AMD3100联合地塞米松对造血干细胞的动员作用

摘要

BACKGROUND:The number of hematopoietic stem cel s in the peripheral blood is very low at normal physiological state. So it is critical to mobilize hematopoietic stem cel s from donor’s bone marrow into the peripheral blood. OBJECTIVE:To study the combination effect of AMD3100 and dexamethasone on the mobilization of hematopoietic stem cel s in mice, thereby laying the foundation for clinical application. METHODS:C57BL/6 mice were injected with AMD3100 and dexamethasone alone or in combination. Then, hematopoietic stem cel s in the peripheral blood and bone marrow were col ected. CD34+cel concentration in the peripheral blood and bone marrow was determined by flow cytometer and the content of leucocytes in the peripheral blood was counted by a normal method. The CFU-Mix colony formation ability of hematopoietic stem cel s was identified by cel colony forming assay. RESULTS AND CONCLUSION:The concentration of CD34+cel s in the peripheral blood and bone marrow, the content of leukocytes in the peripheral blood and the CFU-Mix colony formation ability of hematopoietic stem cel s were al improved by both AMD3100 and dexamethasone and especial y their combined use. This indicates that both AMD3100 and dexamethasone could mobilize hematopoietic stem cel s to migrate from the bone marrow to the peripheral blood, and when used in combination, the mobilization effect is better than that of single drug.%背景：正常状态下外周血中的干细胞数量很低，将供者骨髓中的造血干细胞动员到外周血是造血干细胞移植的关键。　　目的：探索AMD3100和地塞米松联合用药对小鼠造血干细胞的动员效果，为临床应用奠定基础。　　方法：选用C57BL/6小鼠，单独或者联合注射AMD3100和地塞米松后采集外周血和骨髓造血干细胞，使用流式细胞仪鉴定外周血和骨髓中CD34+细胞的含量，常规方法计数外周血白细胞含量，集落形成实验计数外周血和骨髓中造血干细胞粒-巨噬细胞混合集落形成单位。　　结果与结论：①AMD3100和地塞米松均可刺激外周血和骨髓中CD34+细胞含量上升，分别在4 h和2 h时达到高峰，当联合使用AMD3100和地塞米松时，外周血和骨髓中CD34+细胞含量上升幅度最大；②AMD3100或地塞米松均可刺激外周血中白细胞含量上升，AMD3100和地塞米松联合动员的外周血白细胞含量高于其他组；③AMD3100动员后外周血和骨髓中造血干细胞粒-巨噬细胞混合集落形成数量显著高于对照组，AMD3100和地塞米松联合动员的外周血和骨髓中造血干细胞粒-巨噬细胞混合集落形成数高于单用AMD3100或地塞米松动员组；④AMD3100或地塞米松能够动员造血干细胞从骨髓向外周血迁移，两者联合应用对小鼠造血干细胞动员效果优于单一药物。