Journal article
Frizzled7 Functions as a Wnt Receptor in Intestinal Epithelial Lgr5( ) Stem Cells
Dustin J Flanagan, Toby J Phesse, Nick Barker, Renate HM Schwab, Nancy Amin, Jordane Malaterre, Daniel E Stange, Cameron J Nowell, Scott A Currie, Jarel TS Saw, Eva Beuchert, Robert G Ramsay, Owen J Sansom, Matthias Ernst, Hans Clevers, Elizabeth Vincan
STEM CELL REPORTS | CELL PRESS | Published : 2015
Abstract
The mammalian adult small intestinal epithelium is a rapidly self-renewing tissue that is maintained by a pool of cycling stem cells intermingled with Paneth cells at the base of crypts. These crypt base stem cells exclusively express Lgr5 and require Wnt3 or, in its absence, Wnt2b. However, the Frizzled (Fzd) receptor that transmits these Wnt signals is unknown. We determined the expression profile of Fzd receptors in Lgr5(+) stem cells, their immediate daughter cells, and Paneth cells. Here we show Fzd7 is enriched in Lgr5(+) stem cells and binds Wnt3 and Wnt2b. Conditional deletion of the Fzd7 gene in adult intestinal epithelium leads to stem cell loss in vivo and organoid death in vitro...
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Grants
Awarded by NHMRC
Awarded by Melbourne Health
Awarded by Cancer Council of Victoria (CCV)
Awarded by Versus Arthritis
Funding Acknowledgements
We thank D.L. Neate and B.M. Tran for technical assistance. We thank A.R. Clarke for the AhCre mice and C.D. Mao for the expression plasmids. This work was supported by grants from NHMRC #566679 (E.V., N.B., H.C.), #603127 and #1025239 (T.J.P.), #1079257 (M.E.), and #487922 (M.E. and R.G.R.); Melbourne Health #605030 (E.V., N.B., T.J.P., H.C.), and the Cancer Council of Victoria (CCV) #APP1020716 (E.V., N.B., T.J.P., H.C.); and post-graduate awards from the CCV (D.J.F.) and Melbourne Health (R.H.M.S.). M.E. and R.G.R. are NHMRC Senior Research Fellows.