Correlates of cognitive dysfunction in multiple sclerosis

Brain, Behavior, and Immunity
C HeesenS M Gold

Abstract

Cognitive impairment is one of the most frequent symptoms in patients with multiple sclerosis (MS) but its underlying mechanisms are poorly understood. A number of pathogenetic correlates have previously been proposed including psychosocial factors (such as depression and fatigue), inflammation, neurodegeneration, and neuroendocrine dysregulation. However, these different systems have never been studied in parallel and their differential contributions to cognitive impairment in MS are unknown. We studied a well-characterized cohort of cognitively impaired (CI, n=25) and cognitively preserved (CP, n=25) MS patients based on a comprehensive neuropsychological testing battery, a test of hypothalamo-pituitary-adrenal axis functioning (dexamethasone-corticotropin-releasing hormone suppression test, Dex-CRH test) as well as peripheral blood and MRI markers of inflammatory activity. CI patients had significantly higher disability. In addition, CI patients showed higher levels of fatigue and depression. Fatigue was more closely associated with measures of attention while depression showed strongest correlations with memory tests. Furthermore, percentage of IFNγ-positive CD4+ and CD8+ T cells showed modest correlations with processing s...Continue Reading

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