Abstract 20069: Serum-Free Culture Conditions Support Human Cardiac Stem Cell Outgrowth
Bibliographic record
Abstract
Introduction: Autologous cardiac stem cell (CSC) therapies represent an emerging treatment option for patients with congestive heart failure. Unfortunately, straightforward translation to the clinic is limited by traditional culture conditions that are supplemented by ill-defined or xenobiotic components such as fetal bovine serum. As such, overcoming these barriers is the next critical step in developing next generation CSC therapies for clinical use. Methods/Results: Transition of CSC culture methods to serum-free, xeno-free culture conditions demonstrated negligible effects on the overall numbers of cells cultured with equivalent cardiac (c-Kit+; 7.8±0.2 %, p=0.34) and mesenchymal (CD90+; 32±7 %, p=0.57) progenitor content as compared to standard culture conditions. Flow cytometry morphometry demonstrated that serum free cells provide a smaller, more homogeneous cell product. Exposure to hypoxic stress conditions demonstrated equivalent secretion of SDF-1α, SCF, HGF, and VEGF-A with reduced production of the pro-inflammatory cytokine IL-6 from serum-free cells (7±2 fold less; p=0.005). Despite differences in cytokine production, conditioned media from serum-free CSCs promoted similar new vessel formation (37±5 vs. 41±7 % of positive control within a HUVEC tube formation assay; p=0.69) and circulating stem cell recruitment (39±9 vs. 47±12% of the positive control within a transwell assay, p=0.64) when compared to media conditioned by standard cultures. Storage of cell suspensions at 4°C had negligible effects on 12 hour viability (95.3±1.6%, p=0.50), suggesting a shelf life sufficient for transport between institutions. Finally, injection of CSCs through a clinically approved coronary artery perfusion catheter did not alter cell viability (99.2±1.7 % after delivery, p=0.77) while ensuring successful product delivery to the peri-infarct zone. Conclusions: Transitioning CSCs to clinically acceptable protocols provides a more uniform cell product ready for clinical delivery. These findings represent the first published evidence that altered serum-free xeno-free culture conditions can provide a superior CSC cell product with the potential for ready translation to clinical use.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.009 | 0.003 |
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".