Astrocytes attenuate oligodendrocyte death in vitro through an α<sub>6</sub> integrin‐laminin–dependent mechanism
Bibliographic record
Abstract
Oligodendrocyte (OL) death occurs in many disorders of the CNS, including multiple sclerosis and brain trauma. Factors reported to induce OL death include deprivation of growth factors, elevation of cytokines, oxidative stress, and glutamate excitotoxicity. Because astrocytes produce a large amount of growth factors and antioxidants and are a major source of glutamate uptake, we tested the hypothesis that astrocytes may have a protective role for OL survival. We report that when OLs from the adult mouse brain were initiated into tissue culture, DNA fragmentation and chromatin condensation resulted, indicative of apoptosis. OL death was significantly reduced in coculture with astrocytes, but not with fibroblasts, which provided a similar monolayer of cells as astrocytes. The protection of OL demise by astrocytes was not reproduced by its conditioned medium and was not accounted for by several neurotrophic factors. In contrast, interference with the alpha(6) integrin subunit, but not the alpha(1), alpha(2), alpha(3), alpha(4), alpha(5), or alpha(v) integrin chains, negated astrocyte protection of OLs. Furthermore, a function-blocking antibody to alpha(6)beta(1) integrin reduced the ability of astrocytes to promote OL survival. The extracellular matrix ligand for alpha(6)beta(1) is laminin, which is expressed by astrocytes. Significantly, neutralizing antibodies to laminin-2 and laminin-5 inhibited the astrocyte mediation of OL survival. These results implicate astrocytes in promoting OL survival through a mechanism involving the interaction of alpha(6)beta(1) integrin on OLs with laminin on astrocytes. Enhancing this interaction may provide for OL survival in neurological injury.
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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) | 0.001 | 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 | 0.001 |
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".