Dual NLRC4 and non-canonical inflammasome signaling drives human GSDMD-mediated killing of independently of bacterial cardiolipin.
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| Abstract | Macrophages internalize and kill bacteria and thus are crucial for clearing bacterial infections. Although macrophage killing of some intracellular bacteria requires inflammasomes, the specific mechanisms of inflammasome-dependent killing are incompletely understood. Here we show that, upon infection with an intracellular pathogen , human macrophages activate a robust NLRC4-caspase-1 inflammasome response that restricts intracellular bacterial replication independently of pyroptosis. Gasdermin D (GSDMD) cleavage is required for bactericidal activity, revealing a GSDMD-dependent mechanism of bacterial killing independent of host cell death. We find that GSDMD-mediated killing of does not require bacterial cardiolipin, identifying a cardiolipinin-dependent mode of bacterial targeting. Priming macrophages with interferon (IFN)-γ enhances killing of intracellular by promoting involvement of caspase-4, which cooperates with caspase-1 to potentiate GSDMD function. These results identify a dual engagement of canonical and non-canonical inflammasomes that leads to macrophage killing while preserving host cell integrity. Furthermore, these findings uncover a previously unrecognized cardiolipin-independent mechanism of GSDMD-mediated bacterial killing with broad implications for immune cell control of cytosolic bacterial pathogens. |
| Year of Publication | 2026
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| Journal | bioRxiv : the preprint server for biology
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| Date Published | 01/2026
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| ISSN | 2692-8205
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| DOI | 10.64898/2026.01.11.698901
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| PubMed ID | 41542648
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