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Form follows function: how muscle shape is regulated by work.

B Russell1, D Motlagh, W W Ashley

  • 1Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612, USA. russell@uic.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 10, 2000
PubMed
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Muscle cell shape and size are dictated by function, not form. Mechanical activity regulates protein synthesis and cell growth, influencing force production in cardiac and skeletal muscles.

Area of Science:

  • Muscle physiology
  • Cell biology
  • Biochemistry

Background:

  • The principle "form follows function" applies to muscle cells, where functional demands drive evolutionary adaptations.
  • Muscle cells adapt their shape, size, and force output in response to mechanical stimuli.
  • While protein synthesis pathways are understood, the regulation of muscle cell shape and regional growth remains unclear.

Purpose of the Study:

  • To review the regulation of muscle cell shape and contractile protein organization.
  • To examine how mechanical activity influences protein turnover and sarcomere assembly.
  • To identify key questions and experimental approaches for understanding muscle cell growth regulation.

Main Methods:

  • Review of existing literature on muscle cell biology and protein dynamics.

Related Experiment Videos

  • Analysis of molecular and biochemical assays related to protein synthesis.
  • Examination of studies on muscle hypertrophy and atrophy in cardiac and skeletal muscle.

    • Main Results:

    • Functional demand is a primary determinant of muscle cell morphology and force-generating capacity.
    • Hypertrophy (increased cell size) is proportional to increased force potential, with skeletal muscle primarily increasing cross-sectional area and cardiac muscle elongating.
    • Mechanical activity regulates the dynamic turnover and exchange of contractile proteins within myofibrils.

    Conclusions:

    • Muscle cell adaptation, including shape and size changes, is driven by functional requirements and mechanical loading.
    • Understanding the regulation of directional cell growth (longitudinal vs. transverse) in hypertrophy and atrophy is crucial.
    • Further research is needed to elucidate the molecular mechanisms governing muscle cell shape and regional growth.