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EphB2 Receptor Promotes Dermal Fibrosis in Systemic Sclerosis.

Erika S A Egal1, Severin Donald Kamdem1, Masaaki Yoshigi1

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EphB2 receptor tyrosine kinase signaling drives dermal fibrosis in systemic sclerosis (SSc). Targeting EphB2 may offer a new therapeutic strategy for SSc patients.

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Area of Science:

  • Dermatology
  • Molecular Biology
  • Cell Signaling

Background:

  • Erythropoietin-producing hepatocellular (Eph)/Ephrin cell-cell signaling is implicated in fibrogenesis.
  • Dermal fibrosis is a key feature of systemic sclerosis (SSc).

Purpose of the Study:

  • To investigate the role of EphB2 receptor tyrosine kinase in mediating dermal fibrosis in SSc.
  • To test if EphB2 is a therapeutic target for SSc.

Main Methods:

  • Assessed EphB2 expression in human SSc skin and fibroblasts.
  • Utilized EphB2-knockout, kinase-dead, and overactive mutant mice in bleomycin and Tsk1/+ fibrosis models.
  • Conducted in vitro studies on SSc fibroblasts and in vivo studies on fibroblast-specific Ephb2-deficient mice.

Main Results:

  • EphB2 expression is upregulated in SSc skin and fibroblasts, and in animal models of fibrosis.
  • EphB2 signaling drives dermal fibrosis in mouse models.
  • Transforming growth factor-β (TGF-β) upregulates EphB2 in fibroblasts, and EphB2 inhibition reduces TGF-β-induced differentiation and fibrosis.

Conclusions:

  • TGF-β-mediated EphB2 overexpression and signaling are critical in SSc dermal fibrosis.
  • EphB2 is a potential therapeutic target for SSc.