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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 Auton+Neurosci
2017 ; 204
(ä): 57-64
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Integration of renal sensory afferents at the level of the paraventricular
nucleus dictating sympathetic outflow
#MMPMID27527558
Zheng H
; Patel KP
Auton Neurosci
2017[May]; 204
(ä): 57-64
PMID27527558
show ga
The sympathetic nervous system has been identified as a major contributor to the
pathophysiology of chronic heart failure (CHF) and other diseases such as
hypertension and diabetes, both in experimental animal models and patients. The
kidneys have a dense afferent sensory innervation positioning it to be the origin
of multimodal input to the central nervous system. Afferent renal nerve (ARN)
signals are centrally integrated, and their activation results in a general
increase in sympathetic tone, which is directed toward the kidneys as well as
other peripheral organs innervated by the sympathetic nerves. In the central
nervous system, stimulation of ARN increases the neuronal discharge frequency and
neuronal activity in the paraventricular nucleus (PVN) of the hypothalamus. The
activity of the neurons in the PVN is attenuated during iontophoretic application
of glutamate receptor blocker, AP5. An enhanced afferent renal input to the PVN
may be critically involved in dictating sympathoexcitation in CHF. Furthermore,
renal denervation abrogates the enhanced neuronal activity within the PVN in rats
with CHF, thereby possibly contributing to the reduction in sympathetic tone.
Renal denervation also restores the decreased endogenous levels of neuronal
nitric oxide synthase (nNOS) in the PVN of rats with CHF. Overall, these data
demonstrate that sensory information originating in the kidney excites
pre-autonomic sympathetic neurons within the PVN and this "renal-PVN afferent
pathway" may contribute to elevated sympathetic nerve activity in
hyper-sympathetic disease conditions such as CHF and hypertension.