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Extra info for Annual Review of Immunology Volume 23 2005

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Although CD28 is not essential for OX40 expression, engagement of CD28 can enhance the kinetics and level of OX40 expression on T cells (54, 105). OX40 is preferentially expressed on Th2 cells in some models (106, 107), but it can also be expressed on Th1 cells (104, 107, 108) and can play a role in both Th1 and Th2 responses (to be discussed below). In vivo, OX40-expressing CD4 T cells are found in close proximity to antigen-activated B cells in the spleen (107, 109). Whereas OX40 expression appears to be restricted to T cells, OX40L is expressed on a number of cell types.

Van Lier, personal communication). CD27 is also expressed on thymocytes, and anti-CD27 treatment of mice initially suggested a role for CD27 in T cell development (70). However, these effects were not borne out in the CD27−/− mice, which have normal numbers of mature and immature T cells (71). CD70 is found on activated T cells, B cells, and DCs (16, 72–75). CD70 is induced on mouse B cells and DC by anti-CD40 or LPS and on DC by GMCSF (18). CD70 is also expressed on activated T cells but at lower levels than on activated B cells (18).

This reciprocal expression of HVEM and LIGHT on T cells (242) and the downregulation of LIGHT upon DC maturation (243) means that there is only a narrow window of time in the first few hours after initial T cell activation in which HVEMLIGHT interactions can occur. sgm LaTeX2e(2002/01/18) P1: IKH TNF FAMILY MEMBERS AS COSTIMULATORS 41 posttransplant in cardiac allografts, suggesting that in vivo both receptors and ligands can be simultaneously expressed (245). Annu. Rev. Immunol. 23:23-68. org by HINARI on 08/26/07.

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