Project description:Comparison of follicular dendritic cell-enriched versus -depleted splenocytes. Affinity maturation and Ab class switches occur in lymphoid germinal centers (GCs), in which differentiation and maintenance depend on lymphotoxin (LT) signaling and include differentiation of follicular dendritic cells (FDCs). The events leading to FDC and GC maturation are poorly defined. Using several approaches of functional genomics, we enumerated transcripts affected in mice by suppressing LT receptor (LTR) signaling and/or overrepresented in FDC-enriched GC isolates. Protein expression analysis of 3 of 12 genes both enriched in FDCs and down-regulated by LTR signaling suppression validated them as FDC markers. Functional analysis of one of these three, clusterin, suggests a role as an FDC-derived trophic factor for GC B cells. Hence, the set of genes presented in this study includes markers emanating from LTR signaling and transcripts relevant to GC and FDC function.
Project description:We observed that follicular dendritic cell line induced a new type of CD11b+ myeloid cells (FDMCs) when cultured with a lineage-negative c-kit+ population from mouse spleen cells. Thus, we used microarrays to characterize gene expression of FDMCs.
Project description:Follicular Lymphoma primary cells (FL) were treated with the PI3K delta inhibitor idelalisib (500nM, 48h) in the presence or absence of follicular dendritic cells We used microarrays to uncover the mechanisms underlying mechanism of resistance and sensitivity of FL to idelalisib
Project description:We observed that follicular dendritic cell line induced a new type of CD11b+ myeloid cells (FDMCs) when cultured with a lineage-negative c-kit+ population from mouse spleen cells. Thus, we used microarrays to characterize gene expression of FDMCs. FDMCs were induced on FDC line for RNA extraction and hybridization on Affymetrix microarrays. Microarray data of "FDC-induced myeloid cells (FDMCs)" sample were combined with a large collection of other cell- and tissue-specific gene expression data sets (total: 205 individual data sets). Raw data (.cel) files were normalized using Robust Multichip Analysis (RMA Express; http://rmaexpress.bmbolstad.com/), annotated using the latest libraries available from Affymetrix, and arranged according to cell-type grouping.