Differentiation-inducing factor-1の血管新生抑制作用にはWnt/β-cateninシグナル経路に非依存的なVEGFR-2発現阻害が関与する(Anti-angiogenic effects of differentiation-inducing factor-1 involving VEGFR-2 expression inhibition independent of the Wnt/β-catenin signaling pathway)