Effect of dynamic compression on meniscus tissue explants in the presence and absence of IL-1
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ABSTRACT:
PROVIDER: PRJNA789924 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR17265350.fastq.gz | Fastqsanger.gz | |||
| SRR17265351.fastq.gz | Fastqsanger.gz | |||
| SRR17265352.fastq.gz | Fastqsanger.gz | |||
| SRR17265353.fastq.gz | Fastqsanger.gz | |||
| SRR17265354.fastq.gz | Fastqsanger.gz |
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Project description:Meniscus injuries are highly prevalent and are linked to the development of post-traumatic osteoarthritis (PTOA). The inflammatory cytokine IL-1 is elevated in synovial fluid following knee injuries, causes degradation of meniscus tissue, and inhibits meniscus repair. Dynamic mechanical compression of meniscus tissue has been shown to improve integrative repair in the presence of IL-1; however, there remains a dearth of knowledge on global effects of loading on meniscus cell phenotype and transcriptomic profiles. In this study, we performed mRNA-Seq on meniscus tissue explants from inner and outer zone regions of porcine menisci subjected to dynamic compression in the presence and absence of IL-1 to identify cellular responses to mechanical load, identify differences in response to load based on zonal characteristics, and identify IL-1 induced inflammatory responses modulated by load.
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Project description:Meniscus injuries are highly prevalent and are linked to the development of post-traumatic osteoarthritis (PTOA). The inflammatory cytokine IL-1 is elevated in synovial fluid following knee injuries, causes degradation of meniscus tissue, and inhibits meniscus repair. Cyclic tensile stretch has been shown to modulate the expression of pro-inflammatory cytokines and degradative enzymes induced by IL-1; however, there remains a dearth of knowledge on global effects of loading on meniscus cell phenotype and transcriptomic profiles. In this study, we performed mRNA-Seq on meniscus cells isolated from inner and outer zone regions of porcine menisci subjected to cyclic tensile strain in the presence and absence of IL-1 to identify cellular responses to mechanical load, identify differences in response to load based on zonal characteristics, and identify IL-1 induced inflammatory responses modulated by load.
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2008-06-12 | E-GEOD-3712 | biostudies-arrayexpress
Project description:This study investigates the transcriptome response of meniscus fibrochondrocytes (MFCs) to the low oxygen and mechanical loading signals experienced in the knee joint using a model system. We hypothesized that short term exposure to the combined treatment would promote a matrix-forming phenotype supportive of inner meniscus tissue formation. Human MFCs on a collagen scaffold were stimulated to form fibrocartilage over 6weeks under normoxic (NRX, 20% O2) conditions with supplemented TGF -β3. Tissues experienced a delayed 24h hypoxia treatment (HYP, 3% O2) and then 5min of dynamic compression (DC) between 30 and 40% strain. Delayed HYP induced an anabolic and anti-catabolic expression profile for hyaline cartilage matrix markers, while DC induced an inflammatory matrix remodeling response along with upregulation of both SOX9 and COL1A1. There were 41 genes regulated by both HYP and DC. Overall, the combined treatment supported a unique gene expression profile favouring the hyaline cartilage aspect of inner meniscus matrix and matrix remodeling.
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Project description:Effect of cyclic tensile stretch on meniscus cells in the presence and absence of IL-1
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Project description:Human engineered meniscus transcriptome after short-term combined hypoxia and dynamic compression
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Project description:Anterior cruciate ligament (ACL) tears occur in isolation or in combination with other intra-articular injuries such as meniscus tears. The impact of injury pattern on the molecular biology of the injured ACL is unknown. Here, we tested the hypothesis that the biological response of the ACL to injury varies based on the presence or absence of concomitant meniscus tear. RNA-seq analysis was performed on 28 ACL tears remnants (12 isolated, 16 combined). 16,654 transcripts were differentially-expressed between isolated and combined injury groups at false-discovery-rate of 0.05. Due to the large number of differentially expressed transcripts, we undertook an Ensembl approach to discover features that acted as hub-genes that did not necessarily have large fold-changes or high statistical significance, but instead had high biological significance. Our data revealed a negatively-correlated turquoise-module containing 5960 transcripts (down-regulated in combined injury) and a positively-correlated blue-module containing 2260 transcripts (up-regulated in combined injury). TNS1, MEF2D, NOTCH3, SOGA1, and MLXIP were highly-connected hub-genes in the turquoise-module and SCN2A, CSMD3, LRC44, USH2A, and LRP1B were critical hub-genes in the blue-module. Transcripts in the turquoise-module were associated with biological-adhesion, actin-filament organization, cell-junction assembly, and cell-matrix adhesion. The blue-module transcripts were enriched for neuron-migration and exocytosis-regulation. These findings indicate a loss of healing and gain of neurogenic signaling in combined ACL and meniscus tears, suggesting they have diminished potential for repair. The biological response of the ACL to injury could have implications for the healing potential of the ligament and the long-term health of the knee.
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Project description:Meniscus fibrochondrocytes (MFCs) experience simultaneous hypoxia and mechanical loading in the knee, conditions that have promising applications in human meniscus tissue engineering. We hypothesized that “mechano-hypoxia conditioning,” using mechanical loading such as dynamic compression (DC) and cyclic hydrostatic pressure (CHP), would enhance development of human meniscus fibrocartilage extracellular matrix in vitro. MFCs from inner human meniscus surgical discards were pre-cultured on porous type I collagen scaffolds with TGF-β3 supplementation to form baseline tissues with newly-formed matrix. They were then treated with DC or CHP under hypoxia (HYP, 3% O2) for 5 days. DC was the more effective load regime, and combined HYP/DC enhanced gene expression of fibrocartilage precursors. The individual treatments of DC and HYP regulated thousands of genes and combined in an overwhelmingly additive rather than synergistic manner. Baseline tissues were then treated with a short course of DC (5 vs 60 minutes, 10-20% vs 30-40% strain) with different pre-culture durations (3 vs 6 weeks). Longer courses of loading had diminishing returns in terms of gene regulation. There was a dose-effect for higher DC strains, whereas outcomes were mixed for different MFC donors in pre-culture durations. Finally, baseline tissues were conditioned for 3 weeks with mechano-hypoxia conditioning to assess mechanical and protein-level outcomes. There were 1.8 to 5.1-fold gains in the dynamic modulus relative to baseline in HYP/DC, but matrix outcomes were equal or inferior to static controls. Long-term mechano-hypoxia conditioning was effective in suppressing hypertrophic markers (e.g., COL10A1 10-fold suppression vs static/normoxia). Applied appropriately, mechano-hypoxia conditioning can support meniscus fibrocartilage development in vitro and may be useful as a strategy for developing non-hypertrophic articular cartilage using mesenchymal stem cells.
2021-08-23 | GSE180467 | GEO
Project description:Meniscus injuries are common and while surgical strategies have improved, there is a need for alternative therapeutics to improve long-term outcomes and prevent post-traumatic osteoarthritis. Current research efforts in regenerative therapies and tissue engineering are hindered by a lack of understanding of meniscus cell biology and a poorly defined meniscus cell phenotype. This study utilized bulk RNA-sequencing to identify unique and overlapping transcriptomic profiles in cartilage, inner and outer zone meniscus tissue, and passaged inner and outer zone meniscus cells. The greatest transcriptomic differences were identified when comparing meniscus tissue to monolayer cultured cells (> 4,600 differentially expressed genes (DEGs)) and meniscus tissue to cartilage (> 3,100 DEGs). While zonal differences exist within the meniscus tissue (205 DEGs between inner and outer zone meniscus tissue), meniscus resident cells are more similar to each other than to either cartilage or monolayer meniscus cells. Additionally, we identified and validated LUM and PRRX1 as potential markers for meniscus tissue and ACTA2, FSTL1, SFRP2, and TAGLN as novel markers for meniscus cell dedifferentiation. Our data contribute significantly to the current characterization of meniscus cells and provide an important foundation for future work in meniscus cell biology, regenerative medicine, and tissue engineering.
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