去甲斑蝥素对环磷酰胺诱导的白细胞减少症模型大鼠骨髓造血功能的影响

Effect of Norcantharidin on Hematopoietic Function in Leucopenia Model Rat Induced by Cyclophosphamide

目的:探讨去甲斑蝥素(NCTD)对环磷酰胺(CTX)诱导的白细胞减少症模型大鼠骨髓造血的影响及机制。方法:采用CTX腹腔注射法复制白细胞减少症模型,以NCTD干预模型大鼠,全自动血细胞分析仪检测外周血白细胞(WBC)数量,骨髓组织作切片HE染色观察病理改变,流式细胞术检测骨髓细胞增殖周期、凋亡率,免疫组织化学法检测骨髓组织中凋亡相关蛋白BCL-2、BAX的表达。结果:NCTD干预白细胞减少症模型后,外周血WBC显著升高;模型大鼠骨髓骨髓组织结构破坏,造血细胞明显减少,NCTD干预后促进骨髓组织细胞结构显著恢复;NCTD可促使白细胞减少症模型大鼠骨髓细胞增殖及周期的转化,显著抑制CTX所诱导的骨髓细胞凋亡与坏死,上调抑凋亡蛋白BCL-2表达,下调促凋亡蛋白BAX的表达。结论:NCTD可刺激CTX诱导的白细胞减少症模型大鼠骨髓造血,促进外周血白细胞水平的恢复,其机制可能与NCTD调控骨髓细胞周期、抑制细胞凋亡等有关。

Objective： To explore the effect and mechanism of norcantharidin （NCTD） on hematopoiesis function in leucopenia model rat induced by cyclophosphamide（CTX）. Methods： Leucopenia model was replicated in SD rat with cyclophosphamide（CTX） and model animal was treated with NCTD. Peripheral blood and bone marrow tissue samples were collected from the rats in each experimental group. Peripheral white blood cells（WBC） were counted and analyzed by automatic blood cell analyzer. Histopathologic changes of the biopsied bone marrow tissues were observed by histopathological techniques, The cell cycle and apoptosis rate of bone marrow cells were detected by flow cytometry. Immunohistochemical method was applied to observe the expression of apoptosis-related proteins BCL-2 and BAX in bone marrow. Results：After NCTD treatment in model rats, the WBC count of peripheral blood obviously increased, the cell structure of bone tissue significantly recovered, NCTD could promote the cell proliferation and cycle changes of bone marrow cells, inhibit the bone marrow cell apoptosis and necrosis induced with CTX, up-regulate the expression of apoptosis-related protein BCL-2 and downregulated the BAX. Conclusion： NCTD can stimulate the bone marrow hematopoiesis and promote recovery of peripheral white blood cell level in the leukopenia model induced by CTX, and its mechanism may be related with NCTD regulating bone marrow cell cycle and with NCTD inhibiting cell apoptosis.