title: Chronic psychosocial stress-induced down-regulation of immunity depends upon individual factors.
abstract: The effect of chronic stress on immune functions is strongly biased by individual factors. Mice were subjected to a new model of chronic psychosocial stress in which four different subcategories of stressed animals may be identified: Resident Dominants (RD), Resident Subordinates (RS), Intruder Dominants (InD), and Intruder Subordinates (InS). After 7 days of stress, mice were immunized with keyhole limpet hemocyanine (KLH). Their immune functions were investigated 14 days later with stress continuing trough. Importantly, RS mice, which are mice losing territory ownership, were the more affected, having lower IgG, proliferation, and IL-2. RD and InD showed lower IgG while InS showed no immune alteration. In conclusion, loss of resources could be a key factor in determining individual vulnerability to stressful events.
authors.affiliation: Dipartimento di Biologia Evolutiva e Funzionale, Università di Parma, 43100 Parma, Italy. bartolomucci@biol.unipr.it
authors.forename: Alessandro
authors.initials: A
authors.lastname: Bartolomucci
authors.forename: Paola
authors.initials: P
authors.lastname: Sacerdote
authors.forename: Alberto E
authors.initials: AE
authors.lastname: Panerai
authors.forename: Tiziana
authors.initials: T
authors.lastname: Pederzani
authors.forename: Paola
authors.initials: P
authors.lastname: Palanza
authors.forename: Stefano
authors.initials: S
authors.lastname: Parmigiani
authors.forename: Tiziana
authors.initials: T
authors.lastname: Peterzani
mesh_terms: D000378:Agonistic Behavior / Q000502:physiology; D000704:Analysis of Variance; D000818:Animals; D021461:Animals, Outbred Strains; D001835:Body Weight / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D002908:Chronic Disease; D016207:Cytokines / Q000032:analysis; D015536:Down-Regulation / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D006433:Hemocyanins / Q000008:administration & dosage / Q000276:immunology; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000097:blood; D007075:Immunoglobulin M / Q000096:biosynthesis / Q000097:blood; D007274:Injections, Intraperitoneal; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008959:Models, Neurological; D012919:Social Behavior; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013315:Stress, Psychological / Q000276:immunology* / Q000503:physiopathology / Q000523:psychology*
chemical_list: D016207:Cytokines; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D006433:Hemocyanins; C032808:keyhole-limpet hemocyanin