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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [miRNA-seq]

ABSTRACT: Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [miRNA-seq]

PROVIDER: PRJNA421014 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6345661.fastq.gz	Fastqsanger.gz
	SRR6345662.fastq.gz	Fastqsanger.gz
	SRR6345663.fastq.gz	Fastqsanger.gz

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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration

Project description:Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration

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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [RNA-seq]

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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [miRNA-seq]

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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [RNA-seq]

Project description:Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration [RNA-seq]

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Loss of microRNA-128 promotes cardiomyocyte proliferation and heart regeneration.

Project description:The goal of replenishing the cardiomyocyte (CM) population using regenerative therapies following myocardial infarction (MI) is hampered by the limited regeneration capacity of adult CMs, partially due to their withdrawal from the cell cycle. Here, we show that microRNA-128 (miR-128) is upregulated in CMs during the postnatal switch from proliferation to terminal differentiation. In neonatal mice, cardiac-specific overexpression of miR-128 impairs CM proliferation and cardiac function, while miR-128 deletion extends proliferation of postnatal CMs by enhancing expression of the chromatin modifier SUZ12, which suppresses p27 (cyclin-dependent kinase inhibitor) expression and activates the positive cell cycle regulators Cyclin E and CDK2. Furthermore, deletion of miR-128 promotes cell cycle re-entry of adult CMs, thereby reducing the levels of fibrosis, and attenuating cardiac dysfunction in response to MI. These results suggest that miR-128 serves as a critical regulator of endogenous CM proliferation, and might be a novel therapeutic target for heart repair.

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α-Ketoglutarate Promotes Cardiomyocyte Proliferation and Heart Regeneration after Myocardial Infarction

Project description:The neonatal mammalian heart is capable of substantial regeneration following injury through cardiomyocyte proliferation. However, this regenerative capacity is lost by postnatal (P) day 7. How to stimulate the adult cardiomyocyte to re-enter the cell cycle is still unknown. Accumulating evidence suggests that cardiomyocyte proliferation depends on its metabolic state. Due to the tight connection between the tricarboxylic acid cycle (TCA) and cell proliferation, we analyzed the TCA metabolites between P0.5 and P7 mouse hearts and found that α-ketoglutarate (α-KG) ranked first among the decreased metabolites. The intraperitoneal injection of exogenous α-KG extended the window of cardiomyocyte proliferation during heart development and promoted heart regeneration after myocardial infarction (MI) by inducing adult cardiomyocyte proliferation. This was confirmed in Ogdh-siRNA-treated mice with increased α-KG levels. Mechanistically, α-KG activates Jmjd3, a histone lysine demethylase, that decreases H3K27me3 expression and deposition of H3K4me3 at the promoters of cell cycle and structural maturation genes in cardiomyocytes. Our present study shows that α-KG promotes cardiomyocyte proliferation by Jmjd3-dependent demethylation and inactivation of H3K27me3 andH3K4me3, which is a potential therapeutic approach for treating MI and heart failure.

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