Choline Transporter CHT Regulation and Function in Cholinergic Neurons
Why this work is in the frame
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Bibliographic record
Abstract
Choline uptake into cholinergic nerve terminals by the sodium-dependent high-affinity choline transporter CHT is essential for providing choline as substrate for synthesis of acetylcholine (ACh); ACh is used by cholinergic neurons to communicate information to a wide range of tissues in central and peripheral nervous systems. CHT is expressed almost exclusively in cholinergic neurons, and is subject to transcriptional and post-translational control by factors that promote or diminish cholinergic neurotransmission. The distribution of CHT proteins within cholinergic presynaptic terminals is dynamically regulated. Thus, choline uptake activity is determined largely by the plasma membrane CHT level, and this is finely controlled by a balance between internalization and recycling of CHT proteins in endosomal compartments. CHT proteins are also in synaptic vesicle membranes, thereby allowing cell surface CHT levels to increase rapidly in conjunction with exocytotic transmitter release to provide enhanced choline for ACh re-synthesis. Little is known about post-translational modification of CHT, although data is emerging that CHT activity and subcellular trafficking is modulated by kinase-mediated phosphorylation. Recent studies have also identified proteins with which CHT interacts, but this requires further investigation to reveal the role of other proteins in regulating CHT function and activity. Polymorphisms in CHT protein and modifications in its expression are linked to neurological and psychiatric disorders, and can alter function of peripheral systems that are regulated by cholinergic innervation, such as the cardiovascular system. The critical role of CHT in maintaining cholinergic transmission indicates that it could be a target for therapeutic intervention to promote ACh synthesis, but mechanisms by which this can be accomplished have not been adequately addressed.
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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) | 0.001 | 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 | 0.000 | 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 it