Cell Deformation and Micromechanical Environment in the Intervertebral Disc
Bibliographic record
Abstract
The purpose of this research was to explore the in situ anatomic and mechanical environment of disc cells. Laser scanning confocal microscopy was used to characterize three-dimensional morphology of intervertebral disc cells, micromechanical deformation and interaction with extracellular matrix, and functional intercellular communication. Bovine coccygeal discs were used for both the anatomic and micromechanical investigations. Anulus fibrosus cells had a complex morphology with sinuous processes woven into the extracellular matrix, particularly in the outer aspect of the anulus where they were also interconnected via functional gap junctions. They were also found in an extensive pericellular matrix of type-VI collagen, joining as many as ten cells into linear cell arrays that could be extracted from the matrix as functional units. Mechanically, collagen fibril sliding was demonstrated to govern cell mechanics and strain transfer in the anulus fibrosus during loading activities. Lamellar cells were largely protected from direct tensile strains in the matrix, with minimal intercellular strains. However, intercellular strains between lamellar cells in adjacent arrays were large, illustrating shearing between linear cell arrays. Appreciable shear was observed across the lamellar cell bodies as well as to the cellular processes woven into the matrix. These findings demonstrated the morphologic and micromechanical complexity of anulus fibrosus cells. The knowledge of the in situ environment of disc cells will provide a base to investigate the mechanical implications of disc degeneration on the cellular environment and to better understand how mechanical and genetic risk factors can impact the cells that are essential to maintaining the intervertebral disc.
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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 | 0.000 | 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) | 0.001 | 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 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".