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Related Experiment Videos

Protein synthesis in specific tissues during sepsis

M Planas1, S Schwartz, E García-Arumí

  • 1Intensive Care Unit, Santiago Grisolía Metabolic Research Unit, Vall d'Hebron General Teaching Hospital, Barcelona, Spain.

Infusionstherapie Und Transfusionsmedizin
|April 1, 1995
PubMed
Summary

Protein synthesis rates (Ks) in sepsis are tissue-specific. Liver and diaphragm protein synthesis increase, while muscle protein synthesis decreases in septic animals, indicating a bidirectional response.

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Area of Science:

  • Physiology
  • Biochemistry
  • Sepsis Research

Background:

  • Sepsis significantly impacts whole-body protein metabolism.
  • Tissue-specific variations in protein synthesis during sepsis are not fully understood.

Purpose of the Study:

  • To investigate the hypothesis that fractional protein synthesis rates (Ks) are tissue-specific and bidirectional during sepsis.
  • To quantify Ks in key tissues (liver, diaphragm, triceps muscle) in a rat model of sepsis.

Main Methods:

  • Sepsis was induced in rats using intraperitoneal injection of sterile NaOH.
  • Fractional protein synthesis rates (Ks) were measured in liver, diaphragm, and triceps muscle tissue using the flooding-dose method.
  • Septic (n=27) and control (n=26) rat groups were compared.

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Main Results:

  • Ks were significantly elevated in the liver (112.2 ± 8 vs. 78.5 ± 13) and diaphragm (5.4 ± 1.9 vs. 2.9 ± 1.7) of septic rats compared to controls.
  • Ks were significantly decreased in the triceps muscle (2.9 ± 1.4 vs. 5 ± 1.8) of septic rats.
  • These findings demonstrate a bidirectional, tissue-specific regulation of protein synthesis during sepsis.

Conclusions:

  • The rate of protein synthesis is enhanced in priority tissues like the liver during sepsis.
  • Protein synthesis rates in muscle tissue vary, potentially in response to differing activity levels.
  • Results support a complex, tissue-specific metabolic adaptation to sepsis.