Vol 25, No 5 (2020)
Original research articles
Published online: 2020-09-01

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Apoptosis related microRNAs and MGMT in glioblastoma cell lines submitted to treatments with ionizing radiation and temozolomide

Felipe Amstalden Trevisan1, Andressa Romualdo Rodrigues2, Fermino Sanches Lizarte Neto1, Fernanda Maris Peria3, Múcio Luiz Cirino1, Daniela Pretti Tirapelli1, Carlos Gilberto Carlotti Júnior1
DOI: 10.1016/j.rpor.2020.06.007
Rep Pract Oncol Radiother 2020;25(5):714-719.



To evaluate the effect of radiotherapy and temozolomide on the expression of miRNAs apoptotic (miRNAs-21, -221, -222 (anti-apoptotic) and miRNAs-15a, -16 (pro-apoptotic)) and the gene MGMT in glioblastoma cell lines.


The limited knowledge of the molecular biology of malignant gliomas may hinder the development of therapeutic modalities. In this scenario, one of the greatest advances of recent years was the identification of microRNAs. These molecules have an important role in biological processes involving cancer, including glioblastoma.

Materials and methods

Trypan blue was used to verify the cell viability, and real time PCR to quantify the expression of microRNAs and gene 24, 48 and 120 h after exposure to treatments.


There was a statistically significant decrease of expression of miR-15a between 48 and 120 h in line T98 G treated with radiation, increased expression of miR-15a between 24 and 120 h in line U251 treated with radiation and temozolomide, and increased expression of miR-16 between 24 and 120 h in line U251 treated with radiation alone and when combined with temozolomide. There was a decrease in MGMT gene expression, between 24 and 48 h in U343 cells treated with temozolomide.


Ionizing radiation and temozolomide modified the expression of miRNAs studied and MGMT.

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Reports of Practical Oncology and Radiotherapy