期刊
BIOCHEMISTRY
卷 48, 期 43, 页码 10267-10274出版社
AMER CHEMICAL SOC
DOI: 10.1021/bi9009677
关键词
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资金
- National Institutes of Health [5R01 CA 113656-03]
- Pediatric Brain'Fumor Foundation
- Susan G, Komen for the Cure
- Alexander and Margaret Stewart Trust Fund
- Fred and Alice Stanback
- V Foundation
- American Cancer society
Wnt proteins bind to seven-transmembrane Frizzled receptors to mediate the important developmental, morphogenetic, and stem cell related tissue-regenerative effects of Writ signaling. Dysregulated Writ signaling is associated with many cancers. Currently, there are no drug candidates or even tool compounds that modulate Wnt-mediated receptor trafficking, and subsequent Writ signaling. We examined libraries of FDA-approved drugs for their utility as Frizzled internalization modulators, employing a primary imaged-based GFP fluorescence assay that uses Frizzled I endocytosis as the readout. We now report that the anti-helminthic niclosamide, a Doug used for the treatment of tapeworm, promotes Frizzled1 endocytosis, downregulates Dishevelled-2 protein, and inhibits Wnt3A-stimulated beta-catenin stabilization and LEF/TCF reporter activity. Additionally, following niclosamide-mediated internalization, the Frizzled1 receptor colocalizes in vesicles containing transferrin and agonist-activated beta(2)-adrenergic receptor. Therefore, niclosamide may serve as a negative modulator of Wnt/Frizzled1 signaling by depleting upstream signaling molecules (i.e., Frizzled and Dishevelled) and moreover may provide a valuable means of studying the physiological consequences of Wnt signaling.
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