Protein 4.1B Expression Is Induced in Mammary Epithelial Cells During Pregnancy and Regulates Their Proliferation
Oncogene (2005) 24, 6502–6515 & 2005 Nature Publishing Group All rights reserved 0950-9232/05 $30.00 www.nature.com/onc Protein 4.1B expression is induced in mammary epithelial cells during pregnancy and regulates their proliferation Robin Kuns1,2, Joseph L Kissil3, Irene F Newsham4, Tyler Jacks5, David H Gutmann6 and Larry S Sherman*,1 1Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, 505 NW 185th Ave., Beaverton, OR 97006, USA; 2Department of Cell Biology, Neurobiology & Anatomy, University of Cincinnati School of Medicine, Cincinnati, OH 45267, USA; 3Molecular and Cellular Oncogenomics Program, The Wistar Institute, Philadelphia, PA 19104, USA; 4Department of Neurosurgery, David and Doreen Hermelin Laboratory of Molecular Oncogenetics, Hermelin Brain Tumor Center, Henry Ford Hospital, Detroit, MI 48202, USA; 5Department of Biology and Center for Cancer Research, and Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; 6Department of Neurology, Washington University School of Medicine, St Louis, MO 63110, USA 4.1B is a member of the protein 4.1 superfamily of erythrocytes (Tyler et al., 1979). This superfamily proteins that link transmembrane proteins to the actin consists of five subgroups, including the 4.1 proteins cytoskeleton. The 4.1B gene localizes to chromosome (4.1R, 4.1N, 4.1G, 4.1O, and 4.1B) and the ERM 18p11.3, which undergoes loss of heterozygosity in proteins (ezrin, radixin, moesin, and merlin). All 4.1 mammary tumors. Here, we examine the expression of family members are characterized by the presence of a 4.1B in murine mammary epithelium and find that 4.1B is conserved N-terminal membrane-association FERM dramatically upregulated in mammary epithelial cells (Fourpoint-one, Ezrin, Radixin, Moesin) domain during pregnancy when there is extensive cell prolifera- (Chishti et al., 1998).
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