Dynamic Response of Arterial Cerebral Ca <sub>V</sub> 1.2 Channels to Intravascular Pressure
Bibliographic record
Abstract
Intravascular pressure elicits arterial constriction by elevating intracellular [Ca 2+ ] in vascular smooth muscle cells (SMCs). Past studies have argued that this rise is singularly linked to depolarization and the voltage‐dependent gating of L‐type (Ca V 1.2) Ca 2+ channels. While important, pressure might also directly modulate Ca V 1.2 activity by promoting functional coupling among subunits, a response that enhances Ca 2+ sparklets generation. In this regard, the study goal was to define the mechanosensitivity of Ca V 1.2 channels using a range of electrophysiological approaches. Beginning with whole‐cell patch clamp electrophysiology, we show that SMCs stretching by a hypoosmotic challenge (from 300 to 200 mOsm) leads to a marked rise in total Ca 2+ current (around 40%) without changing voltage‐dependent activation/inactivation properties. This mechanosensitive response reflects augmented functional coupling, as revealed through recordings of single channel activity. Ongoing work has further revealed that the rise in functional coupling was intimately linked to caveolin‐1, caveolae forming membrane protein tied to the cytoskeleton dynamics and signal transduction. This protein‐protein relationship was also observed at the immunohistochemical level, with the proximity ligation assay showing that Ca V 1.2 colocalizes with caveolin‐1 when SMCs are stretched by the hypoosmotic challenge. In closing, the current work reveals that Ca V 1.2 channels are a dynamic target of intravascular pressure and likely integral to a robust myogenic response. Continuing work will define the composition of the pressure‐sensitive signaling complex and how it is impacted by disease.
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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 | 0.000 |
| 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 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".