Rapid de-esterification and loss of eicosapentaenoic acid from rat brain phospholipids: an intracerebroventricular study
Bibliographic record
Abstract
Eicosapentaenoic acid (EPA, 20:5n-3) is being explored as a therapy in neurological diseases and disorders. Although it is known that palmitate is the most abundant fatty acid in the brain while EPA is one of the lowest, the mechanism by which the brain maintains this balance is unclear. Therefore, to trace the metabolism of these fatty acids in the brain, (14) C-palmitate or (14) C-EPA was administered via intracerebroventricular infusion to rats. From 4 to 128 days post-infusion, brains were collected after head-focused, high-energy microwave irradiation for biochemical analysis. At day 4 post-infusion, 57% (82 ± 26 nCi) of the total phospholipid radioactivity in (14) C-palmitate-infused brains was intact palmitate; whereas in (14) C-EPA-infused brains, 9% (2 ± 0.9 nCi) of the radioactivity was intact EPA. The half-life of esterified (14) C-palmitate and (14) C-EPA was 32 ± 4 (2% loss per day) and 5 ± 0.2 days (14% loss per day), respectively. Radioactivity was also detected in other saturates, monounsaturates, and cholesterol, suggesting that the infused radiolabeled fatty acids were β-oxidized. In conclusion, the low concentration of EPA in brain phospholipids may be the result of extensive metabolism of EPA, in part by β-oxidation, upon entry into the brain and upon de-esterification from phospholipids.
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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) | 0.000 | 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 | 0.001 |
| 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".