Abstract
To identify new genes related to atopic dermatitis (AD), we screened for differentially expressed genes in peripheral blood eosinophils derived from AD patients and healthy volunteers. RNA was prepared from peripheral blood eosinophils obtained from both AD patients and healthy volunteers, and the expression of various genes was monitored using fluorescent differential display and real-time RT-PCR. One of the expressed sequence tags (ESTs) was expressed at a significantly higher level in AD patients than in healthy volunteers. A full-length cDNA was identified that encoded a human suppressor of cytokine signaling (SOCS) protein, HSOCP-1, also named hASB-8. The expression of HSOCP-1 was increased in cultured peripheral blood eosinophils after IL-4 stimulation, and overexpression of HSOCP-1 caused cell death in an eosinophil cell line, AML14.3D10. p34<sup>SEI-1</sup> was identified as a HSOCP-1-interacting protein by a yeast two-hybrid system. It is a protein that also interacts with the cyclin-dependent kinase inhibitor p16<sup>INK4</sup>, suggesting that HSOCP-1 is involved in cell cycle control and apoptosis.
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