Oral tolerance and Treg cells are induced in BALB/c mice after gavage with bovine ß-lactoglobulin.
Allergy
; 66(10): 1312-21, 2011 Oct.
Article
in En
| MEDLINE
| ID: mdl-21615416
ABSTRACT
BACKGROUND:
Food allergy is considered as resulting from an impaired development or a breakdown of oral tolerance. We aimed to induce oral tolerance to the major cow's milk allergen bovine ß-lactoglobulin (BLG) or corresponding trypsin hydrolysates (BLG-Try) and to investigate the mechanisms involved.METHODS:
Wild-type BALB/cJ mice were gavaged on days 1-3 and 8-10 with different doses of native BLG (nBLG) or with nBLG-Try and were then sensitized on day 14 by i.p. administration of BLG in alum. Sensitization was assessed by measurement of BLG-specific antibodies in sera and of cytokines secreted by BLG-reactivated splenocytes. Elicitation of the allergic reaction was assessed by measurement of cytokines and mMCP-1 in sera collected 35 min after an oral challenge. Cellular and biochemical markers of the allergic reaction were also analysed in bronchoalveolar lavage fluids (BAL) collected 24 h after intra-nasal challenge. Analysis of the CD4(+) CD25(+) Foxp3(+) cells in different organs obtained 3 days after gavage and in vivo depletion of CD25(+) cells before oral tolerance induction were then performed.RESULTS:
Systemic sensitization and elicitation of the allergic reaction were totally inhibited in mice gavaged with 2 mg of nBLG whereas nBLG-Try was far less efficient. A high percentage of CD4(+) Foxp3(+) cells were observed in BAL from tolerant mice, and a negative correlation between the number of eosinophils and the percentage of Foxp3(+) cells was evidenced. Efficient induction of CD4(+) CD25(+) Foxp3(+) cells after nBLG gavage and impaired oral tolerance induction after in vivo depletion of CD25 cells were then demonstrated.CONCLUSION:
For the first time, allergen-induced Treg cells that inhibited both the sensitization and the elicitation of the allergic reaction were evidenced in gavaged wild-type mice.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
T-Lymphocytes, Regulatory
/
Immune Tolerance
/
Lactoglobulins
Limits:
Animals
Language:
En
Journal:
Allergy
Year:
2011
Type:
Article
Affiliation country:
France