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2016 ; 7
(34
): 54317-54328
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Prolyl hydroxylase 2 (PHD2) inhibition protects human renal epithelial cells and
mice kidney from hypoxia injury
#MMPMID27527871
Fang Y
; Zhang H
; Zhong Y
; Ding X
Oncotarget
2016[Aug]; 7
(34
): 54317-54328
PMID27527871
show ga
Prolyl hydroxylase domain protein 2 (PHD2) is a key oxygen sensor, setting low
steady-state level of hypoxia-inducible factor-? (HIF-?). Here, we showed that
treatment of cobalt chloride (CoCl2), a hypoxia mimic, in HK-2 tubular epithelial
cells induced PHD2 and HIF-1/2? expression as well as cell apoptosis and
autophagy activation. Three methyladenine (3-MA), the autophagy inhibitor,
blocked autophagy and protected HK-2 cells from CoCl2. Significantly, siRNA
knockdown of PHD2 also protected HK-2 cells from CoCl2,possibly via increasing
HIF-1? expression. Reversely, HIF-1? siRNA knockdown almost abolished
cytoprotection by PHD2 siRNA in CoCl2-treated HK-2 cells. In vivo, pretreatment
with a PHD inhibitor L-mimosine remarkably attenuated mice renal
ischemia-reperfusion injuries. Molecularly, L-mimosine inhibited apoptosis and
inflammatory responses in injured mice kidneys. Together, our results suggest
that PHD2 silence or inhibition protects human renal epithelial cells and mice
kidney from hypoxia injuries.