Acute stressor-selective effect on total plasma homocysteine concentration in rats

Acute stressor-selective effect on total plasma homocysteine concentration in rats

Author Oliveira, A. C. de Google Scholar
Suchecki, D. Google Scholar
Cohen, S. Google Scholar
D'Almeida, V Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract Stress produces several physiological and behavioral alterations that increase cardiovascular morbidity and mortality. Nonetheless, there is a dearth of studies that have evaluated the effects of stress on total plasma homocysteine, an important amino acid associated with cardiovascular disease. We used four distinct acute stressors in rats, i.e., swimming, restrain, novelty and cold exposure, in order to examine whether any acute effect on total plasma homocysteine concentrations would occur. Plasma corticosterone and adrenocorticotropic hormone concentrations were also measured to demonstrate the ability of the chosen manipulations to activate the hypothalamic-pituitary-adrenal (HPA) axis. Three of the four stressors activated the HPA axis and only restrain affected total plasma homocysteine concentrations ( +37%, P=.006) compared with the control group. the complexity of the physiological responses to stress, the peculiarities of stress responses and the intricate regulatory systems involved in homocysteine metabolism must be taken into account in order to clarify the increasing effect of restrain (mainly a psychological stressor) on total plasma homocysteine concentrations in rats and to evaluate its meaning in human pathology. (C) 2003 Elsevier Inc. All rights reserved.
Keywords homocysteine metabolism
acute stress
psychological stress
rats
Language English
Date 2004-02-01
Published in Pharmacology Biochemistry and Behavior. Oxford: Pergamon-Elsevier B.V., v. 77, n. 2, p. 269-273, 2004.
ISSN 0091-3057 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 269-273
Origin http://dx.doi.org/10.1016/j.pbb.2003.11.003
Access rights Closed access
Type Article
Web of Science ID WOS:000188733200010
URI http://repositorio.unifesp.br/handle/11600/27611

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