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Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations
Published on: November 7, 2019
GIPC2 suppresses colorectal cancer progression via regulation by UBA1-mediated ubiquitination
Xinye Cui1,2, Yuzhuo Chen2, Quan Rao1
1Department of General Surgery, Beijing Friendship Hospital, Capital Medical University & State Key Lab of Digestive Health & National Clinical Research Center for Digestive Diseases, Beijing 100050, P. R. China.
Background:
Colorectal cancer (CRC) constitutes a major worldwide cancer challenge, characterized by consistently increasing numbers of new cases and deaths. GIPC2, a molecule with context-dependent regulatory functions across cancers, remains poorly characterized in CRC. This study aims to investigate the biological functions and underlying molecular mechanisms of GIPC2 in colorectal carcinogenesis and progression.
Methods:
GIPC2 expression in CRC tissues and cell lines was evaluated utilizing the Cancer Genome Atlas (TCGA) data, western blotting, and immunohistochemistry. The proliferative capacity of cells was assessed by Cell Counting Kit-8 (CCK-8) together with colony-formation assays, and migratory and invasive behaviors were measured using transwell assays combined with analyses of epithelial-mesenchymal transition markers. Protein interactions among UBA1, TRIM21, and GIPC2 were examined by mass spectrometry, co-immunoprecipitation, and immunofluorescence. In vivo experiments with GIPC2 knockdown or overexpression were performed to validate its effects on tumor growth. Downstream GIPC2-regulated signaling pathways were mapped by Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis.
Results:
GIPC2 expression was downregulated among both CRC cell lines and clinical tissue samples, and low GIPC2 levels were associated with poor patient prognosis. Functional analyses showed that GIPC2 suppressed CRC proliferation, migration, and invasion. Mechanistically, UBA1 binds to GIPC2 and, together with TRIM21, catalyzed the assembly of K48-specific ubiquitin chains and subsequent proteasome-dependent breakdown of GIPC2, thereby enhancing PI3K/AKT signaling. In vivo and in vitro experiments demonstrated that the UBA1-GIPC2 axis can affect the progression of CRC.
Conclusion:
Our findings identified GIPC2 as a previously uncharacterized tumor suppressor in CRC and revealed a previously unrecognized UBA1-GIPC2 axis that governs proteasome-mediated regulation of tumor progression. These results provide new mechanistic insight and suggest potential therapeutic targets for CRC treatment.
Insights
GIPC2 acts as a tumor suppressor in colorectal cancer (CRC), inhibiting proliferation and metastasis. Its degradation via the UBA1-TRIM21 axis promotes CRC progression, offering potential therapeutic targets.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Colorectal cancer (CRC) is a significant global health burden with increasing incidence and mortality.
- The role of GIPC2 in CRC remains largely uncharacterized despite its known functions in other cancers.
Purpose of the Study:
- To investigate the biological functions of GIPC2 in colorectal carcinogenesis.
- To elucidate the molecular mechanisms underlying GIPC2's role in CRC progression.
Main Methods:
- GIPC2 expression analysis in CRC tissues and cell lines using TCGA, western blotting, and IHC.
- Functional assays including CCK-8, colony formation, and transwell assays to assess proliferation, migration, and invasion.
- Mass spectrometry, co-IP, and immunofluorescence to identify protein interactions; in vivo experiments and KEGG pathway analysis.
Main Results:
- GIPC2 expression is downregulated in CRC, correlating with poor prognosis.
- GIPC2 suppresses CRC cell proliferation, migration, and invasion.
- UBA1 and TRIM21 mediate proteasomal degradation of GIPC2, enhancing PI3K/AKT signaling and promoting CRC progression.
Conclusions:
- GIPC2 functions as a tumor suppressor in CRC.
- A novel UBA1-GIPC2 axis regulates CRC progression through proteasomal degradation.
- This axis presents potential therapeutic targets for CRC treatment.
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