PNH患者骨髓CD34^＋CD59^＋细胞体外扩增及植入体内重建造血的活性研究

本研究应用BALB／c裸鼠为移植模型探讨阵发性睡眠性血红蛋白尿症（paroxysmal nocturnal hemoglobin—uria，PNH）患者CD34^＋CD59^＋的增殖和重建造血的能力，为实现PNH患者自体骨髓移植或自体外周血造血干细胞移植提供实验依据。利用免疫磁珠双阳性分选法，从正常人及PNH患者骨髓中分离出两组CD34^＋CD59^＋细胞，分别进行体外扩增，并将体外扩增的正常人和PNH患者骨髓CD34^＋CD59^＋细胞分别输注给接受亚致死剂量照射的BALB／c裸鼠。应用流式细胞技术和DNA检测技术检测受鼠骨髓、脾脏和外周血中人CD45^＋细胞。结果表明：PNH组的CD34^＋CD59^＋细胞在体外生存、扩增能力似弱于正常人对照组。但CD34^＋CD59^＋细胞输注给受鼠后6周，在受鼠骨髓、脾脏和外周血中可检测到人CD45^＋细胞，PNH组受鼠CD45^＋细胞水平与正常人对照组相比，无统计学差异。结论：PNH患者CD34^＋CD59^＋细胞仍具有同正常人CD34^＋CD59^＋细胞相同的生物特性，能体外扩增并能保持正常干／祖细胞的特性。

Ex Vivo Expansion of CD34+ CD59+ Cells from Patients with Paroxysmal Nocturnal Hemoglobinuria and Their Hematopoietic Reconstitution Capa-bility in Irradiated Nude Mice

This study was purposed to investigate the expansion and hematopoietic reconstitution capability of CD34(+)CD59(+) cells from patients with paroxysmal nocturnal hemoglobinuria (PNH) by using BALB/c nude mice so as to provide experimental basis for clinical anto-BMT or auto-PBHSCT in patients with PNH. CD34(+)CD59(+) cells were selected from the bone marrow mononuclear cells in normal persons and PNH patients by immunomagnetic positive double sorting and were engrafted sublethally irradiated BALB/c nude mice. The human CD45(+) cells in bone marrow, spleen and peripheral blood of recipient mice were detected by flow cytometry and DNA assay. The results showed that the CD34(+)CD59(+) cells in PNH patient group and normal person group could expanded ex vivo, but ex vivo expansion capability of CD34(+)CD59(+) cells in PNH patient group at day 7 seemed inferior to that in normal control. While CD34(+)CD59(+) cells of PNH patients and normal persons were transfused into recipient mice, the human CD45(+) cells could be detected in bone marrow, spleen and peripheral blood at 6 weeks after transfusion, but there was no statistical difference in counts of CD45 cells between 2 groups. It is concluded that CD34(+)CD59(+) cells from PNH patients may keep characteristics of normal hematopoietic stem cells, and possess ability to expand ex vivo and support hemopoiesis.