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2016 ; 6
(ä): 36544
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Probing the PI3K/Akt/mTor pathway using (31)P-NMR spectroscopy: routes to
glycogen synthase kinase 3
#MMPMID27811956
Phyu SM
; Tseng CC
; Fleming IN
; Smith TA
Sci Rep
2016[Nov]; 6
(ä): 36544
PMID27811956
show ga
Akt is an intracellular signalling pathway that serves as an essential link
between cell surface receptors and cellular processes including proliferation,
development and survival. The pathway has many downstream targets including
glycogen synthase kinase3 which is a major regulatory kinase for cell cycle
transit as well as controlling glycogen synthase activity. The Akt pathway is
frequently up-regulated in cancer due to overexpression of receptors such as the
epidermal growth factor receptor, or mutation of signalling pathway kinases
resulting in inappropriate survival and proliferation. Consequently anticancer
drugs have been developed that target this pathway. MDA-MB-468 breast and HCT8
colorectal cancer cells were treated with inhibitors including LY294002, MK2206,
rapamycin, AZD8055 targeting key kinases in/associated with Akt pathway and the
consistency of changes in (31)P-NMR-detecatable metabolite content of tumour
cells was examined. Treatment with the Akt inhibitor MK2206 reduced
phosphocholine levels in MDA-MB-468 cells. Treatment with either the
phosphoinositide-3-kinase inhibitor, LY294002 and pan-mTOR inhibitor, AZD8055 but
not pan-Akt inhibitor MK2206 increased uridine-5'-diphosphate-hexose cell content
which was suppressed by co-treatment with glycogen synthase kinase 3 inhibitor
SB216763. This suggests that there is an Akt-independent link between
phosphoinositol-3-kinase and glycogen synthase kinase3 and demonstrates the
potential of (31)P-NMR to probe intracellular signalling pathways.