Effect of Vestibulosympathetic Reflex and Baroreflex on Expression of pERK in the Nucleus Tractus Solitarius following Acute Hypotension in Conscious Rats.
10.4196/kjpp.2014.18.4.353
- Author:
Xian JIANG
1
;
Yan LAN
;
Yuan Zhe JIN
;
Joo Young PARK
;
Byung Geon PARK
;
Abdul Nasir AMEER
;
Byung Rim PARK
Author Information
1. Department of Physiology and Pathophysiology, Yanbian University College of Medicine, Yanji 133002, China. y-z-jin@ybu.edu.cn
- Publication Type:Original Article
- Keywords:
Baroreceptor;
Hypotension;
Nucleus tractus solitarius;
pERK;
Vestibular receptor
- MeSH:
Animals;
Baroreflex*;
Blood Pressure;
Denervation;
Hypotension*;
Hypotension, Orthostatic;
Neurons;
Nitroprusside;
Pressoreceptors;
Protein Kinases;
Rats*;
Reflex*;
Solitary Nucleus*
- From:The Korean Journal of Physiology and Pharmacology
2014;18(4):353-358
- CountryRepublic of Korea
- Language:English
-
Abstract:
Control of blood pressure is maintained by the interaction between the arterial baroreflex and vestibulosympathetic reflex during postural changes. In this study, the contributions of vestibular receptors and baroreceptors to the maintenance of blood pressure following acute hypotension were compared in terms of phosphorylated extracellular regulated protein kinase (pERK) expression in the nucleus tractus solitaries (NTS). Expression of pERK in the NTS was measured in conscious rats that had undergone bilateral labyrinthectomy (BL) and/or sinoaortic denervation (SAD) 5, 10, 20, and 40 min following acute hypotension induced by sodium nitroprusside (SNP) infusion. Expression of pERK increased significantly in the NTS in the control group following SNP infusion, and the expression peaked at 10 min after SNP infusion. The number of pERK positive neurons increased following SNP infusion in BL, SAD, and BL+SAD groups, although the increase was smaller than in control group. The BL group showed a relatively higher reduction in pERK expression than the SAD group, and the pERK expression in the NTS was localized to the caudal portion of the nuclei in the BL and SAD groups. These results suggest that the vestibular receptors may play a key role in maintaining blood pressure following acute hypotension; thus, the vestibular system may contribute to compensate for orthostatic hypotension.
