Dataset Information

CRISPR-Cas9 Editing of TLR4 Improves the Outcome of Cardiac Cell Therapy

ABSTRACT: We developed and optimized a new electroporation protocol for CRISPR-Cas9 gene editing. This protocol achieved up to 68% success rate, when applied to isolated hMSCs from the heart and epicardial fat of patients with ischemic heart disease. While cell editing resulted lowered TLR4 expression in hMSCs, it did not affect classical markers of hMSCs and proliferation rate. Advanced protein mass spectrometry analysis revealed that edited cells secreted fewer proteins involved in inflammation and in extracellular matrix organization. The immunomodulatory effect of TLR4 editing was apparent in both free and EV-encapsulated proteins. Furthermore, edited cells expressed less NF-ƙB and secreted lower amounts of extracellular vesicles, pro-inflammatory and pro-fibrotic cytokines than unedited hMSCs. Cell therapy with edited and unedited hMSCs improved survival, left ventricular (LV) remodeling, and cardiac function after myocardial infarction (MI) in mice. Postmortem histologic analysis revealed clusters of edited cells that survived in the scar tissue 28 days after MI. Morphometric analysis showed that implantation of edited cells increased the area of myocardial islands in the scar tissue, reduced the occurrence of transmural scar, increased scar thickness, and markedly decreased expansion index, compared with unedited cells or saline.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Suspension Culture

SUBMITTER: Tamar Ziv

LAB HEAD: Jonathan Leor

PROVIDER: PXD033253 | Pride | 2023-05-10

REPOSITORIES: Pride

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CRISPR-Cas9 editing of TLR4 to improve the outcome of cardiac cell therapy.

Schary Yeshai Y Rotem Itai I Caller Tal T Lewis Nir N Shaihov-Teper Olga O Brzezinski Rafael Y RY Lendengolts Daria D Raanani Ehud E Sternik Leonid L Naftali-Shani Nili N Leor Jonathan J

Scientific reports 20230318 1

Inflammation and fibrosis limit the reparative properties of human mesenchymal stromal cells (hMSCs). We hypothesized that disrupting the toll-like receptor 4 (TLR4) gene would switch hMSCs toward a reparative phenotype and improve the outcome of cell therapy for infarct repair. We developed and optimized an improved electroporation protocol for CRISPR-Cas9 gene editing. This protocol achieved a 68% success rate when applied to isolated hMSCs from the heart and epicardial fat of patients with is ...[more]

PMID: 36934130

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Project description:Myocardial infarction (MI) is a sterile inflammatory condition that results in the activation of T- cells targeting cardiac antigens. T-cells have been shown to contribute to reparative and maladaptive remodeling post-MI. However, the differentiation trajectories and in situ activity of heart-specific CD4+T cells and the effect of distinct T-cell phenotypes on MI repair remains poorly understood. Herein, we combined T-cell receptor transgenic models and tetramer staining targeting myocardial protein with single-cell transcriptomics (scRNAseq) and functional phenotyping to elucidate how the myosin-specific CD4+ T cells (TCR-M) differentiate in the murine infarcted myocardium and influence tissue repair. Furthermore, we transferred pro-inflammatory versus regulatory pre-differentiated heart-specific T-cells to dissect how they differentially regulate post-myocardial infarction (MI) inflammation. Flow cytometry and scRNAseq findings reveled that transferred TCR-M cells acquired an induced regulatory phenotype (iTreg) in the infarcted myocardium and blunt local inflammation. Myocardial TCR-M cells differentiated into two main lineages enriched with cell activation and pro-fibrotic transcripts (e.g. Tgfb1) or with suppressor immune checkpoints (e.g. Pdcd1), which we also found in human myocardial tissue. These cells produced high levels of latency-associated peptide (LAP) and inhibited interleukine-17 (IL-17) responses. Tetramer staining further identified endogenous myosin-specific T-cells that acquired a regulatory phenotype in the heart post-MI. Notably, TCR-M cells that were pre-differentiated in vitro towards a regulatory phenotype maintained a stable in vivo FOXP3 expression and anti-inflammatory activity whereas TH17 partially converted towards a regulatory phenotype in the injured myocardium, which was associated to blunted myocardial inflammation. Moreover, myocardial scar of Treg TCR-M transferred mice showed blunted inflammatory transcripts and enrichment for growth factors supporting fibroblasts and endothelial cells.

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