Plasma Membrane Protein Profiling in Beta-Amyloid-Treated Microglia Cell Line
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Updated: Feb 24, 2026
Correlative Light and Electron Microscopy to Study Microglial Interactions with β-Amyloid Plaques
Published on: June 1, 2016
Virginia Correani1, Laura Di Francesco1, Giuseppina Mignogna1
1Dipartimento di Scienze Biochimiche, Sapienza Università di Roma, Rome, Italy.
Abstract:
In the responsiveness of microglia to toxic stimuli, plasma membrane proteins play a key role. In this study we treated with a synthetic beta amyloid peptide murine microglial cells metabolically differently labelled with stable isotope amino acids (SILAC). The plasma membrane was selectively enriched by a multi-stage aqueous two-phase partition system. We were able to identify by 1D-LC-MS/MS analyses 1577 proteins, most of them are plasma membrane proteins according to the Gene Ontology annotation. An unchanged level of amyloid receptors in this data set suggests that microglia preserve their responsiveness capability to the environment even after 24-h challenge with amyloid peptides. On the other hand, 14 proteins were observed to change their plasma membrane abundance to a statistically significant extent. Among these, we proposed as reliable biomarkers of the inflammatory microglia phenotype in AD damaged tissues MAP/microtubule affinity-regulating kinase 3 (MARK3), Interferon-induced transmembrane protein 3 (IFITM3), Annexins A5 and A7 (ANXA5, ANXA7) and Neuropilin-1 (NRP1), all proteins known to be involved in the inflammation processes and in microtubule network assembly rate.
Insights
Microglia, key immune cells in the brain, respond to amyloid peptides by altering plasma membrane proteins. Researchers identified potential biomarkers for inflammatory microglia in Alzheimer's disease (AD).
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Microglia are crucial for brain immunity and respond to toxic stimuli.
- Plasma membrane proteins are central to microglial responsiveness.
- Alzheimer's disease (AD) involves neuroinflammation and microglial activation.
Purpose of the Study:
- To investigate changes in plasma membrane proteins of microglia upon exposure to beta-amyloid peptides.
- To identify potential biomarkers for inflammatory microglia phenotypes in AD.
Main Methods:
- Murine microglial cells were treated with synthetic beta-amyloid peptides.
- Metabolic labeling with stable isotope amino acids (SILAC) was employed.
- Plasma membrane proteins were enriched using aqueous two-phase partitioning.
- Protein identification and quantification were performed using 1D-LC-MS/MS.
Main Results:
- 1577 proteins were identified, predominantly plasma membrane proteins.
- Amyloid receptor levels remained unchanged, indicating preserved microglial responsiveness.
- 14 proteins showed significant changes in plasma membrane abundance.
- MARK3, IFITM3, ANXA5, ANXA7, and NRP1 were identified as potential biomarkers for inflammatory microglia.
Conclusions:
- Microglia maintain responsiveness to amyloid peptides after 24-hour challenge.
- Specific plasma membrane proteins (MARK3, IFITM3, ANXA5, ANXA7, NRP1) can serve as biomarkers for inflammatory microglia in AD.
- These identified proteins are involved in inflammation and microtubule dynamics.
