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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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The Mitochondrial PHB Complex Determines Lipid Composition and Interacts With the Endoplasmic Reticulum to Regulate

Artur B Lourenço1,2, María Jesús Rodríguez-Palero1,2, Mary K Doherty3

  • 1Andalusian Centre for Developmental Biology (CABD), CSIC-Universidad Pablo de Olavide-Junta de Andalucía, Seville, Spain.

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Mitochondrial prohibitin complex (PHB) depletion alters lipid metabolism and endoplasmic reticulum (ER) stress differently in aging worms. This impacts lifespan, revealing a new link between PHB, ER homeostasis, and aging regulation.

Keywords:
UPRERageinginsulinlipid dropletlipidomicsmitochondriaprohibitin (PHB)yolk

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Area of Science:

  • Cellular Biology
  • Aging Research
  • Metabolic Disorders

Background:

  • Metabolic disorders and aging are linked to physiological changes.
  • The mitochondrial prohibitin complex (PHB) influences longevity and lipid metabolism, but its function is unclear.
  • PHB's role in lifespan regulation across different metabolic states needs elucidation.

Purpose of the Study:

  • To investigate the molecular mechanism of mitochondrial PHB in lifespan regulation.
  • To understand how PHB depletion affects lipid metabolism and ER homeostasis in aging.
  • To explore the interaction between PHB, insulin signaling, and aging.

Main Methods:

  • Lipidomic analysis using liquid chromatography-mass spectrometry (LC-MS).
  • Biochemical assays, microscopy, and lifespan studies in *C. elegans*.
  • Investigated the unfolded protein response (UPRER) and DNJ-21 interactions.

Main Results:

  • PHB depletion differentially affected glycerophospholipids and glycerolipids in short-lived versus long-lived animals.
  • PHB depletion induced UPRER in wild-type worms, an effect mitigated in insulin signaling deficient (*daf-2*) mutants.
  • DNJ-21 depletion mimicked PHB deficiency's effects on UPRER and lifespan.

Conclusions:

  • Mitochondrial PHB modulates lipid metabolism distinctively based on the organism's metabolic status.
  • PHB is linked to ER homeostasis, suggesting a novel role in aging regulation.
  • PHB's function is context-dependent, influencing lifespan through lipid and ER stress pathways.