Your browser doesn't support javascript.
loading
Viability of HepG2 and MCF-7 cells is not correlated with mitochondrial bioenergetics.
Doczi, Judit; Karnok, Noemi; Bui, David; Azarov, Victoria; Pallag, Gergely; Nazarian, Sara; Czumbel, Bence; Seyfried, Thomas N; Chinopoulos, Christos.
Affiliation
  • Doczi J; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Karnok N; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Bui D; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Azarov V; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Pallag G; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Nazarian S; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Czumbel B; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary.
  • Seyfried TN; Biology Department, Boston College, Chestnut Hill, MA, 02467, USA. thomas.seyfried@bc.edu.
  • Chinopoulos C; Institute of Biochemistry and Molecular Biology, Department of Biochemistry, Semmelweis University, Budapest, 1094, Hungary. chinopoulos.christos@med.semmelweis-univ.hu.
Sci Rep ; 13(1): 10822, 2023 07 04.
Article in En | MEDLINE | ID: mdl-37402778
ABSTRACT
Alterations in metabolism are a hallmark of cancer. It is unclear if oxidative phosphorylation (OXPHOS) is necessary for tumour cell survival. In this study, we investigated the effects of severe hypoxia, site-specific inhibition of respiratory chain (RC) components, and uncouplers on necrotic and apoptotic markers in 2D-cultured HepG2 and MCF-7 tumour cells. Comparable respiratory complex activities were observed in both cell lines. However, HepG2 cells exhibited significantly higher oxygen consumption rates (OCR) and respiratory capacity than MCF-7 cells. Significant non-mitochondrial OCR was observed in MCF-7 cells, which was insensitive to acute combined inhibition of complexes I and III. Pre-treatment of either cell line with RC inhibitors for 24-72 h resulted in the complete abolition of respective complex activities and OCRs. This was accompanied by a time-dependent decrease in citrate synthase activity, suggesting mitophagy. High-content automated microscopy recordings revealed that the viability of HepG2 cells was mostly unaffected by any pharmacological treatment or severe hypoxia. In contrast, the viability of MCF-7 cells was strongly affected by inhibition of complex IV (CIV) or complex V (CV), severe hypoxia, and uncoupling. However, it was only moderately affected by inhibition of complexes I, II, and III. Cell death in MCF-7 cells induced by inhibition of complexes II, III, and IV was partially abrogated by aspartate. These findings indicate that OXPHOS activity and viability are not correlated in these cell lines, suggesting that the connection between OXPHOS and cancer cell survival is dependent on the specific cell type and conditions.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Energy Metabolism / Mitochondria Limits: Humans Language: En Journal: Sci Rep Year: 2023 Document type: Article Affiliation country:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Energy Metabolism / Mitochondria Limits: Humans Language: En Journal: Sci Rep Year: 2023 Document type: Article Affiliation country:
...