Soluble adhesion molecules in Behcet's disease

Background: Behcet's disease (BD) may lead to blindness in up to 25% of eyes. Soluble (s)ICAM-1 but not sVCAM-1 is associated with relapse in idiopathic uveoretinitis and is reported to be raised in ED patients. We have investigated the levels of sICAM-1 and sVCAM-1 in Palestinian patients with ED and related them to both ocular and systemic disease activity and to immunosuppressive treatment. Methods: A total of 51 patients (43 male, 8 female; mean ages 29.8 & 31.9 yr) were examined at the St John Ophthalmic Hospital during a one year period (135 consultations). Disease activity was determined from history and standard ocular examination. Anterior uveitis, vitritis and retinal vasculitis acted as markers of ocular inflammation. Peripheral venous sICAM-1 and sVCAM-1 levels were determined by standard ELISA. A total of 53 healthy age- and sex-matched clinic staff members acted as controls. Results: sICAM-1 and sVCAM-1 were both significantly lower in patients on systemic immunosuppression than in those off treatment (p<0.001). Among patients off systemic treatment, sICAM was higher in the group with active systemic disease but quiet eyes (p=0.003), but not in those with active ocular disease (p=0.09), compared to controls, sVCAM was not raised in either group. Conclusion: Systemic immunosuppression was associated with reduced sICAM-1 and sVCAM-1, supporting a role for adhesion molecules in the pathogenesis of ED. sICAM-1 levels were raised in association with inflammatory features implicating endothelial activation in active ED. The mean sICAM-1 was higher in active ocular patients than controls, but did not reach statistical significance, emphasising the need for larger studies which include patients with active features of disease but who are off systemic treatment.