Patterns of Epithelial Cell Invasion by Different Species of the <i>Burkholderia cepacia</i> Complex in Well-Differentiated Human Airway Epithelia
Bibliographic record
Abstract
Burkholderia cepacia has emerged as a serious respiratory pathogen in cystic fibrosis (CF) patients. The clinical course of B. cepacia infections is variable, but approximately 20% of patients eventually succumb to the cepacia syndrome, which is characterized as a fatal necrotizing pneumonia with bacteremia. The mechanisms that permit B. cepacia to cause bacteremia are not yet known but probably involve sequential penetration of airway barriers. This study evaluated the abilities of different species of the B. cepacia complex, including a strain from the ET12 lineage (BC-7, genomovar III, cblA(+)), which is associated with most cepacia syndrome fatalities among CF populations, a genomovar IV strain (HI2258), and a genomovar II strain (J-1) to penetrate polarized, well-differentiated human airway epithelial cell cultures. As revealed by light and electron microscopy, all three B. cepacia strains tested circumvented the mechanical barriers of mucus and ciliary transport to penetrate the airway epithelium but they used different routes. The BC-7 strain (genomovar III) formed biofilms in close proximity to the apical cell surface, followed by invasion and destruction of epithelial cells. This process involved disruption of the glycocalyx and rearrangements of the actin cytoskeleton. The HI2258 strain (genomovar IV) did not form biofilms, and the majority of bacteria that penetrated the epithelium were located between epithelial cells, suggesting paracytosis. Strain J-1 penetrated the epithelium both by cell destruction and paracytosis. These studies suggest that the distinct invasion pathways employed by B. cepacia may account for differences in virulence between B. cepacia genomovars.
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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) | 0.000 | 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) | 0.001 | 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 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".