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Lipid Droplets Big and Small: Basic Mechanisms That Make Them All.

Robin W Klemm1, Pedro Carvalho2

  • 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom;

Annual Review of Cell and Developmental Biology
|October 2, 2024
PubMed
Summary

Lipid droplets (LDs) are key to metabolism, with diverse forms and functions. Adipocytes show unique adaptations in LD biogenesis for regulating lipid and energy balance.

Keywords:
LDLD biogenesisLD contact sitesLD heterogeneityLD protein targetingLD size controladipocytelipid droplet

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Area of Science:

  • Cell Biology
  • Metabolism
  • Lipid Biology

Background:

  • Lipid droplets (LDs) are essential organelles for lipid and energy metabolism.
  • Their structure includes a neutral lipid core and a phospholipid monolayer with surface proteins.
  • LD surface composition dictates properties like size and organelle interactions.

Purpose of the Study:

  • To review general mechanisms of LD biogenesis.
  • To highlight adipocyte-specific adaptations in LD formation and function.
  • To discuss recent advances in understanding LD heterogeneity and regulation.

Main Methods:

  • Literature review of current research on lipid droplet biogenesis.
  • Analysis of studies focusing on adipocyte lipid metabolism.
  • Synthesis of findings on general and specific LD formation pathways.

Main Results:

  • LDs exhibit significant heterogeneity across cell types due to diverse metabolic needs.
  • All LDs share common biogenesis pathways.
  • Adipocytes possess specialized mechanisms for LD biogenesis, crucial for whole-body energy homeostasis.

Conclusions:

  • Understanding LD biogenesis is key to comprehending lipid and energy metabolism.
  • Adipocyte-specific LD adaptations are critical for metabolic regulation.
  • Further research into LDs promises insights into metabolic diseases.