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Critical Reviews™ in Immunology
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ISSN Print: 1040-8401
ISSN Online: 2162-6472

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Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.v29.i2.10
pages 87-109

Integrin Function in T-Cell Homing to Lymphoid and Nonlymphoid Sites: Getting There and Staying There

Christopher C. DeNucci
Department of Laboratory Medicine and Pathology, Center for Immunology, Masonic Cancer Center, University of Minnesota Medical School, Minneapolis, MN
Jason S. Mitchell
Department of Laboratory Medicine and Pathology, Center for Immunology, Masonic Cancer Center, University of Minnesota Medical School, Minneapolis, MN
Yoji Shimizu
Department of Laboratory Medicine and Pathology, Center for Immunology, Masonic Cancer Center, University of Minnesota Medical School, Minneapolis, MN

ABSTRACT

The continuous recirculation of naive T cells and their subsequent migration to tissue following activation is crucial for maintaining protective immunity against invading pathogens. The preferential targeting of effector and memory T cells to tissue is instructed during priming and mediated by cell surface expressed adhesion receptors such as integrins. Integrins are involved in nearly all aspects of T-cell life, including naive T-cell circulation, activation, and finally effector T-cell trafficking and localization. Recent research has revealed that microenvironmental factors present during T-cell priming result in the specific regulation of adhesion/integrin and chemokine receptor expression. Once antigen-experienced T cells enter tissue, further changes in integrin expression may occur that are critical for T-cell localization, retention, effector function, and survival. This review discusses the function of integrin expression on T cells and the multiple roles integrins play on naive T cells and in directing effector T-cell trafficking to nonlymphoid sites in order to maintain protective adaptive immunity at body barriers.


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