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Stem cell dynamic and signalling controlling mechanical force mediated skin expansion

ABSTRACT: Stem cell dynamic and signalling controlling mechanical force mediated skin expansion

PROVIDER: PRJNA523144 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8590752_1.fastq.gz	Fastqsanger.gz
	SRR8590752_2.fastq.gz	Fastqsanger.gz
	SRR8590753_1.fastq.gz	Fastqsanger.gz
	SRR8590753_2.fastq.gz	Fastqsanger.gz

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Stem cell dynamic and signalling controlling mechanical force mediated skin expansion

Project description:This SuperSeries is composed of the SubSeries listed below.

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Mechanical force promotes dimethylarginine dimethylaminohydrolase 1-mediated hydrolysis of the metabolite asymmetric dimethylarginine to enhance bone formation

Project description:<p>Mechanical force is critical for the development and remodeling of bone. Here we report that mechanical force regulates the production of the metabolite asymmetric dimethylarginine (ADMA) via regulating the hydrolytic enzyme dimethylarginine dimethylaminohydrolase 1 (Ddah1) expression in osteoblasts. The presence of -394 4N del/ins polymorphism of Ddah1 and higher serum ADMA concentration are negatively associated with bone mineral density. Global or osteoblast-specific deletion of Ddah1 leads to increased ADMA level but reduced bone formation. Further molecular study unveils that mechanical stimulation enhances TAZ/SMAD4-induced Ddah1 transcription. Deletion of Ddah1 in osteoblast-lineage cells fails to respond to mechanical stimulus-associated bone formation. Taken together, the study reveals mechanical force is capable of down-regulating ADMA to enhance bone formation.</p>

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Mechanisms of stretch-mediated skin expansion at single cell resolution [array]

Project description:The ability of the skin to expand in response to stretching has, for decades, been exploited in reconstructive surgery. Several studies have investigated the response of stretching epidermal cells in vitro. However, it remains unclear how mechanical forces affect epidermal stem cell behaviour in vivo. Here, we develop a mouse model in which the temporal consequences of the stretching the skin epidermis can be studied. Using a multidisciplinary approach that combines clonal analysis and mathematical modelling, we show that mechanical force induces skin expansion by promoting the renewal of epidermal stem cells. This occurs through a structured response in which cell fates are coordinated locally by stem cells that switch between states primed for renewal or differentiation. Transcriptional and chromatin profiling identifies the gene regulatory networks modulated by mechanical force. Using a combination of pharmacological inhibition and several conditional gene loss-of-function mouse mutants, we dissect the signalling pathways that control force-mediated tissue expansion. We used microarray to molecularly profile basal cells isolated from the interfolliular epidermis during force-mediated tissue expansion and after 12-O-Tetradecanoylphorbol-13-acetate (TPA) tretment.

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Mechanical force induces rapid phosphorylation-dependent signaling in Xenopus embryos

Project description:We inegrated quantitative phosphoproteome, proteome, a tergeted MS analysis, in conjunction with pathway perturbation to obtain a global view of the mechano-responses of embryonic tissues. This study provides mechanistic insights into mechanical force sensing pathways.

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Fibroblast-specific focal adhesion kinase links mechanical force to fibrosis via chemokine-mediated inflammatory pathways

Project description:Hypertrophic scar (HTS) formation is characterized by exuberant fibroproliferation for reasons that remain poorly understood1. One important but often overlooked component of wound repair is mechanical force, which regulates reciprocal cell-matrix interactions through focal adhesion components including focal adhesion kinase (FAK)1,2. Here we report that FAK is activated following cutaneous injury and that this activation is potentiated by mechanical loading. Transgenic mice lacking fibroblast-specific FAK exhibit significantly less fibrosis in a preclinical model of HTS formation. Inflammatory pathways involving monocyte chemoattractant protein-1 (MCP-1), a chemokine highly implicated in human skin fibrosis3, are triggered following FAK activation, mechanistically linking physical force to fibrosis. Further, small molecule inhibition of FAK effectively abrogates fibroproliferative mechanisms in human cells and significantly reduces scar formation in vivo. Collectively, these findings establish a molecular basis for HTS formation based on the mechanical activation of fibroblast-specific FAK and demonstrate the therapeutic potential of targeted mechanomodulatory strategies. Wildtype murine tissue was harvested at either day 6 or 14 post-injury following 48 hours or 10 days of mechanical loading, respectively (n=4 mice per group per time point). Murine RNA was isolated, labeled, and hybridized to the GeneChip microarray according to the manufacturer’s protocols (Affymetrix, Santa Clara, CA, USA). Each gene in the microarray was represented by 20 oligonucleotide pairs, with each pair consisting of an oligonucleotide perfectly matched to the cDNA sequence, and a second oligonucleotide containing a single base mismatch. Raw microarray data (sample intensity files) were processed using GeneSpring GX 11.0 (Agilent Technologies Inc., Santa Clara, CA, USA).

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Fibroblast-specific focal adhesion kinase links mechanical force to fibrosis via chemokine-mediated inflammatory pathways

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