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CD36, a class B scavenger receptor, is expressed on microglia in Alzheimer's disease brains and can mediate production of reactive oxygen species in response to beta-amyloid fibrils.
- Source :
-
The American journal of pathology [Am J Pathol] 2002 Jan; Vol. 160 (1), pp. 101-12. - Publication Year :
- 2002
-
Abstract
- A pathological hallmark of Alzheimer's disease is the senile plaque, composed of beta-amyloid fibrils, microglia, astrocytes, and dystrophic neurites. We reported previously that class A scavenger receptors mediate adhesion of microglia and macrophages to beta-amyloid fibrils and oxidized low-density lipoprotein (oxLDL)-coated surfaces. We also showed that CD36, a class B scavenger receptor and an oxLDL receptor, promotes H(2)O(2) secretion by macrophages adherent to oxLDL-coated surfaces. Whether CD36 is expressed on microglia, and whether it plays a role in secretion of H(2)O(2) by microglia interacting with fibrillar beta-amyloid is not known. Using fluorescence-activated cell sorting analysis and immunohistochemistry, we found that CD36 is expressed on human fetal microglia, and N9-immortalized mouse microglia. We also found that CD36 is expressed on microglia and on vascular endothelial cells in the brains of Alzheimer's disease patients. Bowes human melanoma cells, which normally do not express CD36, gained the ability to specifically bind to surfaces coated with fibrillar beta-amyloid when transfected with a cDNA encoding human CD36, suggesting that CD36 is a receptor for fibrillar beta-amyloid. Furthermore, two different monoclonal antibodies to CD36 inhibited H(2)O(2) production by N9 microglia and human macrophages adherent to fibrillar beta-amyloid by approximately 50%. Our data identify a role for CD36 in fibrillar beta-amyloid-induced H(2)O(2) production by microglia, and imply that CD36 can mediate binding to fibrillar beta-amyloid. We propose that similar to their role in the interaction of macrophages with oxLDL, class A scavenger receptors and CD36 play complimentary roles in the interactions of microglia with fibrillar beta-amyloid.
- Subjects :
- Amyloid beta-Peptides chemistry
Amyloid beta-Peptides pharmacology
Animals
Antibodies pharmacology
Cell Adhesion
Cell Line
Cell Line, Transformed
Fetus cytology
Humans
Macrophages physiology
Mice
Microglia drug effects
Peptide Fragments metabolism
Peptide Fragments pharmacology
Peroxides metabolism
Phagocytes drug effects
Phagocytes metabolism
Rats
Receptors, Scavenger
Scavenger Receptors, Class A
Scavenger Receptors, Class B
Alzheimer Disease metabolism
Amyloid beta-Peptides physiology
Brain metabolism
CD36 Antigens physiology
Membrane Proteins
Microglia metabolism
Reactive Oxygen Species metabolism
Receptors, Immunologic physiology
Receptors, Lipoprotein
Subjects
Details
- Language :
- English
- ISSN :
- 0002-9440
- Volume :
- 160
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- The American journal of pathology
- Publication Type :
- Academic Journal
- Accession number :
- 11786404
- Full Text :
- https://doi.org/10.1016/s0002-9440(10)64354-4