Linked Life Data

10884340

Source:http://linkedlifedata.com/resource/pubmed/id/10884340

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
2000-8-3
pubmed:abstractText
Chronic stress alters hypothalamic-pituitary-adrenal (HPA) responses to acute, novel stress. After acute restraint, the posterior division of the paraventricular thalamic nucleus (pPVTh) exhibits increased numbers of Fos-expressing neurons in chronically cold-stressed rats compared with stress-naive controls. Furthermore, lesions of the PVTh augment HPA activity in response to novel restraint only in previously stressed rats, suggesting that the PVTh is inhibitory to HPA activity but that inhibition occurs only in chronically stressed rats. In this study, we further examined pPVTh functions in chronically stressed rats. We identified afferent projections to the pPVTh using injection of the retrograde tracer fluorogold. Of the sites containing fluorogold-labeled cells, neurons in the lateral parabrachial, periaqueductal gray, and dorsal raphe containing fluorogold also expressed cholecystokinin (CCK) mRNA. We then examined whether these CCKergic inputs to the pPVTh were involved in HPA responses to acute, novel restraint after chronic stress. We injected the CCK-B receptor antagonist PD 135,158 into the PVTh before restraint in control and chronically cold-stressed rats. ACTH responses to restraint stress were augmented by PD 135,158 only in chronically stressed rats but not in controls. In addition, CCK-B receptor mRNA expression in the pPVTh was not altered by chronic cold stress. We conclude that previous chronic stress specifically facilitates the release of CCK into the pPVTh in response to acute, novel stress. The CCK is probably secreted from neurons in the lateral parabrachial, the periaqueductal gray, and/or the dorsal raphe nuclei. Acting via CCK-B receptors in pPVTh, CCK then constrains facilitated ACTH responses to novel stress in chronically stressed but not naive rats. These results demonstrate clearly that chronic stress recruits a new set of pathways that modulate HPA responsiveness to a novel stress.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0270-6474
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5564-73
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:10884340-Adrenocorticotropic Hormone, pubmed-meshheading:10884340-Afferent Pathways, pubmed-meshheading:10884340-Animals, pubmed-meshheading:10884340-Axonal Transport, pubmed-meshheading:10884340-Brain Stem, pubmed-meshheading:10884340-Cholecystokinin, pubmed-meshheading:10884340-Fluorescent Dyes, pubmed-meshheading:10884340-Hypothalamo-Hypophyseal System, pubmed-meshheading:10884340-Hypothalamus, pubmed-meshheading:10884340-Limbic System, pubmed-meshheading:10884340-Male, pubmed-meshheading:10884340-Midline Thalamic Nuclei, pubmed-meshheading:10884340-Neural Pathways, pubmed-meshheading:10884340-Pituitary-Adrenal System, pubmed-meshheading:10884340-RNA, Messenger, pubmed-meshheading:10884340-Rats, pubmed-meshheading:10884340-Rats, Sprague-Dawley, pubmed-meshheading:10884340-Receptor, Cholecystokinin B, pubmed-meshheading:10884340-Receptors, Cholecystokinin, pubmed-meshheading:10884340-Stilbamidines, pubmed-meshheading:10884340-Stress, Physiological, pubmed-meshheading:10884340-Time
pubmed:year
2000
pubmed:articleTitle
A cholecystokinin-mediated pathway to the paraventricular thalamus is recruited in chronically stressed rats and regulates hypothalamic-pituitary-adrenal function.
pubmed:affiliation
Department of Physiology, University of California at San Francisco, San Francisco, California 94143-0444, USA. bhatnags@umich.edu
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't