Cited by 74Phagocytosis and Immune RegulationImmune Response and InflammationImmune cells in cancer

Macrophages recycle phagocytosed bacteria to fuel immunometabolic responses

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Lesbats, Juliette, Brillac, Aurélia, Reisz, Julie A., Mukherjee, Parnika, Lhuissier, Charlène, Fernández-Monreal, Mónica, Dupuy, Jean-William, Sequeira, Angèle +9 more·2025·Nature

Published version of a preprint

Abstract

Macrophages specialize in phagocytosis, a cellular process that eliminates extracellular matter, including microorganisms, through internalization and degradation 1,2. Despite the critical role of phagocytosis during bacterial infection, the fate of phagocytosed microbial cargo and its impact on the host cell are poorly understood. In this study, we show that ingested bacteria constitute an alternative nutrient source that skews immunometabolic host responses. By tracing stable isotope-labelled bacteria, we found that phagolysosomal degradation of bacteria provides carbon atoms and amino acids that are recycled into various metabolic pathways, including glutathione and itaconate biosynthesis, and satisfies the bioenergetic needs of macrophages. Metabolic recycling of microbially derived nutrients is regulated by the nutrient-sensing mechanistic target of rapamycin complex C1 and is intricately tied to microbial viability. Dead bacteria, as opposed to live bacteria, are enriched in cyclic adenosine monophosphate, sustain the cellular adenosine monophosphate pool and subsequently activate adenosine monophosphate protein kinase to inhibit the mechanistic target of rapamycin complex C1. Consequently, killed bacteria strongly fuel metabolic recycling and support macrophage survival but elicit decreased reactive oxygen species production and reduced interleukin-1β secretion compared to viable bacteria. These results provide a new insight into the fate of engulfed microorganisms and highlight a microbial viability-associated metabolite that triggers host metabolic and immune responses. Our findings hold promise for shaping immunometabolic intervention for various immune-related pathologies.

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Crossref · 10.1038/s41586-025-08629-4

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  • Signals from dead cells can be metabolically sensed to skew macrophage function toward a repair phenotype.

    “This paradigm posits that signals from dead cells can be metabolically sensed to fundamentally skew macrophage function toward a repair phenotype (45).”
  • Macrophages phagocytosing dead-but not live-bacteria utilize derived nutrients to fuel synthesis of protective metabolites like glutathione and itaconate.

    “Pioneering work reveals that macrophages phagocytosing dead—but not live—bacteria utilize derived nutrients to fuel the synthesis of protective metabolites like glutathione and itaconate.”
  • The process of dead-cargo sensing is governed by a bacterial viability-sensing pathway: dead cargo-derived cAMP sustains the intracellular AMP pool, activating AMPK and inhibiting mTORC1, thereby orchestrating a metabolic shift towards antioxidant and anti-inflammatory responses.

    “This process is governed by a bacterial viability-sensing pathway: dead cargo-derived cyclic adenosine monophosphate (cAMP) sustains the intracellular adenosine monophosphate (AMP) pool, activating AMP-activated protein kinase (AMPK) and inhibiting mechanistic target of rapamycin complex C1 (mTORC1), thereby orchestrating a metabolic shift towards antioxidant and anti-inflammatory responses.”

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Authors
Lesbats, J., Brillac, A., Reisz, J. A., Mukherjee, P., Lhuissier, C., Fernández-Monreal, M., Dupuy, J.-W., Sequeira, A., Tioli, G., De La Calle Arregui, C., Pinson, B., Wendisch, D., Rousseau, B., Efeyan, A., Sander, L. E., D’Alessandro, A., & Garaude, J.
Affiliations
  • Université de Bordeaux (FR)
  • University of Colorado Anschutz (US)
  • Charité – Universitätsmedizin Berlin (DE)
  • Centre National de la Recherche Scientifique (FR)
  • Spanish National Cancer Research Centre (ES)
  • Berlin Institute of Health at Charité - Universitätsmedizin Berlin (DE)
Corresponding author
Garaude, Johan
Venue
Nature
Published
2025-02-26
Volume
640
Issue
8058
Pages
524-533
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W4407957911
Cited by
74
References
82
Citations by year
2026: 43 · 2025: 31
FWCI
27.40
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • Research Square (acceptedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
  • Oskar-Bordeaux (Universite de Bordeaux) (submittedVersion)
Funders
  • Bristol-Myers Squibb Foundation
  • Bristol-Myers Squibb
  • Università Italo Francese
  • Agence Nationale de la Recherche (ANR- 10-IDEX-03-02, 10‐IDEX‐03‐02, ANR-23-CE14-0044, ANR‐19, ANR-10-IDEX, ANR-23-CE17-0063, ANR-19-CE15-0018, ANR-10)
  • Institut National de la Santé et de la Recherche Médicale (ANR-10-IDEX-03-02)
  • Centre National de la Recherche Scientifique (ANR-10-IDEX-03-02)
  • Université de Bordeaux (ANR-10-IDEX-03-02, ANR-10-IDEX, 10IDEX-03-02)
  • Horizon 2020 Framework Programme (PID2019, ERC-2014-STG)
  • Agencia Estatal de Investigación (AEI//10.13039/501100011033/, 501100011033, 10.13039/501100011033, MCIN/AEI/10.13039/501 100 011 033, 13039, .13039/501100011033, 10.13039, H2020, PID2019)
  • H2020 European Research Council (638891)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
Keywords
macrophages, phagocytosis, immunometabolism, mTORC1, AMPK, cyclic AMP, glutathione synthesis, bacterial viability, reactive oxygen species, IL-1β
MeSH terms
RAW 264.7 Cells, Mechanistic Target of Rapamycin Complex 1, Cyclic AMP, Amino Acids, Animals, Bacteria, Energy Metabolism, Female, Glutathione, Macrophages, Male, Mice, Inbred C57BL, Phagocytosis, Phagosomes, Succinates, Reactive Oxygen Species, Microbial Viability, Mice, Interleukin-1beta, AMP-Activated Protein Kinases

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