An investigation of the endosomal trafficking of the ClC-2 chloride channel
Bibliographic record
Abstract
The voltage-gated ClC-2 chloride channel has been functionally implicated in several physiological processes. First, ClC-2 knock-out mice are blind, and the males, infertile. Furthermore, a role for modulating neuronal ionic homeostasis has been proposed as mutations in ClC-2 are associated with epilepsy, and ClC-2 has been localized to the GABAergic synaptic locale in hippocampal neurons. Although the functional properties of ClC-2 have been extensively studied, less is known about the proteins and mechanisms that serve to regulate its function. The work presented here has made significant progress towards achieving a better understanding of how the vesicular trafficking of ClC-2 contributes to the modulation of its function. Using a combination of biochemical, physiological and cell biology techniques, we demonstrate that manipulations known to modulate ClC-2 channel function do so, in part, by altering its endosomal trafficking routes. Specifically, Calyculin A, which promotes protein phosphorylation, facilitates the internalization of ClC-2 in a dynamin-dependent manner, and ultimately leads to its proteasomal degradation. This retrograde pathway involves the dynein motor complex, which participates in a functional interaction with ClC-2. Conversely ATP depletion, a condition that promotes protein dephosphorylation, recruits intracellular ClC-2 to the cell surface in a Rab11-dependent pathway. Finally, we have found that ClC-2 is physically associated with the GABA A receptor in vivo. Our investigations suggest an extrasynaptic and possibly intracellular localization for this interaction, and provide the biochemical evidence to support a functional interaction between these two channels. We therefore propose that the endosomal trafficking of ClC-2 may play a significant role in the functional regulation of the GABA A receptor. Collectively, our findings underscore the physiological significance of the endosomal trafficking of ClC-2, and provide the structural framework for future studies aimed to determine the role of ClC-2 in endosomal function.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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 source (direct Gemma or distilled Codex), 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".