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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Life+Sci
2015 ; 124
(ä): 81-90
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Role of Angiotensin II type 1 receptor on renal NAD(P)H oxidase, oxidative stress
and inflammation in nitric oxide inhibition induced-hypertension
#MMPMID25623850
Rincón J
; Correia D
; Arcaya JL
; Finol E
; Fernández A
; Pérez M
; Yaguas K
; Talavera E
; Chávez M
; Summer R
; Romero F
Life Sci
2015[Mar]; 124
(ä): 81-90
PMID25623850
show ga
AIMS: Activation of the renin-angiotensin system (RAS), renal oxidative stress
and inflammation are constantly present in experimental hypertension. Nitric
oxide (NO) inhibition with N(w)-nitro-L-arginine methyl ester (L-NAME) has
previously been reported to produce hypertension, increased expression of
Angiotensin II (Ang II) and renal dysfunction. The use of Losartan, an Ang II
type 1 receptor (AT1R) antagonist has proven to be effective reducing
hypertension and renal damage; however, the mechanism by which AT1R blockade
reduced kidney injury and normalizes blood pressure in this experimental model is
still complete unknown. The current study was designed to test the hypothesis
that AT1R activation promotes renal NAD(P)H oxidase up-regulation, oxidative
stress and cytokine production during L-NAME induced-hypertension. MAIN METHODS:
Male Sprague-Dawley rats were distributed in three groups: L-NAME, receiving 70
mg/100ml of L-NAME, L-NAME+Los, receiving 70 mg/100ml of L-NAME and 40 mg/kg/day
of Losartan; and Controls, receiving water instead of L-NAME or L-NAME and
Losartan. KEY FINDINGS: After two weeks, L-NAME induced high blood pressure,
renal overexpression of AT1R, NAD(P)H oxidase sub-units gp91, p22 and p47,
increased levels of oxidative stress, interleukin-6 (IL-6) and interleukin-17
(IL-17). Also, we found increased renal accumulation of lymphocytes and
macrophages. Losartan treatment abolished the renal expression of gp91, p22, p47,
oxidative stress and reduced NF-?B activation and IL-6 expression. SIGNIFICANCE:
These findings indicate that NO induced-hypertension is associated with
up-regulation of NADPH oxidase, oxidative stress production and overexpression of
key inflammatory mediators. These events are associated with up-regulation of
AT1R, as evidenced by their reversal with AT1R blocker treatment.
|Angiotensin II Type 1 Receptor Blockers/pharmacology
[MESH]