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上海士鋒關于MLL-ENL促進造血干細胞的分化
點擊次數:935 發布時間:2013-5-1

由于ENL和CBX8結合,造成CBX8無法抑制轉錄延長
轉錄延長的發生是造成白血病的主要原因,而MLL是造成轉錄延長的關鍵。此項研究表明,MLL-ENL融合蛋白同樣可以抑制調停基因表達的PRC1的活性,從而促進造血干細胞的分化。
生化研究表明,融合蛋白MLL-ENL的ENL會抑制PRC1的CBX8的活性。ENL和CBX8之間的關系是特異專一的。CBX8會抑制轉錄延長,但是由于ENL的作用,造成CBX8無法發揮作用。但是同時,無法結合CBX8的MLL-ENL融合蛋白無法有效地激活基因位點,而激活基因位點對于造血干細胞的分化是必須的。
此項研究表明,MLL-ENL融合蛋白可能會加強對于抑制基因表達的PRC1的抑制,同時促進造血干細胞的分化,并導致白血病的發生。
MLL-ENL Inhibits Polycomb Repressive Complex 1 to Achieve Efficient Transformation of Hematopoietic Cells
Emanuel Maethner,Maria-Paz Garcia-Cuellar,Constanze Breitinger,Sylvia Takacova,Vladimir Divoky,Jay L. Hess,Robert K. Slany
Stimulation of transcriptional elongation is a key activity of leukemogenic MLL fusion proteins. Here, we provide evidence that MLL-ENL also inhibits Polycomb-mediated silencing as a prerequisite for efficient transformation. Biochemical studies identified ENL as a scaffold that contacted the elongation machinery as well as the Polycomb repressive complex 1 (PRC1) component CBX8. These interactions were mutually exclusive in vitro, corresponding to an antagonistic behavior of MLL-ENL and CBX8 in vivo. CBX8 inhibited elongation in a specific reporter assay