TH2-polarized immunological memory to inhalant allergens in atopics is established during infancy and early childhood

Yabuhara, A., Macaubas, C., Prescott, S. L.., Venaille, T. J., Holt, B. J., Habre, W., Sly, P. D. and Holt, P. G. (1997) TH2-polarized immunological memory to inhalant allergens in atopics is established during infancy and early childhood. Clinical and Experimental Allergy, 27 11: 1261-1269. doi:10.1046/j.1365-2222.1997.990906.x


Author Yabuhara, A.
Macaubas, C.
Prescott, S. L..
Venaille, T. J.
Holt, B. J.
Habre, W.
Sly, P. D.
Holt, P. G.
Title TH2-polarized immunological memory to inhalant allergens in atopics is established during infancy and early childhood
Journal name Clinical and Experimental Allergy   Check publisher's open access policy
ISSN 0954-7894
1365-2222
Publication date 1997-11-01
Sub-type Article (original research)
DOI 10.1046/j.1365-2222.1997.990906.x
Volume 27
Issue 11
Start page 1261
End page 1269
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Language eng
Formatted abstract
Background: There is increasing evidence that the T-cell reactivity to environmental allergens underlying expression of allergic disease in adulthood, develops initially during childhood. However, there is little information available on the kinetics of these early responses, or on the patterns of cytokine production during this period.

Objective: The purpose of this study was twofold: to obtain further information on the reported differences between responses to food versus inhalant allergens during early childhood, and to ascertain the age-range over which T-cell responses to inhalant allergens become polarized towards the TH2 cytokine profile, in potentially atopic children.

Methods: In Vitro cytokine responses to house dust mite (HDM) and egg (OVA) were assessed by semiquantitative RT-PCR in panels of 2- and 5-year-old children and adults; lymphoproliferative responses to OVA were subjected to epitope analysis.

Results: At age 2 years IL-4/IL-5 responses to HDM grouped with positive atopic family history, and by age 5 years cytokine responses correlated strongly with individual SPT reactivity to HDM; In contrast, OVA responses were restricted to weak and transient IL-5 signals in the 2-year-old family history positive group. Lymphoproliferation assays performed in parallel indicate a log-scale greater postnatal expansion of T-cell reactivity to the inhalant allergen; preliminary epitope analysis of OVA responses indicate that the number of OVA epitopes recognised decrease during early childhood.

Conclusions: Inhalant allergen-specific in vitro cytokine production associated with positive skin- prick test (SPT) reactions, one of the hallmarks of adult atopy, manifests in children at or before 5 years of age; additionally, cytokine responses in SPT negative 5 year-olds are restricted to IFNχ, as per normal adults. In contrast, T-cell responses to a typical food allergen appear to be deleted during early childhood.
Keyword Allergy
Th1/th2
Tolerance/suppression
Immunotherapy
Oral tolerance
Immunotherapy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Health and Behavioural Sciences -- Publications
 
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Created: Wed, 17 Nov 2010, 21:59:04 EST