Abstract
Alzheimer’s disease (AD) is an irreversible neurodegenerative disease that affects an increasing number of individuals worldwide. The underlying cause(s) of the late-onset form (LOAD) of the disease is still a matter of intensive investigations. The possibility that infectious organisms are involved in the etiology of AD has been gaining momentum. Furthermore, a wealth of data has suggested the involvement of the immune system in AD. In this context, properties of cells of the innate immune system such as natural killer (NK) cells specialized in destroying virus-infected cells have recently been investigated in amnestic mild cognitive impairment (aMCI) subjects and patients with a mild form (mAD) of the disease and data compared to healthy elderly individuals. These studies revealed an absence of differences in immune senescence between the three experimental groups. However, there were differential phenotypic changes in aMCI and mAD patients. This was the case of TLR2 and TLR9 (both decreased in AD) and NKG2A (decreased in aMCI). However, functional assays revealed an absence of modification of killing and degranulation activity in the cohort despite increased CD95 receptor, granzyme B expression, and upregulation of TNFα and IFNγ production. Furthermore, decreased chemotactic activity to CCL19 but not to CCL21 was observed in aMCI and mAD patients. Increased CD16 expression was observed in mAD patients. The bulk of these data suggested that NK cells of aMCI subjects were in a state of activation state in response of an as-yet-unidentified challenge.
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Abbreviations
- AD:
-
Alzheimer’s disease
- ADCC:
-
Antibody-dependent cell-mediated cytotoxicity
- BBB:
-
Blood-brain barrier
- CD:
-
Cluster of differentiation
- CNS:
-
Central nervous system
- EOAD:
-
Early onset of Alzheimer’s disease
- IFN:
-
Interferon
- KIR:
-
Killer-cell immunoglobulin-like receptor
- LOAD:
-
Late onset of Alzheimer’s disease
- MHC:
-
Major histocompatibility complex
- NK:
-
Natural killer
- TLR:
-
Toll-like receptor
- TNF:
-
Tumor necrosis factor
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Le Page, A., Dupuis, G., Fülöp, T. (2019). Natural Killer Cells and Alzheimer’s Disease. In: Fulop, T., Franceschi, C., Hirokawa, K., Pawelec, G. (eds) Handbook of Immunosenescence. Springer, Cham. https://doi.org/10.1007/978-3-319-64597-1_146-1
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