Mental deterioration correlates with response of natural killer (NK) cell activity to physiological modifiers in patients with short history of Alzheimer's disease

Psychoneuroendocrinology
R G MaseraA Angeli

Abstract

Natural killer (NK) cell activity of peripheral blood mononuclear (PBM) cells was measured in 16 subjects with mild to moderate senile dementia of Alzheimer's type (sDAT) chosen for short history of disease and no medication, and in 17 age- and sex-matched controls. Levels of cytotoxicity at baseline and after PBM cell exposure to modifiers either negative (cortisol 10(-6) M) or positive (rIL-2 650 IU/ml and rIFN-gamma 100 UI/ml, respectively) were related to indices of hypothalamic-pituitary-adrenal (HPA) function and Gottfries Bråne Rating Scale (GBS) score for mental deterioration. Spontaneous NK cell activity was not significantly different in sDAT subjects vs controls. In vitro inhibition by cortisol was lower in sDAT (P<0.05); cytokine-induced changes were greater (rIL-2, P<0.02; rIFN-gamma, P<0.05). Percent negative or positive variations from baseline significantly correlated with GBS scores (P<0.05 or less). Serum cortisol and cortisol/DHEAS molar ratio at 0800 h were significantly higher in sDAT (P<0.05 and P<0.02, respectively). Cortisol/DHEA ratio positively correlated with GBS scores (P<0.02). Moreover, the ratios of incremental area of response ACTH/cortisol and beta-endorphin/cortisol after 1 microg/kg ovine-cort...Continue Reading

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Citations

Dec 21, 2006·Journal of Neuroinflammation·Donald J LehmannA David Smith
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