CC chemokine receptor (CCR) 4 and the CCR10 ligand cutaneous T cell–attracting chemokine (CTACK) in lymphocyte trafficking to inflamed skin

Y Reiss, AE Proudfoot, CA Power… - The Journal of …, 2001 - rupress.org
Y Reiss, AE Proudfoot, CA Power, JJ Campbell, EC Butcher
The Journal of experimental medicine, 2001rupress.org
The chemokine thymus and activation-regulated chemokine (TARC; CCL17) is displayed by
cutaneous (but not intestinal) venules, and is thought to trigger vascular arrest of circulating
skin homing memory T cells, which uniformly express the TARC receptor CC chemokine
receptor (CCR) 4. Cutaneous T cell–attracting chemokine (CTACK; CCL27), expressed by
skin keratinocytes, also attracts cutaneous memory T cells, and is hypothesized to assist in
lymphocyte recruitment to skin as well. Here we show that chronic cutaneous inflammation …
The chemokine thymus and activation-regulated chemokine (TARC; CCL17) is displayed by cutaneous (but not intestinal) venules, and is thought to trigger vascular arrest of circulating skin homing memory T cells, which uniformly express the TARC receptor CC chemokine receptor (CCR)4. Cutaneous T cell–attracting chemokine (CTACK; CCL27), expressed by skin keratinocytes, also attracts cutaneous memory T cells, and is hypothesized to assist in lymphocyte recruitment to skin as well. Here we show that chronic cutaneous inflammation induces CD4 T cells expressing E-selectin binding activity (a marker of skin homing memory cells) in draining lymph node, and that these E-selectin ligand+ T cells migrate efficiently to TARC and to CTACK. In 24 h in vivo homing assays, stimulated lymph node T cells from wild-type mice or, surprisingly, from CCR4-deficient donors migrate efficiently to inflamed skin; and an inhibitory anti-CTACK antibody has no effect on wild-type lymphocyte recruitment. However, inhibition with anti-CTACK monoclonal antibody abrogates skin recruitment of CCR4-deficient T cells. We conclude that CTACK and CCR4 can both support homing of T cells to skin, and that either one or the other is required for lymphocyte recruitment in cutaneous delayed type hypersensitivity.
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