Steinlechner-Maran 1996 Am J Physiol Cell Physiol

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Steinlechner-Maran R, Eberl T, Kunc M, Margreiter R, Gnaiger E (1996) Oxygen dependence of respiration in coupled and uncoupled endothelial cells. Am J Physiol Cell Physiol 271:C2053-61.

» PMID: 8997208

Steinlechner-Maran R, Eberl T, Kunc M, Margreiter R, Gnaiger E (1996) Am J Physiol Cell Physiol

Abstract: We studied the oxygen dependence of respiration in cultured human umbilical vein endothelial cells by use of high-resolution respirometry. The rate of oxygen consumption varied from 30 to 50 pmol O2 .s-1.10-6 cells over a sixfold range of cell densities. Respiration was stimulated up to 3.5-fold by uncoupling with carbonyl cyanide p-trifluoromethoxyphenylhydrazone or 2,4-Dinitrophenole, and the pO2 at half-maximal respiration (p50) increased from 0.05 to 0.12 kPa (0.3 to 0.9 Torr) with respiratory rate. p50 decreased to a minimum of 0.02 kPa when uncoupled cells were inhibited to control levels. Differences in cell size explained a variation of approximately 0.015 kPa in p50 at similar respiratory rates per cell. Oxygen diffusion to mitochondria contributed maximally 30% to the regulation of p50 in coupled cells, as deduced from the shallow slope of the flux dependence of p50 in uncoupled-inhibited cells compared with the slope in coupled cells. Therefore 70% of the flux dependence of p50 in coupled cells was caused by changes in metabolic state, which correlated with respiratory rate.

» Coupling control protocol: 1R;2U-


O2k-Network Lab: AT Innsbruck Gnaiger E


Labels: MiParea: Respiration, mt-Biogenesis;mt-density 


Organism: Human  Tissue;cell: Endothelial;epithelial;mesothelial cell, HUVEC  Preparation: Intact cells 

Regulation: Oxygen kinetics, Uncoupler  Coupling state: ROUTINE, ET 

HRR: Oxygraph-2k, O2k-Protocol 

SUIT-003 Ce1;ce2U-