机构地区:[1]徐州市心血管病研究所徐州市中心医院,221009
出 处:《中华心血管病杂志》2013年第2期150-155,共6页Chinese Journal of Cardiology
基 金:国家自然科学基金资助项目(30572073);江苏省自然科学基金项目(BK2005428);江苏省医学重点人才(RC2007024);徐州市科技发展项目(XF10C029)
摘 要:目的研究胰岛素样生长因子1(IGF-1)诱导骨髓间充质干细胞(BMSC)分化为心肌样细胞的能力及其机制。方法分离大鼠BMSC,并在体外培养纯化。实验分为两个部分:第一部分,IGF-1诱导BMSC分化为心肌样细胞的实验研究,分为培养基对照组(对照组)和15ng/ml的IGF-1诱导组(IGF.1组),连续培养21d,分别在第3、7、14和21天采用免疫细胞化学染色法和Westernblot法检测BMSC中磷酸化(P)IGF.1受体(R)、心肌特异性肌钙蛋白T(TNT)及肌钙蛋白I(TNI)的表达。第二部分为IGF-1R激酶阻断剂I-OMeAG538阻断IGF-1诱导BMSC向心肌样细胞分化的实验研究,分为培养基对照组(对照组)、15ng/mlIGF-1诱导组(IGF-l组)、300nmol/LI-OMeAG538阻断组(I-OMeAG538组)及300nmol/LI-OMeAG538阻断+15ng/mlIGF-l诱导组(I-OMeAG538+IGF-l组)。免疫细胞化学法和Westernblot法检测BMSC中TNT及TNI、MAPK和P13K信号通路的蛋白表达水平。结果IGF-1诱导BMSC分化的实验结果显示IGF-1组诱导后,TNT、TNI的表达均呈阳性,plGF-1R的表达量也明显高于对照组(上述因子均未检测到),以第14天为最高(P〈0.05)。I-OMeAG538作用BMSC3和6h后,I-OMeAG538组pERKl/2/ERKl/2比值分别为0.17±0.03和0.06±0.03,均显著低于对照组的1.00±0.05(P均〈0.05)。IGF-1组pAKT/AKT和pERKl/2ERKl/2的比值分别为1.00±0.07和1.00±0.09均显著高于对照组的0.724-0.05(P均〈0.05),而l-OMeAG538组pAKT/AKT和pERKl/2ERKl/2的比值分别为0.31±0.10和0.39±0.04均显著低于对照组的0.63±0.05(P均〈0.05)。I-ONeAG538+IGF-1组心肌样细胞的TNT和TNI蛋白表达的灰度值分别为195.064-5.98和198.32±3.46均显著高于IGF-1组的188.70±5.35和176.10±4.96(P均〈0.05)。IGF-1组IGF诱导BMSC3、7、14和21d后,其TNT、TNI和pIGF-1R的蛋白表达水平均高于对照组,且�Objective To explore the ability and mechanism of insulin-like growth factor 1 (IGF-1) induced bone mesenchymal stem cells (BMSCs)differentiation into cardiomyocyte-like cells (CLCs). Methods BMSCs were isolated and purified in vitro. BMSCs were treated with control medium and 15 ng/ml IGF-1 for 3, 7, 14 and 21 d, respectively. The expression of Troponin-T(TNT), Troponin-I (TN!) and pIGF-1R were detected by immunocytochemistry and Western blot. In another experimental setting, BMSCs were treated with control medium and 15 ng/ml IGF-1, IGF-1 antagonist I-OMe AG538 (300 nmol/L) and 300 nmol/L I-OMe AG538 + 15 ng/ml IGF-1 for 3 to 48 h, respectively. Phosphorylation status of ERK1/2 and AKT, the two downstream mediators of mitogen-activated protein kinase (MAPK) kinase and phosphatidylinositol 3-kinase (PI3K) pathways, were detected by immunocytochemistry and Western blot. Results After 3 to 21 d exposure to IGF-1, the expression of pIGF- 1 R, TNT and TNI were significantly higher in IGF-1 group than those in control group, pIGF-1R peaked 14 d ( all P 〈 0.05 ). After 3 and 6 h treatment, the ratio of pAKT/AKT(0. 17 ± 0. 03 ) and pERK1/2/ERK1/2 (0. 06 ±0. 03 )were significantly downregulated in I-OMe AG538 group compared to control group( 1.00 ± 0. 05 ) ( all P 〈 0. 05 ). The ratio of pAKT/AKT( 1.00± 0. 07 ) and pERK1/2/ERK1/2 ( 1.00 ± 0.09 ) were significantly upregulated in IGF-1 group compared to control group (0. 72 ± 0. 05 ) (all P 〈 0. 05 ), but the ratio of pAKT/AKT (0. 31 ± 0. 10 ) and pERK1/2/ERK1/2 ( 0. 39 ± 0. 04 ) were significantly downregulated in I-OMe AG538 group compared to control group ( 0. 63± 0. 05 ) ( all P 〈 0. 05 ), the value of gray scale of TNT ( 195.06 ±5.98 ) and TNI ( 198.32 ± 3.46 ) in I-OMe AG538 + IGF-1 group were significantly upregulated than that in IGF-1 group for TNT ( 188. 70 ±5.35)and TNI ( 176. 10 ±4. 96) (all P 〈0. 05). Condusiolm IGF-1 could induc
关 键 词:间质干细胞 胰岛素样生长因子I 细胞分化 心肌样细胞
分 类 号:R329[医药卫生—人体解剖和组织胚胎学]
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