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• W1992606921 abstract "Electron paramagnetic resonance (EPR) spectra of complex biological systems contain information about the paramagnetic centres present. Retrieving such information is important since paramagnetic species are common intermediates of all redox reactions in both normal and abnormal metabolism. However, it is often difficult to determine the nature and content of all paramagnetic species present because the EPR signals from individual centres overlap. Here, we apply our deconvolution method based on spectra subtraction with variable coefficient to quantify individual paramagnetic components of human muscle biopsies taken from critically ill patients with severe sepsis. We use low temperature EPR spectroscopy to identify and quantify nine different paramagnetic species in the tissue. These include the majority of the mitochondrial iron–sulfur centres and the first in vivo report of a mitochondrial radical assigned to a spin-coupled pair of semiquinones (SQ·–SQ·). We have previously demonstrated in these same muscle biopsies that biochemical assays of mitochondrial dysfunction correlate with clinical outcomes (D. Brealey, M. Brand, I. Hargreaves, S. Heales, J. Land, R. Smolenski, N.A. Davies, C.E. Cooper, M. Singer, Association between mitochondrial dysfunction and severity and outcome of septic shock. Lancet 360 (2002) 219–223.). Analysis of the paramagnetic centres in the muscle confirms and extends these findings: the (SQ·–SQ·) radical species negatively correlates with the illness severity of the patient (APACHE II score) and a decreased concentration of mitochondrial Complex I iron–sulfur redox centres is linked to mortality." @default.
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• W1992606921 date "2006-04-01" @default.
• W1992606921 modified "2023-10-16" @default.
• W1992606921 title "Mitochondrial dysfunction in patients with severe sepsis: An EPR interrogation of individual respiratory chain components" @default.
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• W1992606921 doi "https://doi.org/10.1016/j.bbabio.2006.03.007" @default.
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