Abstract
Background
Altered expression of specific microRNAs (miRNA) is known to occur during colorectal carcinogenesis. However, little is known about the genome-wide alterations in miRNA expression during the neoplastic progression of primary colorectal cancers.
Methods
Using a miRNA array platform, we evaluated the expression of 668 miRNA in primary colonic adenocarcinomas. Biological functions of selected miRNA were evaluated with in vitro invasion assays.
Results
RNA was extracted for miRNA analysis from 65 primary colon cancers. We identified a seven-miRNA expression signature that differentiated stage I and stage IV primary colon cancers. We then demonstrated this signature was able to discriminate between stage II and III primary colon cancers. Six differentially expressed miRNA were downregulated in association with the development of metastases, and all 7 miRNA were complementary strand miRNA. We transfected HCT-116, a highly invasive colon cancer cell line, with corresponding downregulated miRNA and demonstrated that overexpression of three miRNA (miR200c*, miR143*, and miR424*) significantly abrogated invasive potential.
Conclusion
We have identified a seven-miRNA signature that is associated with metastatic potential in the primary tumor. Forced overexpression of three downregulated miRNA resulted in attenuation of in vitro invasion, suggesting direct tumor suppressive function and further supporting the biological importance of complementary strand miRNA.




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Funding
National Cancer Institute Grant (CA112215).
Florida Department of Health Bankhead-Coley Cancer Program Grant (08BR-02).
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Yun Shin Chun (Philadelphia, PA): Dr. Hernandez, congratulations on this important contribution to our understanding of molecular changes in colon cancer. Since one microRNA (miRNA) regulates expression of hundreds of genes, much information can be gathered from analysis of over 600 miRNAs as you have shown. The seven miRNA signature significantly discriminates between stage I and IV colon cancer patients and between stage II and III, although there is no difference between stage III and IV patients. Six of the seven miRNAs are downregulated, consistent with published literature showing a general downregulation of miRNAs in cancer cells compared to non-tumorous tissue, indicating a tumor suppressor effect of many miRNAs. Notably, all of the seven miRNAs in this signature are complementary strand miRNAs, which were previously thought to be biologically inactive. There was no correlation between levels of complementary strand and mature miRNAs, suggesting a biologic function of complementary strand miRNAs distinct from their corresponding mature miRNAs.
I had three questions:
1. What are the differential levels of miRNAs in primary colon cancers compared with nodal and systemic metastases, and what are the changes in expression levels with preoperative chemotherapy?
2. Second, miR-21 is perhaps the most studied dysregulated miRNA in colon cancer. What were the expression levels of miR-21 in your patients?
3. Third, can you speculate on practical diagnostic or therapeutic applications of your findings?
Closing Discussant
Dr. Jonathan Hernandez: Regarding your first question, we have not evaluated the effect of neoadjuvant chemotherapy on the expression of miRNA. We have also not specifically evaluated miRNA expression in either lymph node or systemic metastases, although this would be of significant interest. If one accepts that lymph node metastases represent in-transit cells similar to circulating tumor cells, we would expect low or negligible expression of miRNA that inhibit genes associated with the acquisition of metastatic potential. According to our data, miR200c*, miR143*, and miR424* may be examples of such miRNA. If conceptualized in the context of epithelial-to-mesenchymal transition (EMT), we would predict that systemic macrometastases display miRNA expression profiles similar to primary tumors given that mobile mesenchymal cells undergo an epithelial transition in order to recapitulate a tumor mass.
To answer your second question, miR-21 has been shown to target PTEN, and thereby deregulate the PI3K pathway, increasing AKT signaling. We found no differential expression of miR-21 across the spectrum of AJCC stage I-IV primary colon cancers. We definitely observed expression of miR-21, although I’m not sure the absolute value is meaningful in terms of external comparison.
Finally, in response to your third question, our signature may have prognostic value in discriminating those patients with apparent early-stage tumors that eventually develop overt metastatic disease. We may be able to determine a metastatic probability for these patients based upon the expression of metastases-associated miRNA in the primary tumor. Firstly, such a signature may allow the identification of patients with early stage disease who may benefit from the use of adjuvant chemotherapy. Secondly, we believe that the therapeutic application as it relates to the individual miRNAs will be predicated upon elucidation of the functional biology of each miRNA in our signature. In this latter case, however, anti-miR therapy is currently in its infancy and may not have immediate direct translational applicability.
Dung-Tsa Chen and Jonathan M. Hernandez contributed equally to the work and share first authorship.
DC: Study concept and design, analysis of data, drafting of the manuscript, JMH: Study concept and design, interpretation of data, drafting of the manuscript, DS: Interpretation of data, drafting of the manuscript, SMM: Acquisition of data, LAH: Acquisition of data ,WC: Acquisition of data, AE: Acquisition of data, MG: Study concept and design, DC: Acquisition of data, TY: Study concept and design, critical revision of the manuscript, obtained funding
This work was conducted at Moffitt Cancer Center. We have no conflicts of interest to disclose.
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Chen, DT., Hernandez, J.M., Shibata, D. et al. Complementary Strand MicroRNAs Mediate Acquisition of Metastatic Potential in Colonic Adenocarcinoma. J Gastrointest Surg 16, 905–913 (2012). https://doi.org/10.1007/s11605-011-1815-0
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DOI: https://doi.org/10.1007/s11605-011-1815-0