心肌营养素1诱导骨髓间充质干细胞分化为心肌样细胞

目的: 探索心肌营养素1(CT-1)对小型猪骨髓间充质干细胞(MSCs)向心肌样细胞分化的影响。方法: 获取、扩增稳定的成体西藏小型猪MSCs,鉴定成脂、成骨潜能。分4组诱导向心肌样细胞分化,包括空白对照组、5-氮杂胞苷(5-Aza)组、CT-1组、5-Aza和CT-1合用组。取诱导后4周的细胞加肌动蛋白(α-actin)和心肌肌钙蛋白T(cTnT)抗体,进行免疫荧光染色,最后计数红色荧光阳性染色率。结果: 分组诱导分化结果,合用组的诱导分化心肌样细胞α-actin阳性率为29.90%±4.76%,明显大于5-Aza组(17.73%±2.35%,P<0.01)、CT-1组(6.63%±0.55%,P<0.01)和空白对照组(1.62%±0.09%,P<0.01);5-Aza组明显大于CT-1组(P<0.01)和空白对照组(P<0.01);CT-1组明显大于空白对照组(P<0.05)。cTnT红色荧光染色结果显示:合用组的诱导分化心肌样细胞cTnT阳性率为36.50%±4.09%,明显大于5-Aza组(14.37%±1.65%,P<0.01)、CT-1组(7.50%±0.61%,P<0.01)和空白对照组(1.12%±0.23%,P<0.01);5-Aza组明显大于CT-1组(P<0.01)和空白对照组(P<0.01);CT-1组明显大于空白对照组(P<0.01)。结论: 适宜浓度的5-Aza(10 μmol/L)和CT-1(0.1 μg/L)能够在体外诱导小型藏猪骨髓MSCs转化为心肌样细胞,诱导后的细胞获得部分心肌细胞特异性蛋白的表达。CT-1与5-Aza联合可明显提高诱导率。

Differentiation of bone marrow mesenchymal stem cells into cardiomyocyte-like cells in vitro via cardiotrophin 1

AIM: To investigate the effects of cardiotrophin 1 (CT-1) on differentiation of swine bone marrow mesenchymal stem cells (MSCs) into cardiomyocyte-like cells in vitro.METHODS: MSCs were isolated and proliferated from Tibet miniswine. Adipogenic and osteogenic potentials were identified. MSCs were divided into 4 groups for induction: untreated group, 5-azacytidine (5-Aza) group,CT-1 group and 5-Aza combined with CT-1 group. After induction for 4 weeks, the expression of cardiac cell markers including α-actin and cardiac troponin-T (cTnT) was estimated by immunofluorescence staining. Finally, the rates of red fluorescence positive-staining cells were calculated. RESULTS: The expression of α-actin in the 4 groups by red fluorescence staining was as follows: the differentiation rate of cardiomyocyte-like cells in combination group was 29.90%±4.76%, significantly higher than that in 5-Aza group (17.73%±2.34%, P<0.01), CT-1 group (6.63%±0.55%, P<0.01) and untreated group (1.62%±0.09%, P<0.01). The differentiation rate in 5-Aza group was significantly higher than that in CT-1 group (P<0.01) and untreated group (P<0.05). The differentiation rate in CT-1 group was significantly higher than that in untreated group (P<0.01). The expression of cTnT in the 4 groups was as follows: the differentiation rate of cardiomyocyte-like cells in combination group was 36.50%±4.09%, significantly higher than that in 5-Aza group (14.37%±1.65%, P<0.01), CT-1 group (7.50%±0.61%, P<0.01) and untreated group (1.12%±0.23%, P<0.01). The differentiation rate in 5-Aza group was significantly higher than that in CT-1 group (P<0.01) and untreated group (P<0.01). The differentiation rate in CT-1 group was significantly higher than that in untreated group (P<0.01).CONCLUSION: Appropriate concentrations of 5-Aza (10 μmol/L) and CT-1 (0.1 μg/L) induce swine bone marrow MSCs to differentiate into cardiomyocyte-like cells in vitro. CT-1 combined with 5-Aza significantly increases the differentiation rate.