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http://dx.doi.org/10.4196/kjpp.2015.19.5.427

Functional Connections of the Vestibulo-spino-adrenal Axis in the Control of Blood Pressure Via the Vestibulosympathetic Reflex in Conscious Rats  

Lu, Huan-Jun (Department of Physiology and Pathophysiology, Yanbian University College of Medicine and Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules at Yanbian University)
Li, Mei-Han (Department of Physiology and Pathophysiology, Yanbian University College of Medicine and Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules at Yanbian University)
Li, Mei-Zhi (Department of Physiology and Pathophysiology, Yanbian University College of Medicine and Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules at Yanbian University)
Park, Sang Eon (Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University)
Kim, Min Sun (Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University)
Jin, Yuan-Zhe (Department of Physiology and Pathophysiology, Yanbian University College of Medicine and Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules at Yanbian University)
Park, Byung Rim (Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.19, no.5, 2015 , pp. 427-434 More about this Journal
Abstract
Significant evidence supports the role of the vestibular system in the regulation of blood pressure during postural movements. In the present study, the role of the vestibulo-spino-adrenal (VSA) axis in the modulation of blood pressure via the vestibulosympathetic reflex was clarified by immunohistochemical and enzyme immunoassay methods in conscious rats with sinoaortic denervation. Expression of c-Fos protein in the intermediolateral cell column of the middle thoracic spinal regions and blood epinephrine levels were investigated, following microinjection of glutamate receptor agonists or antagonists into the medial vestibular nucleus (MVN) and/or sodium nitroprusside (SNP)-induced hypotension. Both microinjection of glutamate receptor agonists (NMDA and AMPA) into the MVN or rostral ventrolateral medullary nucleus (RVLM) and SNP-induced hypotension led to increased number of c-Fos positive neurons in the intermediolateral cell column of the middle thoracic spinal regions and increased blood epinephrine levels. Pretreatment with microinjection of glutamate receptor antagonists (MK-801 and CNQX) into the MVN or RVLM prevented the increased number of c-Fos positive neurons resulting from SNP-induced hypotension, and reversed the increased blood epinephrine levels. These results indicate that the VSA axis may be a key component of the pathway used by the vestibulosympathetic reflex to maintain blood pressure during postural movements.
Keywords
c-Fos protein; Epinephrine; Glutamate; Intermediolateral cell column; Vestibulo-spino-adrenal axis; Vestibulosympathetic reflex;
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Times Cited By KSCI : 3  (Citation Analysis)
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