Author/Authors :
Ghanbari, Reza Digestive Oncology Research Center - Digestive Diseases Research Institute - Tehran University of Medical Sciences , Rezasoltani, Sama Department of Biology - Science and Research Branch - Tehran Islamic Azad University , Hashemi, Javad Department of Clinical Biochemistry - Tehran University of Medical Sciences , Mohamadkhani, Ashraf Digestive Oncology Research Center - Digestive Diseases Research Institute - Tehran University of Medical Sciences , Tahmasebifar, Arash Department of Molecular Medicine and Nanomedicine - Golestan University of Medical Sciences (GOUMS) , Arefian, Ehsan Department of Microbiology - College of Science - University of Tehran , Mobarra, Naser Department of Microbiology - College of Science - University of Tehran , Asadi, Jahanbakhsh 7Gastroenterology and Liver Disease Research Center, Research Institute for Gastroenterology and Liver Dseases - Shahid Beheshti University of Medical Sciences , Nazemalhosseini Mojarad, Ehsan Infectious Disease Research Center - Golestan University of Medical Science , Yazdani, Yaghoub Department of Pathology - Haartman Institute - Helsinki University - Finland , Knuutila, Sakari Digestive Oncology Research Center - Digestive Diseases Research Institute - Tehran University of Medical Sciences , Malekzadeh, Reza Digestive Oncology Research Center - Digestive Diseases Research Institute - Tehran University of Medical Sciences
Abstract :
Background
Colorectal cancer (CRC) is one of the most common causes of cancer-related mortality worldwide. Early diagnosis of this neoplasm is critical and may reduce patients mortality. MicroRNAs are small non-coding RNA molecules whose expression pattern can be altered in various diseases such as CRC.
Methods
In this study, we evaluated the expression levels of miR-142-3p, miR-26a-5p (their reduced expression in plasma samples of CRC patients was previously confirmed), miR-4478 and miR-1295-3p (their reduced expression in stool samples of CRC patients was previously confirmed) in tissue samples of CRC patients in comparison to healthy subjects.
To achieve this purpose, total RNA including small RNA was extracted from 53 CRC and 35 normal subjects Formalin-fixed, Paraffin-embedded (FFPE) tissue samples using the miRNeasy FFPE Mini Kit. The expression levels of these four selected miRNAs were measured using quantitative Reverse Transcriptase Polymerase Chain Reaction (qRT-PCR).
Results
We found that the expression levels of miR-4478 and miR-1295b-3p (two previously down-regulated fecal miRNAs) were significantly decreased in FFPE samples of CRC patients compared to healthy controls. On the other hand, no significant differences were seen in expression levels of miR-142-3p and miR-26a-5p (two previously down-regulated circulating miRNAs) in FFPE samples between these two groups.
Conclusion
Regarding current findings, it may be concluded that to diagnose CRC patients based on the miRNAs approach, stool samples are more likely preferable to plasma samples; nevertheless, additional studies with more samples are needed to confirm the results.
Keywords:
Keywords :
Biomarker , colorectal cancer , early detection , tissue microRNA
