Bone Morphogenetic Protein 2 Is Expressed by, and Acts Upon, Mature Epithelial Cells in the Colon

James C.H. Hardwick*, Gijs R. Van Den Brink, Sylvia A. Bleuming, Isabel Ballester, Jan M.H. Van Den Brande, Josbert J. Keller, G. Johan A. Offerhaus, Sander J.H. Van Deventer, Maikel P. Peppelenbosch

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

220 Citations (Scopus)

Abstract

Background & Aims: The recent findings of bone morphogenetic protein (BMP) receptor la mutations in juvenile polyposis and frequent Smad4 mutations in colon cancer suggest a role for BMPs in the colonic epithelium and colon cancer. We investigated the role of BMP2 in the colon. Methods: We assessed BMP receptor expression in cell lines using the reverse-transcribed polymerase chain reaction and immunoblotting. We investigated the effect of BMP2 on cell lines using the MTT assay and by immunoblotting for markers of differentiation, proliferation, and apoptosis. We assessed the expression of BMP2, its receptors, and signal transduction elements in mouse and human colon tissue using immunohistochemistry. We also investigated the effect of the BMP antagonist noggin in vivo in mice by assessing colon tissue with immunohistochemistry and immunoblotting. Finally, we investigated the expression of BMP2 in microadenomas from familial adenomatous polyposis patients. Results: BMP receptors (BMPR) Ia, BMPR Ib, and BMPR Il are all expressed in colonic epithelial cell lines. BMP2 inhibits colonic epithelial cell growth in vitro, promoting apoptosis and differentiation and inhibiting proliferation. BMP2, BMPRIa, BMPRIb, BMPRIl, phosphorylated Smad1, and Smad4 are expressed predominantly in mature colonocytes at the epithelial surface in normal adult human and mouse colon. Noggin inhibits apoptosis and proliferation in mouse colonic epithelium in vivo. BMP2 expression is lost in the microadenomas of familial adenomatous polyposis patients. Conclusions: These data suggest that BMP2 acts as a tumor suppressor promoting apoptosis in mature colonic epithelial cells.

Original languageEnglish
Pages (from-to)111-121
Number of pages11
JournalGastroenterology
Volume126
Issue number1 SUPPL. 1
DOIs
Publication statusPublished - Jan 2004
Externally publishedYes

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