Unknown,Transcriptomics,Genomics,Proteomics

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Expression data of AI4 CD8 T cells from AI4 and Rip-B7xAI4 mice

ABSTRACT: B7x (B7-H4 or B7S1) is the seventh member of the B7 family and the in vivo function remains largely unknown. Despite new genetic data linking the B7x gene with autoimmune diseases, how exactly it contributes to peripheral tolerance and autoimmunity is unclear. Here we showed that B7x protein was not detected on antigen-presenting cells or T cells in both human and mice, which is unique in the B7 family. As B7x protein is expressed in some peripheral cells such as pancreatic b cells, we utilized a CD8 T cell-mediated diabetes model (AI4ab) in which CD8 T cells recognize an endogenous self-antigen, and found that mice lacking B7x developed more severe diabetes than control AI4ab mice. Conversely, mice overexpressing B7x in the b cells (Rip-B7xAI4ab) were diabetes free. Furthermore, adoptive transfer of effector AI4ab CD8 T cells induced diabetes in control mice, but not in Rip-B7xAI4ab mice. Mechanistic studies revealed that pathogenic effector CD8 T cells were capable of migrating to the pancreas but failed to robustly destroy tissue when encountering local B7x in Rip-B7xAI4ab mice. Although AI4ab CD8 T cells in Rip-B7xAI4ab mice and AI4ab mice showed similar cytotoxic function, cell death, and global gene expression profiles, these cells had greater proliferation in AI4ab mice than in RIP-B7xAI4ab mice. These results suggest that B7x in nonlymphoid organs prevents peripheral autoimmunity partially through inhibiting proliferation of tissue-specific CD8 T cells and that local overexpression of B7x on pancreatic b cells is sufficient to abolish CD8 T cell-induced diabetes. AI4 mice developed T1D and Rip-B7x AI4 mice were resistant to T1D. Total RNA was collected and gene expression compared between AI4 CD8 T cells from AI4 and Rip-B7xAI4 mice.

ORGANISM(S): Mus musculus

SUBMITTER: Juan Lin

PROVIDER: E-GEOD-40225 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Peripheral tolerance induction is critical for the maintenance of self-tolerance and can be mediated by immunoregulatory T cells or by direct induction of T cell anergy or deletion. While the molecular processes underlying anergy have been extensively studied, little is known about the molecular basis for peripheral T cell deletion. Here, we determined the gene expression signature of peripheral CD8+ T cells undergoing deletional tolerance, relative to those undergoing immunogenic priming or lymphopenia-induced proliferation. From these data, we report the first detailed molecular signature of cells undergoing deletion. Consistent with defective cytolysis, these cells exhibited deficiencies in granzyme up-regulation. Furthermore, they showed antigen-driven Bcl-2 down-regulation and early up-regulation of the pro-apoptotic protein Bim, consistent with the requirement of this BH3-only protein for peripheral T cell deletion. Bim up-regulation was paralleled by defective IL-7Ra chain re-expression, suggesting that Bim-dependent death may be triggered by loss of IL-7/IL-7R signaling. Finally, we observed parallels in molecular signatures between deletion and anergy suggesting that these tolerance pathways may not be as molecularly distinct as previously surmised. NaÃ¯ve (CD44lo) OT-I T cells were CFSE labelled and transferred in a model of deletional tolerance (RIP-OVAhi mice), a model of immunity (mice primed with OVA coated splenocytes and LPS) or a model of lymphopenia induced proliferation (Rag-/- mice). 60 hrs (RIP-OVAhi and OVA coated splenocytes) or 5 days (Rag-/-) after transfer, OT-I cells that had undergone two or more divisions as determined by CFSE dilution were sorted, RNA extracted and samples were prepared for hybridisation to Affymetrix microarrays. As a control for naive cells, CFSE labelled OT-I cells were injected into antigen-free B6 mice and the undivided naive cells were sorted after 60 hrs and also used for microarray analysis. Two replicates were prepared for the naive cells, cells from RIP-OVAhi mice and cells from OVA coated splenocyte primed mice, while one replicate was prepared for the cells from Rag-/- mice.

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Expression data of AI4 CD8 T cells from AI4 and Rip-B7xAI4 mice

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