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Published on: November 28, 2015
Resolving versus non-resolving sphingolipid dynamics during macrophage activation: a time-resolved metabolic analysis
Nathan F Chiappa1, Nidhi Lal1, Edward A Botchwey2
1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA, USA; Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA.
Sphingolipid metabolism in macrophages shifts during inflammation, creating distinct cell states. Targeting specific metabolic pathways may help resolve inflammation and prevent disease.
Area of Science:
- Cellular and Molecular Biology
- Immunology
- Systems Biology
Background:
- Sphingolipids regulate inflammation and cell fate, with key metabolites like ceramide and sphingosine 1-phosphate having opposing roles.
- Macrophage sphingolipid balance is crucial for host defense, pathogenesis, and wound healing.
Purpose of the Study:
- To develop a time-resolved model of sphingolipid metabolism in RAW 264.7 macrophages during inflammation.
- To systematically map dynamic changes in the sphingolipid network and identify key regulatory nodes.
Main Methods:
- Integrated measured metabolite concentrations with dynamic flux estimation and enzyme kinetics.
- Developed a computational systems-level analysis approach.
- Stimulated RAW 264.7 macrophages with KdO2-Lipid A to model inflammatory response.
Main Results:
- Revealed a three-phase pattern of sphingolipid remodeling correlating with distinct macrophage functional states.
- Classified metabolites into 'resolving' and 'non-resolving' lipids based on their return to basal levels.
- Identified potential drug targets for modulating sphingolipid homeostasis and inflammation resolution.
Conclusions:
- Targeted modulation of specific sphingolipid metabolic nodes can influence inflammation resolution.
- Computational systems-level analysis is valuable for understanding sphingolipid dynamics in macrophages.
- Findings may guide therapeutic strategies for inflammatory diseases by preventing pathological amplification of signals.
