Mitochondrial calcium regulates lipid metabolism by modulating tethering of mitochondria to lipid droplets.

Elevated mitochondrial matrix calcium induces detachment of mitochondria from lipid droplets, enhancing lipolysis in brown adipocytes.

• Why it matters: Understanding how mitochondrial positioning influences lipid metabolism is crucial for insights into energy regulation and potential metabolic disorder treatments.
• What they did: The study reconstituted mitochondria-lipid droplet interactions in brown adipocyte tissue ex vivo, testing various signals and manipulating calcium levels and NCLX activity.
• The result: Findings show that increased mitochondrial calcium causes detachment by transforming mitochondrial shape, and modulating NCLX activity controls attachment, promoting lipolysis and lipid catabolism.