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Related Experiment Videos

Profiling of dynamic changes in hypermetabolic livers.

Kyongbum Lee1, François Berthiaume, Gregory N Stephanopoulos

  • 1Shriners Burns Hospital and Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.

Biotechnology and Bioengineering
|June 12, 2003
PubMed
Summary
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Burn injury alters liver metabolism, upregulating the urea cycle, pentose phosphate pathway (PPP), and tricarboxylic acid (TCA) cycle. This metabolic shift impacts energy production and protein balance during catabolic states.

Area of Science:

  • Biochemistry
  • Metabolic Engineering
  • Physiology

Background:

  • The liver is crucial in managing negative nitrogen balance and muscle wasting in catabolic conditions like severe injury, cancer, and diabetes.
  • Understanding liver metabolic changes during these states is vital for patient outcomes.

Purpose of the Study:

  • To investigate dynamic changes in liver metabolism following burn injury using a rat model.
  • To identify specific metabolic pathways affected by hypermetabolism and muscle wasting.

Main Methods:

  • Utilized a rat skin burn injury model to induce hypermetabolism and muscle wasting.
  • Isolated and perfused rat livers under controlled conditions at various time points post-injury.
  • Applied steady-state metabolic flux analysis and k-means clustering to analyze reaction flux time profiles.

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Main Results:

  • Identified six distinct groups of differentially responsive metabolic reactions.
  • Burn injury sequentially upregulated the urea cycle, pentose phosphate pathway (PPP), and tricarboxylic acid (TCA) cycle.
  • Observed transient PPP upregulation and sustained urea and TCA cycle flux increases; beta-oxidation and gluconeogenesis remained unchanged.
  • Predicted increased ATP production and energy expenditure post-burn, linked to uncoupling protein-2 induction.

Conclusions:

  • Metabolic profiling via flux and clustering analysis effectively characterizes pathway activation in perfused organs.
  • This methodology identifies key metabolic pathways sensitive to injury without prior assumptions.
  • Burn injury induces a sequential and sustained metabolic reprogramming in the liver.