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The Effect of Oryza Sativa L. Subsp. Japonica Cultivar Yukihikari on The Immune System


 Oryza sativa L. subsp. japonica cultivar Yuhikikari is proposed to alleviate atopic dermatitis, although its mechanism is unclear. To clarify this issue, we evaluated the effect of Yukihikari on the immune system in vitro and in vivo by comparison with another Japanese cultivar Kirara397. A DNA microarray analysis of mouse spleen cells cultured with either Yukihikari or Kirara397 showed that Yukihikari-added spleen cells exhibited significantly reduced expression of pro-inflammatory genes. Furthermore, another transcriptome analysis of the cultivars by RNA sequencing showed a similar result to the DNA microarray analysis. Mice fed with Yukihikari had less germinal center B cells, fewer autoantibodies, and less weight than those fed with Kirara397. These results suggest that Yukihikari has immune-regulatory functions and accounts for its allergy-ameliorating effects.