Subcellular distribution of low‐voltage activated T‐type Ca<sup>2+</sup> channel subunits (Ca<sub>v</sub>3.1 and Ca<sub>v</sub>3.3) in reticular thalamic neurons of the cat
Bibliographic record
Abstract
Low-voltage-activated (LVA) Ca(2+) channels play a critical role in the generation of burst firing in the thalamus. Recently, three LVA Ca(2+) channel isoforms (Ca(v)3.1, Ca(v)3.2, Ca(v)3.3) have been identified in the reticular thalamic nucleus (RE). Previous electrophysiological and modelling studies have suggested that kinetically different T-type channels might be expressed in a compartmentalized manner in RE cells. However, their precise subcellular distribution has not been fully elucidated. Using light and electron microscopic (EM) immunocytochemistry, we investigated the subcellular expression pattern of Ca(v)3.1 and Ca(v)3.3 channel subunits in RE neurons of the cat. Fluorescent and peroxidase labelling demonstrated the presence of Ca(v)3.1 channel predominantly on the somata and proximal dendrites and Ca(v)3.3 channels on cell bodies. Quantitative immunogold localization disclosed that Ca(v)3.1 and Ca(v)3.3 isoforms showed 5.8- and 8.7-fold higher density, respectively, in the cytoplasm compared with somatic plasma membrane. Density of Ca(v)3.1 isoform in the somatic plasma membrane was 2.21-fold higher compared with Ca(v)3.3 subunit. In the dendritic plasma membrane, Ca(v)3.1 channel isoform was expressed throughout the entire dendritic tree. In contrast, Ca(v)3.3 isoform was absent from large-caliber, presumably proximal dendritic segments. Quantitative comparison showed that the relative density of immunogold particles compared with dendritic surface was 8.9- and 14.8-fold higher for Ca(v)3.1 and Ca(v)3.3, respectively, in small-diameter dendrites than in large proximal dendritic segments or somata. Our results demonstrate a higher density of low-threshold Ca(2+) channels in distal dendrites and provide further evidence of the role of RE neuron dendrites in the generation of prolonged, low-threshold spike bursts.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| 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".