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Am J Pathol ; 186(9): 2271-8, 2016 09.
Artigo em Inglês | MEDLINE | ID: mdl-27470713

RESUMO

The conserved RNA-binding protein Musashi1 (MSI1) has been characterized as a stem cell marker, controlling the balance between self-renewal and differentiation and as a key oncogenic factor in numerous solid tumors, including glioblastoma. To explore the potential use of MSI1 targeting in therapy, we studied MSI1 in the context of radiation sensitivity. Knockdown of MSI1 led to a decrease in cell survival and an increase in DNA damage compared to control in cells treated with ionizing radiation. We subsequently examined mechanisms of double-strand break repair and found that loss of MSI1 reduces the frequency of nonhomologous end-joining. This phenomenon could be attributed to the decreased expression of DNA-protein kinase catalytic subunit, which we have previously identified as a target of MSI1. Collectively, our results suggest a role for MSI1 in double-strand break repair and that its inhibition may enhance the effect of radiotherapy.


Assuntos
Reparo do DNA/fisiologia , Glioblastoma/patologia , Proteínas do Tecido Nervoso/metabolismo , Polinucleotídeo 5'-Hidroxiquinase/metabolismo , Proteínas de Ligação a RNA/metabolismo , Tolerância a Radiação/fisiologia , Domínio Catalítico/fisiologia , Linhagem Celular Tumoral , Ensaio Cometa , Quebras de DNA de Cadeia Dupla/efeitos da radiação , DNA Catalítico , Imunofluorescência , Humanos , Immunoblotting , Reação em Cadeia da Polimerase
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