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Am. J. Respir. Crit. Care Med., Volume 164, Number 8, October 2001, 1444-1447

A Global Approach to Energy Metabolism in an Experimental Model of Sepsis

ERWAN L'HER and PHILIPPE SEBERT

Medical Intensive Care Unit, University Hospital, and Physiology Department, Medical University, Brest, France

Disturbances in energy metabolism during sepsis are not clearly understood. The aim of the study was to globally assess the energy drive in septic rat myocytes, studying both glycolysis rates and mitochondrial maximal activities together, using recent in vitro techniques. Measurements were assessed before (H0) and 4 h after sepsis induction (H4). Hyperlactatemia was observed in all septic animals ([lactate] = 1.2 ± 0.3 mmol/L at H0 versus 3.3 ± 0.6 mmol/L at H4; p < 0.001). An enhanced glycolysis rate was observed in both aerobic ( JA = 7.2 ± 0.9 at H0 versus 18.2 ± 4.1 nmol glucose/min/g at H4; p < 0.05) and anaerobic ( JB = 7.5 ± 1.2 at H0 versus 15.4 ± 3.4 µmol glucose/min/g at H4; p < 0.05) fluxes, associated with a selective significant pyruvate-malate-dependent oxygen consumption rate decrease (V O2-PM = 0.144 ± 0.008 at H0 versus 0.113 ± 0.007 µmol O2/h/mg at H4; p < 0.05). This oxygen consumption decrease can be interpreted either as a complex I and/or a complex I-ubiquinone relation alteration. Our results are consistent with the hypothesis that an altered mitochondrial function during sepsis is responsible, at least in part, for hyperlactatemia, which is thus a consequence of an increased glycolysis rate.




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