Unknown,Transcriptomics,Genomics,Proteomics

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Activating CD8 T cell clones via the T cell receptor complex in the absence and presence of cyclosporine A

ABSTRACT: Comparison of a cyclosporine-resistant murine CD8 T cell clone to a cyclosporine-sensitive murine T cell clone during activation (CSA = Cyclosporine A) Chronic allograft rejection is the leading cause of morbidity/mortality in solid organ and bone marrow transplant patients. It occurs in the setting of potent calcineurin and mTOR inhibitor therapies, implying that T cells mediating chronic rejection can function with compromised calcineurin-NFAT or IL-2 receptor signaling pathways. In murine models the T cells mediating allograft rejection in the setting of calcineurin inhibitor therapy are CD8 T cells making IFN-gamma without a requirement for perforin. It is not known whether these pathologic T cells are a unique subset or how they function. In parallel other animal model research has shown that alloepthelial cells residing in the donor organ are critical targets for rejection. While investigating T cell-alloepithelial cell interactions, we discovered an unusual alloreactive CD8 T cell population that recognized MHC class II I-Abm12. A CD8 T cell clone derived from that population was intrinsically-resistant to cyclosporine and rapamycin without prior exposure to either in vivo or in vitro. Microarray analysis comparing the novel CD8 T cell clone to a conventional CD8 CTL clone specific for MHC class I Kbm1 suggested that the TCR signaling pathway responsible for cyclosporine-resistance utilized the Aryl Hydrocarbon Receptor (AHR). Two T cell clones x 2 experimental conditions x 4 replicates

ORGANISM(S): Mus musculus

SUBMITTER: Raymond Johnson

PROVIDER: E-GEOD-46122 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Background: Despite significant improvements in short-term kidney transplant survival, comparable increases in 5 and 10-year outcomes have not been achieved. Chronic allograft nephropathy (CAN) is a major cause of late graft loss. Toxic nephropathy and inadequate long-term immunosuppression are possible factors. We performed a randomized prospective trial comparing calcineurin inhibitor (CNI)-free to CNI-based immunosuppression to determine the impact on renal function, structure, and gene expression. Methods: Sixty-one kidney recipients received mycophenolate mofetil (MMF), and prednisone (P). Randomized patients received concentration-controlled sirolimus or cyclosporine. Two years post-transplant 55 patients underwent renal function studies, 48 (87%) underwent transplant biopsies; all classified by Banff scoring and 41 by DNA microarrays. Findings: Comparing sirolimus/MMF/P to cyclosporine/MMF/P at two years, there was a significantly lower serum creatinine (1.35 vs. 1.81 mg/dl; p=0.008), significantly higher Cockroft-Gault glomerular filtration rate (GFR) (80.4 vs. 63.4 cc/min; p=0.008), iothalamate GFR (60.6 vs. 49.2 cc/min; p= 0.018), and Banff 0 (normal) biopsies (66.6 vs. 20.8%; p=0.013). Regression analysis of calculated GFR’s from 1 to 36 months yielded a positive slope for sirolimus of 3.36 ml/min/year, and a negative slope for cyclosporine of –1.58 ml/min/year (p=0.008). Gene expression profiles of kidney biopsies with higher Banff CAN scores confirmed significant up regulation of genes responsible for immune/inflammation and fibrosis/tissue remodeling. Interpretation: At two years the sirolimus-treated patients have better renal transplant function, a diminished prevalence of CAN, and down regulated expression of genes responsible for the progression of CAN. All may provide for an alternative natural history with improved graft survival. Keywords = Cyclosporine Keywords = Sirolimus Keywords = Transplantation Keywords = DNA microarrays Keywords = calcineurin inhibitors Keywords: parallel sample. This dataset is part of the TransQST collection.

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Activating CD8 T cell clones via the T cell receptor complex in the absence and presence of cyclosporine A

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