JCB logo
amgmicro.com
  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents

Published 10 December 2001. doi:10.1083/jcb.200107066
This Article
Right arrow Full Text
Right arrow Full Text (PDF, 566K)
Right arrow PPT slides of all figures
Right arrow Alert me when this article is cited
Right arrow Citation Map
Services
Right arrow Email this article
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new content in the JCB
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hsu, W.
Right arrow Articles by Costantini, F.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Hsu, W.
Right arrow Articles by Costantini, F.
Social Bookmarking
 Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Facebook   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

© The Rockefeller University Press, 0021-9525/2001/12/1055 $5.00
The Journal of Cell Biology, Volume 155, Number 6, December 10, 2001 1055-1064


Article

Impaired mammary gland and lymphoid development caused by inducible expression of Axin in transgenic mice



Wei Hsu, Reena Shakya and Frank Costantini

Department of Genetics and Development, College of Physicians and Surgeons, Columbia University, New York, NY 10032

Address correspondence to Frank Costantini, College of Physicians and Surgeons, Columbia University, 701 W. 68th St., New York, NY 10032. Tel.: (212) 305-6814. Fax: (212) 923-2090. E-mail: fdc3{at}columbia.edu

Axin is a component of the canonical Wnt pathway that negatively regulates signal transduction by promoting degradation of ß-catenin. To study the role of Axin in development, we developed strains of transgenic mice in which its expression can be manipulated by the administration of doxycycline (Dox). Animals carrying both mouse mammary tumor virus (MMTV)–reverse tetracycline transactivator and tetracycline response element (TRE)2–Axin–green fluorescent protein (GFP) transgenes exhibited Dox-dependent Axin expression and, when induced from birth, displayed abnormalities in the development of mammary glands and lymphoid tissues, both sites in which the MMTV promoter is active. The transgenic mammary glands underwent normal ductal elongation and side branching during sexual maturation and early pregnancy, but failed to develop lobulo-alveoli, resulting in a defect in lactation. Axin attenuated the expression of cyclin D1, a Wnt target that promotes the growth and differentiation of mammary lobulo-alveoli. Increased apoptosis occurred in the mammary epithelia, consistent with the inhibition of a Wnt/cyclin D1 survival signal by Axin. High levels of programmed cell death also occurred in the thymus and spleen. Immature thymocytes underwent massive apoptosis, indicating that the overexpression of Axin blocks the normal development of T lymphocytes. Our data imply that the Axin tumor suppressor controls cell survival, growth, and differentiation through the regulation of an apoptotic signaling pathway.

Key Words: Axin; Wnt signaling; cyclin D1; apoptosis; developmental abnormalities


Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Facebook Facebook   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:



  Home | Help | Feedback | Subscriptions | Archive | Search | Table of Contents