PMID: 15383575Sep 24, 2004Paper

LFA-1 on CD4+ T cells is required for optimal antigen-dependent activation in vivo

The Journal of Immunology : Official Journal of the American Association of Immunologists
Sravanthi Kandula, Clara Abraham

Abstract

The leukocyte-specific integrin, LFA-1, plays a critical role in trafficking of T cells to both lymphoid and nonlymphoid tissues. However, the role of LFA-1 in T cell activation in vivo has been less well understood. Although there have been reports describing LFA-1-deficient T cell response defects in vivo, due to impaired migration to lymphoid structures and to sites of effector function in the absence of LFA-1, it has been difficult to assess whether T cells also have a specific activation defect in vivo. We examined the role of LFA-1 in CD4(+) T cell activation in vivo by using a system that allows for segregation of the migration and activation defects through the adoptive transfer of LFA-1-deficient (CD18(-/-)) CD4(+) T cells from DO11.10 Ag-specific TCR transgenic mice into wild-type BALB/c mice. We find that in addition to its role in trafficking to peripheral lymph nodes, LFA-1 is required for optimal CD4(+) T cell priming in vivo upon s.c. immunization. CD18(-/-) DO11.10 CD4(+) T cells primed in the lymph nodes demonstrate defects in IL-2 and IFN-gamma production. In addition, recipient mice adoptively transferred with CD18(-/-) DO11.10 CD4(+) T cells demonstrate a defect in OVA-specific IgG2a production after s.c. im...Continue Reading

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