Mechanisms of calcium-induced mitochondrial biogenesis and GLUT4 synthesis
Bibliographic record
Abstract
Regularly performed aerobic exercise leads to increases in skeletal muscle mitochondria and glucose transporter 4 (GLUT4) protein content, resulting in an enhanced capacity to oxidize substrates and improvements in insulin- and contraction-mediated glucose uptake. Although the specific mechanisms governing these adaptive responses have not been fully elucidated, accumulating evidence suggests that the increase in cytosolic Ca2+ that occurs with each wave of sacrolemmal depolarization is a key component of these processes. Treating L6 muscle cells with agents that increase Ca2+ without causing reductions in ~P or the activation of 5'-AMP-activated protein kinase leads to increases in GLUT4 and mitochondrial protein contents. This effect is likely controlled through calcium/calmodulin-dependent protein kinase (CaMK), since KN93, a specific CaMK inhibitor, blocks these adaptive responses. Recent findings provide evidence that the activation of p38 mitogen-activated protein kinase (MAPK) is involved in the pathway through which Ca2+/CaMK mediates mitochondrial and GLUT4 biogenesis. p38 MAPK initiates GLUT4 and mitochondrial biogenesis through the activation of transcription factors and transcriptional coactivators such as myocyte enhancer factor 2 (MEF2) and peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1 alpha). Subsequent increases in the content of these proteins further enhance Ca2+-induced GLUT4 and mitochondrial biogenesis. Since decreases in mitochondrial and GLUT4 contents are associated with skeletal muscle insulin resistance, an understanding of the mechanisms by which these processes can be normalized will aid in the prevention and treatment of type 2 diabetes.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.004 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".