Gene profiling of frizzled-1 and frizzled-2 signaling: Expression of G-protein-coupled receptor chimeras in mouse F9 teratocarcinoma embryonal cells

被引:17
作者
Li, H
Malbon, CC [1 ]
Wang, HY
机构
[1] SUNY Stony Brook, Hlth Sci Ctr, Dept Pharmacol, Stony Brook, NY 11794 USA
[2] SUNY Stony Brook, Hlth Sci Ctr, Dept Physiol & Biophys, Stony Brook, NY 11794 USA
关键词
D O I
10.1124/mol.65.1.45
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
Wnt-Frizzled signaling via heterotrimeric G-proteins controls various aspects of early development. Because Wnts may activate more than one Frizzled, understanding the downstream signaling mechanisms and target genes for Frizzled activation has been a challenge. We constructed functional, chimeric receptors with the ligand-binding and transmembrane segments from the beta(2)-adrenergic receptor and the cytoplasmic domains from either rat Frizzled-1 (Rfz1) or Frizzled-2 (Rfz2). Activation with beta-agonist enables stimulation of only a single Frizzled pathway and profiling of genes targeted by this Frizzled-specific approach. Genes activated in mouse totipotent F9 teratocarcinoma cells solely by activation of the Rfz1 chimera include Lefty1, STAM, JAB, Erk1, MyD118, Fcer Ig, and follistatin, genes implicated in development. Stimulation of Rfz2 chimera, but not Rfz1, leads to activation of a smaller set of genes, including those for REST/NRSF, Groucho, nucleophosmin, and Ubc4/5E2. Activation of either Rfz1- or Rfz2-specific chimera leads, in these totipotent stem cells, to some differential activation of a common set of genes, including those for Msx-1, Msx-2, CBP/P300-associated factor, ephrin A3, and Nip-3. We demonstrate the utility of beta(2)-adrenergic receptor-Frizzled chimeras to provide the tools with which to activate and to probe Frizzled-specific downstream signaling to gene activation.
引用
收藏
页码:45 / 55
页数:11
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