Regulation of the Pathological Vasculature of Malignant Astrocytomas by Angiopoietin-1
Bibliographic record
Abstract
Malignant astrocytomas are the most common and highly vascularized of all primary adult brain tumors. The histopathological hallmarks of malignant astrocytomas are microvascular proliferation and formation of vascular entities, which are referred to as "glomeruloid bodies." The significance of glomeruloid bodies and the molecular mechanisms driving the abnormal vascular architecture in malignant astrocytomas are not understood. We have observed that overexpression of angiopoietin-1 (Ang1) in both subcutaneous and intracranial xenograft models of malignant astrocytomas reproduces many of the vascular features of these tumors, including glomeruloid bodies. To confirm that the formation of glomeruloid bodies was directly dependent on Ang1, we performed experiments where levels of Ang1 expression were regulated under tetracycline control, and we found a direct correlation between levels of Ang1 expression and the occurrence of glomeruloid bodies in xenografts. Additionally, we inhibited the action of Ang1 by blocking its cognate receptor Tie2, and we found that the formation of glomeruloid bodies was inhibited. Collectively, these results support our hypothesis that Ang1 is a key molecular regulator of pathological vascularization characteristic of malignant astrocytomas.
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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) | 0.000 | 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 | 0.000 |
| 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".