Effects of Central Sodium On Epithelial Sodium Channels (ENaC) Expression In Rat Brain
Bibliographic record
Abstract
Mineralocorticoid receptors (MR) and ENaC mediate pressor responses to increases of CSF [Na + ]. We evaluated MR‐dependent effects of central sodium on ENaC subunits (α, β ,γ) expression as well as its endogenous regulator, Sgk1. Male Wistar rats were infused icv for 2 weeks with regular or Na + ‐rich artificial CSF (aCSF) with or without spironolactone. Brain areas studied included ependyma of the anteroventral third ventricle, supraoptic nucleus (SON), paraventricular nucleus (PVN) and subfornical organ (SFO). In ependyma, Na + ‐rich aCSF increased expression of the α and β subunits, primarily in the basolateral membrane. Spironolactone did not prevent these changes. In SON, Na + increased expression of mRNA for α and γ subunits without affecting α protein levels, and increased Sgk1 mRNA levels although a decrease in phosphorylated Sgk1 protein (p‐Sgk1) was noted. Spironolactone prevented the increases in mRNA encoding ENaC but not Sgk1. In PVN, Na + decreased the α mRNA but not protein levels, and significantly decreased p‐Sgk1 protein with no change in Sgk1 mRNA. In SFO, Na + only significantly increased γ mRNA. Spironolactone did not prevent the changes in ENaC mRNA in PVN or SFO. Regulation of ENaC and Sgk1 expression in the brain in response to Na + appears quite region specific. Spironolactone prevents only some of the increases in ENaC subunit expression implying that, in addition to aldosterone, other regulators are involved.
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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".