Early septic shock induces loss of oxidative phosphorylation yield plasticity in liver mitochondria
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ORIGINAL PAPER
Early septic shock induces loss of oxidative phosphorylation yield plasticity in liver mitochondria Pierre Eyenga & Damien Roussel & Jérôme Morel & Benjamin Rey & Caroline Romestaing & Loic Teulier & Shey-Shing Sheu & Joelle Goudable & Claude Négrier & Jean Paul Viale
Accepted: 1 August 2013 # University of Navarra 2014
Abstract We aimed to study the change in mitochondrial oxidative phosphorylation efficiency occurring at the early stage of septic shock in an experimental model. Thirty-six male Wistar rats were divided into two groups. In the first group, a cecal ligation and puncture (CLP) was carried out to induce septic shock for 5 h. The second group includes sham-operated rats and constitutes the control group. Blood gas analysis, alanine amino transferase, and lactic acid dosages were assayed 5 h after surgery. Liver mitochondria were isolated for
Electronic supplementary material The online version of this article (doi:10.1007/s13105-013-0280-5) contains supplementary material, which is available to authorized users. P. Eyenga : J. Morel : C. Négrier : J. P. Viale (*) Laboratoire Hémostase, Inflammation, et Sepsis; EA 4174, Université Claude Bernard Lyon 1, 69008 Lyon, France e-mail: [email protected] D. Roussel : C. Romestaing : L. Teulier Laboratoire d’Ecologie des Hydrosystèmes Naturels et Anthropisés; UMR 5023; CNRS, Université Claude Bernard Lyon 1, 69622 Villeurbanne, France J. Goudable Inserm U 870; INRA 1235, Université Claude Bernard Lyon 1, 69008 Lyon, France
in vitro functional characterization, including mitochondrial respiratory parameters, oxidative phosphorylation efficiency, oxi-radical production, membrane potential, and cytochrome c oxidase activity and content. Liver interleukin 1β (IL-1β) and tumor necrosis α mRNA levels were determined. Septic shock induced a severe hypotension occurring 180 min after CLP in association with a metabolic acidosis, an increase in plasma alanine amino transferase, liver IL-1β gene expression, and mitochondrial reactive oxygen species production. The rates of mitochondrial oxygen consumption and the activity and content of cytochrome c oxidase were significantly decreased while no alterations in the oxidative phosphorylation efficiency and inner membrane integrity were found. These results show that contrary to what was expected, liver mitochondria felt to adjust their oxidative phosphorylation efficiency in response to the decrease in the mitochondrial oxidative activity induced by CLP. This loss of mitochondrial bioenergetics plasticity might be related to mitochondrial oxidative stress and liver cytokines production. Keywords Sepsis . Organ failure . Oxidative phosphorylation . Mitochondria . Liver
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