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2016 ; 68
(1
): 175-84
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Renal Denervation Improves Exaggerated Sympathoexcitation in Rats With Heart
Failure: A Role for Neuronal Nitric Oxide Synthase in the Paraventricular
Nucleus
#MMPMID27185748
Patel KP
; Xu B
; Liu X
; Sharma NM
; Zheng H
Hypertension
2016[Jul]; 68
(1
): 175-84
PMID27185748
show ga
Renal denervation (RDN) has been postulated to reduce sympathetic drive during
heart failure (HF), but the central mechanisms are not completely understood. The
purpose of the present study was to assess the contribution of neuronal nitric
oxide synthase (nNOS) within the paraventricular nucleus (PVN) in modulating
sympathetic outflow in rats with HF that underwent RDN. HF was induced in rats by
ligation of the left coronary artery. Four weeks after surgery, bilateral RDN was
performed. Rats with HF had an increase in FosB-positive cells in the PVN with a
concomitant increase in urinary excretion of norepinephrine, and both of these
parameters were ameliorated after RDN. nNOS-positive cells immunostaining,
diaphorase staining, and nNOS protein expression were significantly decreased in
the PVN of HF rats, findings that were ameliorated by RDN. Microinjection of nNOS
inhibitor N(G)-monomethyl l-arginine into the PVN resulted in a blunted increase
in lumbar sympathetic nerve activity (11±2% versus 24±2%) in HF than in sham
group. This response was normalized after RDN. Stimulation of afferent renal
nerves produced a greater activation of PVN neurons in rats with HF. Afferent
renal nerve stimulation elicited a greater increase in lumbar sympathetic nerve
activity in rats with HF than in sham rats (45±5% versus 22±2%). These results
suggest that intact renal nerves contribute to the reduction of nNOS in the PVN,
resulting in the activation of the neurons in the PVN of rats with HF. RDN
restores nNOS and thus attenuates the sympathoexcitation commonly observed in HF.