title: Brain glucocorticoid receptor and heat shock protein 70 levels in rats exposed to acute, chronic or combined stress.
abstract: The pattern and intensity of glucocorticoid receptor (GR) and heat shock 70 protein (Hsp 70) changes in the hippocampus and brain cortex of adult Wistar rat males exposed to acute (immobilization, cold) and chronic (social isolation, crowding, daily swimming) stress or their combinations were followed by Western immunoblotting. Plasma ACTH and CORT were measured by chemiluminescent method and RIA. A significant decrease in cytosol GR and Hsp 70 was observed after acute stress, while chronic stresses led to negligible changes in both these proteins and caused a reduced responsiveness to a novel acute stress. This was valid irrespective of the type of chronic or acute stress combinations for both hippocampal and cortical GR and Hsp 70. The results support the hypothesis that chronic stress-induced deregulation of the LHPA axis may be caused, at least in part, by partial disruption of intracelullar negative feedback control in the higher centers of the brain.
authors.affiliation: Laboratory of Molecular Biology and Endocrinology, VINCA Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro.
authors.forename: Dragana
authors.initials: D
authors.lastname: Filipović
authors.forename: Ljubica
authors.initials: L
authors.lastname: Gavrilović
authors.forename: Sladjana
authors.initials: S
authors.lastname: Dronjak
authors.forename: Marija B
authors.initials: MB
authors.lastname: Radojcić
mesh_terms: D000208:Acute Disease; D000818:Animals; D001921:Brain / Q000166:cytology; D001923:Brain Chemistry / Q000502:physiology*; D002467:Cell Nucleus / Q000378:metabolism; D002908:Chronic Disease; D003441:Crowding / Q000503:physiopathology / Q000523:psychology; D003593:Cytoplasm / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004912:Erythrocytes / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D015151:Immunoblotting; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D011965:Receptors, Glucocorticoid / Q000378:metabolism*; D012934:Social Isolation / Q000523:psychology; D013315:Stress, Psychological / Q000378:metabolism*; D013550:Swimming / Q000502:physiology / Q000523:psychology
chemical_list: D018840:HSP70 Heat-Shock Proteins; D011965:Receptors, Glucocorticoid