Natural products are one of the main sources for discovering new lead compounds. We previously reported that cinnamon extract has a promising effect in regulating lipid tissue volume and insulin sensitivity in vivo. However, its effective component and the underlying mechanism are not known. In the present study, we analyzed the effect of different components of cinnamon on regulating insulin sensitivity in 3T3-L1 adipocytes. Functional assay revealed that, of the six major components of cinnamon extracts, the B-type procyanidin, procyanidin C1, improves the differentiation of 3T3-L1 cells (TG content: 1.10 +/- 0.09 mM at a dosage of 25 mu M vs 0.67 +/- 0.02 mM in vehicle group, p < 0.001) and promotes insulin-induced glucose uptake (8.58 +/- 1.43 at a dosage of 25 mu M vs 3.05 +/- 1.24 in vehicle group, p < 0.001). Mechanism studies further suggested that procyanidin C1 activates the AKT-eNOS pathway, thus up-regulating glucose uptake and enhancing insulin sensitivity in mature adipocytes. Taken together, our study identified B-type procyanidin C1, a component of cinnamon extract, that stimulates preadipocyte differentiation and acts as a potential insulin action enhancer through the AKT-eNOS pathway in mature adipocytes.
[1]Chinese Acad Sci, Shanghai Inst Mat Med, 555 Zuchongzhi Rd, Shanghai 201203, Peoples R China.
[2]Nanjing Med Univ, Key Lab Human Funct Genom Jiangsu Prov, Nanjing 211166, Jiangsu, Peoples R China.
[3]Shanghai Univ Tradit Chinese Med, Sch Pharm, 1200 Cailun Rd, Shanghai 201203, Peoples R China.
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