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Summary
Sepsis disrupts liver amino acid (AA) patterns, significantly lowering levels of key AAs like threonine and alanine. This depletion is more severe in non-survivors, indicating a disturbed hepatic AA metabolism during critical illness.
Area of Science:
- Biochemistry
- Critical Care Medicine
- Surgical Pathology
Background:
- Sepsis causes metabolic derangements affecting plasma and muscle amino acid (AA) profiles.
- Understanding the impact on the liver, a central metabolic organ, is crucial for sepsis management.
Purpose of the Study:
- To investigate the influence of abdominal sepsis on the free amino acid (AA) pattern within the liver.
- To compare hepatic AA concentrations in septic patients with a control group.
Main Methods:
- Liver tissue samples were collected during surgery from seven patients with abdominal sepsis.
- Hepatic AA concentrations were measured and compared to four control patients who underwent cholecystectomy.
Main Results:
- Most amino acid (AA) levels were decreased in septic livers, notably gluconeogenetic AAs (threonine, alanine), branched-chain AAs, lysine, and taurine.
- Non-survivors showed amplified depletion of these critical AAs.
- Elevated levels of P-ethanolamine, cystathionine, citrulline, beta-alanine, tyrosine, and phenylalanine were observed.
Conclusions:
- Sepsis significantly alters the free amino acid (AA) profile of the liver.
- Despite increased AA flux from muscle, the septic liver does not accumulate gluconeogenetic AAs, suggesting impaired hepatic utilization or altered transport mechanisms.