丁酸钠诱导人骨髓增生异常综合征细胞株SKM-1分化作用中细胞外信号调节激酶通路的改变

本研究探讨细胞外信号调节激酶（ERK）通路在丁酸钠（NaB）诱导人骨髓增生异常综合征细胞株SKM-1分化中的作用,阐明丁酸钠诱导SKM-1细胞分化的分子机制.用Western blot方法检测总ERK和磷酸化ERK的表达水平;将ERK特异性的抑制剂PD98059与丁酸钠联合应用,观察它们对SKM-1细胞生长曲线的影响及分化效应,并用Western blot方法检测P21和组蛋白脱乙酰酶（HDAC）蛋白质的表达水平.结果表明：SKM-1细胞经1mmol/L的丁酸钠作用后,总ERK的表达水平未发生变化,而磷酸化ERK的表达水平下降;丁酸钠及丁酸钠＋PD98059均可以上调P21和HDAC蛋白质的表达水平,且丁酸钠联合PD98059的作用强于丁酸钠单用.结论：ERK通路抑制是丁酸钠诱导SKM-1细胞分化的重要分子机制.

ERK Pathway Change in the Differentiation of Human MDS Cell Lines SKM-1 Induced by Sodium Butyrate

The study was purposed to investigate the role of extracellular signal-regulated kinase (ERK) pathway in the differentiation of human MDS cell lines SKM-1 induced by sodium butyrate (NaB), and to elucidate the molecular mechanism of differentiation in SKM-1 cells induced by NaB. The expression levels of total ERK and phosphorylated-ERK were determined by Western blot. The effect of NaB in combination with the ERK inhibitor PD98059 on the proli-feration/differentiation of SKM-1 cells was studied, and then the expression levels of the P21 and HDAC protein were detected by Western blot. The results showed that the expression level of phosphorylated ERK was down-regulated by the 1 mmol/L NaB, and the level of total ERK had not changed. NaB or combination of the MEK inhibitor PD98059 with NaB could increase the differentiation of the SKM-1 cells and up-regulated the levels of the P21 and HDAC protein, but the effect of combination of NaB with PD98059 was higher than that of NaB alone. It is concluded that the inhibition of ERK may be involved in sodium butyrate inducing differentiation in SKM-1 cells.