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Systemic and local evidence for complement involvement in chronic spontaneous urticaria.

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Complement activation, indicated by C4d deposition and elevated C5a, plays a role in chronic spontaneous urticaria (CSU) pathogenesis. Omalizumab

Keywords:
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Area of Science:

  • Immunology
  • Dermatology
  • Complement System

Background:

  • The exact pathogenesis of chronic spontaneous urticaria (CSU) and omalizumab's mechanism remain unclear.
  • The rapid clinical response to omalizumab suggests potential involvement of the complement system.
  • This study investigated the role of complement factors in CSU and their relation to omalizumab treatment.

Purpose of the Study:

  • To assess the involvement of complement factors in the pathogenesis of chronic spontaneous urticaria (CSU).
  • To explore the relationship between complement activation and clinical response to omalizumab treatment in CSU patients.

Main Methods:

  • Thirty CSU patients received six administrations of omalizumab (300 mg every 4 weeks).
  • Skin biopsies and peripheral blood samples were collected at baseline and during follow-up.
  • Analysis included complement factors (C1q, C3, C4, C5a) and C4d deposition in skin, correlated with clinical response (Urticaria Activity Score 7).

Main Results:

  • 53% of patients showed C4d deposition in lesional skin blood vessels, suggesting immune complex involvement.
  • Elevated C5a levels in peripheral blood of CSU patients compared to healthy controls were observed (p=0.010).
  • No correlation was found between omalizumab treatment and variations in complement components or their activation.

Conclusions:

  • Complement activation, evidenced by C4d deposition in skin and elevated C5a, is implicated in CSU pathogenesis.
  • Omalizumab's efficacy in CSU appears independent of direct modulation of complement activation.
  • These findings suggest distinct pathways in CSU immunopathogenesis involving complement and omalizumab's action.