title: Wnt and mammary stem cells: hormones cannot fly wingless.
abstract: The mammary stem cell and its local microenvironment are central for the maintenance of proper tissue homeostasis during normal development. Defining the hierarchical organization of the epithelial subtypes in the mammary gland and the molecular pathways guiding their development has begun to provide a framework for understanding how cancer stem cells sustain the progression and heterogeneity of breast cancers. The Wnt pathway plays a fundamental role in multiple adult stem cells, as well as in orchestrating proper mammary gland development and maintenance. These processes are intricately guided by the influence of systemic hormones and local factors. Alterations in Wnt signaling can skew the homeostatic balance of the mammary epithelium to drive malignant progression; however, complexities of Wnt pathway components present a challenge in understanding their physiological function.
authors.affiliation: Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030-3498, USA.
authors.forename: Kevin
authors.initials: K
authors.lastname: Roarty
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Rosen
mesh_terms: D000818:Animals; D001940:Breast / Q000166:cytology / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology; D015536:Down-Regulation; D004848:Epithelium / Q000378:metabolism; D047628:Estrogen Receptor alpha / Q000378:metabolism; D005260:Female; D006728:Hormones / Q000378:metabolism / Q000502:physiology; D006801:Humans; D026502:LDL-Receptor Related Proteins / Q000378:metabolism; D060492:Low Density Lipoprotein Receptor-Related Protein-5; D060488:Low Density Lipoprotein Receptor-Related Protein-6; D008321:Mammary Glands, Animal / Q000166:cytology / Q000378:metabolism*; D042361:Mammary Glands, Human / Q000378:metabolism / Q000502:physiology / Q000503:physiopathology*; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D011980:Receptors, Progesterone / Q000378:metabolism; D015398:Signal Transduction; D013234:Stem Cells / Q000378:metabolism* / Q000473:pathology; D051153:Wnt Proteins / Q000378:metabolism*; D051176:beta Catenin / Q000378:metabolism*
chemical_list: D047628:Estrogen Receptor alpha; D006728:Hormones; D026502:LDL-Receptor Related Proteins; C555482:LRP5 protein, human; C555475:LRP6 protein, human; D060492:Low Density Lipoprotein Receptor-Related Protein-5; D060488:Low Density Lipoprotein Receptor-Related Protein-6; D011980:Receptors, Progesterone; D051153:Wnt Proteins; D051176:beta Catenin
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