title: Immunophenotypes in the circulation of patients with mild cognitive impairment.
abstract: Alterations in the peripheral immune system are associated with dementia and the neuropathology of Alzheimer's disease, but have yet to be studied early in the disease process. To test the hypothesis that the balance of immune cell phenotypes is disrupted in the early progression of memory deterioration, patients with mild cognitive impairment (MCI) and healthy elderly controls were examined for the distribution of subpopulations of leukocytes (lymphocytes, granulocytes, and monocytes) and lymphocyte subtypes (helper/inducer and suppressor/cytotoxic T lymphocytes and B lymphocytes) in blood. MCI subjects had a significantly higher percentage of total lymphocytes and a lower percentage of granulocytes compared to elderly controls. Furthermore, the expression of cell surface amyloid precursor protein (APP) and intracellular amyloid-beta peptide (Abeta) in lymphocytes and monocytes were determined. We found lymphocyte APP expression to be significantly increased in MCI subjects compared to controls. Our data indicate that changes in immunological parameters may be detected early in MCI, and an alteration of the immune response may precede clinical AD.
authors.affiliation: Center for Neurosurgery Research, Coleman Pavilion, Loma Linda University School of Medicine, Loma Linda, CA 92350, USA.
authors.forename: Shino
authors.initials: S
authors.lastname: Magaki
authors.forename: Steven M
authors.initials: SM
authors.lastname: Yellon
authors.forename: Claudius
authors.initials: C
authors.lastname: Mueller
authors.forename: Wolff M
authors.initials: WM
authors.lastname: Kirsch
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000453:epidemiology* / Q000276:immunology*; D016564:Amyloid beta-Protein Precursor / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D003072:Cognition Disorders / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006098:Granulocytes / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D047908:Intracellular Signaling Peptides and Proteins / Q000276:immunology; D008297:Male; D008565:Membrane Proteins / Q000276:immunology; D009483:Neuropsychological Tests; D012720:Severity of Illness Index; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016564:Amyloid beta-Protein Precursor; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins