Pioglitazone‐induced sodium retention in rat is independent of alpha subunit of epithelial sodium channel (ENaCá) expression in distal nephron
Bibliographic record
Abstract
We studied the role of ENaC-alpha in renal sodium retention induced by pioglitazone (PGZ), a thiazolidinedione hypoglycemic agent. Male Sprague-Dawley rats in metabolic balance cages were fed on a 1% NaCl diet (control group) and the experimental group received the same diet plus PGZ (40 mg/kg bw/day for 5 days). To suppress aldosterone production, rats were fed on a 3% NaCl diet with or without PGZ. To further suppress aldosterone production, enalapril (25 mg/kg bw/day) was added to olmesartan (15 mg/kg bw/day). Western blotting of the membrane-enriched fractions from the renal cortex and medulla was performed and ENaCα density normalized to beta-actin measured. PGZ treatment led to sodium retention. In 4 control rats on a 1% NaCl diet, ENaCα expression was 0.54±0.02 in the medulla, similar to 0.60±0.04 in 4 PGZ-treated rats, and was 0.68±0.11 in the cortex in PGZ-treated rats, similar to 0.75±0.16 in the control rats. In the rats fed on a 3% NaCl diet, the ENaCα expression was similar in PGZ-treated and control rats both in the medulla and cortex. In PGZ-treated rats receiving a 3% NaCl diet, enalapril and olmesartan, ENaCα expression in the medulla and cortex was also similar in PGZ-treated and control rats. These results show that sodium retention induced by PGZ is independent of ENaCα expression in the apical membrane of the distal nephron, a finding also extended to the situations where aldosterone production is suppressed. Research support: institutional research fund
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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 | 0.000 |
| 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".