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2017 ; 205
(ä): 77-86
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Central TrkB blockade attenuates ICV angiotensin II-hypertension and sympathetic
nerve activity in male Sprague-Dawley rats
#MMPMID28549782
Becker BK
; Wang H
; Zucker IH
Auton Neurosci
2017[Jul]; 205
(ä): 77-86
PMID28549782
show ga
Increased sympathetic nerve activity and the activation of the central
renin-angiotensin system are commonly associated with cardiovascular disease
states such as hypertension and heart failure, yet the precise mechanisms
contributing to the long-term maintenance of this sympatho-excitation are
incompletely understood. Due to the established physiological role of
neurotrophins contributing toward neuroplasticity and neuronal excitability along
with recent evidence linking the renin-angiotensin system and brain-derived
neurotrophic factor (BDNF) along with its receptor (TrkB), it is likely the two
systems interact to promote sympatho-excitation during cardiovascular disease.
However, this interaction has not yet been fully demonstrated, in vivo. Thus, we
hypothesized that central angiotensin II (Ang II) treatment will evoke a
sympatho-excitatory state mediated through the actions of BDNF/TrkB. We infused
Ang II (20ng/min) into the right lateral ventricle of male Sprague-Dawley rats
for twelve days with or without the TrkB receptor antagonist, ANA-12 (50ng/h). We
found that ICV infusion of Ang II increased mean arterial pressure (+40.4mmHg),
increased renal sympathetic nerve activity (+19.4% max activity), and induced
baroreflex dysfunction relative to vehicle. Co-infusion of ANA-12 attenuated the
increase in blood pressure (-20.6mmHg) and prevented the increase in renal
sympathetic nerve activity (-22.2% max) and baroreflex dysfunction relative to
Ang II alone. Ang II increased thirst and decreased food consumption, and Ang
II+ANA-12 augmented the thirst response while attenuating the decrease in food
consumption. We conclude that TrkB signaling is a mediator of the long-term blood
pressure and sympathetic nerve activity responses to central Ang II activity.
These findings demonstrate the involvement of neurotrophins such as BDNF in
promoting Ang II-induced autonomic dysfunction and further implicate TrkB
signaling in modulating presympathetic autonomic neurons during cardiovascular
disease.