Abstract
We examined amyloid precursor protein (APP) surface expression on circulating leukocytes and in brain tissues from normal individuals and HIV+ subjects with cognitive impairment. Most monocytes, and a subset of B-lymphocytes, expressed APP, while T-lymphocytes, granulocytes, and natural killer (NK) cells did not. CD14bright/CD16+ monocytes expressed the highest levels, and CD14dim/CD16+ cells were negative, suggesting a relationship with activation. Higher APP+ monocyte levels correlated with increased numbers of CD16+ monocytes, but not with the degree of cognitive impairment. Treatment of monocytes with M-CSF, but not LPS, upregulated APP expression. In the brain, APP appeared as axonal immunoreactivity and diffuse plaques, and APP+ perivascular macrophages were seen in cases with severe dementia. APP may facilitate monocyte entry into the brain.
Original language | English (US) |
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Pages (from-to) | 99-110 |
Number of pages | 12 |
Journal | Journal of Neuroimmunology |
Volume | 157 |
Issue number | 1-2 SPEC. ISS. |
DOIs | |
State | Published - Dec 2004 |
Keywords
- APP
- CD16
- M-CSF
- Macrophage
- Monocyte
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology
- Neurology
- Clinical Neurology