Kinetic analysis of the response to anti-CD3 in conventional and regulatory CD4+ T cells, in mice and in vitro.

ABSTRACT: Several clinical trials have shown anti-CD3 treatment to be a promising therapy for autoimmune diabetes, but its mechanism of action remains unclear. Foxp3+ regulatory T (Treg) cells are likely to be involved, and we have shown a strong effect of anti-CD3 on homeostatic control of CD4+ FoxP3+ regulatory T (Treg) cells. To analyze the early consequences of anti-CD3 treatment, we sorted and profiled Treg and conventional CD4+ T (Tconv) cells in the first hours and days after anti-CD3 treatment of NOD mice. In practice, NOD mice carrying the Foxp3-GFP reporter were treated with anti-CD3 mAb KT3 (50 ug iv) and CD4+ T cells were sorted from pooled spleen and lymph nodes after 2, 8, 24 and 72 hrs, separating Treg and Tconv cells on the basis of GFP expression. Anti-CD3 treatment led to a transient transcriptional response, terminating faster than most antigen-induced responses. Most transcripts were similarly induced in Treg and Tconv cells, but several were differential, in particular those encoding the IL7 receptor (IL7R) and transcription factors Id2/3 and Gfi1, upregulated in Treg but repressed in Tconv cells. In parallel experiments, we tested the effect of soluble anti-CD3 added to cultures of fresh splenocytes, sorting Treg and Tconv cells at the same time points. Many of the anti-CD3 elicited changes, and of the differential response observed in vivo, were also observed in vitro. Two independent replicate series; Treg and Tconv samples abbreviated TR and TC, respectively. Keywords: Transcriptional activation, TCR All gene expression profiles were obtained from highly purified T cell populations sorted by flow cytometry. RNA from 5 x 104 cells was amplified, labeled, and hybridized to Affymetrix ST1.0 Gene arrays. Raw data were preprocessed with the RMA algorithm in GenePattern, and averaged expression values were used for analysis.

ORGANISM(S): Mus musculus

SUBMITTER: CBDM Lab 

PROVIDER: E-GEOD-48210 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress