Cited by 225Mitochondrial Function and PathologyCancer and biochemical researchCoenzyme Q10 studies and effects

Low Reserve of Cytochrome c Oxidase Capacity in Vivo in the Respiratory Chain of a Variety of Human Cell Types

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Villani, Gaetano, Greco, Marilena, Papa, Sergio, Attardi, Giuseppe·1998·Journal of Biological Chemistry

Abstract

The question of whether and to what extent the in vivo cytochrome c oxidase (COX) capacity in mammalian cells exceeds that required to support respiration is still unresolved. In the present work, to address this question, a newly developed approach for measuring the rate of COX activity, either as an isolated step or as a respiratory chain-integrated step, has been applied to a variety of human cell types, including several tumor-derived semidifferentiated cell lines, as well as specialized cells removed from the organism. KCN titration assays, carried out on intact uncoupled cells, have clearly shown that the COX capacity is in low excess (16-40%) with respect to that required to support the endogenous respiration rate. Furthermore, measurements of O2 consumption rate supported by 0.4 mM tetramethyl-p-phenylenediamine in antimycin-inhibited uncoupled intact cells have given results that are fully consistent with those obtained in the KCN titration experiments. Similarly, KCN titration assays on digitonin-permeabilized cells have revealed a COX capacity that is nearly limiting (7-22% excess) for ADP + glutamate/malate-dependent respiration. The present observations, therefore, substantiate the conclusion that the in vivo control of respiration by COX is much tighter than has been generally assumed on the basis of experiments carried out on isolated mitochondria. This conclusion has important implications for understanding the role of physiological or pathological factors in affecting the COX threshold.

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Crossref · 10.1074/jbc.273.48.31829

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  • In diverse human cell lines, COX activity was found to be higher than that required to support endogenous respiration rates, allowing adaptability to higher respiratory needs.

    “It was initially characterized in diverse human cell lines, where COX activity was found to be higher than that required to support endogenous respiration rates, allowing this way some adaptability to higher respiratory needs (Villani et al, 1998).”

    From Mitochondrial response to nutrient availability and its role in metabolic disease (2014) · cites this paper as Villani et al, 1998

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Authors
Villani, G., Greco, M., Papa, S., & Attardi, G.
Affiliations
  • California Institute of Technology (US)
  • University of Bari Aldo Moro (IT)
Corresponding author
  • Villani, Gaetano
  • Attardi, Giuseppe
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1998-11
Volume
273
Issue
48
Pages
31829-31836
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2109528024
Cited by
225
References
47
Citations by year
2026: 6 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 2 · 2021: 7 · 2020: 5 · 2019: 2 · 2018: 6 · 2017: 6 · 2016: 7 · 2015: 6 · 2014: 12 · 2013: 10 · 2012: 11
FWCI
3.25
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • CINECA IRIS Institutional Research Information System (University of Bari Aldo Moro) (submittedVersion)
Funders
National Institute of General Medical Sciences (GM11726)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer and biochemical research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
Keywords
cytochrome c oxidase, electron transport chain, oxygen consumption, tetramethyl-p-phenylenediamine, digitonin-permeabilized cells, uncoupled respiration, cancer cell lines, human cell types
MeSH terms
Adenosine Diphosphate, Cell Differentiation, Cell Line, Cell Membrane Permeability, Electron Transport Complex IV, Digitonin, Carcinoma, Hepatocellular, Humans, Kinetics, Liver Neoplasms, Lung Neoplasms, Malates, Mitochondria, Multiple Myeloma, Neuroblastoma, Oxygen Consumption, Potassium Cyanide, Osteosarcoma, Tetramethylphenylenediamine, Tumor Cells, Cultured, Glutamic Acid

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