Chronic spontaneous urticaria: Evidence of systemic microcirculatory changes

Area of Science:

• Dermatology
• Vascular Biology
• Immunology

Background:

• Chronic spontaneous urticaria (CSU) is a skin condition involving endothelial cell activation, leading to local vascular changes.
• Systemic symptoms in CSU suggest potential involvement of broader microcirculatory alterations.
• Understanding these changes is crucial for managing disease duration and systemic manifestations.

Purpose of the Study:

• To investigate systemic microcirculatory differences in patients with CSU compared to healthy controls.
• To assess the relationship between CSU, endothelial cell biomarkers, and microcirculatory parameters.

Main Methods:

• Nailfold videocapillaroscopy (NVC) was used to evaluate microcirculation in 49 CSU patients and 44 healthy controls.
• Serum levels of vascular endothelial growth factor (VEGF), soluble E-selectin, and stem cell factor (SCF) were measured.
• Clinical characteristics and autoimmune markers of CSU were assessed.

Main Results:

• CSU patients exhibited significantly lower capillary density and more capillary abnormalities (malformations, dilations) on NVC compared to controls.
• Serum levels of VEGF, soluble E-selectin, and SCF did not differ between CSU patients and controls.
• Higher VEGF levels correlated with more abnormal capillaries in CSU patients.
• Autoimmune markers (low IgE, high anti-TPO) were associated with increased capillary density and fewer dilations.

Conclusions:

• CSU is associated with systemic microcirculatory changes, particularly in capillary structure.
• Vascular endothelial growth factor (VEGF) may contribute to the observed microvascular alterations in CSU.
• Further research into these systemic changes could inform CSU management.