The Wnt Co-Receptor Lrp6 Is Required for Normal Mouse Mammary Gland Development

被引:111
作者
Lindvall, Charlotta
Zylstra, Cassandra R.
Evans, Nicole
West, Richard A.
Dykema, Karl
Furge, Kyle A.
Williams, Bart O.
机构
[1] Laboratory of Cell Signaling and Carcinogenesis, Van Andei Research Institute, Grand Rapids, MI
[2] Flow Cytometry, Van Andel Research Institute, Grand Rapids, MI
[3] Department of Computational Biology, Van Andel Research Institute, Grand Rapids, MI
来源
PLOS ONE | 2009年 / 4卷 / 06期
关键词
BETA-CATENIN; STEM-CELLS; BREAST CARCINOMAS; EXPRESSION; CANCER; GENE; MICE; INITIATION; MUTATIONS; RECEPTORS;
D O I
10.1371/journal.pone.0005813
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Canonical Wnt signals are transduced through a Frizzled receptor and either the LRP5 or LRP6 co-receptor; such signals play central roles during development and in disease. We have previously shown that Lrp5 is required for ductal stem cell activity and that loss of Lrp5 delays normal mammary development and Wnt1-induced tumorigenesis. Here we show that canonical Wnt signals through the Lrp6 co-receptor are also required for normal mouse mammary gland development. Loss of Lrp6 compromises Wnt/beta-catenin signaling and interferes with mammary placode, fat pad, and branching development during embryogenesis. Heterozygosity for an inactivating mutation in Lrp6 is associated with a reduced number of terminal end buds and branches during postnatal development. While Lrp6 is expressed in both the basal and luminal mammary epithelium during embryogenesis, Lrp6 expression later becomes restricted to cells residing in the basal epithelial layer. Interestingly, these cells also express mammary stem cell markers. In humans, increased Lrp6 expression is associated with basal-like breast cancer. Taken together, our results suggest both overlapping and specific functions for Lrp5 and Lrp6 in the mammary gland.
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页数:11
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