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2016 ; 7
(51
): 84839-84850
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gab.com Text
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English Wikipedia
H2O2 treatment or serum deprivation induces autophagy and apoptosis in naked
mole-rat skin fibroblasts by inhibiting the PI3K/Akt signaling pathway
#MMPMID27863375
Zhao S
; Li L
; Wang S
; Yu C
; Xiao B
; Lin L
; Cong W
; Cheng J
; Yang W
; Sun W
; Cui S
Oncotarget
2016[Dec]; 7
(51
): 84839-84850
PMID27863375
show ga
Naked mole-rats (NMR; Heterocephalus glaber) display extreme longevity and
resistance to cancer. Here, we examined whether autophagy contributes to the
longevity of NMRs by assessing the effects of the PI3K/Akt pathway inhibitor
LY294002 and the autophagy inhibitor chloroquine (CQ) on autophagy and apoptosis
in NMR skin fibroblasts. Serum starvation, H2O2 treatment, and LY294002 treatment
all increased the LC3-II/LC3-I ratio and numbers of double-membraned
autophagosomes and autophagic vacuoles, and decreased levels of p70S6K,
p-AktSer473, and p-AktThr308. By contrast, CQ treatment decreased p70S6K,
AktSer473, and AktThr308 levels. The Bax/Bcl-2 ratio increased after 12 h of
exposure to LY294002 or CQ. These data show that inhibiting the Akt pathway
promotes autophagy and apoptosis in NMR skin fibroblasts. Furthermore, LY294002
or CQ treatment decreased caspase-3, p53, and HIF1-? levels, suggesting that
serum starvation or H2O2 treatment increase autophagy and apoptosis in NMR skin
fibroblasts by inhibiting the PI3K/Akt pathway. CQ-induced inhibition of late
autophagy stages also prevented Akt activation and induced apoptosis. Finally,
the HIF-1? and p53 pathways were involved in serum starvation- or H2O2-induced
autophagy in NMR skin fibroblasts.