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Updated: Feb 7, 2026

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
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Mitofusin 2 Regulates Axonal Transport of Calpastatin to Prevent Neuromuscular Synaptic Elimination in Skeletal

Luwen Wang1, Ju Gao1, Jingyi Liu1

  • 1Department of Pathology, Case Western Reserve University, Cleveland, OH, USA.

Cell Metabolism
|July 19, 2018
PubMed

Insights

Mitofusin 2 (Mfn2) prevents skeletal muscle atrophy by suppressing neuromuscular synaptic loss. Increasing Mfn2 in neurons protects muscles in disease and aging models, suggesting Mfn2 as a therapeutic target.

Area of Science:

  • Neuroscience
  • Muscle Biology
  • Cellular Biology

Background:

  • Skeletal muscle atrophy is a significant issue in aging and disease.
  • Neuromuscular junction integrity is crucial for muscle function.
  • The molecular mechanisms underlying synaptic loss are not fully understood.

Purpose of the Study:

  • To investigate the role of mitofusin 2 (Mfn2) in preserving neuromuscular synapses.
  • To determine if Mfn2 can prevent skeletal muscle atrophy.
  • To explore Mfn2's mechanism of action in synaptic maintenance.

Main Methods:

  • Studied Mfn2 levels in spinal cords of SOD1G93A and aged mice.
  • Manipulated neuronal Mfn2 expression in mouse models.
  • Examined effects of Mfn2 on neuromuscular synaptic integrity and muscle mass.
  • Investigated Mfn2 interaction with calpastatin in mitochondria-associated membranes (MAMs).

Main Results:

  • Mfn2 levels are reduced in conditions causing muscle atrophy.
  • Increased neuronal Mfn2 prevents skeletal muscle wasting and synaptic loss.
  • Deletion of neuronal Mfn2 leads to synaptic dysfunction and atrophy.
  • Mfn2, in conjunction with calpastatin, regulates axonal transport and protects synapses.

Conclusions:

  • Mitofusin 2 (Mfn2) is a key suppressor of neuromuscular synaptic loss.
  • Mfn2 plays a vital role in maintaining skeletal muscle mass.
  • Mfn2 represents a potential therapeutic target for skeletal muscle atrophy.
Keywords:
Mfn2amyotrophic lateral sclerosisaxonal transportcalpastatinmitochondriamitochondria-associated membranesnerve injuryneuromuscular synapsesarcopeniaskeletal muscle atrophy

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