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Short chain regioselectively hydrolyzed scleroglucans induce maturation of porcine dendritic cells

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Branched β-1,3/1,6-glucans (scleroglucan) were produced by cultivation of Sclerotium rolfsii ATCC 15205. Regioselective hydrolysis at the β-1,3-linkage of the cell-free and purified polysaccharide was performed in borosilicate glass bottles at pH 5, 121°C, and 1 bar for 72 h. The mixture was divided into four molar mass fractions by stepwise cross-flow filtration using different cutoffs. In vitro studies revealed that scleroglucan hydrolysates with a low molar mass of less than 5 kDa significantly stimulated the activation and maturation of porcine monocyte derived dendritic cells (MoDC) by upregulation of CD40 and CD80/86 as well as by reduction of antigen uptake. MoDC treated with low molar mass scleroglucan showed a considerable increase in the amounts of secreted proinflammatory cytokine tumor necrosis factor alpha and stimulated the proliferation of lymphocytes. Therefore, scleroglucan molecules of low molecular weight are able to induce activation and maturation of porcine DC, which are key initiators of inflammatory and adaptive immune responses, and could provide improved protection against infectious diseases.

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The study was kindly supported by the Federal Ministry of Food, Agriculture and Consumer Protection managed by the Federal Institute of Agriculture and Food (grant 05HS010) and by the EU, 6th framework program “Feed for Pig Health”, FOOD-CT 2004-506144.

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Correspondence to Udo Rau.

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Bimczok, D., Wrenger, J., Schirrmann, T. et al. Short chain regioselectively hydrolyzed scleroglucans induce maturation of porcine dendritic cells. Appl Microbiol Biotechnol 82, 321–331 (2009).

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  • Porcine dendritic cells
  • Cytokines
  • β-Glucan
  • Scleroglucan
  • Regioselective hydrolysis