Cited by 65Cell death mechanisms and regulationCancer-related Molecular PathwaysAutophagy in Disease and Therapy

Bok is a genuine multi-BH-domain protein that triggers apoptosis in the absence of Bax and Bak

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Einsele-Scholz, Stephanie, Malmsheimer, Silke, Bertram, Katrin, Stehle, Daniel, Johänning, Janina, Manz, Marianne, Daniel, Peter T., Gillissen, Bernhard F. +2 more·2016·Journal of Cell Science

Abstract

The pro-apoptotic multidomain Bcl-2 proteins Bax and Bak (also known as BAK1) are considered the gatekeepers of the intrinsic pathway of apoptosis by triggering the mitochondrial release of cytochrome c. The role of the third Bax- and Bak-homologous multidomain protein Bok, however, is still unresolved. As cells doubly deficient for Bax and Bak are largely resistant to various apoptotic stimuli, it has been proposed that Bok is either dispensable for apoptosis or that its role is dependent on Bax and Bak. Here, we demonstrate, in several cell systems, that Bok efficiently induces cytochrome c release and apoptosis even in the complete absence of both Bak and Bax. Moreover, modulation of endogenous Bok levels affects the apoptosis response. By RNA interference and targeted deletion of the Bok gene, we demonstrate that Bok can significantly influence the apoptotic response to chemotherapeutic drugs in ovarian carcinoma cells. Hence, our results not only establish Bok as a Bak- and Bax-independent apoptosis inducer, but also suggest a potential impact of Bok expression in ovarian cancer therapy.

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Authors
Einsele-Scholz, S., Malmsheimer, S., Bertram, K., Stehle, D., Johänning, J., Manz, M., Daniel, P. T., Gillissen, B. F., Schulze-Osthoff, K., & Essmann, F.
Affiliations
  • Department of Molecular Medicine, Interfaculty Institute for Biochemistry, Eberhard Karls University 1 , Tübingen 72076 , Germany
  • University of Tübingen (DE)
  • German Cancer Research Center (DE)
Corresponding author
Essmann, Frank
Venue
Journal of Cell Science
Published
2016-06-01
Volume
129
Issue
11
Pages
2213-2223
ISSN
  • 0021-9533 (ISSN-L)
  • 1477-9137
OpenAlex
W2419365016
Cited by
65
References
41
Citations by year
2026: 3 · 2025: 1 · 2024: 4 · 2023: 9 · 2022: 5 · 2021: 7 · 2020: 9 · 2019: 8 · 2018: 6 · 2017: 9 · 2016: 4
FWCI
4.68
Type
journal article
Language
en
Open access
Locations
  • Journal of Cell Science (publishedVersion)
  • PubMed (publishedVersion)
  • MDC Repository (Max-Delbrueck-Center for Molecular Medicine) (acceptedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (SFB685, GRK1302)
  • Deutsche Krebshilfe (109894)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
BOK, Bax, Bak, Bcl-2 family proteins, mitochondrial apoptosis, cytochrome c release, ovarian carcinoma, chemotherapy response, apoptosis resistance
MeSH terms
Humans, Mitochondria, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Cytochromes c, HCT116 Cells, Green Fluorescent Proteins, bcl-2 Homologous Antagonist-Killer Protein, bcl-2-Associated X Protein, Cytostatic Agents, Gene Knockdown Techniques, MCF-7 Cells

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