title: CD4(+) T cells regulate pulmonary metastasis of mammary carcinomas by enhancing protumor properties of macrophages.
abstract: During breast cancer development, increased presence of leukocytes in neoplastic stroma parallels disease progression; however, the functional significance of leukocytes in regulating protumor versus antitumor immunity in the breast remains poorly understood. Utilizing the MMTV-PyMT model of mammary carcinogenesis, we demonstrate that IL-4-expressing CD4(+) T lymphocytes indirectly promote invasion and subsequent metastasis of mammary adenocarcinomas by directly regulating the phenotype and effector function of tumor-associated CD11b(+)Gr1(-)F4/80(+) macrophages that in turn enhance metastasis through activation of epidermal growth factor receptor signaling in malignant mammary epithelial cells. Together, these data indicate that antitumor acquired immune programs can be usurped in protumor microenvironments and instead promote malignancy by engaging cellular components of the innate immune system functionally involved in regulating epithelial cell behavior.
authors: Department of Pathology, University of California, San Francisco, CA 94143, USA.
authors: David G
authors: DG
authors: DeNardo
authors: Jairo B
authors: JB
authors: Barreto
authors: Pauline
authors: P
authors: Andreu
authors: Lesley
authors: L
authors: Vasquez
authors: David
authors: D
authors: Tawfik
authors: Nikita
authors: N
authors: Kolhatkar
authors: Lisa M
authors: LM
authors: Coussens
mesh_terms: D000230:Adenocarcinoma / Q000276:immunology / Q000473:pathology / Q000556:secondary*; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000502:physiology*; D004815:Epidermal Growth Factor / Q000378:metabolism; D005260:Female; D015847:Interleukin-4 / Q000378:metabolism / Q000502:physiology; D008175:Lung Neoplasms / Q000276:immunology / Q000556:secondary*; D008264:Macrophages / Q000502:physiology*; D008325:Mammary Neoplasms, Experimental / Q000276:immunology / Q000473:pathology*; D051379:Mice; D008822:Mice, Transgenic; D022423:Myeloid Cells / Q000473:pathology; D010641:Phenotype; D015398:Signal Transduction; D018418:Th2 Cells / Q000378:metabolism
chemical_list: D015847:Interleukin-4; D004815:Epidermal Growth Factor