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Hypoglycemic effects of exopolysaccharides produced by mycelial cultures of two different mushrooms Tremella fuciformis and Phellinus baumii in ob/ob mice

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Abstract

The anti-diabetic activities of the exopolysaccharides (EPS) produced by submerged mycelial culture of two different mushrooms, Tremella fuciformis and Phellinus baumii, in ob/ob mice were investigated. All the animals were randomly divided into three groups with seven animals in each group: The control group received 0.9% NaCl solution; the diabetic groups were treated with EPS from T. fuciformis (Tf EPS) and P. baumii (Pb EPS) at the level of 200 mg/kg body weight using an oral zoned daily for 52 days. The plasma glucose levels in the EPS-fed mice were substantially reduced by about 52% (Tf EPS) and 32% (Pb EPS), respectively, as compared to control mice. The results of oral glucose tolerance test (OGTT) revealed that both EPS-fed groups significantly increased the glucose disposal after 52 days of EPS treatments. Furthermore, higher food efficiency ratios and reduced blood triglyceride levels were observed in the EPS-treated groups. Because peroxisome proliferator-activated receptor gamma (PPAR-γ) is indeed a key regulator of insulin action, we investigated the expression pattern of adipose tissue PPAR-γ messenger RNA (mRNA) and plasma levels of PPAR-γ. It was revealed that PPAR-γ was significantly activated in response to EPS treatments. The results suggested that both EPS exhibited considerable hypoglycemic effect and improved insulin sensitivity possibly through regulating PPAR-γ-mediated lipid metabolism. Our results indicated that two mushroom-derived EPS might be developed as potential oral hypoglycemic agents or functional foods for the management of non-insulin-dependent diabetes mellitus.

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Acknowledgment

This study was supported by the Technology Development Program for Agriculture and Forestry, Ministry of Agriculture and Forestry, Republic of Korea (grant no. 105079-03-1-SB010). C.E.J., H.J.H., S.W.K., and Y.M.B. were supported by a scholarship of the second stage of the Brain Korea 21 Project. Eun Jae Cho and Hye Jin Hwang contributed equally to this work.

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  1. Department of Biotechnology, Daegu University, Kyungsan, Kyungbuk, 712-714, Republic of Korea

    Eun Jae Cho, Hye Jin Hwang, Sang Woo Kim, Jung Young Oh, Yu Mi Baek & Jong Won Yun

  2. Department of Bioindustry, Daegu University, Kyungsan, Kyungbuk, 712-714, Republic of Korea

    Jang Won Choi

  3. Department of Food and Biotechnology, Hankyong National University, Anseong, Gyeonggi-Do, South Korea

    Song Hwan Bae

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  1. Eun Jae Cho
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Correspondence to Jong Won Yun.

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Cho, E.J., Hwang, H.J., Kim, S.W. et al. Hypoglycemic effects of exopolysaccharides produced by mycelial cultures of two different mushrooms Tremella fuciformis and Phellinus baumii in ob/ob mice. Appl Microbiol Biotechnol 75, 1257–1265 (2007). https://doi.org/10.1007/s00253-007-0972-2

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