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2017 ; 7
(1
): 11351
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Selective tubular activation of hypoxia-inducible factor-2? has dual effects on
renal fibrosis
#MMPMID28900259
Kong KH
; Oh HJ
; Lim BJ
; Kim M
; Han KH
; Choi YH
; Kwon K
; Nam BY
; Park KS
; Park JT
; Han SH
; Yoo TH
; Lee S
; Kim SJ
; Kang DH
; Choi KB
; Eremina V
; Quaggin SE
; Ryu DR
; Kang SW
Sci Rep
2017[Sep]; 7
(1
): 11351
PMID28900259
show ga
Hypoxia-inducible factor (HIF) is a key transcriptional factor in the response to
hypoxia. Although the effect of HIF activation in chronic kidney disease (CKD)
has been widely evaluated, the results have been inconsistent until now. This
study aimed to investigate the effects of HIF-2? activation on renal fibrosis
according to the activation timing in inducible tubule-specific transgenic mice
with non-diabetic CKD. HIF-2? activation in renal tubular cells upregulated mRNA
and protein expressions of fibronectin and type 1 collagen associated with the
activation of p38 mitogen-activated protein kinase. In CKD mice, activation of
HIF-2? at the beginning of CKD significantly aggravated renal fibrosis, whereas
it did not lead to renal dysfunction. However, activation at a late-stage of CKD
abrogated both renal dysfunction and fibrosis, which was associated with
restoration of renal vasculature and amelioration of hypoxia through increased
renal tubular expression of VEGF and its isoforms. As with tubular cells with
HIF-2? activation, those under hypoxia also upregulated VEGF, fibronectin, and
type 1 collagen expressions associated with HIF-1? activation. In conclusion,
late-stage renal tubular HIF-2? activation has protective effects on renal
fibrosis and the resultant renal dysfunction, thus it could represent a
therapeutic target in late stage of CKD.