Extensive regenerative plasticity among adult NG2-glia populations is exclusively based on self-renewal
Bibliographic record
Abstract
NG2-glia are known to proliferate in the adult brain, however the extent of their mitotic and regenerative capacity and particularly their adult origin is uncertain. By employing a paradigm of mitotic blockade in conjunction with genetic fate tracing we demonstrate that intracerebroventricular mitotic blocker infusion leads to wide-spread and complete ablation of NG2-glial cells in the hypothalamus and other periventricular brain regions. However, despite the extensive glia loss, parenchymal NG2-glia coverage is fully restored to pretreatment levels within two weeks. We further reveal that in response to mitotic blocker treatment, NG2-glia bordering the ablated territories start to express the stem cell marker nestin, divide and migrate to replace the lost cells. Importantly, the migration front of repopulating NG2-glia invariably proceeds from the distal parenchyma towards the ventricles, ruling out contributions of the subventricular zone neurogenic niche or the corresponding area of the third ventricle as source of new NG2-glia. NG2-CreER-based fate tracing further substantiates that NG2-glia which have been spared from mitotic blockade are the sole source of regenerating NG2-glia. Collectively, our data reveals that all adult NG2-glia retain the ability to divide and that they are capable of fully restoring parenchymal NG2-glia coverage after wide-spread NG2 cell loss, indicating complete self-sufficiency in maintaining NG2-glia population levels in the adult brain.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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 | 0.001 |
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".