Basophils and mast cells play critical roles for leukocyte recruitment in IgE-mediated cutaneous reverse passive Arthus reaction.
BACKGROUND
The pathogenic role of IgE has been implicated in a variety of allergic and inflammatory diseases. We have previously established an IgE-mediated cutaneous reverse passive Arthus model in which eosinophil infiltration is a prominent feature. This uniquely provides a model of type III hypersensitivity in which Fc classes of Ig that forms immune complex differentially determine the disease manifestation.


OBJECTIVE
To investigate the mechanisms of how mast cells and basophils regulate this IgE-mediated Arthus reaction.


METHODS
IgE-mediated cutaneous reverse passive Arthus reaction was induced in wild-type C57BL/6 or WBB6F1-+/+ mice and mast-cell-deficient WBB6F1-W/W(v) mice by intradermal injection of IgE anti-trinitrophenyl antibodies followed immediately by intravenous administration of trinitrophenyl bovine serum albumin. Basophils were depleted in vivo using anti-CD200R3 monoclonal antibody prior to the IC challenge.


RESULTS
Hemorrhage and infiltration of eosinophils, neutrophils, and basophils were significantly reduced but were not completely abrogated in WBB6F1-W/W(v) mice compared with those in wild-type WBB6F1-+/+ mice. Wild-type C57BL/6 mice treated by basophil-depleting mAb also showed significantly decreased hemorrhage and inflammatory cell infiltration, especially that of eosinophils, compared with control mice. Furthermore, basophil depletion in WBB6F1-W/W(v) mice led to nearly complete inhibition of eosinophil recruitment. By contrast, basophil depletion did not further decrease neutrophil infiltration in WBB6F1-W/W(v) mice.


CONCLUSIONS
While mast cells play a central role, basophils also have an important function, especially for eosinophil recruitment, in IgE-mediated cutaneous reverse passive Arthus reaction.
Department of Dermatology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan.
Guihua
G
Jin
Takashi
T
Matsushita
Yasuhito
Y
Hamaguchi
Doanh
D
Le Huu
Takayuki
T
Ishii
Minoru
M
Hasegawa
Kazushige
K
Obata
Hajime
H
Karasuyama
Kazuhiko
K
Takehara
Manabu
M
Fujimoto
D000818:Animals; D001183:Arthus Reaction; D001491:Basophils / Q000378:metabolism*; D004804:Eosinophils / Q000378:metabolism; D006967:Hypersensitivity / Q000378:metabolism; D007105:Immune Complex Diseases / Q000378:metabolism; D007073:Immunoglobulin E / Q000737:chemistry*; D007249:Inflammation; D007962:Leukocytes / Q000166:cytology*; D008407:Mast Cells / Q000166:cytology*; D008562:Membrane Glycoproteins / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic
C492346:CD200 receptor, mouse; D008562:Membrane Glycoproteins; D007073:Immunoglobulin E