Combination of a STAT3 Inhibitor and an mTOR Inhibitor Against a Temozolomide-resistant Glioblastoma Cell Line.

Abstract:

BACKGROUND:Temozolomide-resistant (TMZ-R) glioblastoma is very difficult to treat, and a novel approach to overcome resistance is needed. MATERIALS AND METHODS:The efficacy of a combination treatment of STAT3 inhibitor, STX-0119, with rapamycin was investigated against our established TMZ-resistant U87 cell line. RESULTS:The growth-inhibitory effect of the combination treatment was significant against the TMZ-R U87 cell line (IC50: 78 μM for STX-0119, 30.5 μM for rapamycin and 11.3 μM for combination of the two). Western blotting analysis demonstrated that the inhibitory effect of STX-0119 on S6 and 4E-BP1 activation through regulation of YKL-40 expression occurred in addition to the inhibitory effect of rapamycin against the mTOR pathway. CONCLUSION:These results suggest that the STAT3 pathway is associated with the mTOR downstream pathway mediated by YKL-40 protein, and the combination therapy of the STAT3 inhibitor and rapamycin could be worth developing as a novel therapeutic approach against TMZ-resistant relapsed gliomas.

authors

Miyata H,Ashizawa T,Iizuka A,Kondou R,Nonomura C,Sugino T,Urakami K,Asai A,Hayashi N,Mitsuya K,Nakasu Y,Yamaguchi K,Akiyama Y

doi

10.21873/cgp.20021

subject

Has Abstract

pub_date

2017-01-02 00:00:00

pages

83-91

issue

1

eissn

1109-6535

issn

1790-6245

pii

14/1/83

journal_volume

14

pub_type

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