Summary
This experimental study investigated the mechanism by which premorbid obesity protects against ICU-acquired muscle weakness during sepsis using a mouse model of prolonged sepsis. The findings demonstrate that enhanced adipose tissue lipolysis and subsequent ketone body production in obese mice preserve muscle strength during critical illness, and that ketone supplementation alone can partially replicate this protective effect in lean animals, although muscle mass loss cannot be fully prevented. The research suggests that lipid and ketone availability, rather than obesity per se, constitute the protective factor against sepsis-induced muscle dysfunction.
UK applicability
The findings may inform nutritional support strategies in UK intensive care units for critically ill patients with sepsis, particularly regarding the role of lipid-based and ketone supplementation in parenteral nutrition protocols. However, direct translation from mouse models to human ICU management requires further clinical validation.
Key measures
Lipolysis markers, peripheral fatty acid oxidation, ketogenesis, muscle mass loss (percentage), specific maximal muscle force (percentage change relative to healthy controls), liver steatosis, lipid profile composition
Outcomes reported
The study measured markers of lipolysis, fatty acid oxidation, ketogenesis, muscle mass, and specific maximal muscle force in septic mice under various nutritional interventions. It demonstrated that adipose tissue-derived lipids and ketone bodies protect against sepsis-induced muscle weakness and wasting.
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