Project description:To investigate the effects of soluble factors produced by synovial CD8 T cells, we stimulated human rheumatoid arthritis (RA) synovial fibroblasts with supernatants from synovial fluid CD8 T cells, blood CD8 T cells, or synovial fluid CD4 T cells stimulated with anti-CD3/CD28 antibody-coated beads. For comparison, we stimulated RA synovial fibroblasts with recombinant TNF or interferon-gamma or T cell supernatants pre-incubated with TNF-blocking antibodies.
Project description:Background: Managing early-to-mid-stage knee osteoarthritis (OA) remains an unmet clinical need. Synovitis drives OA progression, but current anti-inflammatory therapies offer limited efficacy. Disrupted fibroblast lineage homeostasis is central in chronic inflammation, and targeting this may attenuate synovitis and pathological synovium-cartilage crosstalk in knee OA. Methods: Synovial single-cell sequencing, clinical histological and transcriptomic data assessed fibroblast lineage changes and similarities between dermal fibroblasts (DFb) and synovial fibroblasts. Labeled DFb injection in rat knees evaluated cell retention. Rat anterior cruciate ligament transection (ACLT) model with intra-articular DFb injection assessed the therapeutic efficacy. Co-cultures characterized DFb paracrine effects on synovial fibroblasts and chondrocytes. Proteomics identified active components in DFb supernatants. Results: OA synovium exhibits disrupted fibroblast lineage homeostasis, marked by a prominent pro-inflammatory phenotype in synovial fibroblasts. DFb show high transcriptomic and morphological similarity to synovial fibroblasts from healthy donors. Post-injection, DFb engrafted within the synovium with more than 3-week retention. Intra-articular DFb injection alleviated synovitis and cartilage degeneration in ACLT-induced OA rats. Co-cultures confirmed DFb alleviated cytokine-induced inflammatory responses in synovial fibroblasts and chondrocytes via paracrine mechanisms, and integrated proteomic/transcriptomic analyses identified apolipoprotein D (APOD) as a potential key mediator of these anti-inflammatory effects. Conclusions: This study validates a novel cell therapy for OA that targets disrupted fibroblast lineage homeostasis in synovitis. By modulating pro-inflammatory synovial fibroblasts and alleviating synovitis through restoring lineage homeostasis, DFb ameliorate OA progression, providing a new theoretical basis and practical approach for OA cell therapy research.
Project description:Synovial fibroblasts contribute to the inflammatory temporomandibular joint under pathogenic stimuli. Synovial fibroblasts and T cells participate in the perpetuation of joint inflammation in a mutual activation feedback, via secretion of cytokines and chemokines that stimulate each other. IL-17 is an inflammatory cytokine produced primarily by Th17 cells that plays critical roles in the pathogenesis of numerous autoimmune and inflammatory diseases. Here, we investigated the roles of IL-17A in temporomandibular joint disorders (TMD) by using genome-wide analysis of synovial fibroblasts isolated from patients with TMD. We analyzed the gene expression profiles of synovial fibroblasts that were treated with or without IL-17A. IL-17 induced gene expression in synovial fibroblasts from human temporomandibular joint was measured at 4 hours after treated with IL-17A (10 ng/ml) and untreated control samples. This experiment used one donor sample.
Project description:Synovial fibroblasts contribute to the inflammatory temporomandibular joint under pathogenic stimuli. Synovial fibroblasts and T cells participate in the perpetuation of joint inflammation in a mutual activation feedback, via secretion of cytokines and chemokines that stimulate each other. IL-17 is an inflammatory cytokine produced primarily by Th17 cells that plays critical roles in the pathogenesis of numerous autoimmune and inflammatory diseases. Here, we investigated the roles of IL-17A in temporomandibular joint disorders (TMD) by using genome-wide analysis of synovial fibroblasts isolated from patients with TMD. We analyzed the gene expression profiles of synovial fibroblasts that were treated with or without IL-17A.
Project description:To investigate effects of 4 mixture of cytokines including TNF-alpha, IL-1beta IFN-gamma, and TGF-bata1 on rhematoid arthritis synovial fibroblasts (RASFs), we treated RASFs (n = 3) with TNF-alpha (1 ng/mL), IL-1beta (0.1 ng/mL), IFN-gamma (10 ng /mL), TGF-beta1 (1 ng/mL) (4mix) or vehicle control (Veh) for 24 hours and conducted RNA-seq analysis.
Project description:The aim was to characterize the proteomic alterations in synovial fibroblasts from patients with juvenile idiopathic arthritis, with or without prior priming with inflamed synovial fluid. Synovial fibroblasts were isolated from the synovial fluid of patients with oligoarticular juvenile idiopathic arthritis via passaging. For the experiment, they were primed or not with a pool of 20% of pooled synovial fluid from patients for 48hrs.
Project description:Knee osteoarthritis (KOA), as a degenerative multifactorial disease, affects the quality of life and mental health of patients, and also brings a huge socioeconomic burden. Treating synovitis have shown promise as anti-inflammatory therapeutics in mitigating OA symptoms and disease progression. Here, by analysing synovial single-cell sequencing (scRNA-seq) data from KOA, we found that synovial fibroblasts (FLS) in OA synovium showed a distinct pro-inflammatory phenotype. We collected synovial tissue from patients with clinical OA as well as from healthy donors, and histological examination was consistent with findings in scRNA-seq. Inspired by recent cross-tissue fibroblast lineage studies, we identified by sequencing that healthy FLS in synovial tissues share transcriptome-level similarities with dermal fibroblasts (DFb). Subsequently, we revealed the local as well as systemic distribution of intra-articular injected DFbs by constructing/extracting two types of rat fibroblasts (luciferase DFbs as well as GFP DFbs). The results demonstrate that DFbs can be locally retained in the synovium for up to three weeks following targeted engrafting on it. And intra-articular injection does not result in DFbs migration to vital organs or the occurrence of histological changes in these organs. A rat model of KOA was constructed by anterior cruciate ligament transection (ACLT) in order to study the therapeutic effect of DFbs on KOA. After injection, the rats showed improvement in painful gait. In addition, histological as well as imaging results showed reduced synovitis and improvement in articular cartilage. Finally we verified the protective effect of DFbs on cytokine-stimulated chondrocytes in a co-culture system.
Project description:Knee osteoarthritis (KOA), as a degenerative multifactorial disease, affects the quality of life and mental health of patients, and also brings a huge socioeconomic burden. Treating synovitis have shown promise as anti-inflammatory therapeutics in mitigating OA symptoms and disease progression. Here, by analysing synovial single-cell sequencing (scRNA-seq) data from KOA, we found that synovial fibroblasts (FLS) in OA synovium showed a distinct pro-inflammatory phenotype. We collected synovial tissue from patients with clinical OA as well as from healthy donors, and histological examination was consistent with findings in scRNA-seq. Inspired by recent cross-tissue fibroblast lineage studies, we identified by sequencing that healthy FLS in synovial tissues share transcriptome-level similarities with dermal fibroblasts (DFb). Subsequently, we revealed the local as well as systemic distribution of intra-articular injected DFbs by constructing/extracting two types of rat fibroblasts (luciferase DFbs as well as GFP DFbs). The results demonstrate that DFbs can be locally retained in the synovium for up to three weeks following targeted engrafting on it. And intra-articular injection does not result in DFbs migration to vital organs or the occurrence of histological changes in these organs. A rat model of KOA was constructed by anterior cruciate ligament transection (ACLT) in order to study the therapeutic effect of DFbs on KOA. After injection, the rats showed improvement in painful gait. In addition, histological as well as imaging results showed reduced synovitis and improvement in articular cartilage. Finally we verified the protective effect of DFbs on cytokine-stimulated chondrocytes in a co-culture system.