Name: Screening in Human Cardiac Organoids Identifies a Critical Role for the Mevalonate Pathway in Cardiomyocyte Proliferation
Keywords: Cardiac organoids

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Screening in Human Cardiac Organoids Identifies a Critical Role for the Mevalonate Pathway in Cardiomyocyte Proliferation

ABSTRACT: Re-induction of endogenous proliferation is a promising regeneration strategy for post-mitotic organs. For heart regeneration, we recently discovered that dual inhibition of both GSK3 and MST1 is required for proliferation in mature human cardiac organoids1. However, the mechanisms of action are not yet understood. Here, we de-convolute the mitogenic response using proteomics and report that GSK3 inhibition activates a cell cycle network whereas MST1 inhibition drives the mevalonate pathway. Screening of an additional 105 compounds identified a p38 inhibitor, which activated a cell cycle network, as well as an inhibitor of TGFBR, which activated the mevalonate pathway; combinatorial treatment with these two inhibitors also resulted in synergistic cell cycle activation. The mevalonate pathway which was consistently activated under the most robust proliferative conditions, is down-regulated during in vivo maturation when cardiomyocyte regenerative capacity ceases and inhibition of the mevalonate pathway abolished the myocyte proliferative response to mitogens. Taken together, our findings suggest that the mevalonate pathway synergises with mitogenic agents to enable mature cardiomyocytes to re-enter the cell cycle. These findings have important ramifications for development of cardiac regenerative therapeutics.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cardiac Muscle Cell Line, Cardiac Muscle Tissue

SUBMITTER: Benjamin Parker

LAB HEAD: Benjamin Parker

PROVIDER: PXD009133 | Pride | 2019-03-12

REPOSITORIES: Pride

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Project description:Purpose: Induction of endogenous proliferation is a promising strategy for cardiac regeneration. We find that GSK3 inhibition activates a cell cycle network whereas MST1 inhibition drives the mevalonate pathway, with synergistic activation of proliferation. However, all GSK3 inhibitors tested also reduce contractile force in hCO. We screened for small molecule activators of cardiomyocyte proliferation that did not alter contractile force in hCOs. This was overcome by screening of a boutique compound library, identifying a p38 inhibitor, which activated a cell cycle network without reducing force. The screen also identified a TGFBR inhibitor that induces the mevalonate pathway and can also synergise to activate proliferation. RNA sequencing was performed to investigate underlying mechanisms of action. Methods: RNA samples were processed with Illumina TruSeq Stranded mRNA Library prep kit selecting for poly(A) taled RNA following the manufacturer’s recommendations. Libraries were quantified with Qubit HS (ThermoFisher) and Fragment Analyzer (Advances Analytical Technologies) adjusted to the appropriate concentration for sequencing. Indexed libraries were pooled and sequenced at a final concentration of 1.8 pM on an Illumina NextSeq 500 high-output run using paired-end chemistry with 75 bp read length. The sequencing data was demultiplexed using Illumina bcl2fastq2-v2.17. The quality of the reads was assessed thanks to FastQC. The reads were then processed and mapped to the human genome hg38 using the Bcbio-nextgen framework version 1.0.3. The aligner used was HISAT2 2.0.5. Raw counts were normalised and analysed with DESeq2. Results: Analysis of RNAseq data lead to the understanding that compound 3 regulated the cell cycle network, which was similar to GSK3 inhibitors, whereas compound 65 regulated the mevalonate network, which was similarly to MST1 inhibitors. Conclusions: The current study adds to a growing body of evidence that alterations in cardiomyocyte metabolism may be a cause rather than a consequence of cardiomyocyte cell cycle arrest. Controlling cellular metabolism is emerging as a key strategy in the fight against cancer but the same pathways may conversely be required for the development of cardiac regenerative therapies.

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Screening in Human Cardiac Organoids Identifies a Critical Role for the Mevalonate Pathway in Cardiomyocyte Proliferation

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