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Since the expression of vascular cell adhesion molecule-1 (VCAM-1) on endothelial cells plays a central part in the selective recruitment of eosinophils into allergic inflammatory lesions, VCAM-1 may be a key molecule in allergic inflammatory diseases. Soluble forms of VCAM-1 (sVCAM-1) have recently been identified in the circulation, but there is limited published information on levels of sVCAM-1 in the circulation. If the levels of sVCAM-1 vary between patients with allergic diseases and normal controls, this variance would be very useful to investigate the state of the allergic disease and underlying inflammation. This study investigated the serum sVCAM-1 level in patients with perennial allergic rhinitis (rhinitis group) in comparison with non-atopic healthy volunteers (control group). No significant difference in the serum sVCAM-1 level was seen between the two groups (p = 0.4342). However, the serum sVCAM-1 levels in the severe rhinitis group were significantly higher than those in both the control group (p = 0.0067) and the mild rhinitis group (p = 0.0015), whereas no significant difference was observed between the mild rhinitis group and the control group (p = 0.1113). In addition, the serum levels of sVCAM-1 were significantly correlated with the nasal symptoms in the rhinitis group (rs = 0.486, p < 0.0001). In conclusion, serum concentrations of sVCAM-1 are increased in patients with severe perennial allergic rhinitis, and measurement of sVCAM-1 concentrations in sera is likely to be a useful tool for investigation of the severity of allergic rhinitis and underlying inflammatory reactions.
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