A genome-wide miRNA screen revealed miR-603 as a MGMT-regulating miRNA in glioblastomas
| Autor: | Bob S. Carter, Tyler Steed, Valya Ramakrishnan, Diahnn Futalan, Clark C. Chen, Dipanjan Chowdhury, Jann N. Sarkaria, Tao Jiang, Deepa Kushwaha, Kimberly Ng, Thien Nguyen, Johnny C. Akers |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
DNA repair
Biology Transfection miRNA cooperativity Complementary DNA microRNA medicine Temozolomide Biomarkers Tumor Humans Luciferase neoplasms DNA Modification Methylases Cell Proliferation Cell growth Brain Neoplasms Tumor Suppressor Proteins Cancer medicine.disease Prognosis Molecular biology digestive system diseases Gene Expression Regulation Neoplastic MicroRNAs DNA Repair Enzymes Oncology Cancer research Glioblastoma MGMT medicine.drug Priority Research Paper |
| Zdroj: | Oncotarget |
| ISSN: | 1949-2553 |
| Popis: | // Deepa Kushwaha 1,* , Valya Ramakrishnan 2,* , Kimberly Ng 1 , Tyler Steed 2 ,Thien Nguyen 2 , Diahnn Futalan 2 , Johnny C. Akers 2 , Jann Sarkaria 3 , Tao Jiang 4 , Dipanjan Chowdhury 1 , Bob S. Carter 2 and Clark C. Chen 2 1 Dept. of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA 2 Center for Theoretical and Applied Neuro-Oncology, Moores Cancer Center, Division of Neurosurgery, University of California San Diego, San Diego, CA 3 Mayo Clinic, Department of Radiation Oncology, Rochester, MN 4 Department of Neurosurgery, Tiantan Medical Center, Beijing, China * These authors contributed equally as first authors Correspondence: Clark Chen, email: // Keywords : microRNA, Glioblastoma, MGMT, Temozolomide, miRNA cooperativity Received : May 5, 2014 Accepted : May 12, 2014 Published : May 14, 2014 Abstract MGMT expression is a critical determinant for therapeutic resistance to DNA alkylating agents. We previously demonstrated that MGMT expression is post-transcriptionally regulated by miR-181d and other miRNAs. Here, we performed a genome-wide screen to identify MGMT regulating miRNAs. Candidate miRNAs were further tested for inverse correlation with MGMT expression in clinical specimens. We identified 15 candidate miRNAs and characterized the top candidate, miR-603. Transfection of miR-603 suppressed MGMT mRNA/protein expression in vitro and in vivo ; this effect was reversed by transfection with antimiR-603. miR-603 affinity-precipitated with MGMT mRNA and suppressed luciferase activity in an MGMT-3’UTR-luciferase assay, suggesting direct interaction between miR-603 and MGMT 3’UTR. miR-603 transfection enhanced the temozolomide (TMZ) sensitivity of MGMT-expressing glioblastoma cell lines. Importantly, miR-603 mediated MGMT suppression and TMZ resistance were reversed by expression of an MGMT cDNA. In a collection of 74 clinical glioblastoma specimens, both miR-603 and miR-181d levels inversely correlated with MGMT expression. Moreover, a combined index of the two miRNAs better reflected MGMT expression than each individually. These results suggest that MGMT is co-regulated by independent miRNAs. Characterization of these miRNAs should contribute toward strategies for enhancing the efficacy of DNA alkylating agents. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|