Coupling of renal sodium and calcium transport: A modeling analysis
Bibliographic record
Abstract
Abstract Calcium (Ca 2+ ) transport along the nephron occurs via specific transcellular and paracellular pathways, and is coupled to the transport of other electrolytes. Notably sodium (Na + ) transport establishes an electrochemical gradient to drive Ca 2+ reabsorption. Hence, alterations in renal Na + handling, under pathophysiological conditions or pharmacological manipulations, can have major effects on Ca 2+ transport. An important class of pharmacological agent is diuretics, which are commonly prescribed for the management of blood pressure and fluid balance. The pharmacological targets of diuretics generally directly facilitate Na + transport, but also indirectly affect renal Ca 2+ handling. To better understand the underlying mechanisms, we have developed a computational model of electrolyte transport along the superficial nephron in the kidney of a male and female rat. Sex differences in renal Ca 2+ handling are represented. Model simulations predict in the female rat nephron lower Ca 2+ reabsorption in the proximal tubule and thick ascending limb, but higher reabsorption in the late distal convoluted tubule and connecting tubule, compared to the male nephron. The male rat kidney model yields a higher urinary calcium excretion than female, consistent with animal experiments. Additionally, we conducted simulations of inhibition of channels and transporters that play a major role in Na + and Ca 2+ transport. Model results indicate that along the proximal tubule and ascending thick ascending limb, Ca 2+ and Na + transport occurs in parallel, but those processes are dissociated in the distal convoluted tubule. Simulations also reveal sex-specific responses to different pharmacological manipulations.
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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 | 0.001 | 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".