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pubmed-article:10625069pubmed:abstractTextThis study had three objectives: (i) to determine whether there were individual differences in the activation and adaptation of a range of immediate-early genes to repeated restraint stress, (ii) to monitor physiological responses (endocrine, cardiovascular and core temperature) and their adaptation with repeated presentations of the stressor, and (iii) to determine whether any of these indices were altered by dehydroepiandrosterone, an anti-glucocorticoid steroid known to be reduced in humans by stress. Four groups of male rats were implanted subcutaneously with either dehydroepiandrosterone or control (paraffin) pellets. They were then subjected to either a single or 14 days of restraint (60 min/day) or transferred to the testing room (unstressed). Repeatedly stressed animals and their controls were also implanted with intra-abdominal telemetric transmitters to record heart rate and core temperature. Protein products for c-fos,fos-b, c-jun and jun-b were displayed by immunocytochemistry. Areas examined included the ventrolateral septum, hypothalamic paraventricular nucleus, amygdala, locus coeruleus and nucleus of the solitary tract. Acute restraint increased Fos immunoreactivity in all of the areas examined, with the exception of the medial amygdala. The pattern of induction for Fos-B and Jun-B was similar, while c-Jun was only increased in the septum (though constitutive levels were high in most structures compared to the other proteins examined). After 14 days of restraint, immediate-early gene immunostaining was reduced in all of the areas examined, though the extent of adaptation depended on the area and immediate-early gene. In the forebrain, Fos expression adapted in the paraventricular nucleus, amygdala and septum, whereas Fos-B and c-Jun adapted incompletely in the septum. In contrast, Jun-B behaved like Fos. In the brainstem, Fos, Fos-B and Jun-B expression adapted in the nucleus of the solitary tract (but not the locus coeruleus). Corticosterone levels were still raised above baseline, but the response was blunted compared to acute stress. There was marked stress-induced hypothermia which did not adapt during the restraint session, but this returned to baseline during restraint after about five days. In contrast, stress-induced tachycardia did not change during repeated restraint. Dehydroepiandrosterone implants had no clear-cut effects on any immunostaining following acute stress, though there was a trend towards lessened adaptation of the Fos response in the septum after steroid treatment. Dehydroepiandrosterone also did not affect the cardiovascular or endocrine responses to repeated restraint. These experiments show that adaptation of the expression of multiple immediate-early genes occurs during repeated restraint, but in a site-specific pattern in the brains of male rats.lld:pubmed
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pubmed-article:10625069pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:10625069pubmed:articleTitleMultiple immediate-early gene expression during physiological and endocrine adaptation to repeated stress.lld:pubmed
pubmed-article:10625069pubmed:affiliationDepartment of Anatomy and MRC Cambridge Centre for Brain Repair, University of Cambridge, UK.lld:pubmed
pubmed-article:10625069pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10625069pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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