jumonji Downregulates Cardiac Cell Proliferation by Repressing cyclin D1 Expression

详细信息    查看全文

• 作者：Masashi Toyoda ; Haruki Shirato ; Kuniko Nakajima ; Mizuyo Kojima ; Miho Takahashi ; Misae Kubota ; Rika Suzuki-Migishima ; Yoshiko Motegi ; Minesuke Yokoyama ; Takashi Takeuchi
• 关键词：CELLBIO ; CELLCYCLE
• 刊名：Developmental Cell
• 出版年：2003
• 出版时间：July 2003
• 年：2003
• 卷：5
• 期：1
• 页码：85-97
• 全文大小：822 K

文摘

Spatiotemporal regulation of cell proliferation is necessary for normal tissue development. The molecular mechanisms, especially the signaling pathways controlling the cell cycle machinery, remain largely unknown. Here, we demonstrate a negative relationship between the spatiotemporal patterns of jumonji (jmj) expression and cardiac myocyte proliferation. cyclin D1 expression and cell proliferation are enhanced in the cardiac myocytes of jmj-deficient mutant embryos. In contrast, jmj overexpression represses cyclin D1 expression in cardiac cells, and Jmj protein binds to cyclin D1 promoter in vivo and represses its transcriptional activity. cyclin D1 overexpression causes hyperproliferation in the cardiac myocytes, but the absence of cyclin D1 in jmj mutant embryos rescues the hyperproliferation. Therefore, Jmj might control cardiac myocyte proliferation and consequently cardiac morphogenesis by repressing cyclin D1 expression.