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Updated: Aug 27, 2025

Author Spotlight: Developing Parmodulins to Target Protease-Activated Receptors for Inflammation Control
07:13

Author Spotlight: Developing Parmodulins to Target Protease-Activated Receptors for Inflammation Control

Published on: May 24, 2024

599

Protease- and cell type-specific activation of protease-activated receptor 2 in cutaneous inflammation

Maria Isabel Fleischer1,2, Nadine Röhrig1, Verena K Raker2,3

  • 1Department of Dermatology, University Medical Center Mainz, University of Mainz, Mainz, Germany.

Journal of Thrombosis and Haemostasis : JTH
|September 26, 2022
PubMed
Abstract

Insights

Myeloid cells and the tissue factor-coagulation factor Xa-protease-activated receptor 2 (TF-FXa-PAR2) axis are crucial in skin inflammation. Targeting this pathway offers potential therapies for inflammatory skin diseases.

Area of Science:

  • Immunodermatology
  • Molecular mechanisms of skin inflammation
  • Protease-activated receptor signaling

Background:

  • Protease-activated receptor 2 (PAR2) signaling influences skin barrier and inflammation.
  • The specific roles of immune cells and PAR2-activating proteases in skin diseases remain unclear.

Purpose of the Study:

  • To investigate the contribution of PAR2 signaling to skin inflammation using genetic and pharmacological methods.
  • To identify key immune cells and proteases involved in PAR2 activation during skin inflammation.

Main Methods:

  • Analysis of PAR2-expressing myeloid cells in human allergic contact dermatitis (ACD) lesions and a murine contact hypersensitivity (CHS) model.
  • Utilizing cell type-specific PAR2 knockout mice and PAR2 cleavage-insensitive mutants.
  • Employing pharmacological agents to identify PAR2-activating proteases, including tissue factor (TF) and coagulation factor Xa (FXa).

Main Results:

  • Increased PAR2-positive myeloid cells were observed in ACD patients and CHS mouse models.
  • PAR2 deletion in myeloid cells or complete PAR2 insensitivity significantly reduced skin inflammation and T cell responses.
  • TF and FXa were identified as key upstream activators of PAR2 in both induction and effector phases of CHS.
  • FXa-mediated PAR2 activation plays a critical role during the late phase of CHS development.

Conclusions:

  • Myeloid cells are central players in inflammatory skin conditions.
  • The tissue factor-FXa-PAR2 signaling axis is a critical mediator of skin inflammation.
  • This axis represents a promising therapeutic target for inflammatory skin diseases.
Keywords:
allergic contact dermatitiscontact hypersensitivityfactor Xaprotease-activated receptor 2tissue factor

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