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-modulated enzymes protect during
acute renal failure
1 Division of Nephrology, Department of Internal Medicine, University of Arkansas for Medical Sciences and John McClellan Memorial Veterans Hospital, Little Rock, Arkansas 72205; 2 Department of Pathology, Duke University Medical Center Durham, North Carolina 27710; 3 Laboratory of Metabolism, National Cancer Institute, Bethesda, Maryland 20892; and 4 Department of Geriatrics, University of Arkansas for Medical Sciences and John McClellan Memorial Veterans Hospital, Little Rock, Arkansas 72205
Regulation of fatty acid
-oxidation (FAO) represents an important mechanism for a sustained
balance of energy production/utilization in kidney tissue.
To examine the role of stimulated FAO during ischemia, Etomoxir
(Eto), clofibrate, and WY-14,643 compounds were given 5 days prior to
the induction of ischemia/reperfusion (I/R) injury. Compared
with rats administered vehicle, Eto-, clofibrate-, and WY-treated rats
had lower blood urea nitrogen and serum creatinines following I/R
injury. Histological analysis confirmed a significant amelioration of
acute tubular necrosis. I/R injury led to a threefold reduction of mRNA
and protein levels of acyl CoA oxidase (AOX) and cytochrome P4A1, as
well as twofold inhibition of their enzymatic activities. Eto treatment
prevented the reduction of mRNA and protein levels and the inhibition
of the enzymatic activities of these two peroxisome
proliferator-activated receptor-
(PPAR
) target genes during I/R
injury. PPAR
null mice subjected to I/R injury demonstrated
significantly enhanced cortical necrosis and worse kidney function
compared with wild-type controls. These results suggest that
upregulation of PPAR
-modulated FAO genes has an important role in
the observed cytoprotection during I/R injury.
carnitine palmitoyltransferase; fatty acid oxidation; ischemia/reperfusion
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