Development and Characterization of a Novel, Graded Model of Clip Compressive Spinal Cord Injury in the Mouse: Part 2. Quantitative Neuroanatomical Assessment and Analysis of the Relationships between Axonal Tracts, Residual Tissue, and Locomotor Recovery
Bibliographic record
Abstract
A detailed examination of the histopathological features of the clip compression injury in mice was performed to understand the relationships between neurological function and existing pathology of the spinal cord. Adult, female CD1 mice underwent three grades of extradural clip compression injury (3-g, 8-g, and 24-g FEJOTA mouse clips), transection, and sham injury at T3-4. Quantitative behavioural assessments were performed for 4 weeks following SCI. After 4 weeks, Fluoro-Gold was introduced caudal to the SCI site, at T9, and was retrogradely transported for 5 days to the origin of spared axons through the injury site. Counts of retrogradely labeled neurons in the brain-stem, midbrain, and sensory-motor cortex indicated that the number of intact descending axons that traversed the lesion decreased with increasing injury severity (F > 28; df = 4; p < 0.0001; one-way ANOVA). Independent linear correlation analyses were performed between indices of neurological recovery (BBB and IP test), counts of retrogradely labeled neurons and morphometric assessments of normal residual tissue at the injury epicenter. The BBB test correlated strongly with the amount of residual tissue at the injury epicenter (R = 0.945, df = 28, p < 0.0001). Counts of neurons retrogradely labeled with Fluoro-Gold were also strongly correlated with the BBB scores. The extrapyramidal (raphespinal, reticulospinal, vestibulospinal, and rubrospinal) tracts had Pearson correlation coefficients (R) of 0.814, 0.812, 0.813, and 0.747, respectively (df = 28, p < 0.0001). The pyramidal (corticospinal) tract had a correlation of R = 0.747, df = 28, p < 0.0001 with the BBB scores. The IP scores also correlated strongly with the persistence of extrapyramidal (raphespinal, reticulospinal, vestibulospinal and rubrospinal) tracts with correlation coefficients of 0.801, 0.782, 0.790, and 0.836, respectively (df = 28, p < 0.0001). These data indicate that the counts of retrogradely labeled neurons at the origin of distinct descending motor pathways are predictors of the variance of the functional recovery measured by the BBB and IP tests following spinal cord injury. In addition, we provide a detailed neuroanatomical study of clip compression injury in mice that can be used to study the molecular mechanisms of SCI in knockout and transgenic mice.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".