Djafarzadeh 2012 PLoS One

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Djafarzadeh S, Vuda M, Takala J, Jakob SM (2012) Effect of remifentanil on mitochondrial oxygen consumption of cultured human hepatocytes. PLoS One 7:e45195.

Β» PMID: 23028840 Open Access

Djafarzadeh S, Vuda M, Takala J, Jakob SM (2012) PLoS One

Abstract: During sepsis, liver dysfunction is common, and failure of mitochondria to effectively couple oxygen consumption with energy production has been described. In addition to sepsis, pharmacological agents used to treat septic patients may contribute to mitochondrial dysfunction. This study addressed the hypothesis that remifentanil interacts with hepatic mitochondrial oxygen consumption. The human hepatoma cell line HepG2 and their isolated mitochondria were exposed to remifentanil, with or without further exposure to tumor necrosis factor-Ξ± (TNF-Ξ±). Mitochondrial oxygen consumption was measured by high-resolution respirometry, Caspase-3 protein levels by Western blotting, and cytokine levels by ELISA. Inhibitory ΞΊBΞ± (IΞΊBΞ±) phosphorylation, measurement of the cellular ATP content and mitochondrial membrane potential in intact cells were analysed using commercial ELISA kits. Maximal cellular respiration increased after one hour of incubation with remifentanil, and phosphorylation of IΞΊBΞ± occurred, denoting stimulation of nuclear factor ΞΊB (NF-ΞΊB). The effect on cellular respiration was not present at 2, 4, 8 or 16 hours of incubation. Remifentanil increased the isolated mitochondrial respiratory control ratio of complex-I-dependent respiration without interfering with maximal respiration. Preincubation with the opioid receptor antagonist naloxone prevented a remifentanil-induced increase in cellular respiration. Remifentanil at 10Γ— higher concentrations than therapeutic reduced mitochondrial membrane potential and ATP content without uncoupling oxygen consumption and basal respiration levels. TNF-Ξ± exposure reduced respiration of complex-I, -II and -IV, an effect which was prevented by prior remifentanil incubation. Furthermore, prior remifentanil incubation prevented TNF-Ξ±-induced IL-6 release of HepG2 cells, and attenuated fragmentation of pro-caspase-3 into cleaved active caspase 3 (an early marker of apoptosis). Our data suggest that remifentanil increases cellular respiration of human hepatocytes and prevents TNF-Ξ±-induced mitochondrial dysfunction. The results were not explained by uncoupling of mitochondrial respiration. β€’ Keywords: Sepsis, Liver dysfunction, Remifentanil, Tumor necrosis factor-Ξ± (TNF-Ξ±), Caspase-3, Nuclear factor ΞΊB (NF-ΞΊB)

β€’ O2k-Network Lab: CH Bern Djafarzadeh S

Labels: MiParea: Respiration, mt-Medicine, Pharmacology;toxicology  Pathology: Sepsis 

Organism: Human  Tissue;cell: Liver  Preparation: Isolated mitochondria 

Regulation: Coupling efficiency;uncoupling  Coupling state: LEAK, OXPHOS, ET  Pathway: N, S, CIV  HRR: Oxygraph-2k 

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