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Visualization and Quantification of Brown and Beige Adipose Tissues in Mice using [18F]FDG Micro-PET/MR Imaging
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Mfn2 is critical for brown adipose tissue thermogenic function.

Marie Boutant1, Sameer S Kulkarni1, Magali Joffraud1

  • 1Nestlé Institute of Health Sciences, Lausanne, Switzerland.

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|March 29, 2017
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Summary

Mitochondrial dynamics protein mitofusin 2 (Mfn2) in brown fat is crucial for energy balance. Its deficiency impairs fat tissue function but protects against diet-induced obesity and insulin resistance.

Keywords:
brown adipose tissueinsulin resistancelipid dropletmitochondrial dynamicsmitofusin 2

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Area of Science:

  • Cell Biology
  • Metabolic Regulation
  • Mitochondrial Dynamics

Background:

  • Mitochondrial dynamics, including fusion and fission, are vital for cellular energy production and quality control.
  • Reduced mitofusin 2 (Mfn2) and increased mitochondrial fission are linked to insulin resistance in skeletal muscle.
  • The function of Mfn2 in brown adipose tissue (BAT), despite its high expression, is largely unknown.

Purpose of the Study:

  • To investigate the role of Mfn2 in brown adipose tissue (BAT) function and its impact on whole-body energy homeostasis.
  • To determine if Mfn2 deficiency in BAT affects metabolic responses to stimuli and diet-induced metabolic dysfunction.

Main Methods:

  • Generation and analysis of adipose-specific Mfn2 knockout (Mfn2-adKO) mice.
  • Assessment of BAT function, including respiratory capacity and response to adrenergic stimulation.
  • Investigation of Mfn2's interaction with perilipin 1 and lipid droplets.
  • Evaluation of Mfn2-adKO mice's response to high-fat diet-induced insulin resistance and hepatic steatosis.

Main Results:

  • Mfn2 deficiency in BAT (but not Mfn1) caused significant BAT dysfunction, reduced respiratory capacity, and blunted adrenergic response.
  • Mfn2 was found to directly interact with perilipin 1, mediating mitochondria-lipid droplet interaction during adrenergic stimulation.
  • Mfn2-adKO mice exhibited protection against high-fat diet-induced insulin resistance and hepatic steatosis.

Conclusions:

  • Mfn2 in BAT is essential for regulating mitochondria-lipid droplet interactions and lipolytic processes.
  • Mfn2 plays a critical role in maintaining BAT function and influencing whole-body energy homeostasis.
  • Targeting Mfn2 in BAT could offer a novel strategy for managing metabolic disorders like insulin resistance and fatty liver disease.