title: T cell-extrinsic CD18 attenuates antigen-dependent CD4+ T cell activation in vivo.
abstract: The β2 integrins (CD11/CD18) are heterodimeric leukocyte adhesion molecules expressed on hematopoietic cells. The role of T cell-intrinsic CD18 in trafficking of naive T cells to secondary lymphoid organs and in Ag-dependent T cell activation in vitro and in vivo has been well defined. However, the T cell-extrinsic role for CD18, including on APC, in contributing to T cell activation in vivo is less well understood. We examined the role for T cell-extrinsic CD18 in the activation of wild-type CD4(+) T cells in vivo through the adoptive transfer of DO11.10 Ag-specific CD4(+) T cells into CD18(-/-) mice. We found that T cell-extrinsic CD18 was required for attenuating OVA-induced T cell proliferation in peripheral lymph nodes (PLN). The increased proliferation of wild-type DO11.10 CD4(+) T cells in CD18(-/-) PLN was associated with a higher percentage of APC, and these APC demonstrated an increased activation profile and increased Ag uptake, in particular in F4/80(+) APC. Depletion of F4/80(+) cells both reduced and equalized Ag-dependent T cell proliferation in CD18(-/-) relative to littermate control PLN, demonstrating that these cells play a critical role in the enhanced T cell proliferation in CD18(-/-) mice. Consistently, CD11b blockade, which is expressed on F4/80(+) macrophages, enhanced the proliferation of DO11.10 CD4(+) T cells in CD18(+/-) PLN. Thus, in contrast to the T cell-intrinsic essential role for CD18 in T cell activation, T cell-extrinsic expression of CD18 attenuates Ag-dependent CD4(+) T cell activation in PLN in vivo.
authors: Department of Internal Medicine, Yale University, New Haven, CT 06510.
authors: Xingxin
authors: X
authors: Wu
authors: Department of Internal Medicine, Yale University, New Haven, CT 06510.
authors: Amit
authors: A
authors: Lahiri
authors: Department of Internal Medicine, Yale University, New Haven, CT 06510.
authors: Ritu
authors: R
authors: Sarin
authors: Department of Internal Medicine, Yale University, New Haven, CT 06510 clara.abraham@yale.edu.
authors: Clara
authors: C
authors: Abraham
mesh_terms: D000818:Animals; D018821:CD18 Antigens / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D020297:Mice, Congenic; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout
chemical_list: D018821:CD18 Antigens