Protein & Cell | 解锁运动员骨骼肌“优质脂滴”之谜：锚定线粒体的脂滴--“油和发动机”

TL;DR - A Protein & Cell study established a method to isolate human skeletal-muscle lipid droplets and mapped their proteome, revealing features that may explain why endurance athletes remain insulin-sensitive despite high muscular lipid stores. The findings offer molecular targets for studying diabetes and other metabolic diseases.

• PLIN4, rather than PLIN2 or PLIN5, was the most enriched perilipin coating protein on athletes’ skeletal-muscle lipid droplets.
• The study identified lipid droplet–anchored mitochondria enriched in respiratory-chain complex IV subunits COX6B1 and COX7C, suggesting enhanced fatty-acid oxidation.
• TPD52L2 was newly identified on lipid droplets; knockdown reduced triglycerides and droplet size and number, while overexpression promoted cell proliferation.
• Researchers plan to compare these “healthy” athlete lipid droplets with those from people with diabetes to investigate insulin resistance.