Similar Datasets
Project description:Dissecting mechanisms by which MyoD and small molecules convert fibroblasts to muscle progenitor cells
| PRJNA718201 | ENA
Project description:Direct lineage reprogramming provides a unique system to study cell fate transitions and unearth molecular mechanisms that safeguard cellular identity. We previously reported on direct conversion of mouse fibroblasts into induced myogenic progenitor cells (iMPCs) by transient MyoD overexpression in concert with small molecules treatment. Here we employed integrative multi-omic approaches to delineate the molecular landscape of fibroblast reprogramming into iMPCs in comparison to transdifferentiation into myogenic cells solely by MyoD overexpression. Utilizing bulk RNA-sequencing and mass spectrometry, we uncovered molecular regulators and pathways that endow a myogenic stem cell identity on fibroblasts only in the presence of small molecule treatment. In addition, we demonstrate that Pax7+ cells in iMPCs share molecular attributes with myoblasts, however in addition express unique genes, proteins and pathways that are indicative of a more activated satellite cell-like state in vitro. Collectively, this study charts a molecular blueprint for reprogramming fibroblasts into muscle stem and progenitor cells and further establishes the fidelity of stable iMPC cultures in capturing skeletal muscle regeneration in vitro for disease modeling and basic research applications.
2022-05-19 | PXD029379 | Pride
Project description:The generation of myotubes from fibroblasts upon forced MyoD expression is a classic example of factor-induced reprogramming in mammals. We recently discovered that additional modulation of signaling pathways with small molecules facilitates reprogramming to more primitive induced muscle progenitor cells (iMPCs). However, the mechanisms by which a single transcription factor drives differentiated cells into distinct developmental states remain unknown. We therefore dissected the transcriptional and epigenetic dynamics of fibroblasts undergoing MyoD-dependent reprogramming to either myotubes or iMPCs using a novel MyoD transgenic model. To this end, we performed ATAC sequencing for Pax7-nGFP positive iMPCs/satellite cells, cells undergoing dedifferentiation (i.e. Dox+FRG) or transdifferentiation (i.e. Dox) and cells overexpressing a wild type MyoD or a mutant MyoD (i.e. MN) in the presence of FRG. Our analyses elucidate the role of MyoD in myogenic reprogramming and derive general principles by which transcription factors and signaling pathways cooperate to rewire cell identity. Our results may also inform on potential therapeutic applications of direct reprogramming.
2021-08-24 | GSE169488 | GEO
Project description:The generation of myotubes from fibroblasts upon forced MyoD expression is a classic example of factor-induced reprogramming in mammals. We recently discovered that additional modulation of signaling pathways with small molecules facilitates reprogramming to more primitive induced muscle progenitor cells (iMPCs). However, the mechanisms by which a single transcription factor drives differentiated cells into distinct developmental states remain unknown. We therefore dissected the transcriptional and epigenetic dynamics of fibroblasts undergoing MyoD-dependent reprogramming to either myotubes or iMPCs using a novel MyoD transgenic model. To this end, we performed RNA-sequencing for Pax7-nGFP positive (including high and low) iMPCs/satellite cells, cells undergoing dedifferentiation (i.e. Dox+FRG) or transdifferentiation (i.e. Dox) and cells overexpressing a wild type MyoD or a mutant MyoD (i.e. MN) in the presence of FRG. Our analyses elucidate the role of MyoD in myogenic reprogramming and derive general principles by which transcription factors and signaling pathways cooperate to rewire cell identity. Our results may also inform on potential therapeutic applications of direct reprogramming.
2021-08-24 | GSE169487 | GEO
Project description:The generation of myotubes from fibroblasts upon forced MyoD expression is a classic example of factor-induced reprogramming in mammals. We recently discovered that additional modulation of signaling pathways with small molecules facilitates reprogramming to more primitive induced muscle progenitor cells (iMPCs). However, the mechanisms by which a single transcription factor drives differentiated cells into distinct developmental states remain unknown. We therefore dissected the transcriptional and epigenetic dynamics of fibroblasts undergoing MyoD-dependent reprogramming to either myotubes or iMPCs using a novel MyoD transgenic model. To this end, we performed single cell RNA sequencing for Pax7-nGFP positive iMPCs/satellite cells and cells undergoing dedifferentiation (i.e. Dox+FRG) or transdifferentiation (i.e. Dox) Our analyses elucidate the role of MyoD in myogenic reprogramming and derive general principles by which transcription factors and signaling pathways cooperate to rewire cell identity. Our results may also inform on potential therapeutic applications of direct reprogramming.
2021-07-28 | GSE171039 | GEO
Project description:Skeletal muscle growth and regeneration rely on myogenic progenitor and satellite cells, the stem cells of postnatal muscle. Elimination of Notch signals during mouse development results in premature differentiation of myogenic progenitors and formation of very small muscle groups. Here we show that this drastic effect is rescued by mutation of the muscle differentiation factor MyoD. However, rescued myogenic progenitors do not assume a satellite cell position and contribute poorly to myofiber growth. The disrupted homing is due to a deficit in basal lamina assembly around emerging satellite cells and to their impaired adhesion to myofibers. On a molecular level, emerging satellite deregulate the expression of basal lamina components and adhesion molecules like integrin a7, collagen XVIIIa1, Megf10 and Mcam. We conclude that Notch signals control homing of satellite cells, stimulating them to contribute to their own microenvironment and to adhere to myofibers. Gene expression analysis using total RNA from FACS-isolated Vcam-1+/CD31-/CD45-/Sca1- embryonic muscle progenitor cells from E17.5 back muscle tissue of MyoD-/-, Pax3cre/+;Rbpjflox/flox;MyoD-/- and Pax3cre/+;DnMamlflox/flox;MyoD-/- mice.
2012-12-31 | E-GEOD-39379 | biostudies-arrayexpress
Project description:Transcription factor-based reprogramming provides an attractive approach to produce desired cell types for regenerative medicine purposes. Such cellular conversions are widely dependent on viral vectors to efficiently deliver and express defined factors in target cells. However, use of viral vectors is associated with unfavorable genomic integrations that can trigger deleterious molecular consequences, rendering this method a potential impediment to clinical applications. Here, we report on a highly efficient transgene-free approach to directly convert mouse fibroblasts into induced myogenic progenitor cells (iMPCs) by overexpression of synthetic MyoD-mRNA in concert with an enhanced small molecule cocktail. First, we performed a candidate compound screen and identified two molecules that enhance fibroblast reprogramming into iMPCs by suppression of the JNK and JAK/STAT pathways. Simultaneously, we developed an optimal transfection protocol to transiently overexpress synthetic MyoD-mRNA in fibroblasts. Combining these two techniques enabled robust and rapid reprogramming of fibroblasts into Pax7 positive iMPCs in as little as 10 days. Nascent transgene-free iMPCs proliferated extensively in vitro, expressed a suite of myogenic stem cell markers, and could differentiate into highly multinucleated and contractile myotubes. Furthermore, using global and single-cell transcriptome assays, we delineated gene expression changes associated with JNK and JAK/STAT pathway inhibition during reprogramming, and identified in iMPCs a Pax7+ stem cell subpopulation resembling satellite cells. Last, transgene-free iMPCs robustly engrafted skeletal muscles of a Duchenne muscular dystrophy mouse model, restoring dystrophin expression in hundreds of myofibers. In summary, this study reports on an improved and clinically safer approach to convert fibroblasts into myogenic stem cells that can efficiently contribute to muscle regeneration in vivo.
2023-07-24 | GSE208063 | GEO
Project description:Transcription factor-based reprogramming provides an attractive approach to produce desired cell types for regenerative medicine purposes. Such cellular conversions are widely dependent on viral vectors to efficiently deliver and express defined factors in target cells. However, use of viral vectors is associated with unfavorable genomic integrations that can trigger deleterious molecular consequences, rendering this method a potential impediment to clinical applications. Here, we report on a highly efficient transgene-free approach to directly convert mouse fibroblasts into induced myogenic progenitor cells (iMPCs) by overexpression of synthetic MyoD-mRNA in concert with an enhanced small molecule cocktail. First, we performed a candidate compound screen and identified two molecules that enhance fibroblast reprogramming into iMPCs by suppression of the JNK and JAK/STAT pathways. Simultaneously, we developed an optimal transfection protocol to transiently overexpress synthetic MyoD-mRNA in fibroblasts. Combining these two techniques enabled robust and rapid reprogramming of fibroblasts into Pax7 positive iMPCs in as little as 10 days. Nascent transgene-free iMPCs proliferated extensively in vitro, expressed a suite of myogenic stem cell markers, and could differentiate into highly multinucleated and contractile myotubes. Furthermore, using global and single-cell transcriptome assays, we delineated gene expression changes associated with JNK and JAK/STAT pathway inhibition during reprogramming, and identified in iMPCs a Pax7+ stem cell subpopulation resembling satellite cells. Last, transgene-free iMPCs robustly engrafted skeletal muscles of a Duchenne muscular dystrophy mouse model, restoring dystrophin expression in hundreds of myofibers. In summary, this study reports on an improved and clinically safer approach to convert fibroblasts into myogenic stem cells that can efficiently contribute to muscle regeneration in vivo.
2023-07-24 | GSE208059 | GEO
Project description:Skeletal muscle harbors quiescent stem cells termed satellite cells and proliferative progenitors termed myoblasts, which play pivotal roles during muscle regeneration. However, current technology does not allow permanent capture of these cell populations in vitro. Here, we show that ectopic expression of the myogenic transcription factor MyoD, combined with exposure to small molecules, reprograms mouse fibroblasts into expandable induced myogenic progenitor cells (iMPCs). iMPCs express key skeletal muscle stem and progenitor cell markers including Pax7 and Myf5 and give rise to Dystrophin-expressing myofibers upon transplantation, a subset of which maintain Pax7 expression in vivo and sustain serial regenerative responses. Similar to satellite cells, iMPCs originate from Pax7+ cells and require Pax7 itself for maintenance. Finally, we show that iMPCs can be established from muscle tissue following small molecule exposure alone. This study thus reports on a robust approach to derive expandable myogenic stem/progenitor-like cells from multiple differentiated cell types.
2018-05-01 | GSE108543 | GEO
Project description:Skeletal muscle harbors quiescent stem cells termed satellite cells and proliferative progenitors termed myoblasts, which play pivotal roles during muscle regeneration. However, current technology does not allow permanent capture of these cell populations in vitro. Here, we show that ectopic expression of the myogenic transcription factor MyoD, combined with exposure to small molecules, reprograms mouse fibroblasts into expandable induced myogenic progenitor cells (iMPCs). iMPCs express key skeletal muscle stem and progenitor cell markers including Pax7 and Myf5 and give rise to Dystrophin-expressing myofibers upon transplantation, a subset of which maintain Pax7 expression in vivo and sustain serial regenerative responses. Similar to satellite cells, iMPCs originate from Pax7+ cells and require Pax7 itself for maintenance. Finally, we show that iMPCs can be established from muscle tissue following small molecule exposure alone. This study thus reports on a robust approach to derive expandable myogenic stem/progenitor-like cells from multiple differentiated cell types.
2018-05-01 | GSE92336 | GEO