The selective Aurora-A kinase inhibitor MLN8237 (alisertib) potently inhibits proliferation of glioblastoma neurosphere tumor stem-like cells and potentiates the effects of temozolomide and ionizing radiation.

Abstract:

:The selective Aurora-A kinase inhibitor MLN8237 is in clinical trials for hematologic malignancies, ovarian cancer and other solid tumors. We previously showed that MLN8237 is potently antiproliferative toward standard monolayer-cultured glioblastoma cells. We have now investigated the effect of MLN8237 with and without temozolomide or ionizing radiation on the proliferation of glioblastoma tumor stem-like cells (neurospheres) using soft agar colony formation assays and normal human astrocytes by MTT assay. Western blotting was utilized to compare MLN8237 IC50s to cellular Aurora-A and phosphoThr(288)Aurora-A levels. MLN8237 was more potently antiproliferative to neurosphere cells than to standard monolayer glioma cells, and was non-toxic to normal human astrocytes. Western blot analysis revealed that MLN8237 treatment inhibits phosphoThr(288)Aurora-A levels providing proof of drug target-hit in glioblastoma cells. Furthermore, phosphoThr(288)Aurora-A levels partially predicted the antiproliferative efficacy of MLN8237. We also found that Aurora-A inhibition by MLN8237 was synergistic with temozolomide and potentiated the effects of ionizing radiation on colony formation in neurosphere glioblastoma tumor stem-like cells. These results further support the potential of Aurora-A inhibitors as primary chemotherapy agents or biologic response modifiers in glioblastoma patients.

authors

Hong X,O'Donnell JP,Salazar CR,Van Brocklyn JR,Barnett KD,Pearl DK,deCarvalho AC,Ecsedy JA,Brown SL,Mikkelsen T,Lehman NL

doi

10.1007/s00280-014-2430-z

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

983-90

issue

5

eissn

0344-5704

issn

1432-0843

journal_volume

73

pub_type

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