Cross-Linking Cellular Prion Protein Induces Neuronal Type 2-Like Hypersensitivity

Area of Science:

• Neuroscience
• Immunology
• Molecular Biology

Background:

• Previous studies linked anti-PrP antibodies to neurotoxicity and apoptosis.
• The precise mechanisms of IgG-mediated neurotoxicity and the role of specific proteins remained undefined.
• Proteins implicated in anti-PrP antibody-mediated apoptosis are also involved in allergic responses.

Purpose of the Study:

• To investigate if anti-PrP antibody binding to PrP^C stimulates a neuronal allergenic response.
• To identify the role of microglia in this potential allergenic reaction.
• To assess the implications for therapeutic antibody development.

Main Methods:

• In-silico prediction of epitope allergenicity.
• Treatment of primary neurons (MPN), neuroblastoma cells (N2a), and microglia (N11) with anti-PrP antibodies.
• Co-culture experiments involving treated cells.
• Analysis of allergenic-related protein expression and cytokine release (NO, IL6, TNF-α).

Main Results:

• In-silico analysis predicted allergenicity for epitopes of known neurotoxic anti-PrP antibodies.
• Anti-PrP antibody treatment induced neuronal allergenic responses in N2a, N11, and MPN cells.
• Co-culture of antibody-treated microglia with neuroblastoma cells potentiated allergenic effects.
• Significant accumulation of nitric oxide (NO) and IL6 was observed in co-cultures.

Conclusions:

• Anti-PrP antibody binding to PrP^C induces a neuronal hypersensitivity response.
• Microglia are crucial in mediating IgG-induced neuronal hypersensitivity.
• Allergenic assessment of therapeutic antibodies is vital for safe neurodegenerative disease treatments.