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Cardiolipin coordinates inflammatory metabolic reprogramming through regulation of Complex II disassembly and degradation.

Mack B ReynoldsHanna S HongBritton C MichmerhuizenAnna-Lisa E LawrenceLi ZhangChristian LoodCostas Andreas LyssiotisBasel H AbuaitaMary X D O'Riordan
Published in: Science advances (2023)
Macrophage metabolic plasticity enables repurposing of electron transport from energy generation to inflammation and host defense. Altered respiratory complex II function has been implicated in cancer, diabetes, and inflammation, but regulatory mechanisms are incompletely understood. Here, we show that macrophage inflammatory activation triggers Complex II disassembly and succinate dehydrogenase subunit B loss through sequestration and selective mitophagy. Mitochondrial fission supported lipopolysaccharide-stimulated succinate dehydrogenase subunit B degradation but not sequestration. We hypothesized that this Complex II regulatory mechanism might be coordinated by the mitochondrial phospholipid cardiolipin. Cardiolipin synthase knockdown prevented lipopolysaccharide-induced metabolic remodeling and Complex II disassembly, sequestration, and degradation. Cardiolipin-depleted macrophages were defective in lipopolysaccharide-induced pro-inflammatory cytokine production, a phenotype partially rescued by Complex II inhibition. Thus, cardiolipin acts as a critical organizer of inflammatory metabolic remodeling.
Keyphrases
  • lipopolysaccharide induced
  • oxidative stress
  • inflammatory response
  • type diabetes
  • transcription factor
  • toll like receptor
  • metabolic syndrome
  • papillary thyroid
  • immune response
  • protein kinase
  • weight loss