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Histamine improves antigen uptake and cross-presentation by dendritic cells
Maria Marta Amaral1, Carlos Davio, Ana Ceballos
1Institute of Hematologic Research, National Academy of Medicine and National Reference Center for AIDS, Department of Microbiology, Buenos Aires University School of Medicine, Buenos Aires, Argentina.
Histamine enhances dendritic cell (DC) functions like endocytosis and cross-presentation of soluble allergens, potentially impacting allergic responses. This effect depends on the antigen form and specific histamine receptors involved.
Area of Science:
- Immunology
- Cell Biology
- Allergy Research
Background:
- Histamine modulates dendritic cell (DC) function, influencing DC differentiation and T cell responses.
- Previous research indicates histamine's role in DC chemotaxis and Th2 cell differentiation.
Purpose of the Study:
- To investigate histamine's modulation of endocytosis and cross-presentation by immature DCs.
- To determine the histamine receptor subtypes involved in these DC functions.
Main Methods:
- Assessed endocytosis of soluble HRP and FITC-OVA by DCs.
- Evaluated cross-presentation of soluble OVA and OVA on latex beads.
- Utilized histamine receptor antagonists (cimetidine, thioperamide) to identify involved receptors.
Main Results:
- Histamine significantly increased endocytosis and cross-presentation of soluble antigens.
- Histamine2 receptor (H2R) mediated endocytosis enhancement, while H3R/H4R mediated cross-presentation stimulation.
- Histamine did not enhance uptake or cross-presentation of particulate OVA (latex beads).
Conclusions:
- Histamine's effects on DC endocytosis and cross-presentation are antigen-form dependent.
- Histamine may promote soluble allergen cross-presentation by DCs, potentially activating allergen-specific T CD8+ cells.
- This mechanism could contribute to the development of airway allergic responses.
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