Abstract |
Objective: Extracellular signal-regulated kinase 1 (ERK1) is an important signal transduction molecule in the ERK/ mitogen-activated protein kinase pathway. miR-132 downregulation is associated with colorectal cancer (CRC). However, whether it is related to drug resistance remains poorly understood. Bioinformatics analysis demonstrated the targeting relationship between miR-132 and ERK1 3'-UTR. This study investigated the role of miR-132 in regulating ERK1 expression and affecting CRC cell proliferation, apoptosis, and adriamycin (ADM) resistance. Materials and Methods: Dual luciferase reporter gene assay was used to evaluate the targeted relationship between miR-132 and ERK1. ADM-resistant cell lines Lovo/ADM and SW480/ADM were established followed by analysis of miR-132 and ERK1 expression levels, and cell proliferation by cell counting kit-8 assay. The impact of ADM on cell proliferation and apoptosis was assessed by 5-bromodeoxyuridine (EdU) staining and flow cytometry, respectively. Lovo/ADM and SW480/ADM cells were cultured in vitro and divided into two groups, including miR-NC group and miR-132 mimic group. Results: There was a targeted regulatory relationship between miR-132 and ERK1 mRNA. The miR-132 expression was significantly lower, whereas ERK1 mRNA and protein expression levels were significantly higher in Lovo/ADM and SW480/ADM cells than those in Lovo and SW480 cells. Transfection of miR-132 mimic significantly reduced the expression of ERK1 in Lovo/ADM and SW480/ADM cells, enhanced cell apoptosis, and weakened cell proliferation. Conclusions: miR-132 reduction and ERK1 elevation are related to ADM resistance in CRC cells. Upregulation of miR-132 expression inhibits CRC cell proliferation, induces apoptosis, and reduces ADM resistance possibly by targeting ERK1 expression.
|
Authors | Yong Liu, Mei Zhang |
Journal | Cancer biotherapy & radiopharmaceuticals
(Cancer Biother Radiopharm)
Vol. 34
Issue 6
Pg. 398-404
(Aug 2019)
ISSN: 1557-8852 [Electronic] United States |
PMID | 30939040
(Publication Type: Journal Article, Retracted Publication)
|
Chemical References |
- Antibiotics, Antineoplastic
- MIRN132 microRNA, human
- MicroRNAs
- Doxorubicin
- MAPK3 protein, human
- Mitogen-Activated Protein Kinase 3
|
Topics |
- Antibiotics, Antineoplastic
(pharmacology)
- Apoptosis
- Cell Movement
- Cell Proliferation
- Colorectal Neoplasms
(drug therapy, genetics, metabolism, pathology)
- Doxorubicin
(pharmacology)
- Drug Resistance, Neoplasm
- Gene Expression Regulation, Neoplastic
(drug effects)
- Humans
- MicroRNAs
(genetics)
- Mitogen-Activated Protein Kinase 3
(antagonists & inhibitors, genetics, metabolism)
- Tumor Cells, Cultured
|