Leukocyte accumulation in graft blood vessels during self-limiting acute rejection of rat kidneys Immunobiology
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ABSTRACT:
ORGANISM(S): Rattus norvegicus
PROVIDER: GSE18266 | GEO | 2010/09/24
SECONDARY ACCESSION(S): PRJNA117935
REPOSITORIES: GEO
Similar Datasets
Project description:Acute rejection episodes trigger chronic renal allograft vasculopathy. Numerous leukocytes, predominantly monocytes, accumulate in graft blood vessels during reversible acute rejection preceding chronic rejection of rat kidneys. We speculate that they contribute to transplant vasculopathy and set out to characterize them. Allogeneic renal transplantation was performed in the Fischer 344 to Lewis rat strain combination, Lewis isografts served as controls. Leukocytes were harvested by intensive perfusion of graft blood vessels and subjected to flow cytometry, quantitative RT-PCR and genome-wide transcriptional profiling. Kidneys of LEW and F344 rats were transplanted in LEW rats. Five biological replicates were performed for both isogenic and allogenic transplantation. Transcriptomes of allogenics were compared to isogenics on 5 dual-color hybridizations.
2010-09-24 | E-GEOD-18266 | biostudies-arrayexpress
Project description:Objective: Apolipoprotein E (Apo E) is a multifunctional protein, originally described in the context of lipoprotein metabolism and cardiovascular disease. More recently, anti-inflammatory functions of ApoE have been documented. ApoE was studied in the context of several inflammatory disorders, but its role in the pathogenesis of acute organ rejection is unknown. In this study, we test the hypothesis that ApoE attenuates acute renal allograft rejection. Materials and methods: The Dark Agouti (DA) to Lewis (Lew) and the Brown Norway (BN) to Lew rat strain combinations were used to investigate fatal acute rejection. In addition, Fischer 344 (F344) kidneys were transplanted to Lew rats to study reversible acute rejection. Isograft recipients and untreated Lew rats were used as controls. ApoE mRNA expression was quantified in intravascular leukocytes accumulating in the blood vessels of renal grafts and in graft tissue. Apo E protein levels were assessed in blood plasma. To test the protective potential of ApoE, recipients of BN kidneys were treated with ApoE-mimetic peptide. Results: Intravascular graft leukocytes and renal tissue obtained from animals undergoing reversible acute rejection expressed increased levels of ApoE mRNA, whereas during fatal rejection, ApoE expression remained unchanged in the BN to Lew rat strain combination or was significantly reduced when DA rats were used as donors of the kidney. On the protein level, no changes in ApoE were seen in plasma. However, we do not know if local leukocytic ApoE expression results in increased ApoE concentrations inside graft blood vessels. Peptide treatment of allograft recipients reversed fatal rejection and significantly improved animal survival. Conclusions: ApoE plays a protective role in acute organ rejection. Further studies are needed to understand the exact mechanism how ApoE reverses acute rejection. dual-color balanced dye-swap design with 4 biological replicates, hybridized on 4 arrays
2016-06-01 | E-GEOD-58156 | biostudies-arrayexpress
Project description:Transcriptome analyses of organ transplants have until now usually focused on whole tissue samples containing activation profiles from different cell populations. Here, we enriched endothelial cells from rat cardiac allografts and isografts, establishing their activation profile at baseline and on day 2, 3 and 4 after transplantation. Modulated transcripts were assigned to three categories based on their regulation profile in allografts and isografts. Categories A and B contained the majority of transcripts and showed similar regulation in both graft types, appearing to represent responses to surgical trauma. By contrast, category C contained transcripts that were partly allograft-specific and to a large extent associated with interferon-ï§-responsiveness. Several transcripts were verified by immunohistochemical analysis of graft lesions, among them the matricellular protein periostin which was one of the most highly upregulated transcripts but has not been associated with transplantation previously. In conclusion, the majority of the differentially expressed genes in graft endothelial cells are affected by the transplantation procedure whereas relatively few are associated with allograft rejection. Endothelial cells were enriched from control/non-transplanted hearts and from allografts (DA to Lewis) and isografts (Lewis to Lewis) harvested at day 2, 3 and 4 after transplantation. Three biological replicates from each time point and graft type were analyzed (a total of 24 arrays). Leukocytes were enriched from allografts at day 2 (n=1), day 3 (n=2) and day 4 (n=1) after transplantation.
2010-07-29 | E-GEOD-16695 | biostudies-arrayexpress
Project description:Objective: Apolipoprotein E (Apo E) is a multifunctional protein, originally described in the context of lipoprotein metabolism and cardiovascular disease. More recently, anti-inflammatory functions of ApoE have been documented. ApoE was studied in the context of several inflammatory disorders, but its role in the pathogenesis of acute organ rejection is unknown. In this study, we test the hypothesis that ApoE attenuates acute renal allograft rejection. Materials and methods: The Dark Agouti (DA) to Lewis (Lew) and the Brown Norway (BN) to Lew rat strain combinations were used to investigate fatal acute rejection. In addition, Fischer 344 (F344) kidneys were transplanted to Lew rats to study reversible acute rejection. Isograft recipients and untreated Lew rats were used as controls. ApoE mRNA expression was quantified in intravascular leukocytes accumulating in the blood vessels of renal grafts and in graft tissue. Apo E protein levels were assessed in blood plasma. To test the protective potential of ApoE, recipients of BN kidneys were treated with ApoE-mimetic peptide. Results: Intravascular graft leukocytes and renal tissue obtained from animals undergoing reversible acute rejection expressed increased levels of ApoE mRNA, whereas during fatal rejection, ApoE expression remained unchanged in the BN to Lew rat strain combination or was significantly reduced when DA rats were used as donors of the kidney. On the protein level, no changes in ApoE were seen in plasma. However, we do not know if local leukocytic ApoE expression results in increased ApoE concentrations inside graft blood vessels. Peptide treatment of allograft recipients reversed fatal rejection and significantly improved animal survival. Conclusions: ApoE plays a protective role in acute organ rejection. Further studies are needed to understand the exact mechanism how ApoE reverses acute rejection.
2016-06-01 | GSE58156 | GEO
Project description:Transcriptome analyses of organ transplants have until now usually focused on whole tissue samples containing activation profiles from different cell populations. Here, we enriched endothelial cells from rat cardiac allografts and isografts, establishing their activation profile at baseline and on day 2, 3 and 4 after transplantation. Modulated transcripts were assigned to three categories based on their regulation profile in allografts and isografts. Categories A and B contained the majority of transcripts and showed similar regulation in both graft types, appearing to represent responses to surgical trauma. By contrast, category C contained transcripts that were partly allograft-specific and to a large extent associated with interferon-gamma-responsiveness. Several transcripts were verified by immunohistochemical analysis of graft lesions, among them the matricellular protein periostin which was one of the most highly upregulated transcripts but has not been associated with transplantation previously. In conclusion, the majority of the differentially expressed genes in graft endothelial cells are affected by the transplantation procedure whereas relatively few are associated with allograft rejection.
2010-07-06 | GSE16695 | GEO
Project description:Global mRNA expression profiling of transplanted rat hindlimbs (muscle and skin) were collected using Agilent rat whole genome array (Agilent-028282 Whole Rat Genome Microarray 4x44K v3). Hind limb transplantation between Fischer344 (donor) and Lewis (recipient) rats were performed. Isogenic transplantations served as controls. Administration of irregular immunosuppression induced chronic rejection. At the endpoint (post-operativ day 100), hind limbs presented clinicial, histomorphological and genetic changes, known to be highly suspicious for chronic rejection.
2020-07-02 | GSE133843 | GEO
Project description:Leukocyte accumulation in graft blood vessels during self-limiting acute rejection of rat kidneys Immunobiology
| PRJNA117935 | ENA
Project description:Using meta-analysis of eight independent transplant datasets (236 graft biopsy samples) from four organs, we identified a common rejection module (CRM) consisting of 11 genes that were significantly overexpressed in acute rejection (AR) across all transplanted organs. The CRM genes could diagnose AR with high specificity and sensitivity in three additional independent cohorts (794 samples). In another two independent cohorts (151 renal transplant biopsies), the CRM genes correlated with the extent of graft injury and predicted future injury to a graft using protocol biopsies. Inferred drug mechanisms from the literature suggested that two FDA-approved drugs (atorvastatin and dasatinib), approved for non-transplant indications, could regulate specific CRM genes and reduce the number of graft infiltrating cells during acute rejection. We treated mice with HLA-mismatched murine cardiac transplant with atorvastatin and dasatinib and showed reduction of the CRM genes, significant reduction of graft infiltrating cells, and extended graft survival. We further validated the beneficial effect of atorvastatina on graft survival by retrospective analysis of electronic medical records of a single-center cohort of 2,515 renal transplant patients. In conclusion, we identified a CRM in transplantation that provides new opportunities for diagnosis, drug repositioning and rational drug design. The eight transplant data sets used for discovery include GSE4315, GSE2596, GSE4470, GSE9377, GSE1563, GSE9493, GSE13440, GSE6095. The two additional independent cohorts of 151 transplant biopsies are GSE25902 and GSE1563. Not all samples from all studies were used. Only the samples marked as either AR or STA in each data set were used for analysis. The 101 samples in this study were used as case-control experiment between acute rejection (AR) and stable (STA) in renal transplant. The samples in this series are one of the three independent validation cohorts. The other two cohorts are described in GSE21374 and GSE36059
2013-10-04 | E-GEOD-50058 | biostudies-arrayexpress
Project description:The data set contains 67 array (lymphochip cDNA array), published in N Engl J Med 2003 Jul 10;349(2):125-38. PMID: 12853585. TITLE: Molecular heterogeneity in acute renal allograft rejection identified by DNA microarray profiling. BACKGROUND: The causes and clinical course of acute rejection vary, and it is not possible to predict graft outcome reliably on the basis of available clinical, pathological, and genetic markers. We hypothesized that previously unrecognized molecular heterogeneity might underlie some of the variability in the clinical course of acute renal allograft rejection and in its response to treatment. METHODS: We used DNA microarrays in a systematic study of gene-expression patterns in biopsy samples from normal and dysfunctional renal allografts. A combination of exploratory and supervised bioinformatic methods was used to analyze these profiles. : We found consistent differences among the gene-expression patterns associated with acute rejection, nephrotoxic effects of drugs, chronic allograft nephropathy, and normal kidneys. The gene-expression patterns associated with acute rejection suggested at least three possible distinct subtypes of acute rejection that, although indistinguishable by light microscopy, were marked by differences in immune activation and cellular proliferation. Since the gene-expression patterns pointed to substantial variation in the composition of immune infiltrates, we used immunohistochemical staining to define these subtypes further. This analysis revealed a striking association between dense CD20+ B-cell infiltrates and both clinical glucocorticoid resistance (P=0.01) and graft loss (P<0.001). CONCLUSIONS: Systematic analysis of gene-expression patterns provides a window on the biology and pathogenesis of renal allograft rejection. Biopsy samples from patients with acute rejection that are indistinguishable on conventional histologic analysis reveal extensive differences in gene expression, which are associated with differences in immunologic and cellular features and clinical course. The presence of dense clusters of B cells in a biopsy sample was strongly associated with severe graft rejection, suggesting a pivotal role of infiltrating B cells in acute rejection. A disease state experiment design type is where the state of some disease such as infection, pathology, syndrome, etc is studied. Disease State: normal vs disease Keywords: disease_state_design Using regression correlation
2003-07-01 | E-GEOD-343 | biostudies-arrayexpress
Project description:Approximately 70% of kidney grafts are obtained from deceased donors, and these grafts must be preserved in hypothermic conditions to prolong their viability until transplantation. However, prolonged cold storage (CS) of kidneys results in poor long-term outcomes after transplantation. We reported previously that CS of rat kidneys for 18 h prior to transplant impaired proteasome function, disrupted protein homeostasis, and reduced graft function. The goal of the present study was to identify the renal proteins that are dysregulated by this CS-induced injury. Isolated donor Lewis rat kidneys were subject to 18-h CS and transplanted into recipient Lewis rats (CS+Tx). Autotransplantation (ATx: transplant with 0-h CS) or Sham (right nephrectomy) surgeries served as controls. The proteome of kidney homogenates was analyzed with tandem mass-tag mass spectrometry to identify CS-induced abnormalities in kidney grafts. CS injury disrupted the renal phosphoproteome in kidney grafts and dysregulated numerous signaling pathways. Integrated analysis of global proteomes and phosphoproteomes identified 15 proteins that were significantly regulated in a CS-specific manner. In particular, proteins and pathways such as complement and coagulation cascades were upregulated, while antioxidant pathways, such as glutathione, were suppressed in CS+Tx groups compared to ATx and Sham controls. This study, for the first time, provides deeper insight into the disruption of the renal graft proteome caused by CS injury and provides a novel set of pathways and molecules that can be investigated to delineate their specific role in renal transplant outcomes, ultimately improving outcomes for patients with end-stage kidney disease.
2024-04-18 | MSV000094566 | MassIVE