Effect of Intestinal Diamine Oxidase (DAO) Depletion by Heparin on Mucosal Polyamine Metabolism
Why this work is in the frame
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Bibliographic record
Abstract
The aim of this study was to examine the relative importance of the enzymes ornithine decarboxylase (ODC) and diamine oxidase (DAO) in intestinal polyamine metabolism in normal rats. To study this we measured jejunal and ileal DAO and ODC activities and polyamine levels 2 h after injecting, in non-fasting male Wistar rats, either normal saline (controls) or a large dose of i.v. heparin to deplete intestinal mucosal DAO stores. We found that heparin significantly reduced mean DAO activity (p less than 0.001). As a result putrescine levels increased significantly in both jejunum (p less than 0.02) and ileum (p less than 0.01). Heparin-induced DAO depletion had no significant effect on spermine and spermidine levels at either site. The increased putrescine was associated with reduced ODC activity in both jejunum (p less than 0.01) and ileum (p less than 0.05). ODC activity correlated negatively with putrescine (p less than 0.001). These results suggest that (i) in normal rats, DAO is more important than ODC in regulating mucosal putrescine levels and (ii) putrescine exerts feedback inhibition of ODC.
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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 it