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Updated: Feb 15, 2026

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
Published on: June 17, 2014
Identification of a noncanonical function for ribose-5-phosphate isomerase A promotes colorectal cancer formation by
Yu-Ting Chou1,2, Jeng-Kai Jiang3, Muh-Hwa Yang4
1Institute of Molecular and Genomic Medicine, National Health Research Institutes, Zhunan, Miaoli, Taiwan.
Ribose-5-phosphate isomerase A (RPIA) promotes colorectal cancer (CRC) by entering the nucleus to stabilize beta-catenin. This novel function of RPIA in CRC suggests its potential as a therapeutic target and prognostic biomarker.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Altered cellular metabolism is a key feature of cancer.
- Ribose-5-phosphate isomerase A (RPIA), a pentose phosphate pathway enzyme, is implicated in tumorigenesis in multiple tissues.
- The specific role of RPIA in colorectal cancer (CRC) pathogenesis remained unclear.
Purpose of the Study:
- To investigate the molecular mechanism of RPIA in colorectal cancer (CRC).
- To determine the noncanonical functions of RPIA beyond its role in the pentose phosphate pathway.
- To explore RPIA as a potential biomarker and therapeutic target for CRC.
Main Methods:
- Analysis of RPIA mRNA and protein levels in patient CRC tissues and cell lines.
- Investigation of RPIA's interaction with beta-catenin and adenomatous polyposis coli (APC) in the nucleus.
- Functional studies using RPIA transgenic zebrafish models.
Main Results:
- RPIA expression is significantly elevated in CRC tissues and promotes cell proliferation and oncogenicity.
- RPIA translocates to the nucleus, complexes with APC and beta-catenin, and prevents beta-catenin degradation.
- The C-terminal region of RPIA is crucial for its tumorigenic activity, and RPIA induces CRC in zebrafish.
Conclusions:
- RPIA possesses a novel nuclear function in CRC by stabilizing beta-catenin.
- This mechanism contributes to RPIA-mediated tumorigenesis in colorectal cancer.
- RPIA represents a potential biomarker for targeted therapy and prognosis in CRC.
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