Transcriptional Activation of Placental Growth Factor by the Forkhead/Winged Helix Transcription Factor FoxD1

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• 作者：Hong Zhang ; Rachel Palmer ; Xiaobo Gao ; Jordan Kreidberg ; William Gerald ; Lili Hsiao ; Roderick V. Jensen ; Steven R. Gullans ; Daniel A. Haber
• 关键词：CELLBIO ; DNA ; RNA
• 刊名：Current Biology
• 出版年：2003
• 出版时间：16 September 2003
• 年：2003
• 卷：13
• 期：18
• 页码：1625-1629
• 全文大小：291 K

文摘

Stromal-epithelial interactions play an important role in renal organogenesis [1]. Expression of the forkhead/winged helix transcription factor FoxD1 (BF-2) is restricted to stromal cells in the embryonic renal cortex, but it mediates its effects on the adjacent ureteric bud and metanephric mesenchyme, which fail to grow and differentiate in BF-2 null mice [2]. BF-2 is therefore likely to regulate transcription of factors secreted by stromal cells that modulate the differentiation of neighboring epithelial cells. Here, we used cells with inducible expression of BF-2, combined with microarray analysis, to identify Placental Growth Factor (PlGF), a Vascular Endothelial Growth Factor (VEGF) family member previously implicated in angiogenesis, as a downstream target of BF-2. BF-2 binds to a conserved HNF3β site in the PlGF promoter and activates transcription. PlGF is precisely coexpressed with BF-2, both temporally and spatially, within the developing renal stroma, and it is completely absent in BF-2 null kidney stroma. Addition of PlGF to in vitro kidney organ cultures stimulates branching of the ureteric bud. Our observations indicate that PlGF is a direct and physiologically relevant transcriptional target of BF-2. The contribution of PlGF toward stromal signals that regulate epithelial differentiation suggests novel functions for a growth factor previously implicated in reactive angiogenesis.