Promotive Effects of Yokukansan, a Traditional Japanese Medicine, on Proliferation and Differentiation of Cultured Mouse Cortical Oligodendrocytes

Abstract

Effects of yokukansan, a traditional Japanese medicine, on proliferation and differentiation of oligodendrocytes were examined using purified mouse cortical oligodendrocyte precursor cells (OPCs). OPCs were cultured for four days, and proliferation was evaluated by counting A2B5 (a specific antibody to OPC)-reactive cells on the second day of cell culture. Differentiation from OPC to oligodendrocyte was evaluated by counting O4 (a specific antibody to detect differentiated cells in various stages)-reactive cells on the fourth day of culture. The effects of yokukansan (final concentration: 100 or 200 μg/ml) on proliferation and differentiation were examined by adding it to the medium for four days. Yokukansan increased not only the number of A2B5-positive cells on the second day but also the number of O4-positive cells on the fourth day compared to those in the corresponding controls. A WST-8 assay was used to identify active components from seven components of Uncaria Hook (UH), one of the constituent galenicals of yokukansan. Geissoschizine methyl ether (GM: 0.1 - 3.0 μM) was identified by this screening assay and increased the number of A2B5-positive cells on the second day and O4-positive cells on the fourth day as yokukansan did. These results suggest that yokukansan promotes the proliferation and differentiation of oligodendrocytes, and also that GM contained in UH is one of active components responsible for this effect of yokukansan.

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Ueki, T. , Ikarashi, Y. , Kawakami, Z. , Mizoguchi, K. and Kase, Y. (2014) Promotive Effects of Yokukansan, a Traditional Japanese Medicine, on Proliferation and Differentiation of Cultured Mouse Cortical Oligodendrocytes. Pharmacology & Pharmacy, 5, 670-680. doi: 10.4236/pp.2014.57077.

Conflicts of Interest

The authors declare no conflicts of interest.

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