Effects of human milk and formula on the transcriptional regulation of cytochrome P450 3A4 in HepG2 cells
Bibliographic record
Abstract
Caffeine is eliminated nearly 3-fold faster in formula-fed infants. As cytochrome P450 3A4 (CYP3A4) is a major caffeine metabolizer and as its expression is primarily regulated by the human pregnane X receptor (hPXR), we postulate that formula induces CYP3A4 expression through hPXR activation. The human liver-derived cell line, HepG2, was tested for CYP3A4 mRNA expression after incubation with undigested human milk and formula. A reporter construct containing CYP3A4-PXR binding elements were transfected into HepG2 cells and examined for activation by milk. CYP3A4 mRNA was increased 2--3 fold and reporter activity was mildly induced after all milk treatments. hPXR expression plasmid co-transfection modestly augmented reporter activity only with bovine-based formula. These results suggest that CYP3A4 induction by formula does not account for differences in caffeine elimination between breastfed and formula-fed infants. Furthermore, PXR-mediated regulation most likely does not play a major role in the transcriptional induction of CYP3A4 by milk.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".