PMID: 9646938Jul 1, 1998Paper

Chronic varied stress modulates experimental autoimmune encephalomyelitis in Wistar rats

Brain, Behavior, and Immunity
S G CorreaC M Riera

Abstract

Stress disturbs homeostasis by altering the equilibrium of various hormones which have a significant impact on immune responses. Few studies have examined the influence of stressors on autoimmune disease in animal models. In our work, we studied the effects of long-term exposure (14 days) to chronic varied stress (CVS) in a model of experimental autoimmune encephalomyelitis (EAE) in Wistar rats. We studied whether the exposure to CVS before or after the immune challenge would correlate with differences in the clinical course of the disease. We also examined whether the CVS would modulate the magnitude of the cellular or the humoral immune response. We observed opposite effects on the clinical signs in animals stressed before or after the immune challenge. The clinical signs of the disease were attenuated in animals stressed before but not after the immune challenge. Relationships were found in the modulation of the clinical severity related to the time of exposure to the CVS, the histological alterations and the proliferative results. Stressed animals with milder clinical signs presented an exacerbated humoral response against myelin antigens while stressed animals with more severe clinical symptoms exhibited a significantly di...Continue Reading

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