title: Effect of Vestibulosympathetic Reflex and Baroreflex on Expression of pERK in the Nucleus Tractus Solitarius following Acute Hypotension in Conscious Rats.
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.
authors.affiliation: Department of Physiology and Pathophysiology, Yanbian University College of Medicine, Yanji 133002, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Department of Physiology and Pathophysiology, Yanbian University College of Medicine, Yanji 133002, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Lan
authors.affiliation: Department of Physiology and Pathophysiology, Yanbian University College of Medicine, Yanji 133002, China.
authors.forename: Yuan-Zhe
authors.initials: YZ
authors.lastname: Jin
authors.affiliation: Department of Oral Physiology, Wonkwang University College of Dentistry, Iksan 570-749, Korea.
authors.forename: Joo Young
authors.initials: JY
authors.lastname: Park
authors.affiliation: Department of Food and Nutrition, Kwangju Women's University, Gwangju 506-713, Korea.
authors.forename: Byung Geon
authors.initials: BG
authors.lastname: Park
authors.affiliation: Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University, Iksan 570-749, Korea.
authors.forename: Abdul Nasir
authors.initials: AN
authors.lastname: Ameer
authors.affiliation: Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University, Iksan 570-749, Korea.
authors.forename: Byung Rim
authors.initials: BR
authors.lastname: Park
keywords: Baroreceptor; Hypotension; Nucleus tractus solitarius; Vestibular receptor; pERK