Innate and acquired immune system in patients developing interferon-α-related autoimmune thyroiditis: A prospective study

G. Mazziotti, F. Sorvillo, M. Piscopo, F. Morisco, M. Cioffi, G. Stornaiuolo, G. B. Gaeta, A. M. Molinari, J. H. Lazarus, G. Amato, C. Carella

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: In this prospective study, we investigated whether the development of interferon (IFN)-α-related autoimmune thyroiditis (IFN-AT) was correlated with the sequential changes of cytokine pattern induced by IFNα in the peripheral lymphocytes. Patients and Methods: We enrolled 18 hepatitis C virus (HCV)-positive patients who developed IFN-AT, eight patients with euthyroidism [IFN-AT(Eu)] and 10 with thyroid dysfunction [IFN-AT(Dy)]. Twenty HCV-positive patients without IFN-AT acted as control group (Co-HCV+). Intracellular expression of IFNγ and IL-4 was evaluated by multicolor flow-cytometry analysis in peripheral lymphocytes in vitro stimulated by phorbol-12-myristate-13-acetate (PMA) (25 ng/ml) and ionomycin (1 μg/ml) in presence of monensin (5 μM). Results: At the appearance of thyroid disease, both IFN-AT(Eu) and IFN-AT(Dy) patients showed a significant increase of IFNγ expression in CD3+CD56+ and CD3-CD56+ cells but not in CD4+ and CD8+ cells. At this time point, IFN-AT(Eu) but not IFN-AT(Dy) patients also showed an increase of IL-4 expression in CD3+CD56+ cells and CD4+ cells. Six months later, IFN-AT(Eu) patients maintained high expression of IL-4 in CD4+ and CD3+CD56+ cells without any further increase in IFNγ expression. By contrast, IFN-AT(Dy) patients showed an increase of IFNγ expression in CD4+ and CD8+ cells, with a concomitant decrease of IL-4 expression in CD4+ cells. Conclusions: Type 2 immune response is activated early and specifically in patients with IFN-AT who remain euthyroid throughout the follow-up. Predominant in patients developing thyroid dysfunction, by contrast, is the type 1 immune response that seems to occur earlier in innate than acquired immune system.

Original languageEnglish
Pages (from-to)4138-4144
Number of pages7
JournalJournal of Clinical Endocrinology and Metabolism
Volume90
Issue number7
DOIs
Publication statusPublished - Jul 2005

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology, Diabetes and Metabolism

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