Ectopic expression of Oct-4 blocks progenitor-cell differentiation and causes dysplasia in epithelial tissues

Konrad Hochedlinger ¹, Yasuhiro Yamada , Caroline Beard

⁰Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.

Cell +

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May 11, 2005

View abstract on PubMed

Summary

Oct-4, a key embryonic gene, can induce cancerous growths in adult mice when reactivated in somatic tissues. This suggests adult progenitor cells can revert to an embryonic-like state, driving tumor formation.

Area Of Science

Developmental Biology
Cancer Biology
Stem Cell Biology

Background

Oct-4 is a POU-domain transcription factor crucial for maintaining pluripotency in embryonic stem cells.
Oct-4 is also detected in germ-cell tumors and some somatic tumors, hinting at a potential role in oncogenesis.
The precise oncogenic properties and mechanisms of Oct-4 in adult somatic tissues remain largely uncharacterized.

Purpose Of The Study

To investigate the consequences of ectopic Oct-4 expression in adult mouse somatic tissues.
To determine if Oct-4 can induce tumorigenic changes in differentiated adult cells.
To elucidate the cellular mechanisms underlying Oct-4-induced dysplasia.

Main Methods

Utilized a doxycycline-inducible system for controlled, ectopic Oct-4 expression in adult mice.
Analyzed histological and molecular changes in epithelial tissues, particularly the intestine, upon Oct-4 activation.
Assessed progenitor cell expansion and beta-catenin transcriptional activity in Oct-4-expressing lesions.

Main Results

Ectopic Oct-4 expression in adult mice induced dysplastic growths in epithelial tissues.
These growths were dependent on continuous Oct-4 expression and characterized by progenitor cell expansion.
Oct-4 inhibited cellular differentiation in the intestine, mimicking its embryonic role, and increased beta-catenin activity.

Conclusions

Adult progenitor cells can retain the capacity to respond to key embryonic developmental signals.
Ectopic expression of the embryonic factor Oct-4 can drive tumorigenesis in adult somatic tissues.
Progenitor cell plasticity is a significant factor in the initiation and progression of cancer.

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