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As rice bran contains various nutrients and other proteins of which a part has biological effects on animal cells, we tested the effect of rice bran extract on rat mesenchymal stem cells (rMSCs) obtained from bone marrow. These rMSCs are pluripotent and can be readily induced to differentiate into a number of cell types, including bone and cartilage. rMSC was aggregated by culturing in serum-free condition with rice bran extract, but was not aggregated by culturing in serum-free condition or in serum-containing medium. Moreover, the longer aggregates of rMSCs were cultured in serum-free condition with rice bran extract, the more the aggregates grew. After two passages in serum-free conditions, rMSCs lost their potency for differentiation into osteogenic cells; however, the addition of rice bran extract to serum-free medium successfully prevented the loss of this ability for differentiation. In addition, MSC makers CD105 and CD166 gene expression in serum-free condition with rice barn extract corresponded to these expressions in serum-containing medium. This result suggests that certain factors in rice bran could be bioactive and contribute toward retaining the ability of MSCs to differentiate into osteogenic cells after passaging.

Rice bran extract affects differentiation of mesenchymal stem cells potency into osteogenic cells