Reduction of menin expression enhances cell proliferation and is tumorigenic in intestinal epithelial cells.

Authors: Ratineau, C  Bernard, C  Poncet, G  Blanc, M  Josso, C  Fontaniere, S  Calender, A  Chayvialle, JA  Zhang, CX  Roche, C 
Citation: Ratineau C, etal., J Biol Chem 2004 Jun 4;279(23):24477-84. Epub 2004 Mar 30.
Pubmed: (View Article at PubMed) PMID:15054094
DOI: Full-text: DOI:10.1074/jbc.M401835200

Menin, the product of the tumor suppressor gene MEN1, is widely expressed in mammalian endocrine and non-endocrine tissues, including intestine. Its known abundant expression in several types of cells with high proliferative capacity led us to investigate the physiological function of the protein menin in intestinal epithelium, one of the most rapidly growing epithelia. Here we showed that the Men1 gene is mainly expressed in the crypt compartment of the proximal small intestine and that its expression was increased during fasting in vivo, both suggesting a role of menin in the control of cell growth. Indeed, specific reduction of menin expression by transfected antisense cDNA in the rat duodenal crypt-like cell line, IEC-17, increased cell proliferation. The latter is correlated to a loss of cell-cycle arrest in G(1) phase by resting cells and an overexpression of cyclin D1 and cyclin-dependent kinase (Cdk)-4. Furthermore, these cells lost the inhibition of proliferation induced by transforming growth factor-beta1, associated with a decrease of transforming growth factor-beta type II receptor expression. As a result of deregulated proliferation, antisense menin transfected IEC-17 cells became tumorigenic as shown in vitro as well as in vivo in immunosuppressed animals. These results indicate that menin contributes to proliferation control in intestinal epithelial cells. The present study reveals an unknown physiological function for menin in intestine that may be important in the regulation of epithelial homeostasis.

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CRRD Object Information
CRRD ID: 1304318
Created: 2004-12-22
Species: All species
Last Modified: 2004-12-22
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.