WNT/beta-catenin Mediates Radiation Resistance of Mouse Mammary Progenitor Cells

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2007 Jan 5

PMID 17202265

Citations 309

Authors

Wendy A Woodward

Mercy S Chen

Fariba Behbod

Maria P Alfaro

Thomas A Buchholz

Jeffrey M Rosen

Affiliations

Soon will be listed here.

Abstract

Recent studies have identified a subpopulation of highly tumorigenic cells with stem/progenitor cell properties from human breast cancers, and it has been suggested that stem/progenitor cells, which remain after breast cancer therapy, may give rise to recurrent disease. We hypothesized that progenitor cells are resistant to radiation, a component of conventional breast cancer therapy, and that that resistance is mediated at least in part by Wnt signaling, which has been implicated in stem cell survival. To test this hypothesis, we investigated radioresistance by treating primary BALB/c mouse mammary epithelial cells with clinically relevant doses of radiation and found enrichment in normal progenitor cells (stem cell antigen 1-positive and side population progenitors). Radiation selectively enriched for progenitors in mammary epithelial cells isolated from transgenic mice with activated Wnt/beta-catenin signaling but not for background-matched controls, and irradiated stem cell antigen 1-positive cells had a selective increase in active beta-catenin and survivin expression compared with stem cell antigen 1-negative cells. In clonogenic assays, colony formation in the stem cell antigen 1-positive progenitors was unaffected by clinically relevant doses of radiation. Radiation also induced enrichment of side population progenitors in the human breast cancer cell line MCF-7. These data demonstrate that, compared with differentiated cells, progenitor cells have different cell survival properties that may facilitate the development of targeted antiprogenitor cell therapies.

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