Role of Neuropeptide Y in the Regulation of Tyrosine Hydroxylase Gene Expression in Rat Adrenal Glands
Bibliographic record
Abstract
It is well known that the adrenal medulla contains high concentrations of neuropeptide Y (NPY) where it coexists with epinephrine and norepinephrine. In order to evaluate the possible involvement of NPY in the regulation of the chromafin cells of the rat adrenal medulla, we have studied the effects of NPY and some NPY analogs on the concentrations of tyrosine hydroxylase (TH) mRNA. The following peptides, NPY, PYY, [Leu31, Pro34]-NPY (a Y1 receptor agonist) and NPY13-36 (a Y2 receptor agonist) were administered intravenously at the dose of 40 micrograms/100 g body weight. All the animals were perfused with 4% paraformaldehyde 4 h after injection and cryostat sections of adrenals were processed for in situ hybridization using a 35S-labelled oligonucleotide probe encoding for rat TH. Optical density measurements performed in adrenal medulla demonstrated that the administration of NPY, PYY, and [Leu31, Pro34]-NPY induced a marked increase in the hybridization signal while the Y2 receptor agonist NPY13-36 did not affect TH mRNA levels. Then, these data clearly indicate that NPY positively regulates the genetic expression of TH probably via the Y1 NPY receptor subtype. They suggest that variations in the levels of circulating NPY or in the release of NPY by the chromaffin cells themselves (in autocrine and/or paracrine way) can increase the biosynthesis of catecholamines in rat adrenals.
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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 | 0.000 |
| 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) | 0.000 | 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".