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2016 ; 7
(48
): 78787-78803
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Metformin treatment reduces temozolomide resistance of glioblastoma cells
#MMPMID27791206
Yang SH
; Li S
; Lu G
; Xue H
; Kim DH
; Zhu JJ
; Liu Y
Oncotarget
2016[Nov]; 7
(48
): 78787-78803
PMID27791206
show ga
It has been reported that metformin acts synergistically with temozolomide (TMZ)
to inhibit proliferation of glioma cells including glioblastoma multiforme (GBM).
However, the molecular mechanism underlying how metformin exerts its anti-cancer
effects remains elusive. We used a combined experimental and bioinformatics
approach to identify genes and complex regulatory/signal transduction networks
that are involved in restoring TMZ sensitivity of GBM cells after metformin
treatment. First, we established TMZ resistant GBM cell lines and found that the
resistant cells regained TMZ sensitivity after metformin treatment. We further
identified that metformin down-regulates SOX2 expression in TMZ-resistant glioma
cells, reduces neurosphere formation capacity of glioblastoma cells, and inhibits
GBM xenograft growth in vivo. Finally, the global gene expression profiling data
reveals that multiple pathways are involved in metformin treatment related gene
expression changes, including fatty acid metabolism and RNA binding and splicing
pathways. Our work provided insight of the mechanisms on potential synergistic
effects of TMZ and metformin in the treatment of glioblastoma, which will in turn
yield potentially translational value for clinical applications.