Effects of Sex Hormones on the Pineal Response to Isoproterenol and on Pineal Beta-Adrenergic Receptors
Bibliographic record
Abstract
Several studies have shown sex hormone effects on pineal function. In order to clarify the role of adrenergic mechanisms in these effects, we investigated the pineal response to adrenergic stimulation and pineal beta-adrenergic receptors following castration and/or sex hormone treatment in 2-month-old male and female Sprague-Dawley rats. The urinary 6-sulphatoxymelatonin (aMT6s) response to isoproterenol (ISO) was compared in castrated and sham-operated animals. Ovariectomy caused an increase and orchiectomy a decrease in ISO-induced urinary aMT6s excretion. The melatonin response to ISO was examined in pineal glands and serum samples obtained from castrated, sex-hormone-treated castrated and sham-operated rats. Consistently, ovariectomy increased pineal and serum melatonin responses to ISO, while orchiectomy decreased the responses; oestradiol and testosterone treatments, respectively, reversed these effects. 3H-dihydroalprenolol binding was measured in single pineal glands from castrated, sex-hormone-treated castrated and sham-operated rats. Ovariectomy increased the density of beta-adrenoceptors, whereas orchiectomy decreased the density; oestradiol and testosterone replacement, respectively, blocked these effects. No significant effect on receptor Kd values was found. These data suggest that sex hormones regulate pineal melatonin production by modifying beta-adrenergic mechanisms.
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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 | 0.000 | 0.001 |
| 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 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".