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Transcriptional analysis of tendons from mice

ABSTRACT: We report RNA sequencing data from the Achilles, patellar, supraspinatus, and forepaw flexor tendons of adult male mice in the C57Bl/6 background.

ORGANISM(S): Mus musculus

PROVIDER: GSE138537 | GEO | 2019/12/18

REPOSITORIES: GEO

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Transcriptional analysis of tendons from rat

Project description:We report RNA sequencing data from the Achilles, patellar, supraspinatus, and forepaw flexor tendons of adult male rats in the Sprague-Dawley

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Transcriptional analysis of tendons from mice with a tenocyte-specific deletion of IGF1R

Project description:We report RNA sequencing data from the plantaris tendons of adult male mice in the C57Bl/6 background that either have the IGF1 receptor (IGF1R) present in their tendons (Scx:IGF1R+) or mice in which IGF1R has been deleted in tenocytes expressing scleraxis (Scx:IGF1R-). Mice were created by crossing ScxCreERT2 mice with IGF1R flox/flox mice. Mice were treated with tamoxifen for 5 days to induce recombination at the IGF1R allele, and then subjected to a synergist ablation procedure in which the Achilles tendon is removed, resulting in compensatory growth of the plantaris tendon. Mice were analyzed either 7 or 14 days after synergist ablation. Control mice that did not undergo tamoxifen treatment or synergist ablation were also studied.

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Expression data from post-natal rat Achilles tendons

Project description:We have compared the gene expression profile of post-natal 1 day and 7 day rat Achilles tendons. Post-natal 1 day and 7 day rat Achilles tendons were collected. Each sample contains at least two individuals. Total RNA was extracted and fragmented biotin-tagged cRNA was hybridized to Rat Genome 230 2.0 Array.

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Transcriptional analysis of tendons from mice with a targeted deletion of scleraxis

Project description:We report RNA sequencing data from the plantaris tendons of adult male mice in the C57Bl/6 background that either have the scleraxis gene (Scx+) or mice in which scleraxis has been deleted using CreERT2 driven from the Rosa26 locus (Scx-). Mice in which scleraxis was deleted were created by crossing scleraxis-floxed mice with Rosa26-CreERT2 mice. Rosa26-CreERT2 mice that did not have a floxed scleraxis allele served as controls. Mice were treated with tamoxifen for 5 days to induce recombination at the scleraxis locus, and then subjected to a synergist ablation procedure in which the Achilles tendon is removed, resulting in compensatory growth of the plantaris tendon. Mice were analyzed either 7 or 14 days after synergist ablation. Control mice that did not undergo tamoxifen treatment or synergist ablation were also studied (NOC).

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Expression data from post-natal rat Achilles tendons

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Project description:We report a single cell transcriptome atlas of Achilles tendon from 6-week-old male C57Bl/6 mice using single cell RNA sequencing.

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Structure-function Relationships in Human Tendons: Interfascicular Matrix Specialisation in the Achilles Tendon C4PR_LIV

Project description:Tendon is a highly aligned connective tissue, in which the macro-structure consists of collagen-rich fascicles surrounded by interfascicular matrix (IFM). In a series of recent studies in equine tissue, we have demonstrated specialisation of tendon composition, structure and mechanics to achieve the tendon’s functional requirements, specifically reporting extensive specialisation of the IFM region in the energy storing superficial digital flexor tendon. We have also demonstrated loss of functional specialisms with ageing, leading to a hypothesised new paradigm for tendinopathy, focused on the importance of the IFM. However, to date, there have been no studies focused on structure-function specialisation or the IFM in functionally distinct human tendons. Here, we compare the positional anterior tibialis tendon and energy storing Achilles tendon, performing a detailed analysis of the composition and mechanical properties of both fascicle and IFM regions, to test the hypothesis that the IFM in the energy storing Achilles tendon has specialised composition and mechanical properties, and that these specialisations are lost with ageing. We demonstrate that the IFM is specialised in the energy storing Achilles tendon, with greater elasticity and fatigue resistance than in the positional anterior tibialis tendon. While there were few age-related alterations in mechanics, we did identify age-related alterations in the IFM proteome of the Achilles tendon specifically, which is predicted to be regulated by TGF-beta signalling and may be responsible for the trend towards decreased fatigue resistance observed in the Achilles IFM with ageing.

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Accelerated flexor tendon repair in superhealer mice reflects alterations in TGFB1 regulated expression programs linked to inflammatory, fibrosis and cell cycle control

Project description:Purpose: The goal of this study is to compare transcriptional profiles of flexor tendon healing in wild-type (WT, C57Bl/6J) to superhealer (MRL/MpJ) miceto gain insights in the biological drivers of the tendon injury response between the C57 and MRL mice. Methods: RNA was isolated from patially lacerated or uninjured flexor tendon 7 days post-injury. Results: Transcriptional analysis of biological drivers showed positive enrichment of TGFB1 in both C57 and MRL healing tendons. only MRL tendons exhibited downstream transcriptional effects of cell cycle regulatory genes, with negative enrichment of the cell senescence-related regulators, compared to the positively-enriched inflammatory and ECM organization pathways in the C57 tendons. Conclusions: There is altered TGFB1 regulated inflammatory, fibrosis, and cell cycle pathways in flexor tendon repair.

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Project description:Single cell transcriptional atlas of mouse Achilles tendons

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Transcriptomic Analysis of Cellular Pathways during Healing of Flexor Tendons in Plasminogen Activator Inhibitor Type 1, Member 1 (PAI-1/Serpine1) Null Mice

Project description:Injuries to flexor tendons can be complicated by fibrotic adhesions, which severely impair the function of the hand. Adhesions have been associated with PAI-1, a master suppressor of protease activity including matrix metalloproteinases (MMP). In the present study, we used next generation RNA sequencing (RNA-seq) to assess genome-wide differences in mRNA expression due to PAI-1 deficiency after zone II flexor tendon injury. Ingenuity pathway analysis was used to characterize molecular pathways and biological drivers associated with differentially expressed genes. Analysis of hundreds of overlapping and differentially-expressed genes in PAI-1 knockout and C57Bl/6J mice during tendon healing revealed common and distinct biological processes associated with the regulation of matrix organization, cell cycle, and immune response. Most importantly, we identified the activation of PTEN signaling and the inhibition of FOXO1-associated biological processes as a unique transcriptional signature of the healing tendon in the PAI-1 KO mice. The differences in transcriptomics between the two mouse strains are transcriptionally related to complex cross-talk between PI3K/Akt/mTOR, PKC, and MAPK signaling cascades that drive differences in transcriptional regulation of cell proliferation, survival and senescence, and chronic inflammation as potential drivers of fibrotic healing and adhesions in the C57Bl/6J injured tendons. These transcriptional observations should guide future studies to develop an improved understanding of the biological limitations of tendon healing as the basis for rational design of targeted therapeutics for scar-free regenerative healing of tendon.

2019-05-31 | GSE125026 | GEO

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