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Cardiovascular Toxicology
Published in: Cardiovascular Toxicology 3/2016

01-07-2016

Salusin β Within the Nucleus Tractus Solitarii Suppresses Blood Pressure Via Inhibiting the Activities of Presympathetic Neurons in the Rostral Ventrolateral Medulla in Spontaneously Hypertensive Rats

Authors: Hong-Bao Li, Yan Lu, Jin-Jun Liu, Yu-Wang Miao, Tian-Zhen Zheng, Qing Su, Jie Qi, Hong Tan, Zu-Yi Yuan, Guo-Qing Zhu, Yu-Ming Kang

Published in: Cardiovascular Toxicology | Issue 3/2016

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Abstract

Salusin β is a newly identified bioactive peptide, which shows peripheral hypotensive, mitogenic and proatherosclerotic effects. The present study was undertaken to investigate the role of salusin β within the nucleus tractus solitarii (NTS) and the underlying mechanism in regulating blood pressure and heart rate (HR) in spontaneously hypertensive rats (SHR). Our results showed that bilateral or unilateral microinjection of salusin β (0.4–40 pmol) into the NTS in SHR decreased mean arterial pressure and HR in a dose-dependent manner. Bilateral microinjection of salusin β (4 pmol) within NTS improved baroreflex sensitivity functions in SHR. Pretreatment with glutamate receptors antagonist kynurenic acid (5 nmol) into the NTS in SHR did not alter the salusin β (4 pmol) induced hypotension and bradycardia. Likewise, bilateral vagotomy also did not alter the salusin β (4 pmol) induced hypotension and bradycardia. However, pretreatment with GABAA receptors agonist muscimol (100 pmol) within the rostral ventrolateral medulla (RVLM) in SHR almost completely abolished the hypotension and bradycardia evoked by intra-NTS salusin β (4 pmol). Our findings suggested that microinjection of salusin β into the NTS produced hypotension and bradycardia, as well as improved baroreflex sensitivity functions, via inhibiting the activities of presympathetic neurons in the RVLM in SHR.
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Metadata
Title
Salusin β Within the Nucleus Tractus Solitarii Suppresses Blood Pressure Via Inhibiting the Activities of Presympathetic Neurons in the Rostral Ventrolateral Medulla in Spontaneously Hypertensive Rats
Authors
Hong-Bao Li
Yan Lu
Jin-Jun Liu
Yu-Wang Miao
Tian-Zhen Zheng
Qing Su
Jie Qi
Hong Tan
Zu-Yi Yuan
Guo-Qing Zhu
Yu-Ming Kang
Publication date
01-07-2016
Publisher
Springer US
Published in
Cardiovascular Toxicology / Issue 3/2016
Print ISSN: 1530-7905
Electronic ISSN: 1559-0259
DOI
https://doi.org/10.1007/s12012-015-9330-2

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