Jun二聚化蛋白-2(Jun dimerization protein-2,JDP2)是转录因子复合体AP-1的抑制性组分。JDP2能形成同源二聚体或与c-Jun、JunB、JunD、ATF-2等形成异源二聚体,抑制AP-1的转录激活作用。同时JDP2还能募集组蛋白去乙酰基酶,或直接与组蛋白结合,抑制组蛋白的乙酰化,通过改变染色质结构调控基因转录。J D P2通过在D N A、染色质多个水平调控基因的转录,在细胞的多种生理或病理活动中发挥着重要作用。
c-Jun dimerization protein JDP2 is a member of the AP-1 family that serves as a repressor in gene transcription. To study the role of JDP2 in neuroblastoma cells, we have established a stably trans- fected SH-SY5Y cell line that carries jdp2 gene. Our results showed that JDP2 could promote neuronal differentiation of SH-SY5Y cells. The SY5Y-JDP2 cells exhibited lower percentage of cells in S phase and retarded growth rate than its parental cells that were accompanied by a higher expression of p21 and an intense reduction of the cyclin D1. In conclusion, the inhibitory role of JDP2 on neuroblastoma cell growth could be critical for the cells to be withdrawn from cell cycle and to proceed differentiation.
