All-trans-retinoic acid induces interleukin-8 via the nuclear factor-κB and p38 mitogen-activated protein kinase pathways in normal human keratinocytes

Xiuju Dai, Kenshi Yamasaki, Yuji Shirakata, Koji Sayama, Koji Hashimoto

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Retinoic acid derivatives have been used successfully for the treatment of various dermatoses, such as psoriasis; however, topical application of these compounds often elicits skin irritation. We hypothesized that this irritation was as a result of the local production of interleukin-8 (IL-8). To test this hypothesis, we investigated whether all-trans-retinoic acid (ATRA) induced IL-8 production in normal human keratinocytes. Stimulation with 10-7 M ATRA enhanced IL-8 mRNA expression and induced IL-8 production. We also studied the intracellular signaling mechanisms of ATRA-induced IL-8 production in keratinocytes. ATRA increased the expression of RelA (p65), RelB, nuclear factor (NF)-κB2 (p52), and NF-κB1 (p50), and elevated the DNA-binding activity of p65 and phosphorylation of inhibitor κB (IκB) α. Introduction of a dominant-negative mutant of IκBα completely abolished ATRA-induced IL-8 production, which indicates that this process is NF-κB-dependent. We also studied the role of the p38 mitogen-activated protein kinase (MAPK) pathway in this phenomenon. ATRA phosphorylated the p38 MAPK, and SB202180 inhibited ATRA-induced IL-8 production, which indicates that the p38 MAPK is also involved in ATRA-induced IL-8 production. In summary, ATRA induces IL-8 production in both NF-κB- and p38 MAPK-dependent manners in normal human keratinocytes.

Original languageEnglish
Pages (from-to)1078-1085
Number of pages8
JournalJournal of Investigative Dermatology
Volume123
Issue number6
DOIs
Publication statusPublished - 2004 Dec
Externally publishedYes

Keywords

  • Chemokine
  • IκBα
  • Retinoid
  • SB202180
  • Skin irritation
  • p65

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology

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