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2016 ; 11
(8
): e0161706
Nephropedia Template TP
gab.com Text
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English Wikipedia
Effects of Single and Combined Losartan and Tempol Treatments on Oxidative
Stress, Kidney Structure and Function in Spontaneously Hypertensive Rats with
Early Course of Proteinuric Nephropathy
#MMPMID27560781
Karanovic D
; Grujic-Milanovic J
; Miloradovic Z
; Ivanov M
; Jovovic D
; Vajic UJ
; Zivotic M
; Markovic-Lipkovski J
; Mihailovic-Stanojevic N
PLoS One
2016[]; 11
(8
): e0161706
PMID27560781
show ga
Oxidative stress has been widely implicated in both hypertension and chronic
kidney disease (CKD). Hypertension is a major risk factor for CKD progression. In
the present study we have investigated the effects of chronic single tempol
(membrane-permeable radical scavenger) or losartan (angiotensin II type 1
receptor blocker) treatment, and their combination on systemic oxidative status
(plasma thiobarbituric acid-reactive substances (pTBARS) production, plasma
antioxidant capacity (2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid,
pABTS), erythrocyte antioxidant enzymes activities) and kidney oxidative stress
(kTBARS, kABTS, kidney antioxidant enzymes activities), kidney function and
structure in spontaneously hypertensive rats (SHR) with the early course of
adriamycin-induced nephropathy. Adult SHR were divided into five groups. The
control group received vehicle, while the other groups received adriamycin (2
mg/kg, i.v.) twice in a 21-day interval, followed by vehicle, losartan (L,10
mg/kg/day), tempol (T,100 mg/kg/day) or combined T+L treatment (by gavage) during
a six-week period. Adriamycin significantly increased proteinuria, plasma lipid
peroxidation, kidney protein oxidation, nitrite excretion, matrix
metalloproteinase-1 (MMP-1) protein expression and nestin immunostaining in the
kidney. Also, it decreased kidney antioxidant defense, kidney NADPH oxidase 4
(kNox4) protein expression and abolished anti-inflammatory response due to
significant reduction of kidney NADPH oxidase 2 (kNox2) protein expression in
SHR. All treatments reduced protein-to-creatinine ratio (marker of proteinuria),
pTBARS production, kidney protein carbonylation, nitrite excretion, increased
antioxidant capacity and restored kidney nestin expression similar to control.
Both single treatments significantly improved systemic and kidney antioxidant
defense, bioavailability of renal nitric oxide, reduced kMMP-1 protein expression
and renal injury, thus retarded CKD progression. Losartan improved blood
pressure, as well as tubular injury and restored anti-inflammatory defense by
reverting kNox2 expression to the control level. Interestingly, tempol was more
successful in reducing systemic oxidative stress, proteinuria, kMMP-1 and
glomerulosclerosis. However, combined treatment failed to overcome the beneficial
effects of single treatments in slowing down the progression of ADR-induced
nephropathy in SHR.
|*Oxidative Stress
[MESH]
|Animals
[MESH]
|Antihypertensive Agents/administration & dosage/pharmacology/*therapeutic use
[MESH]
|Antioxidants/administration & dosage/pharmacology/*therapeutic use
[MESH]
|Cyclic N-Oxides/administration & dosage/pharmacology/*therapeutic use
[MESH]
|Drug Therapy, Combination
[MESH]
|Female
[MESH]
|Kidney/drug effects/metabolism/pathology
[MESH]
|Losartan/administration & dosage/pharmacology/*therapeutic use
[MESH]