Articular Cartilage Subpopulations Respond Differently to Cyclic Compression <i>In Vitro</i>
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The inferior biomechanical properties of in vitro-formed tissue remain a significant obstacle in bioengineering articular cartilage tissue. We have previously shown that cyclic compression (30 minutes, 1 kPa, 1 Hz) of chondrocytes isolated from full-thickness cartilage can induce greater matrix synthesis, although articular cartilage is composed of different subpopulations of chondrocytes, and their individual contribution to enhanced tissue formation has not been fully characterized. This study examines the contribution of chondrocyte subpopulations to this response. Bovine articular chondrocytes were isolated from superficial to mid zones (SMZs) or deep zones (DZs), placed in three-dimensional culture, and subjected to cyclic compression. DZ chondrocytes on calcium polyphosphate substrates formed thicker tissue than those from SMZs. Compression increased matrix accumulation in SMZ chondrocytes while decreasing accumulation in DZ chondrocytes. The SMZ and DZ chondrocytes also differed in their type 1 membrane-bound matrix metalloproteinase (MMP) and MMP-13 expression, enzymes that play a crucial role in mediating the response to mechanical stimulation. In addition, the duration of the culture period was important in determining the DZ response, raising the possibility that matrix accumulation plays a role in the response to stimulation. Understanding the cellular response to mechanical stimulation during tissue formation will facilitate our understanding of tissue growth and allow for further optimization of cartilage tissue formation in vitro.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 it