A heat shock protein and Wnt signaling crosstalk during axial patterning and stem cell proliferation

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Title: A heat shock protein and Wnt signaling crosstalk during axial patterning and stem cell proliferation
Authors: Duffy, David J.
Millane, R. Cathriona
Frank, Uri
Permanent link: http://hdl.handle.net/10197/5069
Date: Feb-2012
Abstract: Both Wnt signaling and heat shock proteins play important roles in development and disease. As such, they have been widely, though separately, studied. Here we show a link between a heat shock protein and Wnt signaling in a member of the basal phylum, Cnidaria. A heat shock at late gastrulation in the clonal marine hydrozoan, Hydractinia, interferes with axis development, specifically inhibiting head development, while aboral structures remain unaffected. The heat treatment upregulated Hsc71, a constitutive Hsp70 related gene, followed by a transient upregulation, and long-term downregulation, of Wnt signaling components. Downregulating Hsc71 by RNAi in heat-shocked animals rescued these defects, resulting in normal head development. Transgenic animals, ectopically expressing Hsc71, had similar developmental abnormalities as heat-shocked animals in terms of both morphology and Wnt3 expression. We also found that Hsc71 is upregulated in response to ectopic Wnt activation, but only in the context of stem cell proliferation and not in head development. Hsc71's normal expression is consistent with a conserved role in mitosis and apoptosis inhibition. Our results demonstrate a hitherto unknown crosstalk between heat shock proteins and Wnt/β-catenin signaling. This link likely has important implications in understanding normal development, congenital defects and cancer biology.
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2012 Elsevier
Keywords: Hsc71;HSPA8;Hsc70;Hsp70;Hsp73;Wnt target gene;β-catenin;Tcf Development;Axis formation;Anteriorposterior patterning;Hydractinia;Cnidaria;RNAi;Metamorphosis;Organizer;Invertebrate;Apoptosis;Proliferation
DOI: 10.1016/j.ydbio.2011.11.014
Language: en
Status of Item: Peer reviewed
Appears in Collections:SBI Research Collection

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