Programmed Cell Death 4 (PDCD4) Is an Important Functional Target of the MicroRNA miR-21 in Breast Cancer Cells
Open accessAbstract
MicroRNAs are emerging as important regulators of cancer-related processes. The miR-21 microRNA is overexpressed in a wide variety of cancers and has been causally linked to cellular proliferation, apoptosis, and migration. Inhibition of mir-21 in MCF-7 breast cancer cells causes reduced cell growth. Using array expression analysis of MCF-7 cells depleted of miR-21, we have identified mRNA targets of mir-21 and have shown a link between miR-21 and the p53 tumor suppressor protein. We furthermore found that the tumor suppressor protein Programmed Cell Death 4 (PDCD4) is regulated by miR-21 and demonstrated that PDCD4 is a functionally important target for miR-21 in breast cancer cells.
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Several mRNAs regulated by miR-21 and anti-miR-21 in glioma cells, including PDCD4, APAF1, FAM3C, SESN1, and GLCCI1, were also identified in an mRNA expression analysis of miR-21 knocked-down MCF7 breast carcinoma cells.
“Several mRNAs regulated by miR-21 and anti-miR-21 in glioma cells (Fig. 3; also see Table S1 in the supplemental material) have recently been identified in an mRNA expression analysis of miR-21 knocked-down MCF7 breast carcinoma cells (14).”
From MicroRNA 21 Promotes Glioma Invasion by Targeting Matrix Metalloproteinase Regulators (2008) · cites this paper as [14]
miR-21 is upregulated in most solid tumors, including breast, colorectal and glioma.
“It is upregulated in most solid tumors, including breast, colo-rectal and glioma [5, 10, 12].”
From MicroRNA‐21 protects neurons from ischemic death (2010) · cites this paper as [10]
miR-21 has been shown to be a strong antiapoptotic factor.
“In particular, miRNA-21 (miR-21) has been shown to be a strong antiapoptotic factor [5, 9–11].”
From MicroRNA‐21 protects neurons from ischemic death (2010) · cites this paper as [10]
APAF1, BMPR2, PDCD4, and p21 are up-regulated in MCF-7 breast cancer cells with LNA-miR-21 treatment.
“A subset of the derepressed transcripts, APAF1, BMPR2, PDCD4, and p21 were reported to be up-regulated in MCF-7 breast cancer cells with LNA-miR-21 treatment (15).”
From MicroRNA-21 Targets a Network of Key Tumor-Suppressive Pathways in Glioblastoma Cells (2008) · cites this paper as [15]
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 [15]
Regulation of p53-related targets by miR-21 may explain previous observations in breast cancer cells where p53-transactivated genes were up-regulated in response to miR-21 down-regulation.
“Regulation of these p53-related targets by miR-21 may potentially explain previous observations in breast cancer cells, where p53-transactivated genes were up-regulated in response to miR-21 down-regulation (15).”
From MicroRNA-21 Targets a Network of Key Tumor-Suppressive Pathways in Glioblastoma Cells (2008) · cites this paper as [15]
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- Authors
- Frankel, L. B., Christoffersen, N. R., Jacobsen, A., Lindow, M., Krogh, A., & Lund, A. H.
- Affiliations
- University of Copenhagen (DK)
- Corresponding author
- Lund, Anders H.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2008-01
- Volume
- 283
- Issue
- 2
- Pages
- 1026-1033
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2069104846
- Cited by
- 1,141
- References
- 9
- Citations by year
- 2026: 14 · 2025: 20 · 2024: 18 · 2023: 31 · 2022: 35 · 2021: 39 · 2020: 51 · 2019: 48 · 2018: 51 · 2017: 56 · 2016: 68 · 2015: 92 · 2014: 89 · 2013: 87 · 2012: 88
- FWCI
- 28.59
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion)
- Funders
- Rigshospitalet
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Keywords
- PDCD4, miR-21, microRNA target regulation, breast cancer, MCF-7 cells, p53, tumor suppressor proteins, cell proliferation, gene expression profiling
- MeSH terms
- Base Sequence, Breast Neoplasms, Cell Division, Female, Humans, Kinetics, RNA, Neoplasm, RNA-Binding Proteins, Apoptosis, MicroRNAs, Cell Line, Tumor, Apoptosis Regulatory Proteins
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