Mitochondria Bound to Lipid Droplets Have Unique Bioenergetics, Composition, and Dynamics that Support Lipid Droplet Expansion

Ilan Y. Benador, Michaela Veliova, Kiana Mahdaviani, Anton Petcherski, Jakob D. Wikstrom, Essam A. Assali, Rebeca Acín-Pérez, Michaël Shum, Marcus F. Oliveira, Saverio Cinti, Carole Sztalryd, William D. Barshop, James A. Wohlschlegel, Barbara E. Corkey, Marc Liesa, Orian S. Shirihai

Research output: Contribution to journalArticlepeer-review

341 Scopus citations

Abstract

Mitochondria associate with lipid droplets (LDs) in fat-oxidizing tissues, but the functional role of these peridroplet mitochondria (PDM) is unknown. Microscopic observation of interscapular brown adipose tissue reveals that PDM have unique protein composition and cristae structure and remain adherent to the LD in the tissue homogenate. We developed an approach to isolate PDM based on their adherence to LDs. Comparison of purified PDM to cytoplasmic mitochondria reveals that (1) PDM have increased pyruvate oxidation, electron transport, and ATP synthesis capacities; (2) PDM have reduced β-oxidation capacity and depart from LDs upon activation of brown adipose tissue thermogenesis and β-oxidation; (3) PDM support LD expansion as Perilipin5-induced recruitment of mitochondria to LDs increases ATP synthase-dependent triacylglyceride synthesis; and (4) PDM maintain a distinct protein composition due to uniquely low fusion-fission dynamics. We conclude that PDM represent a segregated mitochondrial population with unique structure and function that supports triacylglyceride synthesis. Benador et al. report on a distinct mitochondrial population associated with lipid droplets in the interscapular brown adipose tissue. Peridroplet mitochondria have enhanced bioenergetic capacity, reduced β-oxidation capacity, support lipid droplet expansion by providing ATP for triacylglyceride synthesis, and maintain a distinct protein composition due to low fusion-fission dynamics.

Original languageEnglish
Pages (from-to)869-885.e6
JournalCell Metabolism
Volume27
Issue number4
DOIs
StatePublished - 3 Apr 2018

Keywords

  • brown adipose tissue
  • lipid droplet
  • mitochondria
  • mitochondrial dynamics
  • peridroplet mitochondria

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology

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