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Polyamine import and accumulation causes immunomodulation in macrophages engulfing apoptotic cells (Part 3)

ABSTRACT: Phagocytosis of apoptotic cells, termed efferocytosis, is critical for tissue homeostasis and drives anti-inflammatory programming in engulfing macrophages. Here, we assess metabolites in naïve and inflammatory macrophages following engulfment of multiple cellular and non-cellular targets. Efferocytosis leads to unique increases in the arginine-derived polyamines, spermidine and spermine, in vitro and in vivo. Surprisingly, polyamine accumulation after efferocytosis does not arise from retention of apoptotic cell metabolites or de novo synthesis, but from enhanced polyamine import that is dependent on Rac1, actin, and PI3 kinase. Blocking polyamine import prevents efferocytosis from suppressing macrophage IL-1beta or IL-6. This identifies efferocytosis as a trigger for polyamine import and accumulation, and imported polyamines as mediators of efferocytosis-induced immune reprogramming.

ORGANISM(S): Mouse Mus Musculus

TISSUE(S): Macrophages

SUBMITTER: Julie Haines

PROVIDER: ST001998 | MetabolomicsWorkbench | Mon Nov 22 00:00:00 GMT 2021

REPOSITORIES: MetabolomicsWorkbench

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Polyamine import and accumulation causes immunomodulation in macrophages engulfing apoptotic cells (Part 4)

Project description:Phagocytosis of apoptotic cells, termed efferocytosis, is critical for tissue homeostasis and drives anti-inflammatory programming in engulfing macrophages. Here, we assess metabolites in naïve and inflammatory macrophages following engulfment of multiple cellular and non-cellular targets. Efferocytosis leads to unique increases in the arginine-derived polyamines, spermidine and spermine, in vitro and in vivo. Surprisingly, polyamine accumulation after efferocytosis does not arise from retention of apoptotic cell metabolites or de novo synthesis, but from enhanced polyamine import that is dependent on Rac1, actin, and PI3 kinase. Blocking polyamine import prevents efferocytosis from suppressing macrophage IL-1beta or IL-6. This identifies efferocytosis as a trigger for polyamine import and accumulation, and imported polyamines as mediators of efferocytosis-induced immune reprogramming.

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