Interleukin (IL)-12-driven primary hypothyroidism: The contrasting roles of two Th1 cytokines (IL-12 and interferon-γ)

Hiroaki Kimura, Shey Cherng Tzou, Roberto Rocchi, Miho Kimura, Koichi Suzuki, Albert F. Parlow, Noel R. Rose, Patrizio Caturegli

Research output: Contribution to journalArticle

Abstract

IL-12, a prototypic T helper 1 cytokine, has been implicated in the pathogenesis of organ-specific autoimmune diseases, such as Hashimoto's thyroiditis, but reported to give conflicting results in murine models of lymphocytic thyroiditis. To determine the effects of chronic, local production of IL-12 within the thyroid gland, we created transgenic mice that express IL-12 p70 under the transcriptional control of the thyroglobulin promoter. Transgenics developed growth retardation, moderate primary hypothyroidism, and mild lymphocytic infiltration of the thyroid gland. The hypothyroidism was associated with increased mRNA levels of the sodium-iodide symporter, an increase partly due to a direct effect of IL-12 on the thyrocyte. Upon immunization with a suboptimal dose of mouse thyroglobulin, IL-12 transgenic mice developed a lymphocytic thyroiditis that was more frequent and severe than that observed in wild-type littermates. The disease-promoting effect of IL-12 was independent of interferon-γ, as shown by the similar interferon-γ levels in transgenics and controls. These findings highlight the contrasting roles of two T helper 1 cytokines and report a novel role of IL-12 on thyroid hormonogenesis.

Original languageEnglish (US)
Pages (from-to)3642-3651
Number of pages10
JournalEndocrinology
Volume146
Issue number8
DOIs
StatePublished - Aug 1 2005

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ASJC Scopus subject areas

  • Endocrinology

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