目的探究低氧微环境对小鼠骨髓间充质干细胞(mouse bone marrow mesenchymal stem cells,mMSCs)与聚3羟基丁酸酯-co-4羟基丁酸酯[3-hydroxybutyrate-co-4-hydroxybutyrate,P(3HB-co-4HB)]材料共培养形成心肌补片的影响,为细胞移植术治...目的探究低氧微环境对小鼠骨髓间充质干细胞(mouse bone marrow mesenchymal stem cells,mMSCs)与聚3羟基丁酸酯-co-4羟基丁酸酯[3-hydroxybutyrate-co-4-hydroxybutyrate,P(3HB-co-4HB)]材料共培养形成心肌补片的影响,为细胞移植术治疗心肌梗死提供一种更有效的心肌补片。方法全骨髓培养法提取小鼠骨髓间充质干细胞(mMSCs),取5代mMSCs流式细胞术鉴定表面抗原。将P(3HB-co-4HB)与小鼠骨髓间充质干细胞共培养制作成细胞补片,随机分为常氧组和低氧组,每组各10个样本,0、12、24 h分别用CCK-8法测定细胞增殖情况;扫描电子显微镜(scanning electron microscope,SEM)观察补片存活、黏附、生长情况。加入诱导剂5-氮杂胞苷2周后,免疫荧光检测两组心肌肌钙蛋白T(cTnT)的表达情况。结果在共培养24 h后,CCK-8法测定低氧组OD值(0.349±0.038)显著大于常氧组(0.308±0.025)( n =10, P <0.05),扫描电子显微镜观察到低氧组P(3HB-co-4HB)材料上细胞数量更多,细胞与材料之间的黏附牢固,细胞形态正常。免疫荧光显示低氧组cTnT表达比常氧组更加显著。结论相对于常氧条件,低氧微环境可促进骨髓间充质干细胞在P(3HB-co-4HB)材料上的黏附、存活、增殖、分化,形成一种更有效的心肌补片。展开更多
Copolyesters of 3 hydroxybutyrate and 4 hydroxybutyrate along with terpolyesters of 3 hydroxybutyrate, 3 hydroxyvalerate and 4 hydroxybutyrate were produced using Alcaligenes latus DSM 1124 in growth media with p...Copolyesters of 3 hydroxybutyrate and 4 hydroxybutyrate along with terpolyesters of 3 hydroxybutyrate, 3 hydroxyvalerate and 4 hydroxybutyrate were produced using Alcaligenes latus DSM 1124 in growth media with precursors of 1,4 butanediol or 1,4 butanediol and valerate. Monomer mass fraction w in the copolyesters varied from 63% to 78% 3 hydroxybutyrate and 1 5% to 6 5% 4 hydroxybutyrate (cell dry weight), depending on precursor supplied. w(monomer) in the terpolyesters varied from 55% to 69% 3 hydroxybutyrate, 0 5% to 3 4% 4 hydroxybutyrate and 3 4% to 16% 3 hydroxyvalerate.展开更多
文摘目的探究低氧微环境对小鼠骨髓间充质干细胞(mouse bone marrow mesenchymal stem cells,mMSCs)与聚3羟基丁酸酯-co-4羟基丁酸酯[3-hydroxybutyrate-co-4-hydroxybutyrate,P(3HB-co-4HB)]材料共培养形成心肌补片的影响,为细胞移植术治疗心肌梗死提供一种更有效的心肌补片。方法全骨髓培养法提取小鼠骨髓间充质干细胞(mMSCs),取5代mMSCs流式细胞术鉴定表面抗原。将P(3HB-co-4HB)与小鼠骨髓间充质干细胞共培养制作成细胞补片,随机分为常氧组和低氧组,每组各10个样本,0、12、24 h分别用CCK-8法测定细胞增殖情况;扫描电子显微镜(scanning electron microscope,SEM)观察补片存活、黏附、生长情况。加入诱导剂5-氮杂胞苷2周后,免疫荧光检测两组心肌肌钙蛋白T(cTnT)的表达情况。结果在共培养24 h后,CCK-8法测定低氧组OD值(0.349±0.038)显著大于常氧组(0.308±0.025)( n =10, P <0.05),扫描电子显微镜观察到低氧组P(3HB-co-4HB)材料上细胞数量更多,细胞与材料之间的黏附牢固,细胞形态正常。免疫荧光显示低氧组cTnT表达比常氧组更加显著。结论相对于常氧条件,低氧微环境可促进骨髓间充质干细胞在P(3HB-co-4HB)材料上的黏附、存活、增殖、分化,形成一种更有效的心肌补片。
文摘Copolyesters of 3 hydroxybutyrate and 4 hydroxybutyrate along with terpolyesters of 3 hydroxybutyrate, 3 hydroxyvalerate and 4 hydroxybutyrate were produced using Alcaligenes latus DSM 1124 in growth media with precursors of 1,4 butanediol or 1,4 butanediol and valerate. Monomer mass fraction w in the copolyesters varied from 63% to 78% 3 hydroxybutyrate and 1 5% to 6 5% 4 hydroxybutyrate (cell dry weight), depending on precursor supplied. w(monomer) in the terpolyesters varied from 55% to 69% 3 hydroxybutyrate, 0 5% to 3 4% 4 hydroxybutyrate and 3 4% to 16% 3 hydroxyvalerate.
