Related Experiment Video
Updated: Aug 9, 2025
Detection of a Circulating MicroRNA Custom Panel in Patients with Metastatic Colorectal Cancer
Published on: March 14, 2019
A Group of Tumor-Suppressive micro-RNAs Changes Expression Coordinately in Colon Cancer
Ovidiu Farc1, Liviuta Budisan2, Ioana Berindan-Neagoe2
1Immunology Department, "Iuliu Hatieganu" University of Medicine and Pharmacy, 400347 Cluj-Napoca, Romania.
Abstract:
MicroRNAs (miRNAs) are molecules with a role in the post-transcriptional regulation of messenger RNA, being involved in a wide range of biological and pathological processes. In the present study, we aim to characterize the behavior of a few miRNAs with roles in the cell cycle and differentiation of colon cancer (CC) cells. The present work considers miRNAs as reflections of the complex cellular processes in which they are generated, their observed variations being used to characterize the molecular networks in which they are part and through which cell proliferation is achieved. Tumoral and adjacent normal tissue samples were obtained from 40 CC patients, and the expression of miR-29a, miR-146a, miR-215 and miR-449 were determined by qRT-PCR analysis. Subsequent bioinformatic analysis was performed to highlight the transcription factors (TFs) network that regulate the miRNAs and functionally characterizes this network. There was a significant decrease in the expression of all miRNAs in tumor tissue. All miRNAs were positively correlated with each other. The analysis of the TF network showed tightly connected functional modules related to the cell cycle and associated processes. The four miRNAs are downregulated in CC; they are strongly correlated, showing coherence within the cellular network that regulates them and highlighting possible approach strategies.
Insights
Four microRNAs (miRNAs) are significantly downregulated in colon cancer (CC) tissues, correlating with each other and indicating potential therapeutic strategies targeting cell cycle regulation.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- MicroRNAs (miRNAs) are key regulators of gene expression, influencing numerous biological and pathological processes.
- Dysregulation of miRNAs is implicated in the development and progression of various cancers, including colon cancer (CC).
Purpose of the Study:
- To investigate the expression patterns of specific miRNAs (miR-29a, miR-146a, miR-215, miR-449) in colon cancer.
- To analyze the regulatory network of transcription factors (TFs) associated with these miRNAs in CC.
- To explore the potential of these miRNAs as biomarkers or therapeutic targets in CC.
Main Methods:
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to measure miRNA expression levels.
- Bioinformatic analysis was employed to identify and characterize the TF network regulating the selected miRNAs.
- Tumoral and adjacent normal colon tissue samples from 40 CC patients were analyzed.
Main Results:
- All four investigated miRNAs (miR-29a, miR-146a, miR-215, miR-449) showed significantly decreased expression in colon tumor tissues compared to adjacent normal tissues.
- A strong positive correlation was observed among the expression levels of these four miRNAs.
- The bioinformatic analysis revealed tightly interconnected functional modules within the TF network, associated with cell cycle regulation.
Conclusions:
- The downregulation and positive correlation of miR-29a, miR-146a, miR-215, and miR-449 in CC suggest their collective role in maintaining cellular homeostasis.
- The identified TF network provides insights into the regulatory mechanisms governing these miRNAs in colon cancer.
- These findings highlight the potential of targeting these miRNAs or their regulatory pathways for therapeutic intervention in colon cancer.
Related Concept Videos
01:22MicroRNAs
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
02:07Tumor Progression
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
02:17The Tumor Microenvironment