Progressive Brain Damage and Alterations in Dendritic Arborization after Collagenase-Induced Intracerebral Hemorrhage in Rats
Bibliographic record
Abstract
Intracerebral hemorrhage (ICH) was widely believed to be a monophasic event whereby cell death occurs from the initial space-occupying effects of the hematoma. However, we now know that secondary degenerative events contribute to delayed cell death, functional impairment and clinical deterioration. In three experiments, we further characterized the long-term maturation of injury in the collagenase model of striatal ICH in rat. First, we quantified the volume of tissue lost from 7 to 60 days showing that tissue loss more than doubled over this time. As the volume of tissue lost does not distinguish gray from white matter damage, gold chloride staining was used in a second experiment in ICH rats that survived 7 or 60 days. The mid-sagittal area of the corpus callosum significantly declined (22%) over this period, whereas the hippocampal and anterior commissures were not affected. A third experiment used the Golgi-Cox stain to examine dendritic arborization of peri-hematoma and contralateral medium spiny neurons of the striatum. We found an early and sustained increase in dendritic arborization in the non-lesioned hemisphere, whereas there was initial atrophy of peri-hematoma striatal neurons that eventually recovered to normal. These findings show that tissue loss, including white matter atrophy, continues over extended periods after ICH making it a potential target for cytoprotective agents. Finally, the dendritic alterations in both ipsi- and contralateral striatal neurons likely influence spontaneous recovery and are potential targets to further improve it.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| 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".