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2014 ; 3
(6
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
The Role of Hypoxia-Inducible Factor/Prolyl Hydroxylation Pathway in
Deoxycorticosterone Acetate/Salt Hypertension in the Rat
#MMPMID26185735
Dallatu MK
; Nwokocha E
; Agu N
; Myung C
; Newaz MA
; Garcia G
; Truong LD
; Oyekan AO
J Hypertens (Los Angel)
2014[Dec]; 3
(6
): ä PMID26185735
show ga
KKidney disease could result from hypertension and ischemia/hypoxia. Key
mediators of cellular adaptation to hypoxia are oxygen-sensitive hypoxia
inducible factor (HIF)s which are regulated by prolyl-4-hydroxylase domain
(PHD)-containing dioxygenases. However, HIF activation can be protective as in
ischemic death or promote renal fibrosis in chronic conditions. This study tested
the hypothesis that increased HIF-1? consequent to reduced PHD expression
contributes to the attendant hypertension and target organ damage in
deoxycorticosterone acetate (DOCA)/salt hypertension and that PHD inhibition
ameliorates this effect. In rats made hypertensive by DOCA/salt treatment (DOCA
50 mg/kg s/c; 1% NaCl orally), PHD inhibition with dimethyl oxallyl glycine
(DMOG) markedly attenuated hypertension (P<0.05), proteinuria (P<0.05) and
attendant tubular interstitial changes and glomerular damage (P<0.05).
Accompanying these changes, DMOG blunted the increased expression of kidney
injury molecule (KIM)-1 (P<0.05), a marker of tubular injury and reversed the
decreased expression of nephrin (P<0.05), a marker of glomerular injury. DMOG
also decreased collagen I staining (P<0.05), increased serum nitrite (P<0.05) and
decreased serum 8-isopostane (P<0.05). However, the increased HIF-1? expression
(P<0.01) and decreased PHD2 expression (P<0.05) in DOCA/salt hypertensive rats
was not affected by DMOG. These data suggest that reduced PHD2 expression with
consequent increase in HIF-1? expression probably results from hypoxia induced by
DOCA/salt treatment with the continued hypoxia and reduced PHD2 expression
evoking hypertensive renal injury and collagen deposition at later stages.
Moreover, a PHD inhibitor exerted a protective effect in DOCA/salt hypertension
by mechanisms involving increased nitric oxide production and reduced production
of reactive oxygen species.