Tumor Necrosis Factorα Modulates Matrix Production and Catabolism in Nucleus Pulposus Tissue
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Bibliographic record
Abstract
In Brief Study Design. This study examines changes in the production of extracellular matrix molecules as well as the induction of tissue degradation in in vitro formed nucleus pulposus (NP) tissues following incubation with tumor necrosis factor (TNF)α. Objective. To characterize the response of NP cells to TNF-α, a proinflammatory cytokine present in herniated NP tissues. Summary of Background Data. TNF-α is a proinflammatory cytokine expressed by NP cells of degenerate intervertebral discs. It is implicated in the pain associated with disc herniation, although its role in intervertebral disc degeneration remains poorly understood. Methods. In vitro formed NP tissues were treated with TNF-α (up to 50 ng/mL) over 48 hours. Tissues were assessed for histologic appearance, proteoglycan and collagen contents, as well as proteoglycan and collagen synthesis. Reverse transcriptase polymerase chain reaction was used to determine the effect of TNF-α on NP cell gene expression. Proteoglycan degradation was assessed by immunoblot analysis. Results. At doses of 1–5 ng/mL, TNF-α induced multiple cellular responses, including: decreased expression of both aggrecan and type II collagen genes; decreases in the accumulation and overall synthesis of aggrecan and collagen; increased expression of MMP-1, MMP-3, MMP-13, ADAM-TS4, and ADAM-TS5; and induction of ADAM-TS dependent proteoglycan degradation. Within 48 hours, these cellular responses resulted in NP tissue with only 25% of its original proteoglycan content. Conclusions. Because low levels of TNF-α, comparable to those present physiologically, induced NP tissue degradation, this suggests that TNF-α may contribute to the degenerative changes that occur in disc disease. This study characterizes the effect of tumor necrosis factor (TNF)α on extracellular matrix production and catabolism by nucleus pulposus cells. Short-term treatment of nucleus pulposus tissue with TNF-α decreased the production of proteoglycans and collagen, and induced aggrecanase-mediated proteoglycan degradation. Our findings suggest that TNF-α may contribute to the degenerative changes in disc disease.
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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