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Am J Pathol. 2009 Jan;174(1):248-55. doi: 10.2353/ajpath.2009.080576. Epub 2008 Nov 26.

Beta-catenin is a mediator of the response of fibroblasts to irradiation.

Author information

1
Program in Developmental and Stem Cell Biology, Hospital for Sick Children, Toronto, Canada.

Abstract

Radiation causes soft tissue complications that include fibrosis and deficient wound healing. beta-Catenin, a key component in the canonical Wnt-signaling pathway, is activated in fibrotic processes and wound repair and, as such, could play a role in mediating cellular responses to irradiation. beta-Catenin can form a transcriptionally active complex with members of the Tcf family. A reporter mouse model, in addition to human cell cultures, was used to demonstrate that ionizing radiation activates beta-catenin-mediated, Tcf-dependent transcription both in vitro and in vivo. Furthermore, radiation activates beta-catenin via a Wnt-mediated mechanism, as in the presence of dickkopf-1, an inhibitor of Wnt receptor activation, beta-catenin levels did not increase after irradiation. Fibroblast cell cultures were derived from mice expressing either null or stabilized beta-catenin alleles. Cells expressing stabilized beta-catenin alleles had a higher proliferation rate and formed more colony-forming units than wild-type or null cells after irradiation. Wound healing was studied in these same mice after irradiation. There was a positive correlation between the tensile strength of the wound, the expression levels of type 1 collagen in the skin, and beta-catenin levels. Mice treated with lithium showed increased beta-catenin levels and increased wound strength. beta-Catenin mediates the effects of ionizing radiation in fibroblasts, and its modulation has the potential to decrease the severity of radiation-induced soft tissue complications.

PMID:
19036807
PMCID:
PMC2631337
DOI:
10.2353/ajpath.2009.080576
[Indexed for MEDLINE]
Free PMC Article

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