再生障碍性贫血患儿骨髓间充质干细胞的生物学特点

为了观察和比较再生障碍性贫血患儿、正常同年龄段儿童和胎儿3种来源的骨髓间充质干细胞（MSC）的体外增殖能力及表面标志的表达,利用体外培养的方法从再生障碍性贫血患儿的骨髓分离培养MSC,以胎儿和儿童的MSC作为对照;通过对细胞形态和生长特性的观察,并用流式细胞术和免疫细胞化学方法进行检测以比较三者之间的异同.结果表明：从再生障碍性贫血患儿骨髓中分离、培养、扩增得到了MSC,与胎儿和正常儿童骨髓来源的MSC在细胞形态、流式表达模式和免疫细胞化学表达方面基本一致,但再生障碍性贫血患儿骨髓MSC的体外扩增能力有别于胎儿及正常儿童.虽然在早期培养时再生障碍性贫血患儿的骨髓MSC具有与正常儿童相似的扩增速度,但当群体倍增值（population doubling,PD）达20之后基本不再有增殖能力了,而正常儿童和胎儿来源的MSC却可稳定扩增到30 PD.结论：再生障碍性贫血患儿骨髓MSC在表面抗原标志方面与对照组相比无明显异常,但体外增殖能力弱于对照组.

Biological Characteristics of Mesenchymal Stem Cells from Bone Marrow of Patients with Aplastic Anemia

To investigate the differences of proliferation capacity and phenotype properties of mesenchymal stem cells (MSCs) derived from bone marrow (BM) of aplastic anemia patients, fetuses and children, MSCs were isolated from BM of patients with aplastic anemia and expanded in vitro; MSCs derived from BM of fetuses and children were used as normal control groups, three sources of MSCs were compared by morphology, in vitro proliferation capacity, phenotype and immunocytochemistry. The results showed that MSCs could be isolated and expanded from aplastic anemia patient BM. MSCs derived from BM of aplastic anemia patients shared a similar morphology and phenotype with derived MSCs from BM of fetuses and children. However, in vitro proliferation capacity of MSCs derived from BM of aplastic anemia patients after 20 population doublings (PD) was significantly lower, compared with MSCs from BM of fetuses and children. BM MSCs derived from children and fetuses proliferated for more than 30 PD. It is concluded that BM MSCs from aplastic anemia patients appears to be normal in phenotype but their proliferation capacity is lower in comparison with control groups.