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Related Experiment Videos

Corticosteroid effects on diaphragm neuromuscular junctions

G C Sieck1, R H Van Balkom, Y S Prakash

  • 1Department of Anesthesiology, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.sieck.gary@mayo.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 14, 1999
PubMed
Summary

Corticosteroid treatment caused atrophy in specific muscle fibers, leading to relatively larger neuromuscular junctions. This may improve neuromuscular transmission, especially in type IIx/b fibers.

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Area of Science:

  • Muscle physiology
  • Neuroscience
  • Pharmacology

Background:

  • Corticosteroids (CS) are widely used but can affect muscle function.
  • The impact of CS on neuromuscular junction (NMJ) morphology and transmission is not fully understood.
  • Muscle fiber type composition influences response to pharmacological interventions.

Purpose of the Study:

  • To investigate the effects of chronic corticosteroid (prednisolone) administration on rat diaphragm muscle (Dimus) NMJ morphology and neuromuscular transmission.
  • To compare these effects across different muscle fiber types based on myosin heavy chain (MHC) isoform expression.
  • To determine if observed NMJ changes correlate with alterations in neuromuscular transmission.

Main Methods:

  • Rats received subcutaneous prednisolone (5.6 mg/kg/day) for 3 weeks.

Related Experiment Videos

  • Muscle fibers were classified by MHC isoform expression (MHCslow, MHC2A, MHC2X, MHC2B).
  • NMJ morphology (nerve terminals, motor endplates) and neuromuscular transmission (force loss during repetitive stimulation) were assessed.

    • Main Results:

    • CS treatment induced significant atrophy in MHC2X and MHC2X/b fibers, but not in MHCslow or MHC2A fibers.
    • Planar areas of nerve terminals and motor endplates were reduced in CS-treated type IIx/b fibers.
    • Normalized to fiber diameter, NMJs were relatively larger in CS-treated rats.
    • Neuromuscular transmission failure was reduced in CS-treated muscle.

    Conclusions:

    • Corticosteroid-induced muscle atrophy is fiber-type dependent, primarily affecting type IIx/b fibers.
    • Alterations in NMJ morphology are also fiber-type specific.
    • These NMJ adaptations may contribute to improved neuromuscular transmission despite muscle atrophy.