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Autocrine/paracrine TGF-β1 inhibits Langerhans cell migration

Aleh Bobr1, Botond Z Igyarto, Krystal M Haley

  • 1Department of Dermatology, Center for Immunology, University of Minnesota, Minneapolis, MN 55455, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 13, 2012
PubMed

Insights

Transforming growth factor-beta 1 (TGF-β1) directly inhibits Langerhans cell (LC) migration. This discovery in skin-resident dendritic cells (DCs) reveals a new therapeutic target for inflammatory skin diseases.

Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Langerhans cells (LCs) are epidermal dendritic cells (DCs) crucial for skin immunity.
  • Transforming growth factor-beta 1 (TGF-β1) is highly expressed by LCs and regulates immune responses.
  • Investigating the role of LC-derived TGF-β1 is challenging due to its essential role in LC development.

Purpose of the Study:

  • To develop a model for inducible, LC-specific gene deletion to study TGF-β1 function.
  • To elucidate the role of TGF-β1 in regulating LC migration in the skin.

Main Methods:

  • Engineered transgenic huLangerin-CreER(T2) mice for inducible LC-specific gene excision.
  • Generated huLangerin-CreER(T2) × TGF-βRII(fl) and huLangerin-CreER(T2) × TGF-β1(fl) mouse models.
  • Analyzed LC migration, costimulatory marker expression, and cytokine levels post-gene deletion.

Main Results:

  • Inducible deletion of TGF-β receptor II (TGFβRII) or TGF-β1 in LCs triggered significant LC migration to lymph nodes.
  • LC migration occurred without altering costimulatory molecule expression or inflammatory cytokine profiles.
  • Decreased p-SMAD2/3 levels in LCs indicated reduced TGF-β signaling prior to inflammation.

Conclusions:

  • TGF-β1 acts in an autocrine/paracrine manner to inhibit both steady-state and inflammation-induced LC migration.
  • Targeting the TGF-β1 pathway in LCs presents a potential therapeutic strategy for skin diseases.

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