Abstract MP215: Endothelial Colony Forming Cell Derived Exosomes Promote Angiogenesis And Cardiac Repair Post Myocardial Infarction
Bibliographic record
Abstract
Background: Despite improvements in therapeutics, ischemic heart disease remains a leading cause of death. Cardiac remodeling after myocardial infarction (MI), predominantly due to loss of cardiomyocytes and coronary vasculature, leads to a progressive decline in cardiac function resulting in heart failure. Current therapies for cardiac repair and heart failure are of limited benefit. Cell transplantation therapy upon MI is a very promising therapeutic strategy to replace dead myocardium, reducing scarring and improving cardiac performance. Methods and Results: Our research focuses on endothelial colony-forming cell-derived exosomes (ECFC-exosomes), which are actively secreted endocytic nanovesicles (30-100 nm) that transport functional miRNAs, proteins, mRNAs, and lipids, playing a key role in paracrine intercellular communication. We identified a novel ability of ECFC-exosomes to promote angiogenesis and cardiac tissue repair. Administration of ECFCs to mice following experimental end-organ ischemia resulted in ECFC-exosome-dependent increase in angiogenesis. ECFC-derived exosomes were taken up by endothelial cells leading to their proliferation and migration, tube formation, and formation of new vessels. Administration of ECFC-exosome to a murine model of MI prevented cardiac remodeling and heart failure. The acute MI resulted in severely decreased left ventricle ejection fraction (Sham 71.2% ± 5 .87, MI+Saline 32.9% ± 2.32) and fractional shortening (Sham 29.5% ± 3.20, MI+Saline 13.6% ± 2.87), and the administration of ECFC-exosomes prevented MI-induced cardiac dysfunction (ejection fraction: MI+ECFC-Exo 64.3% ± 8.74; fractional shortening: MI+ECFC-Exo: 26.4% ± 3.13). Next generation sequencing and bioinformatics analyses identified 136 miRNAs present in ECFC-exosome cargo, and factor inhibiting HIF-1α and PTEN as their potential targets in endothelial cells. Increased nuclear HIF-1α levels in response to ECFC-exosome administration, which may aid in the transcriptional function of HIF-1α, corroborated the role of exosomal miRNA in myocardial angiogenesis. We also found decreased levels of PTEN in response to ECFC-exosome treatment, which is a key negative regulator of PI3K/Akt pathways, survival pathways of heart. We also identified the relative angiogenesis expression profile of the peri-infarcted area in response to ECFC-exosome treatment. The ECFC-exosome administration upregulated the levels of VEGF, IGFBP-1 and PDGF, among others proangiogenic factors, and downregulated the levels of angiostatic factors as IP-10 and Thrombospondin-2. Conclusion: Our findings support the view that the ECFC-exosomes represent a novel therapeutic approach to improve cardiac repair after MI.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".