FAILURE OF INTESTINAL AMINO-ACID ABSORPTIVE MECHANISMS IN SEPSIS

BACKGROUND: Sepsis has been shown to impair the barrier function and m etabolism of the intestine, This study was done to investigate the eff ect of sepsis on intestinal absorption of proline, leucine, glutamic a cid, and aminoisobutyric acid, STUDY DESIGN: Rats (six per group) were studied 24 hours after;cecal ligation and puncture (CLP) or six hours after intraperitoneal injection of lipopolysaccharide (LPS), Controls underwent sham laparotomy or saline solution injection, Four 7-cm eve rted proximal jejunal sacs were prepared from each rat and filled with 800 mu L Krebs' bicarbonate buffer containing 100 mu mol/L of amino a cid, Paired sacs (septic and control) were incubated at 37 degrees C i n flasks containing the same solution trace labeled with H-3 amino aci d, Sac contents were aspirated 60 minutes later and amino acid uptake was determined by scintillation counting, RESULTS: Twenty-four hours a fter CLP and six hours after LPS administration there was significant impairment in the intestinal absorption of all amino acids studied, Ab sorption of glutamic acid was the least affected, followed by leucine, aminoisobutyric acid, and proline. CONCLUSIONS: Sepsis impairs the in testinal absorption of amino acids, The magnitude of this defect in ab sorption differed with the amino acid studied, suggesting that not all transport systems were affected equally, This differential response o f transport systems to sepsis appears to be the inverse of what is obs erved after a period of starvation.