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Updated: Feb 14, 2026
Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
Published on: September 27, 2012
The Cdx2 homeobox gene suppresses intestinal tumorigenesis through non-cell-autonomous mechanisms
Camille Balbinot1, Olivier Armant2, Nabila Elarouci3
1Université de Strasbourg, Institut National de la Santé et de la Recherche Médicale, IRFAC UMR-S1113, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg, France.
Abstract:
Developmental genes contribute to cancer, as reported for the homeobox gene Cdx2 playing a tumor suppressor role in the gut. In this study, we show that human colon cancers exhibiting the highest reduction in CDX2 expression belong to the serrated subtype with the worst evolution. In mice, mosaic knockout of Cdx2 in the adult intestinal epithelium induces the formation of imperfect gastric-type metaplastic lesions. The metaplastic knockout cells do not spontaneously become tumorigenic. However, they induce profound modifications of the microenvironment that facilitate the tumorigenic evolution of adjacent Cdx2-intact tumor-prone cells at the surface of the lesions through NF-κB activation, induction of inducible nitric oxide synthase, and stochastic loss of function of Apc This study presents a novel paradigm in that metaplastic cells, generally considered as precancerous, can induce tumorigenesis from neighboring nonmetaplastic cells without themselves becoming cancerous. It unveils the novel property of non-cell-autonomous tumor suppressor gene for the Cdx2 gene in the gut.
Insights
Loss of the developmental gene CDX2 in gut cells can promote colon cancer. Metaplastic cells lacking CDX2 can trigger tumor formation in neighboring cells without becoming cancerous themselves.
Area of Science:
- Gastroenterology
- Molecular Biology
- Oncology
Background:
- Developmental genes, such as the homeobox gene CDX2, play crucial roles in tissue development and homeostasis.
- CDX2 is recognized for its tumor suppressor function in the gastrointestinal tract.
- Alterations in CDX2 expression are implicated in the development of various cancers, particularly colorectal cancer.
Purpose of the Study:
- To investigate the role of CDX2 in colorectal cancer development and progression.
- To explore the functional consequences of CDX2 loss in the intestinal epithelium.
- To elucidate the mechanisms by which CDX2-deficient cells influence tumorigenesis in a non-cell-autonomous manner.
Main Methods:
- Analysis of human colon cancer tissues to correlate CDX2 expression levels with cancer subtype and clinical outcome.
- Generation of a mouse model with mosaic knockout of the Cdx2 gene in the adult intestinal epithelium.
- Characterization of metaplastic lesions induced by Cdx2 deficiency.
- Investigation of microenvironmental changes and molecular signaling pathways (NF-κB, iNOS) involved in tumor promotion.
Main Results:
- Human colon cancers with the lowest CDX2 expression were identified as the serrated subtype with poor prognosis.
- Mosaic knockout of Cdx2 in mice induced gastric-type metaplasia in the intestinal epithelium.
- Cdx2-deficient metaplastic cells did not become tumorigenic but induced tumor formation in adjacent Cdx2-intact cells.
- Tumorigenesis was facilitated by microenvironmental modifications including NF-κB activation and iNOS induction.
Conclusions:
- CDX2 loss is associated with aggressive serrated colorectal cancers.
- Metaplastic cells, even without intrinsic tumorigenicity, can act as potent inducers of cancer in neighboring cells.
- This study reveals a novel non-cell-autonomous tumor suppressor function for CDX2 in the gut, challenging the traditional view of metaplasia as solely precancerous.
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