title: MicroRNA-27a distinguishes glioblastoma multiforme from diffuse and anaplastic astrocytomas and has prognostic value.
abstract: MicroRNAs (miRNAs) are a class of small noncoding RNAs that bind to 3'-untranslated (UTR) regions of target messenger RNAs to regulate protein synthesis. Reports have suggested that a set of specific miRNAs may be used as diagnostic and/or prognostic markers for astrocytoma grading. However, there are few studies of the specific miRNAs differentially expressed in each astrocytoma grade. MiRNA-containing total RNA was isolated from archived formalin-fixed, paraffin-embedded (FFPE) samples from WHO grade II-IV astrocytoma patients. The RNA was labeled and hybridized to Affymetrix miRNA 2.0 arrays. Statistical analysis identified several miRNAs differentially expressed in each astrocytoma grade. In particular, miR-27a, miR-210, and miR-1225-5p expression levels were able to differentiate grade IV from grade II and III astrocytomas as confirmed by real-time PCR. Kaplan-Meier survival analysis showed that disease progression occurred faster for Glioblastoma Multiforme (GBM) patients with a lower miR-27a expression level. Transfection of CRL-1690 GBM human cancer cells with a miR-27a oligonucleotide inhibitor followed by Real-time PCR identified six potential miR-27a target genes. Furthermore, the miR-27a oligonucleotide inhibitor induced CRL-1690 cell apoptosis. Taken together, our results provide additional miRNA signatures for distinguishing GBM from lower astrocytoma grades and suggest miR-27a as a prognostic and therapeutic target for GBM.
authors: Comprehensive Cancer Center, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935 ; Department of Biochemistry, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935.
authors: Mónica
authors: M
authors: Rivera-Díaz
authors: Comprehensive Cancer Center, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935 ; Department of Biology, University of Puerto Rico, Rio Piedras Campus San Juan, Puerto Rico 00927.
authors: Miguel A
authors: MA
authors: Miranda-Román
authors: Comprehensive Cancer Center, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935 ; Department of Biology, University of Puerto Rico, Rio Piedras Campus San Juan, Puerto Rico 00927.
authors: Daniel
authors: D
authors: Soto
authors: Comprehensive Cancer Center, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935 ; Department of Pathology and Laboratory Medicine, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935.
authors: Mario
authors: M
authors: Quintero-Aguilo
authors: Department of Computer Science, University of Puerto Rico, Rio Piedras Campus San Juan, Puerto Rico 00927.
authors: Humberto
authors: H
authors: Ortiz-Zuazaga
authors: Department of Pathology and Laboratory Medicine, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935.
authors: María J
authors: MJ
authors: Marcos-Martinez
authors: Comprehensive Cancer Center, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935 ; Department of Biochemistry, Medical Sciences Campus, University of Puerto Rico San Juan, Puerto Rico 00935.
authors: Pablo E
authors: PE
authors: Vivas-Mejía
keywords: astrocytoma; glioblastoma multiforme; miR-27a; microRNAs
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