The Identification and Characterization of Zebrafish Mast Cells.
Bibliographic record
Abstract
Abstract Mast cells (MCs), tissue counterparts to mammalian basophils, are known for their role in allergic reactions, inflammation and cancer progression, yet their developmental origin remains controversial due to limitations studying these cells in traditional animal models. The zebrafish provides a highly efficient system for studying vertebrate MC development. All other major hematopoietic lineages have zebrafish counterparts and the fundamental genetic mechanisms controlling hematopoiesis are well conserved. We are the first to identify zebrafish MCs in the gill and intestine. These cells demonstrate classic MC phenotypes including prominent metachromatic granules following staining with toluidine blue and positive immunohistochemical reactions to antibodies against human tryptase and C-KIT. Electron microscopy demonstrates a striking morphologic resemblance to mammalian MCs. Functional studies using the stimulating agent, Compound 48/80 or formalin-killed Aeromonas result in MC degranulation and increased blood levels of key mediators, such as tryptase. These cells also express carboxypeptidase A5 (cpa5), a zebrafish homologue of the human mast cell-specific CPA enzymes. Cpa5 expression in zebrafish embryonic blood cells begins at 24 hours post fertilization and co-localizes with a number of established granulocytic and monocytic markers suggesting that MCs arise from a common granulocyte/monocyte progenitor. Morpholino knockdown studies have demonstrated that the transcription factors gata-2 and pu.1, but not gata-1 are necessary for early MC development. Interestingly, friend of gata-1 (fog-1) may also be required, but in a gata-1 dependent manner. Ongoing morpholino and mutant rescue studies will further establish in vivo the contribution that these transcription factors make to vertebrate MC development. Finally, we have cloned a cpa5 promoter element and shown it can drive expression of the green fluorescent protein in early zebrafish MCs providing a means for generating transgenic zebrafish lines to model human MC diseases for use in high throughput small molecule modifier screens.
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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".