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J. Biol. Chem., Vol. 277, Issue 11, 8847-8853, March 15, 2002
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§,
,
From the Division of Gastroenterology, GRASP Digestive Disease
Center, New England Medical Center/Tufts University School of Medicine,
Boston, Massachusetts 02111
Expression of the hormone secretin in
enteroendocrine cells is restricted to the nondividing villus
compartment of the intestine, implying that terminal differentiation is
linked to cell cycle arrest and that differentiation is repressed in
actively proliferating cells. We have shown previously that the basic
helix-loop-helix protein, BETA2/NeuroD, induces cell cycle withdrawal
in addition to increasing secretin gene expression. A number of
transcription factors important for differentiation are repressed by D
cyclins. Repression by D cyclins appears to be independent of its
effects on the cell cycle. We show that cyclin D1 represses
BETA2/NeuroD-dependent transcription of the secretin gene.
Examination of cyclin box mutants shows that repression is
unrelated to Cdk4 activation. Although cyclin D1 and BETA2 associate
in vivo, they do not directly interact. Cyclin D1 may be
recruited to BETA2 by binding to the C-terminal domain of the p300
coactivator, downstream from the BETA2-binding site. In the small
intestine, cyclin D1 expression occurs only in the actively
proliferating crypts of Lieberkuhn but not in villi. Thus repression by
cyclin D1 may serve to prevent secretin gene transcription from
occurring in relatively immature epithelial progenitor cells.
Both authors contributed equally to this work.
§
Present address: INSERM U45, Hôpital Edouard Herriot Pavillon
Hbis, 69437 Lyon Cedex 03, France.
¶
Present address: Jichi Medical School, Gastroenterology
Division, Yakushiji 3311-1, Minamikawachimachi, Kawachi-gun,
Tochigi-ken 329-0498, Japan.
To whom correspondence should be addressed: Division of
Gastroenterology, 218, New England Medical Center, 750 Washington St.,
Boston, MA 02111. Tel.: 617-636-8337; Fax: 617-636-4207; E-mail:
aleiter@lifespan.org.
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