Genomic vitamin D signaling in breast cancer: Insights from animal models and human cells.
These studies focus on identification of vitamin D regulated pathways that impact development or progression of breast cancer. In mouse experiments, we assessed genomic profiles of glandular tissue and established tumors from MMTV-neu mice fed adequate (250 IU/kg) or high (5000 IU/kg) vitamin D (cholecalciferol). Genomic profiles were also obtained in murine mammary cells that differentially express VDR that were cultured in vitro with 100 nM 1,25-dihydroxyvitamin D (1,25D). Ten candidate genes were identified that were commonly regulated in murine cells treated with 1,25D in vitro and in mammary gland of mice fed high dietary vitamin D. In complementary studies, the vitamin D pathway was evaluated in human mammary epithelial cells as a function of transformation. Genes regulated by 1,25D in human mammary epithelial cells included those involved in innate immunity (CD14), differentiation (Bmp6), extracellular matrix remodeling (Plau) and cell survival (Birc3). Transformation reduced VDR content and blunted the induction of some, but not all, target genes by 1,25D in human mammary cells. Collectively, these in vivo and in vitro data demonstrate that vitamin D signaling impacts on common pathways that drive differentiation, alter metabolism, remodel the extracellular matrix and trigger innate immunity in mammary tissue.
Matthews
Donald
D
Department of Biomedical Sciences, School of Public Health, State University of New York at Albany, Rensselaer, NY 12144, United States.
LaPorta
Erika
E
Zinser
Glendon M
GM
Narvaez
Carmen J
CJ
Welsh
Joellen
J
D000818:Animals; D001940:Breast / Q000378:metabolism; D001943:Breast Neoplasms / Q000378:metabolism*; D002112:Calcifediol / Q000378:metabolism*; D002454:Cell Differentiation; D002470:Cell Survival; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D007113:Immunity, Innate; D008321:Mammary Glands, Animal / Q000378:metabolism; D051379:Mice; D008954:Models, Biological; D018167:Receptors, Calcitriol / Q000378:metabolism; D015398:Signal Transduction
D018167:Receptors, Calcitriol; D002112:Calcifediol