Eucommiae Cortex (Eucommia ulmoides Oliver Bark) has been used for anti-osteoporosis usually as an ethnic drug for hundred years in China. In this study, a bioactive compound, 5-(hydroxymethyl)-2-furaldehyde (5-HMF), was isolated from Eucommiae Cortex. We found that after rat bone mesenchymal stem cells (bMSCs) were induced by 5-HMF at the concentration of 0.05, 0.10 and 0.20 μg/mL in the normal medium for 7 and 14 days, the mRNA expression of ALP, COLlαl (7 days only), OCN and OPN increased. However, in the adipogenic induction medium (AIM), the mRNA expression of PPARγ, FABP4, C/EBPα and LPL decreased with the 5-HMF treatment. Mineralized nodule formations were enhanced after bMSCs were induced by 5-HMF for 14 and 21 days in normal medium. In the AIM medium, 5-HMF not only inhibited the formation of adipose cells obviously, but also stimulated the mineralized nodule formation after induced for 21 days. These results indicated that 5-HMF was a powerful inhibitor of adipogenesis and enhancer of osteoblastogenesis. It may be one of the constituents contributing to anti-osteoporosis in Eucommiae Cortex.
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