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2015 ; 15
(ä): 462
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Combined inhibition of the cell cycle related proteins Wee1 and Chk1/2 induces
synergistic anti-cancer effect in melanoma
#MMPMID26054341
Magnussen GI
; Emilsen E
; Giller Fleten K
; Engesæter B
; Nähse-Kumpf V
; Fjær R
; Slipicevic A
; Flørenes VA
BMC Cancer
2015[Jun]; 15
(ä): 462
PMID26054341
show ga
BACKGROUND: Malignant melanoma has an increasing incidence rate and the
metastatic disease is notoriously resistant to standard chemotherapy. Loss of
cell cycle checkpoints is frequently found in many cancer types and makes the
cells reliant on compensatory mechanisms to control progression. This feature may
be exploited in therapy, and kinases involved in checkpoint regulation, such as
Wee1 and Chk1/2, have thus become attractive therapeutic targets. METHODS: In the
present study we combined a Wee1 inhibitor (MK1775) with Chk1/2 inhibitor
(AZD7762) in malignant melanoma cell lines grown in vitro (2D and 3D cultures)
and in xenografts models. RESULTS: Our in vitro studies showed that combined
inhibition of Wee1 and Chk1/2 synergistically decreased viability and increased
apoptosis (cleavage of caspase 3 and PARP), which may be explained by
accumulation of DNA-damage (increased expression of ?-H2A.X)--and premature
mitosis of S-phase cells. Compared to either inhibitor used as single agents,
combined treatment reduced spheroid growth and led to greater tumour growth
inhibition in melanoma xenografts. CONCLUSIONS: These data provide a rationale
for further evaluation of the combination of Wee1 and Chk1/2 inhibitors in
malignant melanoma.