Critical role of Annexin A1 in protection against pulmonary <i>Mycobacterium tuberculosis</i> infection. (P3320)
Bibliographic record
Abstract
Abstract Annexin1 is a 37kDa protein with wide spectrum of biological activity. Although there are data emphasizing on anti-inflammatory role of Annexin1 in inflammatory diseases, little is known about its role in pathogenesis of tuberculosis. Recently, it has been described the involvement of Annexin1 in the formation of apoptotic envelope, generation of "eat me" signal and activation of Tcells. As phagocytosis of apoptotic vesicles from Mycobacterium tuberculosis (Mtb) infected macrophages is one of the main sources of antigens for CD8T cells via cross-presentation, we hypothesized that impaired capacity of Annexin1-/-DC in cross-presentation increases host susceptibility to Mtb infection. We found that Annexin1-/-mice were severely susceptible to Mtb infection. High levels of pulmonary bacterial burden and mortality in Annexin1-/-mice were associated with reduced antigen-specific CD8T cell response in the lungs. This reduced response was not due to an intrinsic role of Annexin1 in macrophage apoptosis or T cell activation as generation of chimeric mice in which only T cells were deficient in Annexin1 did not show impairment in Tcell mediated immunity or protection against Mtb infection. Interestingly, both in vitro and in vivo, Annexin1-/-DC demonstrated a significantly reduced capacity to cross-present antigens to CD8Tcells. Together, these data identify Annexin1 as a central player in protective immunity against Mtb infection, by regulating the power of DC in cross-presentation.
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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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".