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Brain Pathol. 2015 Jul;25(4):469-80. doi: 10.1111/bpa.12190. Epub 2014 Nov 11.

TREM2 Protein Expression Changes Correlate with Alzheimer's Disease Neurodegenerative Pathologies in Post-Mortem Temporal Cortices.

Author information

1
Laboratory of Neuroregeneration, Banner Sun Health Research Institute, Sun City, AZ.
2
W. H. Civin Laboratory for Neuropathology, Banner Sun Health Research Institute, Sun City, AZ.
3
Laboratory of Neuroinflammation, Banner Sun Health Research Institute, Sun City, AZ.

Abstract

Triggering receptor expressed by myeloid cells 2 (TREM2), a member of the immunoglobulin superfamily, has anti-inflammatory phagocytic function in myeloid cells. Several studies have shown that TREM2 gene variant rs75932628-T increased the risks for Alzheimer's disease (AD), Parkinson's disease, frontotemporal dementia and amyotrophic lateral sclerosis. It has been suggested that the risks could be resulted from the loss of TREM2 function caused by the mutation. Indeed, new evidence showed that several mutations in the immunoglobulin-like V-region led to low cell surface expression of TREM2 and reduced phagocytic function. Because of the emerging importance in understanding TREM2 expression and functions in human neurodegenerative diseases, we conducted biochemical and morphological studies of TREM2 expression in human post-mortem temporal cortical samples from AD and normal cases. Increased expression of TREM2 protein was found to significantly correlate with increases of phosphorylated-tau and active caspase 3, a marker of apoptosis, and also loss of the presynaptic protein SNAP25. Strong intensities of TREM2 immunoreactivity were observed in the microglia associated with amyloid plaques and in neuritic pathology-enriched areas. Based on the findings that TREM2 expression correlated with neurodegenerative markers, further investigation on whether there is abnormality of TREM2 functions in AD brains with nonmutated TREM2 is needed.

KEYWORDS:

TREM2; amyloid; brain; human; microglia; tau

PMID:
25186950
PMCID:
PMC4427527
DOI:
10.1111/bpa.12190
[Indexed for MEDLINE]
Free PMC Article

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