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Related Experiment Videos

Is there a circulating proteolysis-inducing factor during sepsis?

P O Hasselgren1, J H James, D W Benson

  • 1Department of Surgery, University of Cincinnati Medical Center, OH 45267-0558.

Archives of Surgery (Chicago, Ill. : 1960)
|April 1, 1990
PubMed
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Sepsis-associated muscle protein breakdown is complex. Septic plasma increased total protein breakdown in fasted rat muscles but did not affect myofibrillar protein breakdown, suggesting circulating factors

Area of Science:

  • Biochemistry
  • Physiology
  • Molecular Biology

Background:

  • Sepsis can lead to muscle wasting and impaired function.
  • The specific mechanisms driving muscle proteolysis during sepsis are not fully understood.
  • The role of circulating factors in sepsis-induced muscle protein breakdown requires further investigation.

Purpose of the Study:

  • To investigate the effect of septic plasma and specific cytokines on muscle protein breakdown in rats.
  • To differentiate the impact on total protein versus myofibrillar protein breakdown.
  • To explore the potential role of circulating factors in sepsis-related muscle catabolism.

Main Methods:

  • Incubation of muscles from fed or 72-hour fasted rats.
  • Addition of plasma from septic rats, recombinant interleukin-1 alpha (rIL-1α), or recombinant tumor necrosis factor-alpha (rTNFα).

Related Experiment Videos

  • Assessment of total and myofibrillar protein breakdown via tyrosine and 3-methylhistidine release.

    • Main Results:

    • Septic plasma increased total protein breakdown by 10-20% in muscles from fasted rats.
    • Myofibrillar protein breakdown was not significantly affected by septic plasma in either fed or fasted rat muscles.
    • Recombinant IL-1α and TNFα did not alter total or myofibrillar protein breakdown at tested concentrations.

    Conclusions:

    • Circulating factors in septic plasma may contribute to increased total muscle protein breakdown, particularly in a fasted state.
    • The lack of effect on myofibrillar protein breakdown suggests specific pathways are not targeted by the tested septic plasma components.
    • The precise circulating factor responsible for muscle proteolysis in sepsis remains unidentified, warranting further research.