Mechanisms of intrinsic osmolality and sodium detection by magnocellular neurosecretory neurons
Bibliographic record
Abstract
Abstract The maintenance of extracellular fluid (ECF) osmolality and sodium concentration ([Na + ] o ) near optimal “set point” values sustains physiological functions and prevents pathological states such as hypo‐ and hypernatremia. The peptide hormones vasopressin (antidiuretic hormone) and oxytocin (a natriuretic hormone in rats) play key roles in this process. These hormones are synthesized by hypothalamic magnocellular neurosecretory cells (MNCs) that project to the neurohypophysis and are released into the systemic circulation in response to rises in ECF osmolality or [Na + ] o . These homeostatic responses are highly sensitive. For example, vasopressin release is elicited by an increase in ECF osmolality as small as ≥1%. The osmotic and sodium‐dependent control of vasopressin and oxytocin release at the neurohypophysis is directly regulated by the electrical activity of MNCs. This regulation involves an array of mechanisms that include synaptic inputs from the brain and periphery, the effects of chemicals released by glial cells, and intrinsic sensory properties of MNCs. These overlapping mechanisms may offer an important degree of redundancy for the homeostatic control of vasopressin and oxytocin release and contribute to the high sensitivity of these responses. Recent work has shown that the intrinsic sodium sensitivity and osmosensitivity of MNCs play an important role in the control of these neurons in vivo. This review provides an update of our current understanding of the molecular and cellular mechanisms that contribute to the cell‐autonomous sensory properties of MNCs.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 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 | 0.001 |
| 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".