{"owner": "ArrayExpress Uploader", "pop_total": 0, "species": "mouse", "factors": [{"GSM534250 1": {}}, {"GSM534251 1": {}}, {"GSM534252 1": {}}, {"GSM534253 1": {}}, {"GSM534254 1": {}}, {"GSM534255 1": {}}, {"GSM534256 1": {}}], "id": 6047, "ownerprofile_id": "arrayexpress_sid", "platform": 6, "summary_wrapped": "CD4 T cell help is critical for both the generation and maintenance of germinal centers, and T follicular helper (TFH) cells are the CD4...", "geo_gse_id": "E-GEOD-21380", "owner_profile": "/profile/8773/arrayexpressuploader", "factor_count": 0, "sample_count": 7, "tags": ["cell", "surface", "viral infection"], "lastmodified": "Dec.12, 2014", "is_default": false, "geo_gds_id": "", "slug": "expression-data-from-in-vivo-tfh-vs-gc-tfh-vs-non", "geo_id_plat": "E-GEOD-21380_A-AFFY-45", "name": "Expression Data from in vivo Tfh vs GC Tfh vs non-Tfh", "created": "Nov.11, 2014", "summary": "CD4 T cell help is critical for both the generation and maintenance of germinal centers, and T follicular helper (TFH) cells are the CD4 T cell subset required for this process. SAP (SH2D1A) expression in CD4 T cells is essential for germinal center development. However, SAP-deficient mice have only a moderate defect in TFH differentiation as defined by common TFH surface markers. CXCR5+ TFH cells are found within the germinal center as well as along the boundary regions of T/B cell zones. Here we show that germinal center associated T cells (GC TFH) can be identified by their co-expression of CXCR5 and the GL7 epitope, allowing for phenotypic and functional analysis of TFH and GC TFH populations. Here we show GC TFH are a functionally discrete subset of further polarized TFH cells, with enhanced B cell help capacity and a specialized ability to produce IL-4 in a TH2-independent manner. Strikingly, SAP-deficient mice have an absence of the GC TFH subset and SAP- TFH are defective in IL-4 and IL-21 production. We further demonstrate that SLAM (Slamf1, CD150), a surface receptor that utilizes SAP signaling, is specifically required for IL-4 production by GC TFH. GC TFH cells require IL-4 and IL-21 production for optimal help to B cells. These data illustrate complexities of SAP-dependent SLAM family receptor signaling, revealing a prominent role for SLAM receptor ligation in IL-4 production by germinal center CD4 T cells but not in TFH and GC TFH differentiation. Analysis of in vivo polyclonal GC Tfh vs Tfh vs Non-Tfh eight days after LCMV viral infection. Analysis of in vivo follicular helper CD4 T cells (CXCR5high GL7low), versus germinal center follicular helper CD4 T cells (CXCR5hi GL7hi), versus non-follicular helper CD4 T cells (CXCR5low) eight days after viral infection.", "source": "http://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-21380", "sample_source": "http://www.ebi.ac.uk/arrayexpress/experiments/E-GEOD-21380/samples/"}