Expression data from mouse arthritis tarsal joints
ABSTRACT: Pathological bone changes differ considerably between inflammatory arthritic diseases, and most studies have focused on bone erosion. Collagen Induced Arthritis (CIA) is a model for Rheumatoid Arthritis, which, in addition to bone erosion, demonstrates bone formation at the time for clinical manifestations. The objective of this study was to use the CIA model to study bone remodelling by performing a gene expression profiling time-course study on the CIA model. Three tarsal joints were sampled per clinical phase from the following clinical phases: Duration of clinical arthritis 0-3 days, duration of clinical arthritis 1-2 weeks, duration of clinical arthritis 3-4 weeks and duration of clinical arthritis minimum 3 weeks and declining (Twelve joints in total). For the clinical phase “Decline” the joints had had a clinical score of 3 for minimum 3 weeks, after which the clinical score had declined minimum 1 score when the joint was sampled. For all other joints, the clinical score was 3 at the sampling time. The twelve joints were compared to three joints from non-induced control animals. The joints were processed and analysed separately (unpooled ). The joints were snap-frozen in liquid N2 and stored at -80˚C. RNA was extracted using the mirVanaTM miRNA isolation kit (Ambion, Denmark), amplified and labelled using the Pico amplification kit (Nugen, San Carlos, USA), according to the manufacturers´ instructions, followed by hybridisation to Mouse Gene 1.0ST microarrays (Affymetrix, Santa Clara, USA). The quality of the RNA was evaluated using RNA integrity numbers (RIN) and only samples with values of minimum 8.4 were chosen for further analysis.
Project description:In previous studies, we identified the fungal macrocyclic lactone (S)-curvularin (SC) as an anti-inflammatory agent using a screening system detecting inhibitors of the Janus kinase/signal transducer and activator of transcription pathway. The objective of the present study was to investigate whether SC is able to decrease proinflammatory gene expression in an in vivo model of a chronic inflammatory disease. Therefore, the effects of SC and dexamethasone were compared in the model of collagen-induced arthritis (CIA) in mice. In addition to measuring the arthritis index (paw swelling) of the animals, we also performed whole genome microarray analyses to identify SC target genes and new therapeutic targets of SC.
Project description:The molecular basis to autoimmune arthritis is unclear. Collagen Induced Arthritis (CIA) in mice, is a model that has many features that resemble Rheumatoid Arthritis (RA), although it does not perfectly duplicate RA. The study of CIA has provided insight into relevant pathogenesis and has aided in the identification of potential therapeutic targets. In this study we used Mouse Cytokine Expression Arrays to examine gene expression levels in joints at early, peak and decline stages during disease in DBA/1 mice. The aim of the study was to identify candidate molecules that may be involved in the development and progression of collagen-induced arthritis (CIA). Keywords: Disease State Analysis Overall design: 18 samples were analysed. 9 samples were from mice with CIA at early rising, peak and declining phases of the disease (3 mice at each time point). A further 9 samples were from normal joint tissue obtained from naïve DBA/1 mice at the same ages as the mice with CIA (also 3 mice each group). Prepared samples were hybridized to R&D Systems Mouse Cytokine Arrays. These arrays were spotted with murine cDNAs representing 514 immuno-modulatory factors including 46 chemokines and receptors, 20 proteases, 17 integrins and 8 house keeping genes.
Project description:The variant rs26232, in the first intron of the C5orf30 locus, has recently been associated with both risk of developing rheumatoid arthritis (RA) and severity of tissue damage. The biological activities of human C5orf30 are unknown, and neither the gene nor protein show significant homology to any other characterized human sequences. The C5orf30 gene is present only in vertebrate genomes with a high degree of conservation implying a central function in these organisms. Here we report that C5orf30 is highly expressed in the synovium of RA patients compared with control synovial tissue, and that it is predominately expressed by synovial fibroblast (RASF) and macrophages in the lining and sublining layer of the tissue. These cells play a central role in the initiation and perpetuation of RA and are implicated in cartilage destruction. RASFs lacking C5orf30 exhibit increased cell migration and invasion in vitro and gene-profiling following C5orf30 inhibition confirmed upregulation of genes involved in cell migration, adhesion, angiogenesis, and immune and inflammatory pathways. Importantly, loss of C5orf30 contributes to the pathology of inflammatory arthritis in vivo, since inhibition of C5orf30 in the collagen-induced arthritis model markedly accentuated joint inflammation and tissue damage. Our study reveal C5orf30 to be a novel negative regulator of tissue damage in RA and this may act by modulating the autoaggressive phenotype that is characteristic of RASFs. Rheumatoid arthritis (RA) is a chronic, autoimmune, inflammatory disease that affects synovial joints. A key characteristic of RA is hyperplasia of fibroblast-like synoviocytes (FLS) which develop a stable, auto-aggressive phenotype that augments tissue destruction. It is unknown how this phenotype is stably maintained; however, epigenetic changes have been implicated. Histone deacetylation is one proposed method; a process controlled by histone deacetylases (HDACs). However, there have recently been reports publishing conflicting data regarding the expression of HDACs in RA synovium and FLS. The objective of this thesis is to determine the role of HDACs in regulating the auto-aggressive phenotype of RA through studies in FLS and in mice. Real time-quantitative PCR was used to assess the levels of HDAC1-11 in RA compared to osteoarthritis (OA) FLS. Immunohistochemistry and western blotting were used to assess protein expression of HDAC1 in RA and OA synovial tissue and FLS. HDAC1 was found to be overexpressed in RA compared to OA. HDAC1 was knocked down in RA FLS, then cell proliferation, migration and invasion were assessed by using tritiated thymidine, a scratch assay and a Matrigel invasion assay respectively. All three functions were significantly reduced following HDAC1 knockdown. An Illumina BeadChip (47,000 transcripts) was used to analyse global gene expression changes after knockdown. This revealed significant gene changes in important functional clusters, such as proliferation and migration. HDAC1 knockout is embryonic lethal in mice, so the in vivo role of HDAC1 was investigated in a mouse model of collagen-induced arthritis (CIA) using in vivo siRNAs. Clinical scores of CIA were measured daily and HDAC1 knockdown mice showed a significantly reduced clinical score compared to controls, comparable to dexamethasone-treated mice. The bones were analysed using a microCT scanner and histology. Knocking down HDAC1 showed reduced bone erosion, joint inflammation and cartilage degradation compared to controls. Overall, this study shows that HDAC1 is dysregulated in RA and it has a significant role in the autoaggressive phenotype shown in RA FLS and collagen-induced arthritis. The novel data shown in this thesis demonstrates that inhibiting HDAC1 may provide a powerful new target for treating RA. Three independent patient RASF samples were analysed in this study for each siRNA gene knockdown. Also a non targerting control siRNA was also used for each of the patient RASFs
Project description:Rheumatoid arthritis is an autoimmune disease in which joint inflammation lead to progressive cartilage and bone destruction. Matrix metalloproteinases (MMP) implicated in homeostasis of extracellular matrix (ECM) play a central role in cartilage degradation. The aim of this study was to investigate the role of MMP-8 (collagenase-2) suppression in the K/BxN serum-transfer arthritis model. Three male mice of each following groups: MMP-8 wild type and arthritic mice, MMP-8 wild type without arthritis (wild type control), MMP-8 KO and arthritic mice and MMP-8 KO without arthritis (KO control) were selected for RNA extraction, from ankle joints, and hybridation on Affymetrix microarrays. Male mice were used because they showed a trend to higher arthritis severity compared to female mice. In arthritic mice, ankle joints were taken 7 days after arthritis induction.
Project description:Rheumatoid arthritis is an autoimmune disease in which joint inflammation lead to progressive cartilage and bone destruction. Matrix metalloproteinases (MMP) implicated in homeostasis of extracellular matrix (ECM) play a central role in cartilage degradation. The aim of this study was to investigate the role of MMP-8 (collagenase-2) suppression in the K/BxN serum-transfer arthritis model. Overall design: Three male mice of each following groups: MMP-8 wild type and arthritic mice, MMP-8 wild type without arthritis (wild type control), MMP-8 KO and arthritic mice and MMP-8 KO without arthritis (KO control) were selected for RNA extraction, from ankle joints, and hybridation on Affymetrix microarrays. Male mice were used because they showed a trend to higher arthritis severity compared to female mice. In arthritic mice, ankle joints were taken 7 days after arthritis induction.
Project description:Osteoarthritis is characterized by degeneration of cartilage and bone in the synovial joints. Recent findings suggest that inflammation may play a role in osteoarthritis, with synovitis being associated with the clinical symptoms of osteoarthritis. Furthermore, we have found that levels of inflammatory complement components are abnormally high in the synovial fluid of individuals with osteoarthritis. To determine whether synovial membranes could be a source of complement and other inflammatory molecules in osteoarthritic joints, we characterized the expression of genes in synovial membranes from patients with early-stage or end-stage osteoarthritis. Samples of synovial membrane were obtained from the suprapatellar pouch of patients with osteoarthritis who were treated at the Hospital for Special Surgery. Specifically, samples were from 10 patients with early-stage knee osteoarthritis who were undergoing arthroscopic procedures for degenerative meniscal tears (with documented cartilage degeneration but no full-thickness cartilage loss, Kellgren Lawrence score </=2), and from 9 patients with end-stage knee osteoarthritis ( diffuse full thickness cartilage erosion) who were undergoing total knee joint replacement. Raw data from microarray analysis of healthy synovial membranes, which were run on the same platform and array as our osteoarthritic samples, were downloaded from the NCBI Gene Expression Omnibus (accession number GSE12021) and used for comparison. The 19 new Samples of this Series were analyzed (RMA) together with 7 previously submitted healthy individual Samples (GSM175810, GSM175812, GSM176290, GSM176291, GSM176292, GSM176268, GSM176269). The complete RMA data are provided as a supplementary file on the Series record. The GSE12021 reanalyzed data are also provided as a supplementary file on the Series record. GSE32317_12genes.txt includes data from figure 1 of the paper.
Project description:We found microRNA miR-23b was down-regulated in local inflammatory tissues of autoimmune disease such as RA, SLE and related mouse models such as CIA, lpr, EAE. Re-expression of miR-23b significantly inhibits autoimmune pathogenesis of CIA, Lpr and EAE. To identify potential targets of miR-23b, we use microarray gene-expression analysis to identify transcripts which could be repressed by miR-23b. RA: rheumatoid arthritis, CIA: Collagen-induced arthritis, SLE: systemic lupus erythematosus, EAE: experimental autoimmune encephalomyelitis We tansfected fibroblast-like synoviocytes (FLS) with mimic-miR-23b or mimic-NC.Cells were collected and total RNA was extracted for the Affymetrix GeneChip® Human Genome U133 Plus 2.0 Array
Project description:Monocyte Locomotion Inhibitory Factor (MLIF), an amoebic peptide, has an anti-inflammatory role, delaying the arrival of mononuclear cells to inflammatory sites, down regulating adhesin molecules and chemokines. We used microarrays to detail the global gene expression underlying anti-inflammatory effect of MILF in an inflammatory model. Collagen type II (CII) emulsified on complet Freund adjuvant, was injected on the tail of the base of DBA1J mice, 8 weeks older, and booster with CII emulsified in incomple Freund adjuvant three weeks later. MLIF was administrated intranasally weekly since one week before induction. Keywords: comparison effect Articular tissues of all mices were collected at the peak time of clinical severity (four weeks before booster), for RNA extraction and hybridization on Affymetrix microarrays. We induces CIA with chicken collagen type II, emulsified with Complet Adjuvant of Freund, and the controls were mice induced only with Complet Adjuvant of Freund with or without MLIF
Project description:Knee joint synovium was used for gene expression analysis of mouse collagen induced arthritis (CIA). Synovium was prepared at day 30 after initial sensitization from: healthy controls, CIA animals with no, with mild, with moderate, or with severe joint inflammation. Each sample group is represented by three replicates, each consisting of tissue collected from three to four animals. Experiment Overall Design: The data set consists of 15 samples: five groups with three replicates each. One sample group is from healthy controls, the other groups are from CIA animals with different degress of joint inflammation.