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Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation
Published on: July 23, 2012
Large-scale HLA immunopeptidome and interactome profiling in microglia
Sydney Klaisner1, Ying Hao1, Alexandra Beilina2
1Center for Alzheimer's and Related Dementias (CARD), National Institute on Aging and National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.
Microglia present brain-specific HLA epitopes, including those from Alzheimer's and dementia genes. This reveals mechanisms of neurodegenerative disease and adaptive immunity in the central nervous system.
Area of Science:
- Neuroimmunology
- Neurodegenerative Diseases
- Immunology
Background:
- Microglia are key brain immune cells and antigen-presenting cells.
- The human leukocyte antigen (HLA) complex is linked to neurodegenerative disease risk.
- The role of HLA in microglia function in neurodegeneration is not well understood.
Purpose of the Study:
- To investigate HLA epitopes and their protein interactions in human induced pluripotent stem cell (iPSC)-derived microglia-like cells (iMGLs).
- To explore the impact of HLA on microglia function in the context of neurodegenerative diseases.
Main Methods:
- Mass spectrometry-based immunopeptidomics and whole-cell proteomics.
- Affinity purification and prediction algorithms.
- Analysis of iPSC-derived microglia-like cells (iMGLs) and interferon-gamma (IFNγ) stimulated iMGLs.
Main Results:
- Identified nearly 7,000 HLA class I and II presented peptides in microglia.
- Distinguished immunopeptidome landscapes across iPSCs, iMGLs, and IFNγ-stimulated iMGLs.
- Detected 25 HLA epitopes from 15 genes linked to Alzheimer's and related dementias (ADRD), and predicted 31 mutant epitopes.
Conclusions:
- Microglia present HLA epitopes derived from ADRD-associated genes, including mutated forms.
- HLA interacts with immune-related proteins in microglia, particularly upon IFNγ stimulation.
- This study elucidates antigen presentation and adaptive immunity mechanisms in the CNS relevant to neurodegeneration.
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