Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/196246
Type: Artigo de periódico
Title: Expression And Localization Of Nk(1)r, Substance P And Cgrp Are Altered In Dorsal Root Ganglia Neurons Of Spontaneously Hypertensive Rats (shr).
Author: Aline Boer, Patrícia
Ueno, Mirian
Sant'ana, Jenifer S M
Saad, Mário J A
Gontijo, José Antonio Rocha
Abstract: The kidneys play a pivotal role in the pathogenesis of essential hypertension because of a primary defect in renal hemodynamics and/or tubule hydro-saline handling that results in the retention of fluid and electrolytes. Previous studies have shown that increasing the renal pelvic pressure increased ipsilateral afferent renal nerve activity (ARNA), the ipsilateral renal pelvic release of substance P (SP) and the contralateral urinary sodium excretion in Wistar--Kyoto rats (WKy). However, spontaneously hypertensive rats (SHR) present an impaired renorenal reflex activity associated, partly, with a peripheral defect at the level of the sensory receptors in the renal pelvis. Furthermore, the renal pelvic administration of SP failed to increase ARNA in most of SHR at concentrations that produced marked increases in WKy. Since we have assessed the expression and localization of NK(1) receptor (NK(1)R), SP and calcitonin gene-related peptide (CGRP) in different dorsal root ganglia (DRG) cell subtypes and renal pelvis of 7- and 14-week-old SHR. The results of this study show increased SP and CGRP expression in the dorsal ganglia root cells of SHR compared to WKy rats. Additionally, there was a progressive, significant, age-dependent, decrease in NK(1)R expression on the membrane surface in SHR DRG cells and in the renal pelvis. In conclusion, the results of the present study suggest that the impaired activation of renal sensory neurons in SHR may be related to changes in the expression of neuropeptides and/or to a decreased presence of NK(1)R in DRG cells. Such abnormalities could contribute to the enhanced sodium retention and elevation of blood pressure seen in SHR.
Subject: Age Factors
Analysis Of Variance
Animals
Blotting, Western
Calcitonin Gene-related Peptide
Ganglia, Spinal
Gene Expression Regulation
Immunohistochemistry
Male
Microscopy, Immunoelectron
Neurons
Rats
Rats, Inbred Shr
Rats, Inbred Wky
Receptors, Neurokinin-1
Subcellular Fractions
Substance P
Rights: fechado
Identifier DOI: 10.1016/j.molbrainres.2005.03.015
Address: http://www.ncbi.nlm.nih.gov/pubmed/15869822
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File SizeFormat 
pmed_15869822.pdf563.72 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.