Metabolomics,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.

Project description:CONTEXT Slowly progressive chronic tubulo-interstitial damage jeopardizes long-term renal allograft survival. Both immune and non-immune mechanisms are thought to contribute, but the most promising targets for timely intervention have not been identified. OBJECTIVE In the current study we seek to determine the driving force behind progressive histological damage of renal allografts, without the interference of donor pathology, delayed graft function and acute graft rejection. DESIGN We used microarrays to examine whole genome expression profiles in renal allograft protocol biopsies, and analyzed the correlation between gene expression and the histological appearance over time. The gene expression profiles in these protocol biopsies were then compared with gene expression of biopsies with acute T-cell mediated rejection. PATIENTS Human renal allograft biopsies (N=120) were included: 96 rejection-free protocol biopsies and 24 biopsies with T-cell mediated acute rejection. RESULTS In this highly cross-validated study, we demonstrate the significant association of established, ongoing and future chronic histological damage with regulation of adaptive immune gene expression (T-cell and B-cell transcript sets) and innate immune response gene expression (dendritic cell, NK-cell, mast cell and granulocyte transcripts). We demonstrate the ability of gene expression analysis to perform as a quantitative marker for ongoing inflammation with a wide dynamic range: from subtle subhistological inflammation prior to development of chronic damage, over moderate subclinical inflammation associated with chronic histological damage, to marked inflammation of Banff-grade acute T-cell mediated rejection. CONCLUSION Progressive chronic histological damage after kidney transplantation is associated with significant regulation of both innate and adaptive immune responses, months before the histological lesions appear. This study therefore corroborates the hypothesis that quantitative inflammation below the diagnostic threshold of classic T-cell or antibody-mediated rejection is associated with early subclinical stages of progressive renal allograft damage. We used microarrays to examine whole genome expression profiles in renal allograft protocol biopsies, and analyzed the correlation between gene expression and the histological appearance over time. The gene expression profiles in these protocol biopsies were then compared with gene expression of biopsies with acute T-cell mediated rejection. Human renal allograft biopsies (N=120) were included: 96 rejection-free protocol biopsies and 24 biopsies with T-cell mediated acute rejection.

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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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