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Published on: June 7, 2016
[MicroRNA expression pattern in intraductal papillary mucinous neoplasm]
Yun Gyoung Park1, Kwang Hyuck Lee, Jong Kyun Lee
1Department of Internal Medicine, Division of Gastroenterology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
Background/Aims:
Intraductal papillary mucinous neoplasms (IPMN) are precursor lesions of fatal pancreatic cancer. Physiological function of microRNA is to regulate the stability and translation of mRNA. The aberrant microRNA expression is commonly observed in many cancers. The aim of this study was to analyze the expression pattern of microRNA in IPMN and evaluate the role of the microRNA.
Methods:
Using two paraffin-embedded IPMN tissues, microRNA expression of normal tissue, IPMN adenoma and carcinoma were compared by cDNA-mediated annealing, selection, extension and ligation microarray assay. Using real time PCR, expression levels of aberrantly up-regulated microRNAs were assessed in another 20 IPMNs, four pancreatic cancer cell lines (Panc1, MiaPaCa-2, XPA-3, BxPC-3) and immortalized pancreatic ductal cell line (HPNE). Effect of suppressing highly over-expressed two microRNAs in pancreatic cancer cell lines with anti-microRNA inhibitors were evaluated using CCK-8 assay.
Results:
Among aberrantly expressed 122 microRNAs in IPMN, miR-552, miR-25*, miR-183, miR-1300, miR-196a, miR-182*, and miR-30c-1* were consistently increased more than 3-fold. On average, miR-196a and miR-183 increased 10,824 folds and 26,519 folds in four pancreatic cancer cell lines compared with HPNE. These two microRNAs were also over-expressed in 20 IPMNs compared with HPNE. After applying anti-miRNA inhibitors, cell survival of four pancreatic cancer cell lines decreased by 24.5% with anti-miR-196a and by 14.2% with anti-miR-183 on average.
Conclusions:
Aberrant expression of 122 microRNAs was observed in IPMN. Two microRNAs, miR-196a and miR-183-increased in IPMN and pancreatic cancer cell lines compared with immortalized dancreatic ductal cell line. The inhibitions of these microRNAs repressed cell proliferation of pancreatic cancer cell lines. (Korean J Gastroenterol 2011;58:190-200).
Insights
Intraductal papillary mucinous neoplasms (IPMN) are pancreatic cancer precursors. This study identified specific microRNAs (miRNAs) overexpressed in IPMN and pancreatic cancer, finding that inhibiting these miRNAs reduced cancer cell proliferation.
Area of Science:
- Molecular biology
- Oncology
- Genetics
Context:
- Intraductal papillary mucinous neoplasms (IPMN) are recognized precursor lesions for pancreatic cancer.
- Aberrant microRNA (miRNA) expression is a hallmark of various cancers, suggesting their role in tumorigenesis.
- Understanding miRNA dysregulation in IPMN is crucial for early detection and therapeutic strategies.
Purpose:
- To analyze the expression patterns of microRNAs in IPMN tissues.
- To identify specific miRNAs that are aberrantly expressed in IPMN and pancreatic cancer.
- To evaluate the functional role of overexpressed miRNAs in pancreatic cancer cell proliferation.
Summary:
- MicroRNA expression profiling revealed 122 aberrantly expressed miRNAs in IPMN.
- miR-196a and miR-183 were significantly overexpressed in IPMN and pancreatic cancer cell lines compared to normal pancreatic ductal cells.
- Inhibition of miR-196a and miR-183 using anti-miRNA inhibitors led to a significant decrease in pancreatic cancer cell survival and proliferation.
Impact:
- Identifies miR-196a and miR-183 as potential biomarkers for IPMN and pancreatic cancer.
- Suggests that targeting these specific miRNAs could be a novel therapeutic approach for pancreatic cancer.
- Provides insights into the molecular mechanisms underlying IPMN progression and pancreatic cancer development.
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