Human Fetal Adenohypophysis: Morphologic and Functional Analysis in vitro
Bibliographic record
Abstract
Pituitaries from 24 human fetuses at 7-20 weeks of gestation were studied in culture to assess hormone release, response to adenohypophysiotropic hormones and cytodifferentiation by electron microscopy in cultures lasting 4-8 days and in some cases up to 28 days. At 7 weeks of gestation, ACTH was released by cultured cells which included recognizable corticotrophs. GH was released by cells cultured from 8- to 9-week fetuses and densely granulated somatotrophs were present in the cultures. alpha-Subunit of glycoprotein hormones was present in cultures from 10-week fetuses and TSH and LH were released from 12-week fetuses. FSH was found in cultures of a 13-week female fetus but not before 14 weeks in cultures from males. The levels of FSH and LH were higher in media from cultures of females than from those of males at all ages from detection to 20 weeks, whereas alpha-subunit was slightly higher in media from males. While cells with features of the glycoprotein hormone cell line were found in cultures from 10-week fetuses, no characteristic thyrotrophs or gonadotrophs were recognized. PRL was not measured in basal incubations before 14 weeks. The amounts of all hormones released were proportional to fetal age and decreased with duration of culture. Cortisol suppressed ACTH release in cultures from 7- to 8-week fetuses. Responsiveness of GH release to GRH/SRIH, of ACTH to CRH, and of FSH to GnRH, was found at 12 weeks; LH stimulation by GnRH and TSH response to TRH were documented at 14 weeks. Increments of gonadotropin release during incubation with GnRH were greater in cultures from females than in those from males. PRL release responded to GRH stimulation and to SRIH inhibition in parallel with GH; this behavior is consistent with production of both hormones by mammosomatotrophs. The onset of hormone release by cultured human fetal pituitaries correlates with the detection of hormones biochemically and immunohistochemically. Responsiveness of fetal adenohypophysial cells to hormonal influences indicates functional maturity early in gestation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".