Targeting CD22 on memory B cells to induce tolerance to peanut allergens

Area of Science:

• Immunology
• Allergy Research
• B cell immunology

Background:

• Severe allergic reactions to peanuts are sustained by peanut allergen-specific memory B cells.
• Existing treatments often focus on managing symptoms rather than inducing tolerance.

Purpose of the Study:

• To investigate if targeting CD22 on peanut-specific memory B cells can induce tolerance to peanut allergens.
• To evaluate the efficacy of Siglec-engaging tolerance-inducing antigenic liposomes (STALs) in peanut allergy models.

Main Methods:

• Developed STALs (CD22L-STALs) co-displaying peanut allergens and a CD22 ligand.
• Tested CD22L-STALs in various mouse models of peanut allergy, including those with human CD22 expression.
• Assessed the impact on B cells and allergen-specific immunoglobulin levels in vivo.

Main Results:

• CD22L-STALs significantly suppressed systemic allergic memory to peanut allergens (Ara h 1, 2, 3) in mice.
• Reduced allergen-specific IgE, IgG1, and anaphylaxis were observed following CD22L-STAL treatment.
• Tolerance was prolonged for at least 3 months, and human B cells were successfully tolerized in vivo.

Conclusions:

• Targeting CD22 on memory B cells via antigen-specific STALs can induce systemic immune tolerance.
• This strategy represents a novel therapeutic approach for peanut allergy.