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PMID:12857724

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Citation

Caricasole, A, Ferraro, T, Iacovelli, L, Barletta, E, Caruso, A, Melchiorri, D, Terstappen, GC and Nicoletti, F (2003) Functional characterization of WNT7A signaling in PC12 cells: interaction with A FZD5 x LRP6 receptor complex and modulation by Dickkopf proteins. J. Biol. Chem. 278:37024-31

Abstract

WNT factors represent key mediators of many processes in animal development and homeostasis and act through a receptor complex comprised of members of the Frizzled and low density lipoprotein-related receptors (LRP). In mammals, 19 genes encoding Wingless and Int-related factor (WNTs), 10 encoding Frizzled, and 2 encoding LRP proteins have been identified, but little is known of the identities of individual Frizzled-LRP combinations mediating the effects of specific WNT factors. Additionally, several secreted modulators of WNT signaling have been identified, including at least three members of the Dickkopf family. WNT7A is a WNT family member expressed in the vertebrate central nervous system capable of modulating aspects of neuronal plasticity. Gene knock-out models in the mouse have revealed that WNT7A plays a role in cerebellar maturation, although its function in the development of distal limb structures and of the reproductive tract have been more intensely studied. To identify a receptor complex for this WNT family member, we have analyzed the response of the rat pheochromocytoma cell line PC12 to WNT7A. We find that PC12 cells are capable of responding to WNT7A as measured by increased beta-catenin stability and activation of a T-cell factor-based luciferase reporter construct and that these cells express three members of the Frizzled family (Frizzled-2, -5, and -7) and LRP6. Our functional analysis indicates that WNT7A can specifically act via a Frizzled-5.LRP6 receptor complex in PC12 cells and that this activity can be antagonized by Dickkopf-1 and Dickkopf-3.

Links

PubMed Online version:10.1074/jbc.M300191200

Keywords

Animals; Intercellular Signaling Peptides and Proteins; Low Density Lipoprotein Receptor-Related Protein-6; PC12 Cells; Proteins/physiology; Proto-Oncogene Proteins; Rats; Receptors, Cell Surface/physiology; Receptors, LDL/physiology; Signal Transduction/physiology; Wnt Proteins

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

HUMAN:LRP6

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:DKK3

involved_in

GO:0090090: negative regulation of canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:DKK2

involved_in

GO:0090263: positive regulation of canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:WNT7A

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:WNT7A

enables

GO:0005102: signaling receptor binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:Q13467

F

Seeded From UniProt

complete

HUMAN:WNT7A

involved_in

GO:0060070: canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:DKK1

involved_in

GO:0090090: negative regulation of canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FZD5

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FZD5

involved_in

GO:0060070: canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:FZD5

enables

GO:0017147: Wnt-protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:O00755

F

Seeded From UniProt

complete

HUMAN:LRP5

involved_in

GO:0060070: canonical Wnt signaling pathway

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

HUMAN:LRP5

involved_in

GO:0045944: positive regulation of transcription by RNA polymerase II

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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