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The CD48 receptor mediates Staphylococcus aureus human and murine eosinophil activation
Y Minai-Fleminger1, R S Gangwar, H Migalovich-Sheikhet
1Pharmacology & Experimental Therapeutics, Institute for Drug Research, School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel.
Summary
CD48 plays a key role in eosinophil activation by Staphylococcus aureus (SA) and its toxins, crucial for allergic responses like atopic dermatitis (AD). Blocking CD48 offers a potential therapeutic target for these conditions.
Area of Science:
- Immunology
- Dermatology
- Molecular Biology
Background:
- Allergy involves eosinophilia and susceptibility to microbial infections.
- Atopic dermatitis (AD) is linked to Staphylococcus aureus (SA) colonization.
- Mechanisms of SA exotoxin interaction with eosinophils are not fully understood.
- CD48, a receptor on eosinophils, is implicated in allergic asthma and mast cell-SA cross-talk.
Purpose of the Study:
- Investigate the role of CD48 on human and mouse eosinophils in response to heat-killed SA and its exotoxins (SEB, PtA, PGN).
Main Methods:
- Eosinophils isolated from human blood and mouse bone marrow (WT and CD48-/-).
- Analysis of eosinophil-SA/exotoxin interactions via microscopy, adhesion, degranulation, cytokine release, and cell signaling.
- Induction of peritonitis using SEB in CD48-/- and WT mice.
- CD48 expression analysis in AD patients' skin and peripheral blood leukocytes.
Main Results:
- Direct physical interaction observed between eosinophils and SA/exotoxins.
- Increased CD48 expression on eosinophils in AD skin, decreased in peripheral blood.
- SA/exotoxins enhanced CD48 expression, bound to CD48, and activated eosinophils.
- Blocking CD48 reduced these effects in human and mouse eosinophils.
- CD48 deficiency altered inflammatory responses in a SEB-induced peritonitis model.
Conclusions:
- CD48 is crucial for SA/exotoxin-induced eosinophil activation during allergic responses.
- CD48 represents a novel therapeutic target for allergies, particularly atopic dermatitis.
