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abstract:
Basic research

MiR-21, miR-34a, miR-125b, miR-181d and miR-648 levels inversely correlate with MGMT and TP53 expression in primary glioblastoma patients

Dorota Jesionek-Kupnicka, Marcin Braun, Berenika Trąbska-Kluch, Joanna Czech, Małgorzata Szybka, Bożena Szymańska, Dominika Kulczycka-Wojdala, Michał Bieńkowski, Radzisław Kordek, Izabela Zawlik

Arch Med Sci
Online publish date: 2017/07/31
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Introduction: TP53 and MGMT alterations play a crucial role in glioblastoma (GB) pathogenesis. TP53 and MGMT function is affected by several pathologic mechanisms, such as point mutations or promoter methylation, which are well characterized. Expression of both genes can be regulated by other mechanisms as well, e.g., microRNAs (miRNAs). Moreover, cross-talk among various pathologic processes may occur, further affecting MGMT and TP53 functionality.


Material and methods: In 49 GB patients, we analyzed the possible associations between TP53 and its miRNA regulators miR-125b, miR-21, and miR-34a, as well as MGMT and its miRNA regulators miR-181d and miR-648. We evaluated the possible influence of mutational and methylation status on the pre-identified associations.


Results: In patients with immunohistochemistry-detected TP53 overexpression, expression levels of miR-34a and TP53 were negatively correlated (r = –0.56, p = 0.0195), and in patients with TP53 mutations, expression levels of TP53 and miR-21 were negatively correlated (r = –0.67, p = 0.0330). In patients with MGMT methylation, expression levels of MGMT were negatively correlated with miR-648 and miR-125b expression levels (r = –0.61, p = 0.0269 and r = –0.34, p = 0.0727, respectively).


Conclusions: Our findings demonstrate that selected miRNAs are significantly correlated with MGMT and TP53 levels, but the extent of this correlation differs regarding the TP53 and MGMT mutational and promoter methylation status.
keywords:

GB, MGMT, TP53, O6-methylguanine-DNA methyltransferase, microRNA

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