Regulation of the Phenylethanolamine N‐methyltransferase Gene in the Spontaneous Hypertensive Rat
Bibliographic record
Abstract
Phenylethanolamine N‐methyltransferase (PNMT) is the enzyme involved in the biosynthesis of the catecholamine, epinephrine. Genetic mapping studies suggest that the PNMT gene is a candidate gene for hypertension. Furthermore, elevated expression of PNMT is correlated with elevated blood pressure in hypertensive rats. However, the mechanism associated with changes in PNMT gene expression is not known. Recent studies have identified key transcriptional regulators of the PNMT gene, which include: Egr‐1, Sp1 and GR. The current study examined the mechanism by which dysregulation of the PNMT gene occurs in a genetic rodent model of hypertension. Results from the current study show that spontaneous hypertensive rats (SHR) have elevated systolic, diastolic and mean arterial blood pressure compared to Wistar‐Kyoto (WKY) rats at 14, 15 and 16 weeks of age. RT‐PCR analysis show that adrenal PNMT mRNA is 1.5‐fold higher in SHR compared to WKY, and have increased levels of transcription factors Egr‐1 (3.2‐fold), Sp1 (3.3‐fold) and GR (1.3‐fold). These results suggest that altered transcriptional activity may be involved in increased PNMT expression associated in the pathophysiology of hypertension.
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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) | 0.001 | 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 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".