NAD(P)H oxidase in paraventricular nucleus contributes to the effect of angiotensin II on cardiac sympathetic afferent reflex.

Abstract:

:We previously reported that reactive oxygen species (ROS) in paraventricular nucleus (PVN) modulated cardiac sympathetic afferent reflex (CSAR) and mediated the effect of angiotensin II (Ang II) in the PVN on the CSAR. In the present study, we investigated whether the NAD(P)H oxidase in the PVN was a key source of ROS which modulated the CSAR and contributed to the effect of Ang II on the CSAR. In anesthetized rats with sinoaortic denervation and vagotomy, renal sympathetic nerve activity (RSNA) and arterial pressure were recorded. The CSAR was evaluated by the RSNA response to epicardial application of bradykinin (BK). The NAD(P)H oxidase activity in the PVN was measured with lucigenin-enhanced chemiluminescent method. Microinjection of the NAD(P)H oxidase inhibitor, either apocynin (1.0 nmol) or phenylarsine oxide (PAO, 1.0 nmol), into the PVN significantly inhibited the CSAR. Microinjection of Ang II (0.3 nmol) into the PVN significantly augmented the CSAR. The effects of Ang II were not only abolished by pretreatment with either apocynin or PAO in the PVN but also partially inhibited by xanthine oxidase inhibitor allopurinol. Either epicardial application of BK or microinjection of Ang II into the PVN significantly increased NAD(P)H oxidase activity in the PVN. The effect of Ang II on NAD(P)H oxidase activity was abolished by pretreatment with AT(1) receptor antagonist losartan in the PVN. These findings suggested that NAD(P)H oxidase in the PVN was a major source of the ROS in modulating the CSAR, and the NAD(P)H oxidase contributes to the effect of Ang II on the CSAR.

journal_name

Brain Res

journal_title

Brain research

authors

Zhang Y,Yu Y,Zhang F,Zhong MK,Shi Z,Gao XY,Wang W,Zhu GQ

doi

10.1016/j.brainres.2006.01.113

subject

Has Abstract

pub_date

2006-04-12 00:00:00

pages

132-41

issue

1

eissn

0006-8993

issn

1872-6240

pii

S0006-8993(06)00312-X

journal_volume

1082

pub_type

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