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Int. J. Mol. Sci. 2015, 16(9), 22473-22484; doi:10.3390/ijms160922473

Protective Effects of MDG-1, a Polysaccharide from Ophiopogon japonicus on Diabetic Nephropathy in Diabetic KKAy Mice

1,†
,
1,†
,
1
,
2,* and 1,*
1
Engineering Research Center of Modern Preparation Technology of TCM, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
2
Murad Research Institute for Modernized Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Toshiro Arai
Received: 27 July 2015 / Revised: 27 August 2015 / Accepted: 31 August 2015 / Published: 17 September 2015
(This article belongs to the Special Issue Molecular Research on Obesity and Diabetes)
View Full-Text   |   Download PDF [5438 KB, uploaded 17 September 2015]   |  

Abstract

Ophiopogon japonicus is a traditional Chinese medicine that might be effective for treating type 2 diabetes. Recent research confirmed that MDG-1, a polysaccharide from O. japonicas, activates the PI3K/Akt signaling pathway and improves insulin sensitivity in a diabetic KKAy mouse model, but little is known about its effects on diabetic nephropathy. In this study, KKAy mice were orally administered distilled water (control group), MDG-1, or rosiglitazone for 12 weeks. Blood glucose levels were tested every two weeks for the fed mice. At 6 and 12 weeks, blood samples were collected for biochemical examination. At the end of the experiment, all kidney tissues were collected for histological examination and western blot analysis. Results show that MDG-1 (300 mg/kg) significantly decreased the levels of blood glucose, triglycerides, blood urine nitrogen and albumin, and significantly inhibited the expression of transforming growth factor-beta 1 and connective tissue growth factor. Moreover, MDG-1 could alleviate glomerular mesangial expansion and tubulointerstitial fibrosis in the diabetic mice, as confirmed by histopathological examination. These data indicated that MDG-1 ameliorates renal disease in diabetic mice by reducing hyperglycemia, hyperinsulinemia, and hyperlipidemia, and by inhibiting intracellular signaling pathways. View Full-Text
Keywords: diabetic nephropathy; Ophiopogon japonicus; polysaccharide diabetic nephropathy; Ophiopogon japonicus; polysaccharide
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MDPI and ACS Style

Wang, Y.; Shi, L.-L.; Wang, L.-Y.; Xu, J.-W.; Feng, Y. Protective Effects of MDG-1, a Polysaccharide from Ophiopogon japonicus on Diabetic Nephropathy in Diabetic KKAy Mice. Int. J. Mol. Sci. 2015, 16, 22473-22484.

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