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Skewing cPLAα activity toward oxoeicosanoid production promotes neutrophil N2 polarization, wound healing, and the response to sepsis. | LitMetric

AI Article Synopsis

  • - Uncontrolled inflammation negatively impacts outcomes in conditions like sepsis and wound healing, which involve different stages of inflammation and resolution.
  • - The study focused on the role of ceramide 1-phosphate (C1P) in eicosanoid biosynthesis; specifically, a cPLA mutant (α mice) led to increased production of oxoeicosanoids and enhanced neutrophil activity.
  • - α mice showed better wound healing and lower sepsis risk due to a shift towards anti-inflammatory neutrophils (N2), linking C1P's interaction with cPLAα to impaired immune response and healing.

Article Abstract

Uncontrolled inflammation is linked to poor outcomes in sepsis and wound healing, both of which proceed through distinct inflammatory and resolution phases. Eicosanoids are a class of bioactive lipids that recruit neutrophils and other innate immune cells. The interaction of ceramide 1-phosphate (C1P) with the eicosanoid biosynthetic enzyme cytosolic phospholipase A (cPLA) reduces the production of a subtype of eicosanoids called oxoeicosanoids. We investigated the effect of shifting the balance in eicosanoid biosynthesis on neutrophil polarization and function. Knockin mice expressing a cPLA mutant lacking the C1P binding site (α mice) showed enhanced and sustained neutrophil infiltration into wounds and the peritoneum during the inflammatory phase of wound healing and sepsis, respectively. The mice exhibited improved wound healing and reduced susceptibility to sepsis, which was associated with an increase in anti-inflammatory N2-type neutrophils demonstrating proresolution behaviors and a decrease in proinflammatory N1-type neutrophils. The N2 polarization of α neutrophils resulted from increased oxoeicosanoid biosynthesis and autocrine signaling through the oxoeicosanoid receptor OXER1 and partially depended on OXER1-dependent inhibition of the pentose phosphate pathway (PPP). Thus, C1P binding to cPLAα suppresses neutrophil N2 polarization, thereby impairing wound healing and the response to sepsis.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10565596PMC
http://dx.doi.org/10.1126/scisignal.add6527DOI Listing

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