地西他滨联合曲古抑菌素A对MDS细胞株SKM-1作用的体外研究

本研究探讨去甲基化制剂地西他滨（decitabine）和（或）组蛋白去乙酰化酶抑制剂曲古抑菌素A（TSA）对MDS—RAEB细胞株SKM—1的影响及作用机制．用台盼蓝拒染法研究药物对SKM—1细胞生长曲线的影响；用四氮唑蓝还原试验和流式细胞术观察药物对SKM—1细胞分化作用；用Annexin V—FITC标记药物作用后的细胞，了解其早期凋亡的情况；用RT—PCR研究药物作用前后细胞Fas，survivin和P15^INK4B。基因表达的变化。结果表明：decitabine和（或）TSA对SKM—1细胞生长有抑制作用，能促进SKM—1细胞分化，细胞表面CD14、CD11b表达增加，HLA—DR表达减少；decitabine和（或）TSA处理SKM—1细胞后，SKM—1细胞凋亡增加，细胞Fas和P15^INK4B mRNA表达增加，survivin mRNA表达减少。结论：decitabine和TSA均可以促进SKM—1细胞凋亡和分化，可能与Fas、P15^INK4B和survivin基因表达有关，二者联用有协同作用。

Effect of Decitabine Combined with Trichostatin A on MDS Cell line SKM-1 In Vitro

The study was purposed to explore the effect and mechanisms of decitabine and/or Trichostatin A (TSA) on SKM-1 cells in vitro. The effect of decitabine and/or TSA on proliferation of SKM-1cells was analyzed with trypan blue exclusion; the differentiation of SKM-1 cells was detected by nitro-blue tetrazolium (NBT) reduction and flow cytometry; the apoptosis of cells was measured by Annexin V-FITC; the mRNA expression of Fas, survivin and P15(INK4B) in cells treated with decitabine and/or TSA was evaluated by RT-PCR. The results showed that decitabine and/or TSA were capable of inhibiting SKM-1 cell growth and promoting cell differentiation; they stimulated the expression of CD14 and CD11b and inhibited HLA-DR expression; meanwhile and decitabine or/and TSA could induce cell apoptosis, up-regulate mRNA expression of Fas and P15(INK4B), and down-regulate survivin mRNA expression. It is concluded that decitabine can induce apoptosis/differentiation of SKM-1 cells, whose mechanisms may related to the expression of Fas, survivin and P15(INK4B). Decitabine has the synergistic effect with TSA.