Abstract
The presence of eosinophils and eosinophil cationic protein (ECP) in the involved and non-involved skin in patients with psoriasis was studied using a polyclonal antibody specific for ECP and a monoclonal antibody (EG2) specific for activated eosinophils and secreted ECP. ECP immunoreactive eosinophils were found in all the specimens from involved psoriatic skin. In new lesions in patients with rapidly progressive disease, intense ECP immunoreactivity was detected both intra- and extracellularly, particularly in the upper third of the epidermis and usually in association with granulocytes. In stable or slowly progressive lesions, less ECP was observed. The EG2-immunoreactivity was positive in the same areas. ECP was also determined in suction-blister fluid from lesional and non-involved skin in psoriasis patients and in healthy subjects. The ECP concentration was greatly elevated in the fluid from lesions in patients with more acute and progressive disease.
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