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J Cell Biol. 2008 Sep 8;182(5):865-72. doi: 10.1083/jcb.200803147. Epub 2008 Sep 1.

Caprin-2 enhances canonical Wnt signaling through regulating LRP5/6 phosphorylation.

Author information

1
State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.

Abstract

The low-density lipoprotein receptor-related proteins 5 and 6 (LRP5/6) are coreceptors for Frizzled and transmit signals from the plasma membrane to the cytosol. However, the mechanism for LRP5/6 signal transmission remains undefined. Here, we identify cytoplasmic activation/proliferation-associated protein 2 (Caprin-2) as a LRP5/6-binding protein. Our data show that Caprin-2 stabilizes cytosolic beta-catenin and enhances lymphoid enhancer-binding factor 1/T cell factor-dependent reporter gene activity as well as the expression of Wnt target genes in mammalian cells. Morpholino-mediated knockdown of Caprin-2 in zebrafish embryos inhibits Wnt/beta-catenin signaling and results in a dorsalized phenotype. Moreover, Caprin-2 facilitates LRP5/6 phosphorylation by glycogen synthase kinase 3, and thus enhances the interaction between Axin and LRP5/6. Therefore, Caprin-2 promotes activation of the canonical Wnt signaling pathway by regulating LRP5/6 phosphorylation.

PMID:
18762581
PMCID:
PMC2528581
DOI:
10.1083/jcb.200803147
[Indexed for MEDLINE]
Free PMC Article

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