Acute Communication Between Microglia and Nonparenchymal Immune Cells in the Anti-Aβ Antibody-Injected Cortex

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Anti-amyloid-beta (Aβ) immunotherapy is increasingly used for Alzheimer's disease.
• Understanding the brain's cellular responses to these therapies is crucial but limited.

Purpose of the Study:

• To investigate the acute cellular and immune responses in the brain following anti-Aβ antibody administration.
• To identify changes in cell-to-cell communication and signaling pathways.

Main Methods:

• Intracranial injection of anti-Aβ IgG1 (6E10) or control IgG1 into APP mice.
• Glial cell-enriched preparation and single-cell sequencing of cortical tissue at 24 hours and 3 days post-injection.
• Analysis of cell types, proportions, and ligand-receptor (L-R) mediated cell-to-cell communications.

Main Results:

• Anti-Aβ antibody treatment increased ligand-receptor (L-R) communications between cell types, particularly at 24 hours.
• While L-R communications were more numerous in the anti-Aβ group at 3 days, connection strength was higher in the control group.
• A significant early emphasis on microglia-to-nonparenchymal immune cell communication via the TGFβ signaling pathway was observed.

Conclusions:

• Anti-Aβ antibodies induce distinct acute changes in brain cell communication patterns.
• These findings provide insights into the brain's immediate immune response to anti-Aβ therapies.
• The study establishes a foundation for further research into the neuro-immunological effects of Alzheimer's disease treatments.