IQUIMEFA   05518
INSTITUTO QUIMICA Y METABOLISMO DEL FARMACO
Unidad Ejecutora - UE
artículos
Título:
Renal actions of atrial natriuretic peptide in spontaneously hypertensive rats: the role of nitric oxide as a key mediator
Autor/es:
ELESGARAY ROSANA; CANIFFI CAROLINA; LUCÍA SAVIGNANO; MARIANA ROMERO; MAC LAUGHLIN MYRIAM; ARRANZ CRISTINA; COSTA MARÍA ÁNGELES
Revista:
AMERICAN JOURNAL OF PHYSIOLOGY-RENAL PHYSIOLOGY
Editorial:
AMER PHYSIOLOGICAL SOC
Referencias:
Año: 2012 p. 1385 - 1394
ISSN:
1931-857X
Resumen:
Atrial natriuretic peptide (ANP) is an important regulator of blood pressure (BP).
One of the mechanisms whereby ANP impacts BP is by stimulation of
nitric oxide (NO) production in different tissues involved in BP control.
We hypothesized that ANP-stimulated NO is impaired in the kidneys of
spontaneously hypertensive rats (SHR) and this contributes to the devel-
opment and/or maintenance of high levels of BP. We investigated the
effects of ANP on the NO system in SHR, studying the changes in renal
nitric oxide synthase (NOS) activity and expression in response to peptide
infusion, the signaling pathways implicated in the signaling cascade that
activates NOS, and identifying the natriuretic peptide receptors (NPR),
guanylyl cyclase receptors (NPR-A and NPR-B) and/or NPR-C, and
NOS isoforms involved. In vivo, SHR and Wistar-Kyoto rats (WKY)
were infused with saline (0.05 ml/min) or ANP (0.2 mg·kg21·min21).
NOS activity and endothelial (eNOS), neuronal (nNOS), and inducible
(iNOS) NOS expression were measured in the renal cortex and medulla.
In vitro, ANP-induced renal NOS activity was determined in the presence
of iNOS and nNOS inhibitors, NPR-A/B blockers, guanine nucleotide-
regulatory (Gi) protein, and calmodulin inhibitors. Renal NOS activity
was higher in SHR than in WKY. ANP increased NOS activity, but
activation was lower in SHR than in WKY. ANP had no effect on
expression of NOS isoforms. ANP-induced NOS activity was not mod-
ified by iNOS and nNOS inhibitors. NPR-A/B blockade blunted NOS
stimulation via ANP in kidney. The renal NOS response to ANP was
reduced by Gi protein and calmodulin inhibitors. We conclude that ANP
interacts with NPR-C, activating Ca-calmodulin eNOS through Gi pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.Atrial natriuretic peptide (ANP) is an important regulator of blood pressure (BP).
One of the mechanisms whereby ANP impacts BP is by stimulation of
nitric oxide (NO) production in different tissues involved in BP control.
We hypothesized that ANP-stimulated NO is impaired in the kidneys of
spontaneously hypertensive rats (SHR) and this contributes to the devel-
opment and/or maintenance of high levels of BP. We investigated the
effects of ANP on the NO system in SHR, studying the changes in renal
nitric oxide synthase (NOS) activity and expression in response to peptide
infusion, the signaling pathways implicated in the signaling cascade that
activates NOS, and identifying the natriuretic peptide receptors (NPR),
guanylyl cyclase receptors (NPR-A and NPR-B) and/or NPR-C, and
NOS isoforms involved. In vivo, SHR and Wistar-Kyoto rats (WKY)
were infused with saline (0.05 ml/min) or ANP (0.2 mg·kg21·min21).
NOS activity and endothelial (eNOS), neuronal (nNOS), and inducible
(iNOS) NOS expression were measured in the renal cortex and medulla.
In vitro, ANP-induced renal NOS activity was determined in the presence
of iNOS and nNOS inhibitors, NPR-A/B blockers, guanine nucleotide-
regulatory (Gi) protein, and calmodulin inhibitors. Renal NOS activity
was higher in SHR than in WKY. ANP increased NOS activity, but
activation was lower in SHR than in WKY. ANP had no effect on
expression of NOS isoforms. ANP-induced NOS activity was not mod-
ified by iNOS and nNOS inhibitors. NPR-A/B blockade blunted NOS
stimulation via ANP in kidney. The renal NOS response to ANP was
reduced by Gi protein and calmodulin inhibitors. We conclude that ANP
interacts with NPR-C, activating Ca-calmodulin eNOS through Gi pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.mg·kg21·min21).
NOS activity and endothelial (eNOS), neuronal (nNOS), and inducible
(iNOS) NOS expression were measured in the renal cortex and medulla.
In vitro, ANP-induced renal NOS activity was determined in the presence
of iNOS and nNOS inhibitors, NPR-A/B blockers, guanine nucleotide-
regulatory (Gi) protein, and calmodulin inhibitors. Renal NOS activity
was higher in SHR than in WKY. ANP increased NOS activity, but
activation was lower in SHR than in WKY. ANP had no effect on
expression of NOS isoforms. ANP-induced NOS activity was not mod-
ified by iNOS and nNOS inhibitors. NPR-A/B blockade blunted NOS
stimulation via ANP in kidney. The renal NOS response to ANP was
reduced by Gi protein and calmodulin inhibitors. We conclude that ANP
interacts with NPR-C, activating Ca-calmodulin eNOS through Gi pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.i) protein, and calmodulin inhibitors. Renal NOS activity
was higher in SHR than in WKY. ANP increased NOS activity, but
activation was lower in SHR than in WKY. ANP had no effect on
expression of NOS isoforms. ANP-induced NOS activity was not mod-
ified by iNOS and nNOS inhibitors. NPR-A/B blockade blunted NOS
stimulation via ANP in kidney. The renal NOS response to ANP was
reduced by Gi protein and calmodulin inhibitors. We conclude that ANP
interacts with NPR-C, activating Ca-calmodulin eNOS through Gi pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.i protein and calmodulin inhibitors. We conclude that ANP
interacts with NPR-C, activating Ca-calmodulin eNOS through Gi pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.i pro-
tein. NOS activation also involves NPR-A/B. The NOS response to ANP
was diminished in kidneys of SHR. The impaired NO system response to
ANP in SHR participates in the maintenance of high blood pressure.