Calcium Ionophore Activity of Intestinal Secretory Compounds
Why this work is in the frame
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Bibliographic record
Abstract
The association between reported intestinal fluid secretory activity of bile acids and Ca2+ ionophore properties was investigated in a pig jejunal brush border vesicle system. Secretory and nonsecretory bile acids and hydroxy-fatty acids were tested to see if Ca2+ ionophore activity is a general property of all bile acids and hydroxy-fatty acids, or if it is confined to compounds with recognized fluid secretory activity. Ionophore activity was attributed to compounds which could increase rates of Ca2+ influx and efflux from brush border vesicles under conditions where nonspecific permeability to sorbitol was not affected. The recognized secretory agents chenodeoxycholate and dioctyl sulfosuccinate had Ca2+ ionophore activity in the test system. The nonsecretory agents cholate, hyodeoxycholate and 4-hydroxybutyrate had no detectable activity, while ursodeoxycholate showed minor ionophore activity. Due to complications resulting from Ca2+ sequestration it was impossible to determine the Ca2+ ionophore activity of 12-hydroxystearate in this system. The detergent properties of all these agents are known to increase intestinal permeability, but detergent strength, as measured by concentration required to increase mannitol exchange across vesicle membranes, did not correlate well with secretory activity. We conclude that intestinal fluid secretion caused by bile acids and hydroxy-fatty acids could be controlled partially by Ca2+ ion interactions which could include intracellular signal effects of Ca2+ on anion permeability of the brush border membrane as well as possible increases in permeability of the tight junctions, and local hypertensive effects.
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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 | 0.000 | 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 it