Differential Changes in Dopamine D<sub>2</sub>- and D<sub>1</sub>-Receptor mRNA Levels Induced by Hypoxia in the Arterial Chemoreflex Pathway Organs in One-Day-Old and Adult Rabbits
Bibliographic record
Abstract
This study determined: (1) whether dopamine (DA) D<sub>2</sub>-receptor (R) and D<sub>1</sub>-R mRNA levels in the carotid body (CB), petrosal ganglion (PG) and superior cervical ganglion (SCG) are modulated by hypoxia; (2) the role of hypoxia intensity and exposure duration, and (3) whether the pattern of modulation differs between newborn (1-day-old) and adult rabbits. Rabbits were exposed to five F<sub>i</sub>O<sub>2</sub> conditions: 21% (control); 15%/6 h; 15%/24 h; 8%/6 h and 8%/24 h. D<sub>2</sub>- and D<sub>1</sub>-R mRNA expression levels were calculated for each hypoxia condition relative to control using RT-PCR analysis. In the CB of 1-day-old rabbits, D<sub>2</sub>- and D<sub>1</sub>-R transcript levels increased and decreased after exposure to 15 and 8% O<sub>2</sub>, respectively. In the adult CB, D<sub>2</sub>- and D<sub>1</sub>-R transcript levels decreased independently of hypoxia intensities. Only changes in D<sub>1</sub>-R mRNA levels were dependent on exposure time. In the PG, both hypoxia intensities decreased the D<sub>2</sub>-R transcript levels in 1-day-old and adult rabbits; but for the D<sub>1</sub>-R mRNA levels, hypoxia decreased its level in 1-day-old rabbits and increased it in adults regardless of exposure duration. In the SCG, hypoxia had no determinant effect on the D<sub>2</sub>-R mRNA levels either in newborn or adult rabbits while it induced a decrease of D<sub>1</sub>-R transcript levels in 1-day-old rabbits and an increase in adult rabbits. It is concluded that hypoxia affects DA D<sub>2</sub>- or D<sub>1</sub>-R mRNA levels in the chemoreflex pathway in an age-dependent and site-specific manner.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".