Enhancement of interleukin-4 production in activated CD4+ T cells by diphthalate plasticizers via increased NF-AT binding activity

Mi Hyun Lee, Jin Park, Su Wol Chung, Bok Yun Kang, Seung Hyun Kim, Tae Sung Kim

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Background: Diethylhexyl phthalate (DEHP) and diisononyl phthalate (DINP), two commonly used plasticizers in flexible polyvinylchloride formulations, have potentially adverse effects on human health. However, the influence of these diphthalates on allergic responses remains unclear. In this study we examined the effects of DEHP and DINP on IL-4 production in CD4+ T cells and the level of IgE in sera, critical hallmarks associated with allergic diseases. Methods: Mouse T cells were exposed to two diphthalates in vitro and in vivo. The levels of IL-4 and IgE were determined by ELISA, and the degree of NF-AT activation was determined by IL-4 gene promoter assay and electrophoretic mobility shift assay. Results and Discussion: Both DEHP and DINP significantly enhanced IL-4 production in activated CD4+ T cells in a concentration-dependent manner. Treatment with DEHP or DINP in vivo resulted in a significant increase of IL-4 production in CD4+ T cells and of IgE levels in sera. Furthermore, DEHP and DINP enhanced the activation of IL-4 gene promoter in EL4 T cells and the enhancing effect mapped to a region in the IL-4 promoter containing binding sites for a transcription factor, NF-AT. The activation of T cells resulted in markedly enhanced binding activities to the NF-AT site, which significantly increased upon addition of DEHP or DINP, indicating that NF-AT was involved in the enhancing effect of DEHP and DINP on IL-4 production. These findings suggest that both DEHP and DINP enhance allergic responses by enhancement of IL-4 production in CD4+ T cells via stimulation of NF-AT-binding activity.

Original languageEnglish
Pages (from-to)213-222
Number of pages10
JournalInternational Archives of Allergy and Immunology
Volume134
Issue number3
DOIs
Publication statusPublished - 2004 Jul 6
Externally publishedYes

Keywords

  • Allergy
  • Interleukin-4
  • NF-AT
  • Phthalates
  • Plasticizer

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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