-Catenin Induces -TrCP-Mediated PER2 Degradation Altering Circadian Clock Gene Expression in Intestinal Mucosa of ApcMin/+ Mice

Dec 25, 2008Journal of biochemistry

Beta-catenin triggers breakdown of a key clock protein, changing daily gene patterns in the gut lining of ApcMin/+ mice

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Abstract

Increased expression of beta-catenin destabilizes the PER2 clock protein.

The proliferation of intestinal epithelial cells follows a daily rhythm influenced by the circadian clock.
Per2, a core clock gene, plays a crucial role in regulating cell growth and has tumor-suppressing functions.
Circadian disruption may increase the risk of colon cancer by affecting the regulation of epithelial cell proliferation.
Increased beta-catenin levels are linked to both familial and spontaneous colon cancer.
In Apc(Min/+) mice, decreased PER2 protein levels correlate with changes in the circadian rhythms of various clock genes.

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Proliferation of intestinal epithelial cells is rhythmic throughout the day. This temporal organization occurs through the interaction between the endogenous peripheral circadian clock and pathways controlling cell cycle progression. Per2, a core clock gene with tumour suppresser function, is critical to clock function and to the regulation of cellular proliferation. Circadian disruption, which increases colon cancer incidence, may do so by deregulating clock controlled epithelial cell proliferation. Increased expression of beta-catenin is a contributing cause of most familial and spontaneous human colon cancer and the cause of multiple intestinal neoplasia of the Apc(Min/+) mouse. Here we report that increased beta-catenin destabilizes PER2 clock protein by inducing beta-TrCP, an F-box protein of SCF ubiquitin E3 ligase. In the intestinal mucosa of the Apc(Min/)(+) mouse, the decrease in PER2 protein levels is associated with altered circadian rhythms of clock genes, Per1 and Per2, and clock controlled genes, Dbp and Wee1. These findings suggest that disruption of the peripheral intestinal circadian clock may be intimately involved in beta-catenin induced intestinal epithelial neoplastic transformation in both mouse and man.

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-Catenin Induces -TrCP-Mediated PER2 Degradation Altering Circadian Clock Gene Expression in Intestinal Mucosa of ApcMin/+ Mice

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