Circadian Regulation of Electrolyte and Water Transport in the Rat Kidney
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Bibliographic record
Abstract
.Circadian oscillations have been reported in major renal functions such as renal blood flow, glomerular filtration rate, and urinary excretion. These oscillations can be explained, in part, by the rhythmic variations in renal transporter expressions. However, given that a multitude of renal transporters are regulated by the circadian clock, and that the functions of some of these transporters are coupled, the underlying mechanisms that link variations in transporter expression to the observed changes in kidney function have yet to be fully elucidated. To better understand the impact of the circadian clock on renal solute and water transport, we have developed a computational model of the epithelial transport of the rat kidney that represents the observed rhythmic variations in glomerular filtration rate (GFR) and in the activities of Na+/H+ exchanger 3, sodium-gLucose cotransporter 1, epithelial Na+ channels, pendrin, and renal outer-medullary K+ channels. The model predicts the rhythmic oscillations in GFR and key renal transporter activities give rise to a significant shift in transport loads among different nephron segments. Together, these oscillations yield 3-4-fold daily fluctuations in urine output and urinary electrolyte excretion rates.Keywordsclockmathematical modelrenal transportMSC codes37M0592-1092C3092C42
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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 it