Involvement of Human Micro-RNA in Growth and Response to Chemotherapy in Human Cholangiocarcinoma Cell Lines
Open accessAbstract
Background & aims Micro-RNA (miRNA) are endogenous regulatory RNA molecules that modulate gene expression. Alterations in miRNA expression can contribute to tumor growth by modulating the functional expression of critical genes involved in tumor cell proliferation or survival. Our aims were to identify specific miRNA involved in the regulation of cholangiocarcinoma growth and response to chemotherapy. Methods miRNA expression in malignant and nonmalignant human cholangiocytes was assessed using a microarray. Expression of selected miRNA and their precursors was evaluated by Northern blots and real-time polymerase chain reaction, respectively. The effect of selected miRNA on cell growth and response to chemotherapy was assessed using miRNA-specific antisense oligonucleotides to decrease miRNA expression or with precursor miRNA to increase cellular expression. Results miRNA expression was markedly different in malignant cholangiocytes, with decreased expression of many miRNA compared with nonmalignant cells. A cluster of miRNA, including miR-320, miR-200b, miR-21, miR-23a, miR-141, miR-27a, and miR-34a, were expressed in all cell lines. MiR-21, miR-141, and miR-200b were highly over-expressed in malignant cholangiocytes. Inhibition of miR-21 and miR-200b increased sensitivity to gemcitabine, whereas inhibition of miR-141 decreased cell growth. Treatment of tumor cell xenografts with systemic gemcitabine altered the expression of a significant number of miRNA. miR-21 modulates gemcitabine-induced apoptosis by phosphatase and tensin homolog deleted on chromosome 10 (PTEN)-dependent activation of PI 3-kinase signaling. Potential target genes that were modulated by selected miRNA were identified. Conclusions Alterations in miRNA expression contribute to tumor growth and response to chemotherapy. Aberrantly expressed miRNA or their targets will provide mechanistic insight and therapeutic targets for cholangiocarcinoma.
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Three miR-21 targets have been described: PTEN, PDCD4, and TPM1.
“Three miR-21 targets have, thus far, been described: phosphatase and tensin homologue (PTEN), programmed cell death 4 (PDCD4) and Tropomyosin 1 (TPM1; refs.10,[14][15][16].”
From MicroRNA-21 Targets a Network of Key Tumor-Suppressive Pathways in Glioblastoma Cells (2008) · cites this paper as [10]
The section “miR-21 Directly Alters PTEN Expression” (page unavailable) reports that miR-21 directly modulates expression through PTEN’s 3′-UTR, supporting PTEN as a target. Searches for PDCD4 and TPM1 found no passages in our copy describing either as a miR-21 target, so this source does not support those two parts of the list. (LLM, conf=0.88)
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- Authors
- Meng, F., Henson, R., Lang, M., Wehbe, H., Maheshwari, S., Mendell, J. T., Jiang, J., Schmittgen, T. D., & Patel, T.
- Affiliations
- Texas A&M University System (US)
- Johns Hopkins University (US)
- The Ohio State University (US)
- Corresponding author
- Patel, Tushar
- Venue
- Gastroenterology
- Publisher
- Elsevier BV
- Published
- 2006-06
- Volume
- 130
- Issue
- 7
- Pages
- 2113-2129
- ISSN
- 0016-5085 (ISSN-L)
- OpenAlex
- W1990645475
- Cited by
- 984
- References
- 44
- Citations by year
- 2026: 9 · 2025: 19 · 2024: 13 · 2023: 24 · 2022: 26 · 2021: 27 · 2020: 22 · 2019: 28 · 2018: 27 · 2017: 49 · 2016: 60 · 2015: 64 · 2014: 86 · 2013: 76 · 2012: 65
- FWCI
- 27.56
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Gastroenterology (publishedVersion)
- PubMed (publishedVersion)
- OakTrust (Texas A&M University Libraries) (submittedVersion)
- Funders
- National Institutes of Health
- National Institute of Diabetes and Digestive and Kidney Diseases (DK-069370, R01DK069370)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
- Health Sciences › Medicine › Surgery › Cholangiocarcinoma and Gallbladder Cancer Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
- Keywords
- microRNA, cholangiocarcinoma, miR-21, miR-200b, miR-141, gemcitabine, chemotherapy response, tumor cell proliferation, PTEN, PI3K signaling, apoptosis, miRNA expression profiling, cholangiocytes, xenografts, therapeutic target
- MeSH terms
- Gemcitabine, Animals, Deoxycytidine, Humans, Male, Mice, Nude, Probability, Sampling Studies, Sensitivity and Specificity, Transfection, Transplantation, Heterologous, Blotting, Northern, Blotting, Western, Gene Expression Regulation, Neoplastic, Apoptosis, Cholangiocarcinoma, Reverse Transcriptase Polymerase Chain Reaction, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, MicroRNAs, Cell Line, Tumor, Cell Proliferation, Mice
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