Proinflammatory cytokines increase the rate of glycolysis and adenosine-5'-triphosphate turnover in cultured rat enterocytes

Critical Care Medicine
Sören BergMitchell P Fink

Abstract

Measurements of steady-state adenosine-5'-triphosphate (ATP) levels in tissue samples from patients or experimental animals with sepsis or endotoxemia provide little information about the rate of ATP production and consumption in these conditions. Accordingly, we sought to use an in vitro "reductionist" model of sepsis to test the hypothesis that proinflammatory cytokines modulate ATP turnover rate. In vitro "reductionist" model of sepsis. University laboratory. Cultured rat enterocyte-like cells. IEC-6 nontransformed rat enterocytes were studied under control conditions or following incubation for 24 or 48 hrs with cytomix, a mixture of tumor necrosis factor-alpha (10 ng/mL), interleukin-1beta (1 ng/mL), and interferon-gamma (1000 units/mL). To measure ATP turnover rate, ATP synthesis was acutely blocked by adding to the cells a mixture of 2-deoxyglucose (10 mM), potassium cyanide (8 mM), and antimycin A (1 microM). ATP content was measured at baseline (before metabolic inhibition) and 0.5, 1, 2, 5, and 10 mins later. Log-linear ATP decay curves were generated and the kinetics of ATP utilization thereby calculated. ATP consumption rate was higher in cytomix-stimulated compared with control cells (3.11 +/- 1.39 vs. 1.25 +/- 0.6...Continue Reading

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Related Concepts

Adenosine Triphosphate, Chromium Ammonium Salt
Glucose, (beta-D)-Isomer
Glycolysis
Interferon Type II
Interleukin-1
RNA
Tumor Necrosis Factor-alpha
Cytokine
Pyemia
Inflammation Mediators

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