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Related Experiment Video

Updated: May 7, 2026

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
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BMP signaling controls muscle mass.

Roberta Sartori1, Elija Schirwis, Bert Blaauw

  • 11] Dulbecco Telethon Institute at the Venetian Institute of Molecular Medicine, Padova, Italy. [2] Department of Biomedical Sciences, University of Padova, Padova, Italy. [3].

Nature Genetics
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Summary

Bone morphogenetic protein (BMP) signaling is crucial for muscle growth and maintenance. This pathway regulates muscle mass by controlling protein degradation, impacting muscle atrophy and hypertrophy.

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Area of Science:

  • Muscle physiology and molecular biology
  • Cellular mechanisms of growth and atrophy
  • Signaling pathways in skeletal muscle

Background:

  • Cell size regulation depends on protein synthesis and degradation, influenced by various factors.
  • Myostatin inactivation causes muscle hypertrophy, but the underlying signals are unclear.
  • Understanding muscle maintenance and atrophy is vital for treating muscle-wasting diseases.

Purpose of the Study:

  • To identify the fundamental hypertrophic signal in muscle.
  • To elucidate the role of bone morphogenetic protein (BMP) signaling in muscle growth and atrophy.
  • To investigate the molecular mechanisms linking BMP signaling to muscle mass regulation.

Main Methods:

  • Investigated the effects of inhibiting BMP signaling in mice.
  • Analyzed the impact of BMP signaling on myostatin-deficient mice.
  • Examined the interaction between BMP signaling, denervation, fasting, and muscle atrophy.
  • Identified downstream targets of BMP signaling involved in muscle mass regulation.

Main Results:

  • Bone morphogenetic protein (BMP) signaling, via Smad1/5/8, acts as a fundamental hypertrophic signal in mice.
  • Inhibition of BMP signaling leads to muscle atrophy and counteracts myostatin-deficiency-induced hypertrophy.
  • BMP-Smad1/5/8 signaling negatively regulates Fbxo30, a gene encoding a ubiquitin ligase (MUSA1) essential for muscle loss.
  • BMP pathway inhibition exacerbates muscle atrophy caused by denervation and fasting.

Conclusions:

  • The BMP-Smad1/5/8 pathway is a critical regulator of adult muscle mass.
  • BMP signaling plays a fundamental role in muscle maintenance, growth, and atrophy.
  • This pathway's regulation of MUSA1 highlights a key mechanism in muscle homeostasis.