NRF4转染对横纹肌肉瘤RD细胞分化及生肌调节因子表达的影响

为观察MRF4转染对人横纹肌肉瘤RD细胞分化及生肌调节因子MyoD表达的影响,利用脂质体法将MRF4转染人横纹肌肉瘤RD细胞,原位杂交检测MRF4、MyoD mRNA的表达,观察细胞形态、生长速度变化,并采用免疫细胞化学方法检测横纹肌肌球蛋白重链及肌动蛋白α-actin表达。结果显示,转染后RD细胞形态向高分化方向变化,生长受抑;MRF4、MyoD表达明显增加;细胞肌球蛋白重链和肌动蛋白α-actin表达显著增强。提示MRF具有促进RD细胞分化的作用,并可激活另一生肌调节因子MyoD的表达。

EFFECTS OF MRF4 TRANSFECTION ON DIFFERENTIATION AND EXPRESSION OF MYOGENIC REGULATORY FACTORS IN CULTERED HUMAN RHABDOMYOSARCOMA RD CELLS

To study the effects of MRF4 transfection on differentiation and expression of myogenic regulatory factors of human rhabdomyosarcoma RD cells, the plasmid-MRF4 cDNA was transfected into cultured rhabdomyosarcoma RD cells with lipofectin method. The myogenic regulatory factors MRF4 and MyoD mRNA were measured with in situ hybridization and the expressions of myosin heavy chain(MHC) and a-actin in the cells were assayed with immunocytochemical method. The cell growth and morphology were observed at the same time. It was found that the morphology of differentiation increased and the growth was suppressed in RD cells after transfection. The expression of MHC and a-actin were significantly increased in RD cells after transfection, while the expressions of MRF4 and MyoD mRNA were up-regulated. It is suggested that transfection of MRF4 can induce differentiation of RD cells and up-regulate the expression of MyoD.