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2018 ; 18
(1
): 434
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Valproic acid sensitizes metformin-resistant human renal cell carcinoma cells by
upregulating H3 acetylation and EMT reversal
#MMPMID29665787
Wei M
; Mao S
; Lu G
; Li L
; Lan X
; Huang Z
; Chen Y
; Zhao M
; Zhao Y
; Xia Q
BMC Cancer
2018[Apr]; 18
(1
): 434
PMID29665787
show ga
BACKGROUND: Metformin (Met) is a widely available diabetic drug and shows
suppressed effects on renal cell carcinoma (RCC) metabolism and proliferation.
Laboratory studies in RCC suggested that metformin has remarkable antitumor
activities and seems to be a potential antitumor drug. But the facts that
metformin may be not effective in reducing the risk of RCC in cancer clinical
trials made it difficult to determine the benefits of metformin in RCC prevention
and treatment. The mechanisms underlying the different conclusions between
laboratory experiments and clinical analysis remains unclear. The goal of the
present study was to determine whether long-term metformin use can induce
resistance in RCC, whether metformin resistance could be used to explain the
disaccord in laboratory and clinical studies, and whether the drug valproic acid
(VPA), which inhibits histone deacetylase, exhibits synergistic cytotoxicity with
metformin and can counteract the resistance of metformin in RCC. METHODS: We
performed CCK8, transwell, wound healing assay, flow cytometry and western
blotting to detect the regulations of proliferation, migration, cell cycle and
apoptosis in 786-O, ACHN and metformin resistance 786-O (786-M-R) cells treated
with VPA, metformin or a combination of two drugs. We used TGF-?, SC79, LY294002,
Rapamycin, protein kinase B (AKT) inhibitor to treat the 786-O or 786-M-R cells
and detected the regulations in TGF-? /pSMAD3 and AMPK/AKT pathways. RESULTS:
786-M-R was refractory to metformin-induced antitumor effects on proliferation,
migration, cell cycle and cell apoptosis. AMPK/AKT pathways and TGF-?/SMAD3
pathways showed low sensibilities in 786-M-R. The histone H3 acetylation
diminished in the 786-M-R cells. However, the addition of VPA dramatically
upregulated histone H3 acetylation, increased the sensibility of AKT and
inhibited pSMAD3/SMAD4, letting the combination of VPA and metformin remarkably
reappear the anti-tumour effects of metformin in 786-M-R cells. CONCLUSIONS: VPA
not only exhibits synergistic cytotoxicity with metformin but also counteracts
resistance to metformin in renal cell carcinoma cell. The re-sensitization to
metformin induced by VPA in metformin-resistant cells may help treat renal cell
carcinoma patients.