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Introduction

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Results

Conclusion

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Introduction

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