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Robust Cardiac Reprogramming Systems with Selectivity to Cardiac Fibroblasts

ABSTRACT: Robust Cardiac Reprogramming Systems with Selectivity to Cardiac Fibroblasts

PROVIDER: PRJNA878785 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21504400_1.fastq.gz	Fastqsanger.gz
	SRR21504400_2.fastq.gz	Fastqsanger.gz
	SRR21504401_1.fastq.gz	Fastqsanger.gz
	SRR21504401_2.fastq.gz	Fastqsanger.gz
	SRR21504402_1.fastq.gz	Fastqsanger.gz

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Robust Cardiac Reprogramming Systems with Selectivity to Cardiac Fibroblasts

Project description:Direct cardiac reprogramming to induce cardiomyocyte-like cells, e.g. by GMT (Gata4, Mef2c and Tbx5), is a promising route for regenerating damaged heart in vivo and disease modeling in vitro. Supplementation with additional factors and chemical agents can enhance efficiency but raises concerns regarding selectivity to cardiac fibroblasts and complicates delivery for in situ cardiac reprogramming. Here, we screened 2000 chemicals with known biological activities and found that a combination of 2C (SB431542 and Baricitinib) significantly enhances cardiac reprogramming by GMT. Without Gata4, MT (Mef2c and Tbx5) plus 2C could selectively reprogram cardiac fibroblasts with enhanced efficiency, kinetics and cardiomyocyte function. More importantly, 2C+MYOCD selectively reprograms human cardiac fibroblasts into cardiomyocyte-like cells. 2C enhances cardiac reprogramming by inhibiting Alk5, Tyk2 and downregulating Oas2, Oas3, Serpina3n and Tgfbi. 2C thus enables selective and robust cardiac reprogramming that can greatly facilitate disease modeling in vitro and advance clinical therapeutic heart regeneration in vivo.

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Project description:Growth and expansion of ventricular chambers is essential during cardiogenesis and is achieved by proliferation of cardiac progenitors that are not fully differentiated. Disruption of this process can lead to prenatal lethality. In contrast, adult cardiomyocytes achieve growth through hypertrophy rather than hyperplasia. Although epicardial-derived signals may contribute to the proliferative process in myocytes, the factors and cell types responsible for development of the ventricular myocardial thickness are unclear. Moreover, the function of embryonic cardiac fibroblasts, derived from epicardium, and their secreted factors are largely unknown. Using a novel co-culture system, we found that embryonic cardiac fibroblasts induced proliferation of cardiomyocytes, in contrast to adult cardiac fibroblasts that promoted myocyte hypertrophy. We identified fibronectin, collagen and heparin-binding EGF-like growth factor as embryonic cardiac fibroblast-specific signals that collaboratively promoted cardiomyocyte proliferation in a paracrine fashion. b1 integrin was required for this proliferative response, and ventricular cardiomyocyte-specific deletion of b1 integrin in mice resulted in reduced myocardial proliferation and impaired ventricular compaction. These findings reveal a previously unrecognized paracrine function of embryonic cardiac fibroblasts in regulating cardiomyocyte proliferation. To identify candidate fibroblast-derived factors that promote myocyte proliferation, we isolated RNA from Nkx-YFP+ cardiomyocytes, embryonic cardiac fibroblasts, and adult cardiac fibroblasts and profiled mRNA expressions by microarray analyses. Arrays were performed using Affymetrix mouse Gene 1.0 ST arrays. Analysis was performed on three biological replicates of mouse embyonic cardiomyocytes, fibroblasts and adult cardiac fibroblasts.

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