Molecular events in human T cells treated with diesel exhaust particles or formaldehyde that underlie their diminished interferon-γ and interleukin-10 production

Yoshinori Sasaki, Tomoyuki Ootani, Yumiko Ito, Masato Mizuashi, Satoshi Nakagawa, Toru Furukawa, Akira Horii, Setsuya Aiba

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Background: A series of epidemiological and experimental studies have suggested that diesel exhaust particles (DEP) and formaldehyde (FA) may help trigger T helper type 2 (Th2)-mediated allergic responses. Methods: To identify the molecular events by which DEP and FA induce a Th2-skewed immune response, we stimulated T cells from healthy subjects with anti-CD3/anti-CD28 monoclonal antibodies and examined the effect of pretreatment with DEP or FA on mitogen-activated protein kinases (MAPKs) and nuclear factor (NF)-κB by Western blotting and colorimetric NF-κB assays. We also examined the mRNA expression profiles of the T cells by microarray and real-time PCR analyses. Results:FA selectively suppressed interferon (IFN)-γ and interleukin-10 mRNA expression and protein production in stimulated T cells, as we previously reported with DEP. In the present study, we found that both DEP and FA suppressed NF-κB signaling and activated MAPKs. Both also significantly suppressed the mRNA expression of T-bet, Txk and c-Maf. Microarrays revealed significant augmentation of the expression of 2 FoxO3a-dependent genes, namely glucocorticoid-induced leucine zipper and growth arrest and DNA damage-inducible gene 45α (Gadd45a), which are known to modulate T cell immune responses. Treatment with N-acetylcysteine reversed the augmented Gadd45a mRNA response and caused the suppressed IFN-γ mRNA response to recover. Conclusions:DEP and FA have similar transcriptional and nontranscriptional effects on T cell signaling that together promote a Th2-skewed immune response.

Original languageEnglish
Pages (from-to)239-250
Number of pages12
JournalInternational Archives of Allergy and Immunology
Volume148
Issue number3
DOIs
Publication statusPublished - 2009 Feb 1

Keywords

  • Diesel exhaust particles
  • Formaldehyde
  • Glucocorticoid-induced leucine zipper
  • Growth arrest and DNA damage-inducible gene 45α
  • Human T lymphocytes
  • Interferon-γ
  • Interleukin-10

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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