Production of extracellular polysaccharides by submerged mycelial culture of Laetiporus sulphureus var. miniatus and their insulinotropic properties

Applied Microbiology and Biotechnology
Hee Sun HwangJong Won Yun

Abstract

In the present study, optimum culture conditions for the production of extracellular polysaccharides (EPS) in submerged culture of an edible mushroom, Laetiporus sulphureus var. miniatus and their stimulatory effects on insulinoma cell (RINm5F) proliferation and insulin secretion were investigated. The maximum mycelial growth (4.1 g l(-1)) and EPS production (0.6 g l(-1)) in submerged flask culture were achieved in a medium containing 30 g l(-1) maltose, 2 g l(-1) soy peptone, and 2 mM MnSO(4).5H2O at an initial pH 2.0 and temperature 25 degrees C. In the stirred-tank fermenter under optimized medium, the concentrations of mycelial biomass and EPS reached a maximum level of 8.1 and 3.9 g l(-1), respectively. Interestingly, supplementation of deep sea water (DSW) into the culture medium significantly increased both mycelial biomass and EPS production by 4- and 6.7-fold at 70% (v/v) DSW medium, respectively. The EPS were proved to be glucose-rich polysaccharides and were able to increase proliferation and insulin secretary function of rat insulinoma RINm5F cells, in a dose-dependent manner. In addition, EPS also strikingly reduced the streptozotocin-induced apoptosis in RINm5F cells indicating the mode of the cytoprotective role ...Continue Reading

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Citations

Jul 6, 2013·Applied Microbiology and Biotechnology·Liping BaiYuan Li
Dec 12, 2012·World Journal of Microbiology & Biotechnology·Małgorzata PleszczyńskaJanusz Szczodrak
Apr 29, 2015·Journal of Asian Natural Products Research·Xia YinJi-Kai Liu
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