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Blockade of Lymphotoxin Signaling Inhibits the Clinical Expression of Murine Graft-versus-Host Skin Disease¹

Qiang Wu^*, Yang-Xin Fu and Richard D. Sontheimer^2,*

^* Department of Dermatology, University of Iowa Roy J. and Lucille A. Carver College of Medicine, University of Iowa Hospitals and Clinics, Iowa City, IA 52242; and Department of Pathology and Committee on Immunology, University of Chicago, Chicago, IL 60637

Adhesion molecules are essential for the recruitment of T cells into the skin during the development of graft-vs-host skin disease (GVHSD). However, the mechanisms responsible for the regulation of expression of cutaneous adhesion molecules in this setting are still poorly understood. In this study we blocked lymphotoxin (LT) signaling in a murine model of minor histocompatibility Ag system mismatch GVHSD by using an LT receptor-Ig fusion protein (LTR-Ig). The recipient mice treated with control human Ig developed clinically apparent, severe skin lesions. However, none of the mice treated with LTR-Ig developed clinical skin disease. The expression of ICAM-1 in cutaneous tissue was also much lower in mice treated with LTR-Ig than in mice treated with human Ig. Thus, the inhibition of LT signaling via LTR-Ig treatment appears to be capable of markedly ameliorating the development of GVHSD, possibly by inhibiting the expression of adhesion molecules.

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