小檗碱对大鼠骨髓间质干细胞成脂分化的抑制作用(英文)

目的探讨小檗碱对大鼠骨髓间质干细胞成脂分化的影响及其机制。方法经分离纯化的大鼠骨髓间质干细胞,分为正常对照组,成脂分化诱导液(AIM)模型组及AIM+小檗碱0.1,0.3,1和3μmol·L-1组。倒置显微镜下观察细胞的形态特征,油红O染色检测脂肪细胞,以对硝基苯磷酸为底物检测碱性磷酸酶(ALP)活性,MTT法检测细胞存活率,RT-PCR检测过氧化物酶体增殖物激活受体γ(PPARγ),脂肪酸结合蛋白(aP2)和CCAAT增强子结合蛋白α(C/EBPα)mRNA表达。结果与正常对照组比较,AIM模型组细胞形成的脂肪细胞明显增加(P<0.01),ALP活性明显降低(P<0.01),PPAR,γaP2和C/EBPαmRNA表达明显增高(P<0.01)。与AIM组比较,AIM+小檗碱显著抑制骨髓间质干细胞成脂分化,小檗碱0.1,0.3,1和3μmol·L-1显著升高ALP活性,分别增加26%,54%,81%和122%;小檗碱3μmol·L-1显著下调PPARγmRNA(0.91±0.10vs1.34±0.06),(P<0.01),aP2 mRNA(1.05±0.10vs1.53±0.09)(P<0.01)和C/EBPαmRNA表达(1.24±0.06vs1.54±0.09)(P<0.01)。小檗碱对骨髓间质干细胞增殖无显著影响。结论小檗碱能够抑制骨髓间质干细胞成脂分化,该作用可能与其下调PPARγmRNA,aP2 mRNA和C/EBPαmRNA表达有关。

Inhibitory effect of berberine on differentiation of rat bone marrow mesenchymal stem cells to adipocytes

OBJECTIVE To investigate the effect of berberine on differentiation of rat bone marrow mesenchymal stem cells (MSCs) to adipocytes and its mechanism. METHODS Rat MSCs were isolated and cultured, adipocytic differentiation was induced with adipogenesis-inducing medium (AIM). Cells were assigned into 6 groups:normal control, AIM group, AIM+berberine 0.1, 0.3, 1 and 3 μmol·L-1 groups, respectively. Morphology characteristics of mesenchymal stem cells were observed under an inverted microscope and adipocyte levels were analyzed by oil O staining. Alkaline phosphatase (ALP) activity was detected using p-nitrophenyl phosphate as a substrate. The cell survival was determined by MTT assay. Expressions of peroxisome proliferator activated receptor γ (PPARγ), fatty acid binding protein (aP2) and CCAAT enhancer-binding protein α (C/EBPα) mRNA were detected by semiquantitative RT-PCR. RESULTS Compared with normal control group, MSCs adipogenic differentiation, PPARγ, aP2 and C/EBPα mRNA expression significantly increased in AIM group (P<0.01), ALP activity in AIM group significantly decreased (P<0.01). Compared with AIM group, berberine inhibited MSCs adipogenic differentiation (P<0.01) and berberine 0.1, 0.3, 1 and 3 μmol·L-1 increased ALP activity by 26%, 54%, 81% and 122%, respectively. Berberine 3 μmol·L-1 significantly downregulated PPARγ expression (0.91±0.10 vs 1.34±0.06) (P<0.01), aP2 (1.05±0.10 vs 1.53±0.09) (P<0.01) and C/EBPα mRNA (1.24±0.06 vs 1.54±0.09) (P<0.01). Berberine had no effect on proliferation of MSCs. CONCLUSION Berberine inhibits differentiation of MSCs into adipocytes, which might be closely related to the downregulation of PPARγ, aP2 and C/EBPα mRNA.