Adult stem cells from skeletal muscle cells were induced to differentiate into cardiocytes to see if stem cells from another different but histologically-comparable tissues can differentiate to the target cells. Skele...Adult stem cells from skeletal muscle cells were induced to differentiate into cardiocytes to see if stem cells from another different but histologically-comparable tissues can differentiate to the target cells. Skeletal muscles-derived stem cells （MDSCs） were isolated from adult skeleton muscle tissues by differential adhesion, and immunocytochemically identified by using Sca-1. In order to induce the proliferation but not differentiation of MDSCs, the cells were cultured in Dulbecco’s modified Eagle’s medium/F12 （DMEM/F12） supplemented with 1：50 B27, 20 ng/mL basic fibroblast growth factor （bFGF）, 20 ng/mL epidermal growth factor （EGF） in a suspension for 6 days. Then these stem cells were treated with 5 μmol/L 5-azacytidine for 24 h in an adherence culture. The characteristics of induced cells were examined by immunocytochemistry, quantitative real time RT-PCR and morphological observation of cell phenotype. Our results showed that the appearance of some cells gradually changed from spindle-shape into polygonal or short-column-shape. Some of these post-treated cells could contract spontaneously and rhythmically. The expression of GATA-4 and cTnT was increased 1 and 2 week（s） after the treatment. And about 16.6% of post-treated cells were cTnT-positive. Therefore, we are led to conclude that skeletal muscle-derived stem cells could differentiate into cardiocyte-like cells, which exhibited some characteristics of cardiocytes.展开更多
目的研究人工虫草提取物对缺血心肌的保护作用及其机制。方法通过结扎大鼠左冠状动脉前降支(LAD)造成急性心肌缺血模型,观察人工虫草水提取物(Water extract from cultural mycelium,WE)、醇提取物(Ethanal extract from cul-tural myce...目的研究人工虫草提取物对缺血心肌的保护作用及其机制。方法通过结扎大鼠左冠状动脉前降支(LAD)造成急性心肌缺血模型,观察人工虫草水提取物(Water extract from cultural mycelium,WE)、醇提取物(Ethanal extract from cul-tural mycelium,EE)、醋酸乙酯提取物(Ethyl acetate extract from cultural mycelium,EA)和石油醚提取物(Petroleum ether ex-tract from cultural mycelium,PE)对心肌梗死面积(MIS)、血清磷酸肌酸肌酶(CK-MB)、乳酸脱氢酶(LDH)、丙二醛(MDA)、一氧化氮(NO)、一氧化氮合酶(NOS)及超氧化物歧化酶(SOD)的影响。结果WE,EE和PE可明显减小MIS,降低CK-MB及LDH活性,减少MDA含量,增高NO含量,提高NOS和SOD活性。结论WE,EE和PE对缺血心肌具有保护作用,其机制与WE,EE和PE提高NOS和SOD活性从而扩张冠状动脉和抗脂质过氧化有关。展开更多
基金supported by a grant from the National Natural Sciences Foundation of China (No 30872627)Hubei Provincial Natural Sciences Foundation (No 2007ABA133)
文摘Adult stem cells from skeletal muscle cells were induced to differentiate into cardiocytes to see if stem cells from another different but histologically-comparable tissues can differentiate to the target cells. Skeletal muscles-derived stem cells （MDSCs） were isolated from adult skeleton muscle tissues by differential adhesion, and immunocytochemically identified by using Sca-1. In order to induce the proliferation but not differentiation of MDSCs, the cells were cultured in Dulbecco’s modified Eagle’s medium/F12 （DMEM/F12） supplemented with 1：50 B27, 20 ng/mL basic fibroblast growth factor （bFGF）, 20 ng/mL epidermal growth factor （EGF） in a suspension for 6 days. Then these stem cells were treated with 5 μmol/L 5-azacytidine for 24 h in an adherence culture. The characteristics of induced cells were examined by immunocytochemistry, quantitative real time RT-PCR and morphological observation of cell phenotype. Our results showed that the appearance of some cells gradually changed from spindle-shape into polygonal or short-column-shape. Some of these post-treated cells could contract spontaneously and rhythmically. The expression of GATA-4 and cTnT was increased 1 and 2 week（s） after the treatment. And about 16.6% of post-treated cells were cTnT-positive. Therefore, we are led to conclude that skeletal muscle-derived stem cells could differentiate into cardiocyte-like cells, which exhibited some characteristics of cardiocytes.
文摘目的研究人工虫草提取物对缺血心肌的保护作用及其机制。方法通过结扎大鼠左冠状动脉前降支(LAD)造成急性心肌缺血模型,观察人工虫草水提取物(Water extract from cultural mycelium,WE)、醇提取物(Ethanal extract from cul-tural mycelium,EE)、醋酸乙酯提取物(Ethyl acetate extract from cultural mycelium,EA)和石油醚提取物(Petroleum ether ex-tract from cultural mycelium,PE)对心肌梗死面积(MIS)、血清磷酸肌酸肌酶(CK-MB)、乳酸脱氢酶(LDH)、丙二醛(MDA)、一氧化氮(NO)、一氧化氮合酶(NOS)及超氧化物歧化酶(SOD)的影响。结果WE,EE和PE可明显减小MIS,降低CK-MB及LDH活性,减少MDA含量,增高NO含量,提高NOS和SOD活性。结论WE,EE和PE对缺血心肌具有保护作用,其机制与WE,EE和PE提高NOS和SOD活性从而扩张冠状动脉和抗脂质过氧化有关。
