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2015 ; 2015
(ä): 535686
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Renal oxidative stress induced by long-term hyperuricemia alters mitochondrial
function and maintains systemic hypertension
#MMPMID25918583
Cristóbal-García M
; García-Arroyo FE
; Tapia E
; Osorio H
; Arellano-Buendía AS
; Madero M
; Rodríguez-Iturbe B
; Pedraza-Chaverrí J
; Correa F
; Zazueta C
; Johnson RJ
; Lozada LG
Oxid Med Cell Longev
2015[]; 2015
(ä): 535686
PMID25918583
show ga
We addressed if oxidative stress in the renal cortex plays a role in the
induction of hypertension and mitochondrial alterations in hyperuricemia. A
second objective was to evaluate whether the long-term treatment with the
antioxidant Tempol prevents renal oxidative stress, mitochondrial alterations,
and systemic hypertension in this model. Long-term (11-12 weeks) and short-term
(3 weeks) effects of oxonic acid induced hyperuricemia were studied in rats (OA,
750?mg/kg BW), OA+Allopurinol (AP, 150?mg/L drinking water), OA+Tempol (T,
15?mg/kg BW), or vehicle. Systolic blood pressure, renal blood flow, and vascular
resistance were measured. Tubular damage (urine N-acetyl-?-D-glucosaminidase) and
oxidative stress markers (lipid and protein oxidation) along with ATP levels were
determined in kidney tissue. Oxygen consumption, aconitase activity, and uric
acid were evaluated in isolated mitochondria from renal cortex. Short-term
hyperuricemia resulted in hypertension without demonstrable renal oxidative
stress or mitochondrial dysfunction. Long-term hyperuricemia induced
hypertension, renal vasoconstriction, tubular damage, renal cortex oxidative
stress, and mitochondrial dysfunction and decreased ATP levels. Treatments with
Tempol and allopurinol prevented these alterations. Renal oxidative stress
induced by hyperuricemia promoted mitochondrial functional disturbances and
decreased ATP content, which represent an additional pathogenic mechanism induced
by chronic hyperuricemia. Hyperuricemia-related hypertension occurs before these
changes are evident.