Differential expression of lymphocyte homing receptors by human memory/effector T cells in pulmonary versus cutaneous immune effector sites

European Journal of Immunology
L J PickerD Y Leung

Abstract

The heterogeneous expression of lymphocyte homing receptors (HR) by the (CD45RA(low)/RO(high)) memory/effector T cell population in the human is thought to define subsets with tissue-selective recirculatory potential. To investigate further the localization characteristics of these T cells, we used multiparameter flow cytometry to quantitate T cell subsets defined by expression of the skin-selective HR called the cutaneous lymphocyte-associated antigen (CLA), the peripheral lymph node (PLN) HR L-selectin, the mucosal-associated HR alpha 4 beta 7-integrin, and the mucosal-associated adhesion molecule alpha e beta 7-integrin in either cutaneous or pulmonary immune effector sites and corresponding peripheral blood. Compared to peripheral blood, skin T cells were highly enriched for the CLA+/L-selectin+/alpha e beta 7-integrin- memory/effector subset, whereas lung memory/effector T cells were predominantly CLA-to low L-selectin-, and almost half were alpha e beta 7-integrin+. alpha 4 beta 7-integrin expressing memory/effector T cells were diminished in both skin and lung, suggesting that this HR is not a major participant in determining localization specificity in either of these sites. The characteristic pulmonary T cell HR phenot...Continue Reading

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