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Notch is active in Langerhans cell histiocytosis and confers pathognomonic features on dendritic cells

Caroline Hutter1, Max Kauer, Ingrid Simonitsch-Klupp

  • 1St Anna Children's Hospital, Department of Pediatrics, Medical University of Vienna, Vienna, Austria. caroline.hutter@stanna.at

Blood
|October 18, 2012
PubMed

Insights

Langerhans cell histiocytosis (LCH) involves unique dendritic cells (DCs). Jagged 2 (JAG2) signaling in DCs drives LCH features, suggesting Notch pathway interference as a potential treatment.

Area of Science:

  • Immunology
  • Cell Biology
  • Dermatology

Background:

  • Langerhans cell histiocytosis (LCH) is characterized by abnormal Langerhans cell-like dendritic cell (DC) accumulation.
  • The precise origin and distinct nature of LCH cells remain incompletely understood.

Purpose of the Study:

  • To elucidate the unique molecular profile of LCH cells.
  • To investigate the role of Notch signaling in LCH pathogenesis.
  • To identify potential therapeutic targets for LCH.

Main Methods:

  • Comparative transcriptomic analysis of LCH cells, various DC subsets, and monocytes.
  • Molecular analysis of Notch ligand and receptor expression in LCH cells.
  • Functional studies using monocyte-derived DCs to assess JAG2 signaling effects.

Main Results:

  • LCH cells possess a unique transcription profile distinct from other DC subsets and epidermal Langerhans cells.
  • LCH cells selectively express Jagged 2 (JAG2) and its cognate receptor, indicating active Notch signaling.
  • JAG2 signaling in DCs induces LCH cell markers and matrix metalloproteinases (MMPs) 1 and 12, implicated in tissue damage.

Conclusions:

  • JAG2-mediated Notch activation confers key phenotypic and functional characteristics to DCs in LCH.
  • Targeting the Notch signaling pathway presents a promising therapeutic strategy for LCH.

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