Axin2 expression identifies progenitor cells in the murine prostate
Version of Record online: 18 JUN 2008
Copyright © 2008 Wiley-Liss, Inc.
Volume 68, Issue 12, pages 1263–1272, 1 September 2008
How to Cite
Ontiveros, C. S., Salm, S. N. and Wilson, E. L. (2008), Axin2 expression identifies progenitor cells in the murine prostate. Prostate, 68: 1263–1272. doi: 10.1002/pros.20770
- Issue online: 11 JUL 2008
- Version of Record online: 18 JUN 2008
- Manuscript Accepted: 6 MAR 2008
- Manuscript Received: 21 NOV 2007
- National Institutes of Health (NIH)
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Grant Numbers: 5F32DK071468, DK 52634
- National Cancer Institute (NCI). Grant Number: CA132641
- stem cell;
We previously reported that prostatic stem/progenitor cells are concentrated in the proximal region of prostatic ducts and express stem cell antigen 1 (Sca-1). As Wnt signaling is important for the maintenance of stem cells, we determined whether Sca-1 expressing cells also express Axin2, as Axin2 expression is highly suggestive of active Wnt signaling.
Axin2 promoter reporter mice were used for whole mount and fluorescence activated cell sorting (FACS) analysis to determine its expression in the prostate. Axin2 expressing cells were also examined for the co-expression of Sca-1. We also used a chemical activator of Wnt signaling, BIO, to determine the effects of Wnt signaling on the growth of primary prostate cells in vitro.
We show that Axin2 expression is present in all lobes and is regulated by androgens with the highest Axin2 expression in the lateral and dorsal prostate. Furthermore, a fraction of Axin2 expressing cells co-express Sca-1, suggesting that some progenitor cells have active Wnt signaling. Lastly, we demonstrate that activation of the Wnt pathway may result in increased growth, consistent with a role for Wnt signaling in maintenance and/or expansion of the progenitor cell population.
Axin2 expressing cells that co-express Sca-1 are present in all prostate lobes suggesting that progenitor cells reside within the Wnt active population. An understanding of the basic biology of signaling pathways mediating growth in the prostate may lead to rational therapies to treat benign prostatic hyperplasia and prostate cancer. Prostate 68:1263–1272, 2008. © 2008 Wiley-Liss, Inc.