Abstract 192: Histological and Functional Assessment of Human Placental Stem Cells in an Induced Myocardial Infarction in Rats
Bibliographic record
Abstract
Purpose: Human bone marrow mesenchymal stem cells (hbmMSCs) have been studied extensively for myocardial regenerative therapy. However, such cells require invasive procreation and suffer from donor age-related declining quality. Recently, a more abundant resource of young MSCs has been isolated from an otherwise discarded organ: the human placenta mesenchymal stem cells (hpMSCs). In this study, we wanted to examine the survival, differentiation, and functionality of xenogeneic hpMSCs when implanted into an induced myocardial rat infarction. Methods: To inspect their stemness,hpMSCs underwent an In Vitro cardiac cell differentiation in a DMEM medium containing 5 Azacytidine. Additionally, hpMSCs were tested in a myocardial infarction animal model. Female Lewis rats (40 animals) underwent left coronary artery ligation. Animals were divided into 4 groups. Group 1 was injected with hpMSCs in the peri-infarct region. Groups 2 and 3 received hbmMSCs and In Vitro differentiated hbmMSCs into cardiomyocytes respectively. Cell free medium was injected in group 4. Echocardiography was performed at baseline, day 4, weeks 3, 6, and 9 after ligation. Myocardial tissues were harvested and studied immunohistochemically for specific muscular and cardiac markers (Actin and Troponin I) on weeks 6 and 10. Results: In Vitro differentiation into cardiomyocyte lineage was achieved with the hpMSCs. HpMSCs were detected within rat myocardium by week 6 after their implantation. These cells stained positively for Actin and Troponin I. Preliminary echocardiographic data show cardiac functional increase in group 1. Whether hpMSCs can provide a superior effect than hbmMSCs or differentiated hbmMSCs is being investigated. Conclusions: In Vitro studies indicated that the hpMSCs can be differentiated into cardiac cells. When implanted into the rat infarcted myocardium, hpMSCs survived and were able to differentiate into cardiomyocytes. These cells appeared to increase cardiac function in an induced myocardial infarction rat model. With the advantages of easy availability and young age, hpMSCs could be more suitable for myocardial regenerative therapy.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.004 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".