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Karavyraki 2022 BEC

From Bioblast

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Bioenergetics Communications        
Gnaiger 2020 BEC MitoPathways
Gnaiger Erich et al ― MitoEAGLE Task Group (2020) Mitochondrial physiology. Bioenerg Commun 2020.1.
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Bioenergetics Communications
Publications in the MiPMap
Karavyraki M, Gnaiger E, Porter RK (2022) Bioenergetics in human tongue pre-cancerous dysplastic oral keratinocytes and squamous cancer cells. Bioenerg Commun 2022.11.

» Bioenerg Commun 2022.11. Open Access pdf
published online 2022-11-11»Watch the presentation«

Karavyraki Marilena, Gnaiger Erich, Porter Richard K (2022) Bioenerg Commun

Abstract: BEC.png

In an endeavor to understand the metabolic phenotype behind oral squamous cell carcinomas, we characterized the bioenergetic profile of a human tongue derived cancer cell line (SCC-4 cells) and compared this profile to a pre-cancerous dysplastic oral keratinocyte (DOK) cell line also derived from human tongue. The human SCC-4 cancer cells had greater mitochondrial abundance but lower mitochondrial oxygen consumption rates than DOK cells. The lower oxygen consumption rate in SCC-4 cells can be partially explained by lower NADH-related enzymatic activity and lower mitochondrial complex 1 activity when compared to pre-cancerous DOK cells. In addition, SCC-4 cells have greater extracellular acidification rate (an index of glycolytic flux) when compared to DOK cells. In addition, treatment with recombinant human IL-6 (rhIL-6), known to drive anoikis resistance in SCC-4 cells but not DOK cells, impairs oxygen consumption in SCC-4 but not DOK cells, without affecting mitochondrial abundance. We conclude that SCC-4 cells have a less oxidative phenotype compared to DOK cells and that IL-6 attenuates mitochondrial function in SCC-4 cells while increasing glycolytic flux. Keywords: oral squamous cancer cells; mitochondria; interleukin 6; dysplastic oral keratinocytes; oxygen consumption Bioblast editor: Tindle-Solomon L O2k-Network Lab: AT Innsbruck Oroboros, IE Dublin Porter RK

ORCID: Karavyraki Marilena, ORCID.png Gnaiger Erich, ORCID.png Porter Richard K

Data availability

Original files are available Open Access at Zenodo repository:


» Karavyraki 2022 MitoFit


Marie Curie Grant TRACT 721906 H2020-MCSA-ITN 2016; COST Action CA15203 MitoEAGLE (2016-2021). We thank Rafael Moreno-Sanchez for a constructive review of our manuscript.

Labels: MiParea: Respiration  Pathology: Cancer 

Organism: Human 

Preparation: Permeabilized cells  Enzyme: Complex I, Marker enzyme, TCA cycle and matrix dehydrogenases  Regulation: Aerobic glycolysis  Coupling state: LEAK, ROUTINE, ET  Pathway: S, ROX  HRR: Oxygraph-2k 

Crabtree effect, BEC