黄芪多糖对粒单核系造血细胞的抗凋亡作用

本研究探讨黄芪多糖（astragalus polysaccharide,ASPS）体外对骨髓粒单核前体细胞的增殖作用和对HL-60细胞株凋亡的影响及其可能的作用机理.观察不同浓度（0,50,100,200 μg/ml）的黄芪多糖和TPO（100 ng/ml）对骨髓集落形成单位CFU-GM和HL-60集落生成的影响.用无胎牛血清（或1％）的改良型RPMI 1640培养液诱导HL-60细胞凋亡,加入或者不加入黄芪多糖共培养72 h后,进行细胞计数并用Annexin V/PI双标记流式细胞术检测凋亡指标Caspase-3和JC-1的表达,并与正常组比较.结果表明,黄芪多糖（100,200 μg/ml）与TPO在体外能明显促进人骨髓细胞集落CFU-GM形成,同时黄芪多糖（50,100 μg/ml）也能促进HL-60细胞集落生成且其最大作用浓度为100 μg/ml,未发现其与TPO具有协同促进增殖的作用.无胎牛血清的RPMI 1640培养液能降低HL-60细胞的增殖,诱导细胞凋亡.HL-60细胞经黄芪多糖作用72 h后,与对照组相比细胞计数明显上升,由19×104个上升到34×104个（P＜0.05）,caspase-3表达相对于对照组明显下降,分别由10.5％,14.1％降至7.2％（P＜0.05）,7.8％（P＜0.05）.结论：黄芪多糖和TPO均能促进骨髓CFU-GM和HL-60细胞集落的生成；在无胎牛血清RPMI 1640培养液诱导细胞凋亡的情况下,黄芪多糖显著减少HL-60细胞的凋亡,保护HL-60细胞.

Anti-apoptotic Effect of Astragalus Polysaccharide on Myeloid Cells

This study was aimed to assess the effect of Astragalus Polysaccharide （ASPS） on in-vitro hematopoiesis. CFU-GM assays were used to determine the effect of ASPS and thrombopoietin（TPO） on granulocytic-monocyte progeni- tor cells. The CFU assays were also used to investigate the effect of ASPS on the proliferation of HL-60 cells. HL-60 cells were cultured with serum-free RPMI 1640 medium and treated with or without of different concentrations of ASPS. After 72 h incubation, the number of cells were counted. In addition, the caspase-3 and JC-1 expression was determined by flow cytometvy with Annexin V/PI double staining. The results showed that ASPS （ 100, 200 Izg/ml） and TPO （ 100 ng/ml） significantly promoted CFU-GM formation in vitro. Various concentrations of ASPS and TPO also promoted the colony formation of HL-60 cells ,the largest effect of ASPS was observed at a concentration of 100 tzg/ml. There were no synergistic effects between TPO and ASPS on cellular proliferation. The results also showed that ASPS significantly pro- tected HL-60 cells from apoptosis in condition of serum-free medium culture, suppressed caspase 3 activation, and reduced the cell apoptosis. It is concluded that ASPS can significantly promote the formation of bone marrow CFU-GM and the proliferation of HL-60 cells, the optimal concentration of ASPS is at 100 txg/ml. In the absence of serum inducing apop- tosis, ASPS also significantly reduced the apoptosis of HL-60 cells via suppressing the activation of caspase-3.