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Blood, 15 November 2004, Vol. 104, No. 10, pp. 3205-3213.
Prepublished online as a Blood First Edition Paper on July 27, 2004; DOI 10.1182/blood-2004-03-1184.
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HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY
Mouse CD99 participates in T-cell recruitment into inflamed skin
Gabriele Bixel,
Stephan Kloep,
Stefan Butz,
Björn Petri,
Britta Engelhardt, and
Dietmar Vestweber
From the Max-Planck-Institute of Molecular Biomedicine, Münster, Germany; and the Institute of Cell Biology, Zentrum für Molekularbiologie der Entzuendung (ZMBE), Interdisziplinaeres Zentrum für Klinische Forschung (IZKF), Münster, University of Münster, Münster, Germany.
Human CD99 is a small highly O-glycosylated cell-surface protein expressed on most leukocytes. It was recently found to be expressed at endothelial cell contacts and to participate in the transendothelial migration (TEM) of monocytes in vitro. In order to analyze the physiologic relevance of CD99 in vivo we searched for the mouse homolog. We cloned a mouse cDNA coding for a protein 45% identical in its sequence with human CD99. Based on the cDNA, we generated antibodies against this mouse homolog of CD99, which detected the antigen on most leukocytes, on endothelia of various tissues, and at cell contacts of cultured endothelial cells. Cell aggregation of CD99-transfected Chinese hamster ovary (CHO) cells was completely blocked by anti-CD99 antibodies. The same antibodies inhibited TEM of lymphocytes in vitro, independent of whether T cells or endothelial cells were preincubated with antibodies. In a cutaneous delayed-type hypersensitivity (DTH) reaction, anti-CD99 antibodies inhibited the recruitment of in vivoactivated T cells into inflamed skin as well as edema formation. We conclude that mouse CD99 participates in the TEM of lymphocytes and in their recruitment to inflamed skin in vivo. This establishes CD99 as a valid target for interference with cutaneous inflammatory processes.

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