Mechanistic interplay between ceramide and insulin resistance

Area of Science:

• Biochemistry
• Metabolic Signaling
• Computational Biology

Background:

• Ceramides play a crucial role in glucose homeostasis and insulin signaling.
• The precise mechanisms governing ceramide metabolism and its impact on insulin resistance require further quantification.

Purpose of the Study:

• To develop and verify an extended computational model of C16:0 ceramide production.
• To investigate the role of ceramide metabolism in the development of insulin resistance in obese/diabetic murine macrophages.

Main Methods:

• Development of an extended mathematical model for ceramide synthesis (de novo and salvage pathways).
• Model verification using published data and independent experimental results.
• In silico simulations integrating transcriptomic data from obese/diabetic murine macrophages.

Main Results:

• The model accurately simulates ceramide production through both synthesis pathways.
• In silico experiments indicate insulin resistance emerges at later stages (16 weeks) in obese/diabetic models.
• Specific enzymes, including ceramide synthase, serine palmitoyltransferase, and dihydroceramide desaturase, are identified as critical regulators.

Conclusions:

• Ceramide metabolism, particularly de novo synthesis and salvage pathways, is pivotal in regulating insulin resistance.
• The identified enzymes are key targets for understanding and potentially treating insulin resistance in metabolic diseases.
• Computational modeling provides a valuable framework for dissecting complex metabolic interactions.