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2016 ; 7
(39
): 63374-63387
Nephropedia Template TP
gab.com Text
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English Wikipedia
Adrenomedullin blockade suppresses sunitinib-resistant renal cell carcinoma
growth by targeting the ERK/MAPK pathway
#MMPMID27556517
Gao Y
; Li J
; Qiao N
; Meng Q
; Zhang M
; Wang X
; Jia J
; Yang S
; Qu C
; Li W
; Wang D
Oncotarget
2016[Sep]; 7
(39
): 63374-63387
PMID27556517
show ga
PURPOSE: To evaluate the mechanisms underlying sunitinib resistance in RCC and to
identify targets that may be used to overcome this resistance. RESULTS:
Reanalysis of transcriptome microarray datasets (GSE64052 and GSE76068) showed
that adrenomedullin expression was increased in sunitinib-resistant tumors. And
adrenomedullin expression was increased in sunitinib-resistant tumor xenografts,
accompanied by upregulation of phospho-ERK levels. However, blocking
adrenomedullin inhibited sunitinib-resistant tumor growth. Treatment of RCC cells
with sunitinib and ADM22-52 was superior to monotherapy with either agent.
Additionally, adrenomedullin upregulated cAMP and activated the ERK/MAPK pathway,
promoting cell proliferation, while knockdown of adrenomedullin inhibited RCC
cell growth and invasion in vitro. MATERIALS AND METHODS: We searched the Gene
Expression Omnibus (GEO) database to find data regarding sunitinib-resistant RCC.
These data were subsequently reanalyzed to identify targets that contribute to
sunitinib resistance, and adrenomedullin upregulation was found to mediate
sunitinib resistance in RCC. Then, we created an RCC mouse xenograft model. Mice
were treated with sunitinib, an adrenomedullin receptor antagonist (ADM22-52), a
MEK inhibitor (PD98059) and different combinations of these three drugs to
investigate their effects on tumor growth. RCC cells (786-0) were cultured in
vitro and treated with an ADM22-52 or PD98059 to determine whether adrenomedullin
activates the ERK/MAPK pathway. Adrenomedullin was knocked down in 786-0 cells
via siRNA, and the effects of this knockdown on cell were subsequently
investigated. CONCLUSIONS: Adrenomedullin plays an important role in RCC
resistance to sunitinib treatment. The combination of sunitinib and an
adrenomedullin receptor antagonist may result in better outcomes in advanced RCC
patients.