Mode of Action: Impaired Fetal Leydig Cell Function—Effects on Male Reproductive Development Produced by Certain Phthalate Esters
Bibliographic record
Abstract
Certain phthalate esters (di-2-ethylhexyl; di-n-butyl and butyl benzyl) have profound effects on the developing male reproductive system when administered orally to pregnant experimental animals during a critical window of development. These esters produce a syndrome of adverse effects that are characteristic of a disturbance in androgen-mediated development and include a variety of reproductive tract malformations and effects on developmental phenotypic markers. A testicular dysgenesis syndrome has been proposed to explain the secular increases in a number of human male reproductive deficits, including decreased semen parameters, increased incidence of cryptorchidism and hypospadias (two of the most common human birth defects), and increased incidence of testicular (germ cell derived) cancer. The rodent phthalate data lend support to the hypothesis. This example illustrates a number of points in the use of the Human Relevance Framework. First, chemical agents may have more than one mode of action (MOA): for example, phthalate-induced peroxisome proliferation leading to hepatocarcinogensis, compared with the induction of developmental effects via effects on androgen signaling. Second, the case demonstrates the life-stage sensitivity of the response to these compounds. Third, because humans may be exposed to multiple phthalate esters producing adverse effects on reproductive development, these compounds may be useful in testing the utility of the Human Relevance Framework (HRF) approach for evaluating cumulative and aggregate risk.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".