骨髓瘤细胞抑制成骨细胞活性和Runx2表达

目的 建立MM细胞系(U266细胞株)和MSCs共培养体系,研究骨髓瘤细胞对MSCs增殖能力、OB形成能力和Runx2表达的影响.方法 研究对象为2例缺铁性贫血和1例特发性血小板减少性紫癜.采用密度梯度离心结合贴壁培养法分离纯化骨髓MSCs,培养3-5代后,诱导MSCs向OB分化,待细胞融合至60％～70％时,分两组,一组加U266细胞株共同培养(共培养组),另一组不加U266细胞株(对照组).采用CCK-8试剂盒检测MSCs向OB分化过程中的增殖能力,以平均光密度值(AOD)表示；碱性磷酸酶(ALP)染色和钙结节(Von-Kcssa)染色检测MSCs的OB形成能力,分别以IOD sum/Area sum值和平均钙结节个数表示；RT-PCR技术检测MSCs向OB分化过程中Runx2的表达,以Runx2/GAPDH平均光密度值表示.结果 在共培养体系中,U266细胞株和MSCs共培养的前3d,MSCs增殖能力无明显变化,两组AOD值分别为0.731±0.020和0.805±0.152(P ＞0.05),至第6天,共培养组的MSCs增殖能力明显低于对照组,AOD分别为0.560±0.034和2.283±0.145(P ＜0.05).与对照组相比,共培养组MSCs向OB分化过程中ALP的表达显著降低,IOD sum/Area sum值分别为0.138±0.038和0.376±0.044(P ＜0.01),钙结节的形成减少,平均钙结节个数分别为(6.7±2.75)个和(15.3±8.99)个(P＜0.01)和Runx2的表达显著降低,Runx2/GAPDH平均光密度值分别为0.238±0.168和0.653 ±0.343(P ＜0.01).结论 骨髓瘤细胞可抑制骨髓MSCs向OB分化的增殖能力和OB形成能力,也抑制其Runx2表达.

have a Inhibitory effect of myeloma cells on osteoblast activity and Runx2 expression

Objective To investigate the effect of myeloma cells line(U266) on proliferation,osteoblast formation and Runx2 expression of MSCs when cocultured with U266 cell lines.Methods Bone marrow was collected from 2 patients with iron deficiency anemia and 1 with idiopathic thrombocytopenic purpura.At the passage 3 to 5,MSCs were induced to differentiate into OB in L-DMEM conditioned medium.MSCs were divided into two groups when they are fusion 60% to 70%,one group was cocultured with U266 cell line(coculture grou...