The effect of integrin a1b1 on Smad2/3 and phosphoSmad2/3 expression in murine chondrocytes
Bibliographic record
Abstract
Background: Chondrocytes, the cells of cartilage, maintain and repair the extracellularmatrix by secreting and degrading proteins such as collagen type II andaggrecan.1 Integrins are transmembrane adhesion proteins that cells use to both bindto and sense the extracellular matrix. Chondrocytes express many different types ofintegrin molecules and this study focuses on the collagen II and VI receptor integrina1b1. Transforming growth factor-beta (TGF-b) stimulates chondrocytes to repaircartilage through a number of intracellular pathways of which the Smad2/3 pathwayis a known major fibrotic pathway.2 An excess build-up of bony tissue leads to theformation of fibrotic osteoarthritis (OA) in integrin a1-null mice at an earlier age andto a more severe extent than wild type controls.3 Based on these data we hypothesizethat integrin a1b1 controls the sensitivity of chondrocytes to TGF-b. When integrina1b1 is missing chondrocytes are oversensitive to TGF-b, possibly through Smad2/3pathway up regulation. The objective of this experiment is to measure the proteinlevels of Smad2/3 and phosphoSmad2/3 in wild type and integrin a1-null murinechondrocytes. We expect up regulation of phosphoSmad2/3 in integrin a1-null micecompared to wild-type controls.3Methods: Enzymatically isolated chondrocytes from 4-6 month old mice weresonicated and the released protein concentrated through centrifugal filtration. Proteinwas measured through Western-blotting analysis.Results: Integrin a1-null murine chondrocytes contain Smad2.Discussion: Smad2 has been shown in wild-type chondrocytes, but not previously inintegrin a1-null chondrocytes.4 However, Smad2/3 and up-regulated phosphoSmad2/3have been found in integrin a1-null renal medulla cells.2 With further development oftechniques, Smad3 and phosphoSmad2/3 will be measured in wild-type and integrina1-null murine chondrocytes and thus the pathway for fibrotic OA in integrin a1-nullmice can be further determined.
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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 | 0.003 | 0.001 |
| 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 | 0.001 |
| 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".