WNT unrelated activities in commercially available preparations of recombinant WNT3a.

Abstract:

:WNT signaling pathways play an important role in both development and disease. By analyzing the signaling capabilities of commercially available WNT3a preparations towards the PI3K/AKT/GSK3 signaling pathway, we discovered unexpected inconsistencies from lot to lot of recombinant WNT3a. We provide evidence that: (1) The ability to trigger AKT/GSK3 signaling varies dramatically between different lots of WNT3a, without any variation in their ability to activate the canonical WNT/β-catenin signaling. (2) sFRP1, a WNT signaling inhibitor, is unable to interfere with the activation of AKT/GSK3 signaling induced by some of the WNT3a lots. (3) Pharmacological inhibition of AKT/GSK3 phosphorylation by PI3K inhibitors fails to affect the stabilization of β-catenin, the central effector of the canonical WNT/β-catenin signaling pathway. In summary, while all tested lots of recombinant WNT3a activated WNT/β-catenin pathway, our results suggest that individual lots of recombinant WNT3a activate the PI3K/AKT/GSK3 pathway in a WNT-independent manner, hampering thus the analysis of regulation of PI3K/AKT/GSK3 by WNT ligand.

journal_name

J Cell Biochem

authors

Cajanek L,Adlerz L,Bryja V,Arenas E

doi

10.1002/jcb.22771

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

1077-9

issue

5

eissn

0730-2312

issn

1097-4644

journal_volume

111

pub_type

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