Abstract
Fermented soybean foods have been shown to reduce incidence of diabetes and improve insulin sensitivity. 6-Hydroxydaidzein (6-HD) is a bioactive ingredient isolated from fermented soybean. In this study, we examined the effects of 6-HD on adipocyte differentiation and insulin-stimulated glucose uptake, as well as the mechanisms involved. In our experiments, 6-HD enhanced 3T3-L1 adipocyte differentiation and insulin-stimulated glucose uptake in a dosage-dependent manner. In addition, 6-HD increased peroxisome proliferator-activated receptor gamma (PPARγ) gene expression and PPARγ transcriptional activity. 6-HD increased CCAAT/enhanced binding protein alpha (C/EBPα) expression as well. Although having no effects on glucose transporter type 4 (GLUT4) gene expression, 6-HD facilitated GLUT4 protein translocation to the cell membranes. Our results indicate that 6-HD exhibited the actions of promoting adipocyte differentiation and improving insulin sensitivity by increasing the expression of C/EBPα and facilitating the translocation of GLUT4 via the activation of PPARγ, suggesting that 6-HD can be promising in diabetes management.
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