Disruption of T-cell immunoglobulin and mucin domain molecule (TIM)-1/TIM4 interaction as a therapeutic strategy in a dendritic cell-induced peanut allergy model.
BACKGROUND
Recent reports indicate that dendritic cell (DC)-derived T-cell immunoglobulin and mucin domain molecule (TIM)-4 plays an important role in the initiation of T(H)2 polarization. This study aims to elucidate the mechanisms of peanut allergy mediated by microbial products and DCs and the relationship between peanut allergy and TIM4.


METHODS
Mouse bone marrow-derived DCs (BMDCs) were generated and exposed to cholera toxin (CT) or/and peanut extract (PE) for 24 hours and then adoptively transferred to naive mice. After re-exposure to specific antigen PE, the mice were killed; intestinal allergic status was determined.


RESULTS
Increased expression of TIM4 and costimulatory molecules was detected in BMDCs after concurrent exposure to CT and PE. Adoptively transferred CT/PE-conditioned BMDCs resulted in the increases in serum PE-specific IgE and skewed T(H)2 polarization in the intestine. Oral challenge with specific antigen PE induced mast cell activation in the intestine. Treating with Toll-like receptor 4 small interfering RNA abolished increased expression of TIM4 and costimulatory molecules by BMDCs. Pretreatment with anti-TIM1 or anti-TIM4 antibody abolished PE-specific T(H)2 polarization and allergy in the intestine.


CONCLUSIONS
Concurrent exposure to microbial product CT and food antigen PE increases TIM4 expression in DCs and promotes DC maturation, which plays an important role in the initiation of PE-specific T(H)2 polarization and allergy in the intestine. Modulation of TIM4 production in DCs represents a novel therapeutic approach for the treatment of peanut allergy.
Brain-Body Institute, McMaster University, Hamilton, Ontario, Canada.
Bai-Sui
BS
Feng
Xiao
X
Chen
Shao-Heng
SH
He
Peng-Yuan
PY
Zheng
Jane
J
Foster
Zhou
Z
Xing
John
J
Bienenstock
Ping-Chang
PC
Yang
D000818:Animals; D010367:Arachis / Q000276:immunology; D002454:Cell Differentiation; D049109:Cell Proliferation; D002772:Cholera Toxin / Q000276:immunology; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D004195:Disease Models, Animal; D000072596:Hepatitis A Virus Cellular Receptor 1; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000276:immunology; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D021183:Peanut Hypersensitivity / Q000276:immunology* / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D018418:Th2 Cells / Q000276:immunology* / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000276:immunology / Q000378:metabolism
C442240:Havcr1 protein, mouse; D000072596:Hepatitis A Virus Cellular Receptor 1; D008565:Membrane Proteins; C500399:TIM-4 protein, mouse; C493487:Tlr4 protein, mouse; D051197:Toll-Like Receptor 4; D002772:Cholera Toxin