Deakin University

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Developing patterns of T cell memory to environmental allergens in the first two years of life

conference contribution
posted on 1997-01-01, 00:00 authored by S L Prescott, C Macaubas, A Yabuhara, T J Venaille, B J Holt, W Habre, R Loh, Peter Sly, P G Holt
Several recent studies have demonstrated cord blood mononuclear cell (CBMC) proliferation in response to food and inhalant allergens, suggesting that initial T-cell-priming may occur in utero. The findings below from an ongoing prospective study on 60 subjects provide initial information on the nature of accompanying T cell cytokine responses. We demonstrate CBMC proliferation following culture with house dust mite and ovalbumin (OVA) in 47 and 42% of subjects, respectively, compared to an overall rate of 3% for tetanus toxoid; the frequencies of these responses were comparable in neonates with and without atopic family history (FH). With the exception of IL-10, analysis of cytokine responses in allergen-stimulated cultures of CBMCs required the use of semiquantitative RT-PCR, which revealed low-level IL-4 and/or IL-5 mRNA production, in particular a 50% IL-5 response rate to OVA in FH-positive neonates. IFN-γ responses were less frequent and required higher PCR cycle numbers for detection. Preliminary analysis of culture supernatants from a subgroup of CBMCs indicate high-level allergen-specific IL-10 responses in both FH-negative and -positive subjects, detectable by ELISA. Parallel PCR studies on MCs from 27 children (mean age 18 months) indicated a clear segregation at this age on the basis of FH, with Th0-like or mixed Th1/Th2 responses (IL-5 plus IFN-γ) which were mainly restricted to the FH-positive group. © 1997 S. Karger AG, Basel.







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Title of proceedings

International Archives of Allergy and Immunology