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REVIEW |
Department of Cell Biology, University of Alabama at Birmingham, 1918 University Boulevard, Birmingham, AL 35294-0005, USA
(Requests for offprints should be addressed to R Serra; Email: rserra{at}uab.edu)
(Present address of M R Crowley is Department of Genetics, University of Alabama, Birmingham, 720 20th Street South, Birmingham, AL 35294-0024, USA)
It is now recognized that transforming growth factor ß (TGF-ß) is an important factor that regulates normal breast development as well as breast cancer. Genetically engineered mouse models have been used to determine the role and mechanism of TGF-ß action in normal development and diseases of the breast. Using these models, it has been determined that TGF-ß regulates many steps of normal mammary gland development including branching morphogenesis, functional differentiation, cell-lineage decisions, and involution. Effects of TGF-ß on normal development are mediated through signaling in both the epithelial and stromal compartments. In cancer, mouse models have indicated that TGF-ß has biphasic effects on tumor progression, acting as a tumor suppressor in early stages of cancer and promoting invasion and metastasis at later stages. In addition, TGF-ß may play a role in tumor progression through effects on the microenvironment. Recently, experiments in several mouse models have suggested that antagonism of TGF-ß signaling may provide a therapeutic target for late-stage breast cancer, blocking metastasis without detrimental side effects. In the future, genetically altered mice will be used to establish models of human breast disease providing opportunities to test strategies for disease prevention and treatment.
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