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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

INVOLVEMENT OF DORSAL HIPPOCAMPUS GLUTAMATERGIC AND NITRERGIC NEUROTRANSMISSION IN AUTONOMIC RESPONSES EVOKED BY ACUTE RESTRAINT STRESS IN RATS

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Author(s):
Moraes-Neto, T. B. [1, 2] ; Scopinho, A. A. [1] ; Biojone, C. [1, 2] ; Correa, F. M. A. [1] ; Resstel, L. B. M. [1, 2]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Dept Pharmacol, Sch Med Ribeirao Preto, BR-14049900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Ctr Interdisciplinary Res Appl Neurosci NAPNA, BR-14049900 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Neuroscience; v. 258, p. 364-373, JAN 31 2014.
Web of Science Citations: 16
Abstract

The dorsal hippocampus (DH) is a structure of the limbic system that is involved in emotional, learning and memory processes. There is evidence indicating that the DH modulates cardiovascular correlates of behavioral responses to stressful stimuli. Acute restraint stress (RS) is an unavoidable stress situation that evokes marked and sustained autonomic changes, which are characterized by elevated blood pressure (BP), intense heart rate (HR) increase and a decrease in cutaneous temperature. In the present study, we investigated the involvement of an N-methyl-D-aspartate (NMDA) glutamate receptor/nitric oxide (NO) pathway of the DH in the modulation of autonomic (arterial BP, HR and tail skin temperature) responses evoked by RS in rats. Bilateral microinjection of the NMDA receptor antagonist AP-7 (10 nmol/500 nL) into the DH attenuated RS-evoked autonomic responses. Moreover, RS evoked an increase in the content of NO2/NO3 in the DH, which are products of the spontaneous oxidation of NO under physiological conditions that can provide an indirect measurement of NO production. Bilateral microinjection of N-propyl-L-arginine (0.1 nmol/500 nL; N-propyl, a neuronal NO synthase (nNOS) inhibitor) or carboxy-PTIO (2 nmol/500 nL; c-PTIO, an NO scavenger) into the DH also attenuated autonomic responses evoked by RS. Therefore, our findings suggest that a glutamatergic system present in the DH is involved in the autonomic modulation during RS, acting via NMDA receptors and nNOS activation. Furthermore, the present results suggest that NMDA receptor/nNO activation has a facilitatory influence on RS-evoked autonomic responses. (C) 2013 IBRO. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/07332-3 - Possible role of dorsal hippocampus on behaviour and autonomic responses during defensive responses: involvement of NMDA receptor/nitric oxide and endocanabinoid
Grantee:Leonardo Resstel Barbosa Moraes
Support type: Regular Research Grants
FAPESP's process: 12/00390-0 - Study of envolviment of endocanabinoid system in the medial pre-frontal cortex of rats on the modulation of autonomic responses during restraint stress: possibile interection with glutamatergic and nitrergic systems
Grantee:Teophanes Barbosa Moraes Neto
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/17626-7 - Cellular and molecular mechanisms involved in the role of atypical neurotransmitters in neuropsychiatric disorders
Grantee:Francisco Silveira Guimaraes
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/09300-4 - Bed nucleus of the stria terminalis noradrenergic system modulates contextual fear conditionig: possible interaction with CRF and glutamatergic and nitrergic neurotransmission
Grantee:Leonardo Resstel Barbosa Moraes
Support type: Regular Research Grants