Development, characterization, and in vitro evaluation of poly(ethylene oxide)-block-poly(ε-caprolactone)-α-tocopheryl succinate micelles as a novel nanocarrier for rapamycin delivery
Bibliographic record
Abstract
Rapamycin holds significant therapeutic potential for various diseases; however, its clinical application is limited by several formulation challenges, primarily its extremely low aqueous solubility (2.6 μg/mL). To address this, nanoparticle-based delivery systems have emerged as a promising strategy to enhance solubility and enable sustained drug release. Currently, Fyarro® (Aadi Bioscience, Inc.), an albumin-bound nanoparticle formulation, is the only FDA-approved injectable rapamycin product. In this study, we aimed to develop and evaluate novel poly(ethylene oxide)- block -poly(ε-caprolactone)-α-tocopheryl succinate (PEO- b -PCL-α-TS) micelles and assess their potential as a delivery system for rapamycin. PEO- b -PCL copolymers with varying PCL/PEO ratios were prepared via ring-opening polymerization and modified by α-TS conjugation, as confirmed by 1 H NMR, GPC, XRD, DSC analyses. The optimum rapamycin-loaded micelles (PEO 2000 - b -PCL 4000 -α-TS) exhibited nano-sized particles (< 22 nm) with a narrow polydispersity index (<0.29), high drug encapsulation efficiency (≥92 %), and enhanced solubility (>1.3 mg/mL). Stability studies demonstrated that encapsulation protected rapamycin from degradation, maintaining over 90 % drug retention for three months at 4 °C, while in vitro release studies showed sustained release, with 50 % of rapamycin released from PEO 2000 - b -PCL 4000 -α-TS micelles over 72 h. In vitro cytotoxicity assays revealed anticancer activity against lung carcinoma epithelial cells (A549), and the human colon adenocarcinoma cell line (HCT116). Minimal toxicity (≥70 % viability) was observed in normal human fibroblast cells (HFF1). These results point to the potential of PEO- b -PCL-α-TS micelles as a promising nanocarrier system, offering improved rapamycin solubility, enhanced stability, sustained release, and effective anticancer activity.
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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 | 0.002 | 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".