Raised plasma adrenomedullin level in Behçet's disease patients

To investigate the role of plasma adrenomedullin (AM) in the pathogenesis of Behcet's disease (BD) patients with inactive ocular complications or ocular attack, 18 consecutive BD patients with ocular complications, including 1 BD patient with ocular attack, another group of 6 BD patients with ocular attack, and 10 normal volunteers were evaluated. All BD patients were regularly followed at ophthalmic outpatient clinics. Levels of both total and mature AM in plasma were measured by immunoradiometric assay. Plasma levels of endothelin-1 (ET-1) were also measured by radioimmunoassay. We also measured the levels of C-reactive protein (CRP) in plasma. Levels of total AM in plasma (mean ± SD, 19.6 ± 6.9 fmol/l) were significantly higher in BD patients than in normal volunteers (14.5 ± 3.6 fmol/l) (P = 0.01). The levels of mature AM were also higher in BD patients (1.6 ± 0.4 fmol/l) than in normal volunteers (0.3 ± 0.6 fmol/l) (P = 0.002). The levels of AM in patients with ocular attack were higher than those in normal volunteers, although there was no significant difference compared to levels of AM in BD patients without ocular attack. AM may play an important role as an antiinflammation factor or may reflect endothelial damage as a marker of disease activity in BD patients.