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Related Experiment Videos

Decrease of allergen-specific T-cell response induced by local nasal immunotherapy

L Giannarini1, E Maggi

  • 1Clinical Immunology Department, Istituto di Medicina Interna e Immunoallergologia, Università di Firenze, Italy.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|June 26, 1998
PubMed
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Local nasal immunotherapy (LNIT) and subcutaneous immunotherapy (SIT) reduce allergic rhinitis symptoms by inducing T-cell tolerance. Both treatments decrease T-cell proliferation, offering a mechanism for clinical improvement in allergic patients.

Area of Science:

  • Immunology
  • Allergy Research
  • Clinical Trials

Background:

  • Local nasal immunotherapy (LNIT) efficacy is known, but its immunological effects remain unclear.
  • Understanding LNIT's impact on immune responses is crucial for explaining clinical benefits in allergic rhinitis.

Purpose of the Study:

  • To investigate LNIT's effects on T-cell response, cytokine production, and antibody levels.
  • Compare immunological changes induced by LNIT versus subcutaneous immunotherapy (SIT).

Main Methods:

  • Randomized 2-year study comparing untreated, SIT, and LNIT groups with grass-sensitive rhinitis patients.
  • Assessed peripheral blood mononuclear cell (PBMC) proliferation to Rye-1 allergen, serum IgE/IgG, T-cell lines, and cytokine production (IL-4, IFN-gamma).

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Main Results:

  • Both LNIT and SIT significantly reduced rhinitis symptom scores.
  • LNIT and SIT decreased allergen-specific T-cell proliferation and T-cell line mitogenic index.
  • Reduced IL-4 and IFN-gamma production observed without a clear TH2-TH1 switch.

Conclusions:

  • LNIT and SIT share a common mechanism of inducing T-cell tolerance.
  • T-cell tolerance induction provides a rational explanation for LNIT's clinical success in allergic rhinitis.