Deficient Contact Hypersensitivity Reaction in CD4−/− Mice Is Because of Impaired Hapten-Specific CD8+ T Cell Functions  Pierre Saint-Mezard, Cyril Chavagnac,

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Deficient Contact Hypersensitivity Reaction in CD4−/− Mice Is Because of Impaired Hapten-Specific CD8+ T Cell Functions  Pierre Saint-Mezard, Cyril Chavagnac, Marc Vocanson, Jeanne Kehren, Aurore Rozières, Sophie Bosset, Marius Ionescu, Bertrand Dubois, Dominique Kaiserlian, Jean-Francois Nicolas, Frédéric Bérard  Journal of Investigative Dermatology  Volume 124, Issue 3, Pages 562-569 (March 2005) DOI: 10.1111/j.0022-202X.2005.23567.x Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 The absence of CD4 molecules or major histocompatibility molecules class II-restricted CD4+ T cells have opposite effects on contact hypersensitivity (CHS) and delayed-type hypersensitivity outcome. (a) Groups of five CD4−/−, CD4+/−, and class II−/− mice were sensitized with KLH (white bars) or left untreated (black bars), and challenged 7 d later on the left footpad. Results are expressed as the mean footpad swelling (μm) at 24 h after challenge. Hatched bars represent the mean footpad swelling of CD8+ T cells depleted sensitized animals. (b) CHS to 2,4-dinitro-fluorobenezene (DNFB) was analyzed in groups of five wild-type C57BL/6 (▴), CD4+/− (▪), CD4−/− (•) or class II−/− (♦). Mice were either sensitized with DNFB or desensitized (not shown) and challenged 5 d later on the left ear. Results are expressed as the mean ear swelling (μm) at different time points after challenge. Results are representative of three independent experiments. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Fluorescence-activated cell sorting (FACS) analysis of lymph node (LN) cells from CD4−/− and CD4+/− mice. Cells were purified from draining LN of 10 CD4+/− or CD4−/− mice, 5 d after the 2,4-dinitro-fluorobenezene sensitization. The percentage of CD8+, CD4+, and CD4-CD8- T cells was analyzed by FACS. Number of cells represents the average number of CD8+ T cells in one draining lymph node. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Hapten-specific T cells responses in CD4−/− and CD4+/− mice. (a) Secondary proliferative responses. Total lymph node (LN) cells (LN), purified CD8+ T cells (8+) and CD8+ T cell-depleted LN cells (8-) were recovered from 2,4-dinitro-fluorobenezene (DNFB)-sensitized CD4−/− (black bars) and CD4+/− mice (white bars) 5 d after sensitization and tested for proliferative responses to hapten-modified (+) or unmodified (-) syngenic spleen cells in a 6 h 3(H) thymidine assay. (b) Contact hypersensitivity response after the adoptive transfer of CD8+ T cells from DNFB-sensitized CD4−/− and CD4+/− mice (five mice per group). CD8+ T cells were recovered from draining LN at days 5 and 10. 106 cells were transferred in the retro-orbital sinus of naive class II−/− recipient mice. Challenge with 0.15% DNFB was performed immediately after transfer. Results are expressed as the mean ear swelling (μm) 48 h after the challenge. Results are representative of three independent experiments. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Detection of CD8 and interferon-γ (IFN-γ) mRNA during the elicitation phase of contact hypersensitivity. (a) CD8 and IFN-γ mRNA expression in situ was analyzed using semi-quantitative RT-PCR: mRNA was obtained from the ears of mice at 9, 18, 24, and 48 h after the challenge. Controls include ears of untreated mice (n.t). (b) Histogram representation of the CD8 and IFN-γ mRNA relative quantities as compared with hypoxanthine phosphoribosyltransferase (HPRT) mRNA as standard. Each band of (a) was analyzed by densitometry and the results expressed as ratios of optical densities to HPRT band. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Interferon-γ (IFN-γ) production by CD8+ T cells. (a) The level of IFN-γ mRNA in total lymph node (LN) cells (tLN cells), in CD8 T cell-depleted LN cells (8- LN cells) and in purified CD8 T cells (8+ cells) was measured by RNase protection assay. Cells were restimulated with coated anti-CD3 monoclonal antibody (mAb) for 4 h before mRNA extraction. (b) Results are expressed as the relative ratio between IFN-γ and GAPDH signals. (c) IFN-γ production by different LN cell subsets restimulated with coated anti-CD3 mAb for 24 h and assessed by ELISA. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Anti-hapten cytotoxic T lymphocytes activity. Specific cytotoxic activity was determined by lysis of hapten-pulsed EL-4 targets in a 4 h 51Cr release assay. Speen cells (a, c, e), or purified T cells (b, d, f), from 2,4-dinitro-fluorobenezene-sensitized CD4−/− (•), CD4+/− (▪), or class II−/− (▴) mice, were restimulated in vitro for 5 d with haptenated CD4+/− (a, b), CD4−/− (c, d), or class II−/− (e, f) spleen antigen-presenting cells. Results are representative of three independent experiments. Journal of Investigative Dermatology 2005 124, 562-569DOI: (10.1111/j.0022-202X.2005.23567.x) Copyright © 2005 The Society for Investigative Dermatology, Inc Terms and Conditions