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Published in: Journal of Neuro-Oncology 2/2018

01-09-2018 | Laboratory Investigation

Down-regulation of MDR1 by Ad-DKK3 via Akt/NFκB pathways augments the anti-tumor effect of temozolomide in glioblastoma cells and a murine xenograft model

Authors: Toshitaka Fujihara, Yoshifumi Mizobuchi, Kohei Nakajima, Teruyoshi Kageji, Kazuhito Matsuzaki, Keiko T. Kitazato, Ryotaro Otsuka, Keijiro Hara, Hideo Mure, Toshiyuki Okazaki, Kazuyuki Kuwayama, Shinji Nagahiro, Yasushi Takagi

Published in: Journal of Neuro-Oncology | Issue 2/2018

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Abstract

Background

Glioblastoma multiforme (GBM) is the most malignant of brain tumors. Acquired drug resistance is a major obstacle for successful treatment. Earlier studies reported that expression of the multiple drug resistance gene (MDR1) is regulated by YB-1 or NFκB via the JNK/c-Jun or Akt pathway. Over-expression of the Dickkopf (DKK) family member DKK3 by an adenovirus vector carrying DKK3 (Ad-DKK3) exerted anti-tumor effects and led to the activation of the JNK/c-Jun pathway. We investigated whether Ad-DKK3 augments the anti-tumor effect of temozolomide (TMZ) via the regulation of MDR1.

Methods

GBM cells (U87MG and U251MG), primary TGB105 cells, and mice xenografted with U87MG cells were treated with Ad-DKK3 or TMZ alone or in combination.

Results

Ad-DKK3 augmentation of the anti-tumor effects of TMZ was associated with reduced MDR1 expression in both in vivo and in vitro studies. The survival of Ad-DKK3-treated U87MG cells was inhibited and the expression of MDR1 was reduced. This was associated with the inhibition of Akt/NFκB but not of YB-1 via the JNK/c-Jun- or Akt pathway.

Conclusions

Our results suggest that Ad-DKK3 regulates the expression of MDR1 via Akt/NFκB pathways and that it augments the anti-tumor effects of TMZ in GBM cells.
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Metadata
Title
Down-regulation of MDR1 by Ad-DKK3 via Akt/NFκB pathways augments the anti-tumor effect of temozolomide in glioblastoma cells and a murine xenograft model
Authors
Toshitaka Fujihara
Yoshifumi Mizobuchi
Kohei Nakajima
Teruyoshi Kageji
Kazuhito Matsuzaki
Keiko T. Kitazato
Ryotaro Otsuka
Keijiro Hara
Hideo Mure
Toshiyuki Okazaki
Kazuyuki Kuwayama
Shinji Nagahiro
Yasushi Takagi
Publication date
01-09-2018
Publisher
Springer US
Published in
Journal of Neuro-Oncology / Issue 2/2018
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-018-2894-5

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