Identification of molecular mechanisms that may contribute to the antidepressant effect of St. John's wort extract Ze 117
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Chronic stress is one of the factors that contribute to the development and maintenance of depression. Previous studies have shown that the treatment of cultured cells with the natural stress hormone cortisol, but also with synthetic relatives such as dexamethasone, led to a change in their plasma membrane fluidity. Furthermore, it is assumed that this can result in altered properties of membrane receptors that are suspected to be responsible for the development of depression and thus represent targets for its treatment. St. John's wort extract (SJW) Ze 117 has long been used as an alternative to synthetic antidepressants to treat mild to moderate depression. It has also been shown to counteract the glucocorticoid mediated effect on the plasma membrane fluidity of various cell types. Part of its molecular mode of action may therefore be due to an effect on the cellular lipid composition and thus on the properties of plasma membranes and receptor systems embedded within. The prior aim of the present work was to identify cellular target structures that may contribute to the antidepressant effect of Ze 117 using C6 and HEK cell based assays, including fluorescence anisotropy, RT-qPCR, proteomics, lipid analysis, β-arrestin 2 recruitment, and single particle tracking (SPT). <br /> The results show that dexamethasone has an increasing effect on the fluidity of C6 cell plasma membranes which was counteracted by the co-treatment with Ze 117. The performed experiments revealed that this is not due to an effect on the enzyme stearoyl-CoA-desaturase (SCD) but rather on cellular cholesterol synthesis. This was reflected in changed cellular cholesterol contents. While Ze 117 increased the cholesterol content by 42.5 %, dexamethasone reduced cholesterol levels similar to simvastatin. It was also shown that alterations in cholesterol levels affect the interaction of the intracellular protein β-arrestin 2 with the membranous G protein-coupled receptor (GPCR) 5-HT<sub>1A</sub>. Moreover, SPT experiments revealed that Ze 117 and other membrane fluidity affecting treatments alter the diffusion state occupancy of SNAP-tagged 5-HT<sub>1A</sub> receptor. <br /> In summary, Ze 117 affects membrane fluidity through cholesterol metabolism, impacting 5-HT<sub>1A</sub> receptor signal transduction and mobility, suggesting a new antidepressant mechanism.
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.
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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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