Mitochondrial membrane potential in human neutrophils is maintained by complex III activity in the absence of supercomplex organisation.

PloS One
Bram J van RaamT W Kuijpers

Abstract

Neutrophils depend mainly on glycolysis for their energy provision. Their mitochondria maintain a membrane potential (Deltapsi(m)), which is usually generated by the respiratory chain complexes. We investigated the source of Deltapsi(m) in neutrophils, as compared to peripheral blood mononuclear leukocytes and HL-60 cells, and whether neutrophils can still utilise this Deltapsi(m) for the generation of ATP. Individual activity of the oxidative phosphorylation complexes was significantly reduced in neutrophils, except for complex II and V, but Deltapsi(m) was still decreased by inhibition of complex III, confirming the role of the respiratory chain in maintaining Deltapsi(m). Complex V did not maintain Deltapsi(m) by consumption of ATP, as has previously been suggested for eosinophils. We show that complex III in neutrophil mitochondria can receive electrons from glycolysis via the glycerol-3-phosphate shuttle. Furthermore, respiratory supercomplexes, which contribute to efficient coupling of the respiratory chain to ATP synthesis, were lacking in neutrophil mitochondria. When HL-60 cells were differentiated to neutrophil-like cells, they lost mitochondrial supercomplex organisation while gaining increased aerobic glycolysis, ju...Continue Reading

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Methods Mentioned

BETA
flowcytometry
flow cytometry
density gradient centrifugation
protein assay

Software Mentioned

PDQuest
GraphPad
Prism
FACSDiva

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