Differential caspase regulation of actin dynamics during <i>Legionella pneumophila</i> infection (INC4P.324)
Bibliographic record
Abstract
Abstract Legionella pneumophila (Legionella) is the causative agent of Legionnaires’ disease. Clearance of Legionella requires efficient phagolysosomal fusion. Regulation of the host actin cytoskeleton is crucial for proper vesicle trafficking. It has been determined that activation of caspases-1/11 are required for trafficking and fusion during infection. The molecular mechanisms of caspase-mediated clearance are unknown. It is this study’s objective to decipher the effects of caspase-1/11 on actin dynamics to promote phagolysosomal fusion and restriction. During Legionella infection, caspase-1 and -11-/- macrophages exhibited diminished F/G-actin ratios compared to WT counterparts. In addition, the absence of caspase-1 or -11 prevented the colocalization of the bacterium with F-actin, inhibiting fusion. In elucidating the molecular mechanism, it was found that caspase-1 and -11 differentially distinct molecules upstream of the actin regulator cofilin. We found that the activation of cofilin was affected by both caspases distinctly to promote phagolysosomal fusion, during Legionella infection. These data establish that inflammasome caspases differentially regulate actin polymerization during Legionella infection by modulating F-actin assembly via the activation of cofilin. Understanding the novel molecular mechanisms of caspase-mediated regulation of the host cytoskeletal network will provide novel targets to develop therapeutic interventions for numerous infectious diseases.
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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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".