title: Wiskott-Aldrich syndrome protein regulates leukocyte-dependent breast cancer metastasis.
abstract: A paracrine interaction between epidermal growth factor (EGF)-secreting tumor-associated macrophages (TAMs) and colony-stimulating factor 1 (CSF-1)-secreting breast carcinoma cells promotes invasion and metastasis. Here, we show that mice deficient in the hematopoietic-cell-specific Wiskott-Aldrich syndrome protein (WASp) are unable to support TAM-dependent carcinoma cell invasion and metastasis in both orthotopic and transgenic models of mammary tumorigenesis. Motility and invasion defects of tumor cells were recapitulated ex vivo upon coculture with WASp(-/-) macrophages. Mechanistically, WASp is required for macrophages to migrate toward CSF-1-producing carcinoma cells, as well as for the release of EGF through metalloprotease-dependent shedding of EGF from the cell surface of macrophages. Our findings suggest that WASp acts to support both the migration of TAMs and the production of EGF, which in concert promote breast tumor metastasis.
authors.affiliation: Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
authors.forename: Dan
authors.initials: D
authors.lastname: Ishihara
authors.forename: Athanassios
authors.initials: A
authors.lastname: Dovas
authors.forename: Lorena
authors.initials: L
authors.lastname: Hernandez
authors.forename: Maria
authors.initials: M
authors.lastname: Pozzuto
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Wyckoff
authors.forename: Jeffrey E
authors.initials: JE
authors.lastname: Segall
authors.forename: John S
authors.initials: JS
authors.lastname: Condeelis
authors.forename: Anne R
authors.initials: AR
authors.lastname: Bresnick
authors.forename: Dianne
authors.initials: D
authors.lastname: Cox
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000502:physiology; D018450:Disease Progression; D005260:Female; D064593:Heterografts; D006801:Humans; D051379:Mice; D008822:Mice, Transgenic; D009362:Neoplasm Metastasis; D051381:Rats; D064726:Triple Negative Breast Neoplasms / Q000378:metabolism* / Q000473:pathology*; D051316:Wiskott-Aldrich Syndrome Protein / Q000235:genetics / Q000378:metabolism*
chemical_list: D051316:Wiskott-Aldrich Syndrome Protein
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