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Up regulated expression of fractalkine/CX3CL1 and CX3CR1 in patients with systemic sclerosis

M Hasegawa1, S Sato, T Echigo

  • 1Department of Dermatology, Kanazawa University Graduate School of Medical Science, Kanazawa, Ishikawa 920-8641, Japan. minoruha@derma.m.kanazawa-u.ac.jp

Annals of the Rheumatic Diseases
|December 21, 2004
PubMed

Insights

Systemic sclerosis (SSc) involves increased fractalkine and its receptor CX(3)CR1, driving inflammation and vascular injury in affected tissues. These molecules are key players in SSc pathogenesis.

Area of Science:

  • Immunology
  • Rheumatology
  • Pathophysiology

Background:

  • Fractalkine (CX3CL1) on endothelial cells promotes leukocyte activation and adhesion via its receptor CX(3)CR1.
  • Soluble fractalkine acts as a chemoattractant for leukocytes expressing CX(3)CR1.

Purpose of the Study:

  • Investigate the role of fractalkine and CX(3)CR1 in systemic sclerosis (SSc).
  • Quantify fractalkine and CX(3)CR1 expression levels in SSc patients.

Main Methods:

  • Immunohistochemistry used to assess fractalkine and CX(3)CR1 expression in skin and lung tissues.
  • Enzyme-linked immunosorbent assay (ELISA) measured circulating soluble fractalkine levels.
  • Flow cytometry analyzed CX(3)CR1 expression on blood cells from SSc patients.

Main Results:

  • Elevated CX(3)CR1 on monocytes/macrophages and T cells in diffuse cutaneous SSc.
  • Increased numbers of CX(3)CR1-expressing cells, including monocytes/macrophages, in lesional skin and lungs.
  • Strong fractalkine expression on endothelial cells in affected SSc tissues.
  • Significantly higher soluble fractalkine levels associated with disease severity markers.

Conclusions:

  • Upregulated fractalkine and CX(3)CR1 expression contribute to mononuclear cell recruitment in SSc.
  • This process exacerbates inflammation and vascular injury in affected tissues.
  • Fractalkine and CX(3)CR1 are critical mediators in SSc pathogenesis.
Abstract

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