Brief multi‐drug treatment via a wearable silk‐hydrogel bioreactor induces long‐term limb re‐patterning and regeneration in adult <i>Xenopus Laevis</i>
Bibliographic record
Abstract
Limb regeneration requires the temporal and spatial patterning of molecular signals within a suitable microenvironment such that differentiation and growth can be orchestrated. Despite advances in limb prostheses, ideal solutions to limb loss will involve re‐structuring native tissues to regain biological function. Our novel biomedical engineering approach was designed to induce patterning by controlling the microenvironment at the wound site in amputated hindlimbs of Xenopus laevis, without having to micromanage every molecular cascade. Post‐metamorphic, non‐regenerative frogs which had undergone hindlimb amputation were treated with an innovative wearable bioreactor composed of a silk‐hydrogel infused with 5 pro‐regenerative compounds for only 24 hours. Animals were maintained for 18 months where morphometric and histological analyses were performed at regular intervals to monitor neural, vascular, and osseous repatterning. The 24‐hr. brief exposure to the bioreactor induced remarkable growth with patterned structures not observed in untreated controls. Bone remodelling, re‐vascularization, and digit patterning were observed 18 months after the initial 24 hour bioreactor treatment. 18‐month post treatment regenerates also regained sensorimotor abilities within the regenerated hindlimb. Whole transcriptomic analysis at early regenerative periods confirmed changes to blastemal profiles related only to drug‐reactor exposures, which included changes in differential gene expression profiles related to crucial pro‐regenerative mechanisms such as sox2, KLf4, WNT pathway genes and upregulation of pro‐regenerative inflammatory and neural pathways. Our data provide strong evidence that a non‐regenerative animal can be induced to re‐pattern limbs when exposed to a controlled bioreactor device. This first induction of an advanced limb regenerative response in fully adult organisms suggests using a biomedical engineering approach with silk‐hydrogel as a bioreactor for simultaneous and compound delivery of multiple drug compounds is a promising avenue for induction of regeneration in adult, non‐ regenerative species.
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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 | 0.000 | 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".