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Cancer stem cells (CSCs) can avoid or efficiently repair DNA damage from radio and chemotherapy, which suggests they play a role in disease recurrence. Twenty percentage of patients treated with surgery and radiotherapy for ductal carcinoma in situ (DCIS) of the breast recur and our previous data show that high grade DCIS have increased numbers of CSCs. Here, we investigate the role of focal adhesion kinase (FAK) and Wnt pathways in DCIS stem cells and their capacity to survive irradiation. Using DCIS cell lines and patient samples, we demonstrate that CSC-enriched populations are relatively radioresistant and possess high FAK activity. Immunohistochemical studies of active FAK in DCIS tissue show high expression was associated with a shorter median time to recurrence. Treatment with a FAK inhibitor or FAK siRNA in nonadherent and three-dimensional matrigel culture reduced mammosphere formation, and potentiated the effect of 2 Gy irradiation. Moreover, inhibition of FAK in vitro and in vivo decreased self-renewal capacity, levels of Wnt3a and B-Catenin revealing a novel FAK-Wnt axis regulating DCIS stem cell activity. Overall, these data establish that the FAK-Wnt axis is a promising target to eradicate self-renewal capacity and progression of human breast cancers.

Type

Journal article

Journal

Stem cells (Dayton, Ohio)

Publication Date

02/2015

Volume

33

Pages

327 - 341

Addresses

Surgical Oncology, University Hospital of South Manchester NHS Foundation Trust, Wythenshawe Hospital, Education and Research Centre, Manchester, United Kingdom; Cancer Stem Cell Research, University of Manchester, Institute of Cancer Sciences, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, Manchester, United Kingdom.

Keywords

Cell Line, Tumor, Animals, Humans, Mice, Mice, Nude, Carcinoma, Ductal, Breast, Breast Neoplasms, Neoplasm Proteins, RNA, Small Interfering, Gene Expression Regulation, Neoplastic, Radiation Tolerance, Female, beta Catenin, Focal Adhesion Kinase 1, Neoplastic Stem Cells, Wnt3A Protein, Wnt Signaling Pathway