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Updated: Jan 14, 2026
Molecular Profiling of the Invasive Tumor Microenvironment in a 3-Dimensional Model of Colorectal Cancer Cells and Ex vivo Fibroblasts
Published on: April 29, 2014
The tumor microenvironment reprograms FAM227A expression: Implications for CRC metastasis and diagnostic biomarker
Hongping Wang1, Bin Yang2, Rui Wang3
1Laboratory of Gastroenterology, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, 310009, Zhejiang Province, China; Department of Geriatrics, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, 310009, Zhejiang Province, China.
Background:
Colorectal cancer (CRC) is one of the most common malignant diseases which imposing a substantial burden on global health and economies. We previously identified a novel molecule, FAM227A, through functional screening using an shRNA retroviral library.
Methods:
We used mouse immunization, hybridoma preparation, antibody screening and purification to get several mouse antibodies targeting human FAM227A. We use Western blot and RT-qPCR to detect the expression of FAM227A in colorectal cancer cells and tissues. Confocal imaging, nuclear-cytoplasmic fractionation and mitochondrial isolation were used to demonstrate the subcellular localization and expression of FAM227A. We performed tumorigenesis assays to investigate the tumor-promoting ability of FAM227A. Finally, we employed ELSIA to detect the expression of FAM227A in the serum of pan-cancer patients and get a ROC curve.
Results:
In this study, we developed specific monoclonal antibodies (mAbs) against human FAM227A, identifying clone #8 with high affinity and specificity. Analysis of FAM227A expression in colorectal cancer (CRC) and different in vitro TME stress simulations. Subcellular localization studies indicated FAM227A primarily resides cytoplasmically but undergoes nuclear translocation and mitochondrial enrichment under specific conditions. Notably, FAM227A undergoes C-terminal degradation, producing a ∼30 kDa fragment (ΔFAM227A), potentially mediated by FBXW7 via a predicted recognition motif. Functionally, FAM227A overexpression modulated mitophagy markers and p53 phosphorylation. In p53-mutant CRC cells, FAM227A overexpression suppressed tumor growth in vivo, contrasting with variable effects in p53 wild-type cells, indicating p53 status-dependent tumor suppression. Finally, serum FAM227A levels were significantly elevated across multiple cancer types compared to healthy controls, suggesting its potential as a pan-cancer diagnostic biomarker.
Conclusions:
Collectively, our findings reveal FAM227A as a dynamically regulated protein influenced by the TME, involved in p53 pathway modulation, and a promising circulating biomarker for cancer detection.
Insights
Researchers developed specific antibodies to study FAM227A, a protein influencing colorectal cancer (CRC) growth and potentially acting as a pan-cancer biomarker. Elevated serum FAM227A levels suggest its diagnostic utility.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Colorectal cancer (CRC) presents a significant global health challenge.
- FAM227A was identified as a novel molecule through functional screening.
Purpose of the Study:
- To develop specific antibodies against human FAM227A.
- To investigate the expression, localization, and function of FAM227A in colorectal cancer.
- To evaluate FAM227A as a potential diagnostic biomarker for pan-cancer detection.
Main Methods:
- Generation of specific monoclonal antibodies against human FAM227A.
- Analysis of FAM227A expression in CRC cells and tissues using Western blot and RT-qPCR.
- Subcellular localization studies (confocal imaging, fractionation, isolation).
- Tumorigenesis assays to assess FAM227A's role in tumor promotion.
- ELISA and ROC curve analysis for serum FAM227A detection in pan-cancer patients.
Main Results:
- High-affinity monoclonal antibodies against FAM227A were successfully developed.
- FAM227A exhibits dynamic subcellular localization, including nuclear translocation and mitochondrial enrichment under stress.
- FAM227A undergoes C-terminal degradation, producing a ~30 kDa fragment (ΔFAM227A).
- FAM227A modulates mitophagy and p53 phosphorylation, with p53 status-dependent effects on CRC tumor suppression.
- Elevated serum FAM227A levels were observed across multiple cancer types.
Conclusions:
- FAM227A is a dynamically regulated protein influenced by the tumor microenvironment (TME).
- FAM227A is involved in modulating the p53 pathway.
- FAM227A shows promise as a circulating biomarker for cancer detection.
