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Published in: Molecular Cancer 1/2008

Open Access 01-12-2008 | Research

Hypoxia induces protection against etoposide-induced apoptosis: molecular profiling of changes in gene expression and transcription factor activity

Authors: Audrey Sermeus, Jean-Philippe Cosse, Marianne Crespin, Veronique Mainfroid, Francoise de Longueville, Noelle Ninane, Martine Raes, Jose Remacle, Carine Michiels

Published in: Molecular Cancer | Issue 1/2008

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Abstract

Background

it is now well established that hypoxia renders tumor cells resistant to radio- but also chemotherapy. However, few elements are currently available as for the mechanisms underlying this protection.

Results

in this study, physiological hypoxia was shown to inhibit apoptosis induced in HepG2 cells by etoposide. Indeed, hypoxia reduced DNA fragmentation, caspase activation and PARP cleavage. The DNA binding activity of 10 transcription factors was followed while the actual transcriptional activity was measured using specific reporter plasmids. Of note is the inhibition of the etoposide-induced activation of p53 under hypoxia. In parallel, data from low density DNA microarrays indicate that the expression of several pro- and anti-apoptotic genes was modified, among which are Bax and Bak whose expression profile paralleled p53 activity. Cluster analysis of data unravels several possible pathways involved in the hypoxia-induced protection against etoposide-induced apoptosis: one of them could be the inhibition of p53 activity under hypoxia since caspase 3 activity parallels Bax and Bak expression profile. Moreover, specific downregulation of HIF-1α by RNA interference significantly enhanced apoptosis under hypoxia possibly by preventing the hypoxia mediated decrease in Bak expression without altering Bax expression.

Conclusion

these results are a clear demonstration that hypoxia has a direct protective effect on apoptotic cell death. Moreover, molecular profiling points to putative pathways responsible for tumor growth in challenging environmental conditions and cancer cell resistance to chemotherapeutic agents.
Appendix
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Metadata
Title
Hypoxia induces protection against etoposide-induced apoptosis: molecular profiling of changes in gene expression and transcription factor activity
Authors
Audrey Sermeus
Jean-Philippe Cosse
Marianne Crespin
Veronique Mainfroid
Francoise de Longueville
Noelle Ninane
Martine Raes
Jose Remacle
Carine Michiels
Publication date
01-12-2008
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2008
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-7-27

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Molecular Cancer 1/2008 Go to the issue
Webinar | 19-02-2024 | 17:30 (CET)

Keynote webinar | Spotlight on antibody–drug conjugates in cancer

Antibody–drug conjugates (ADCs) are novel agents that have shown promise across multiple tumor types. Explore the current landscape of ADCs in breast and lung cancer with our experts, and gain insights into the mechanism of action, key clinical trials data, existing challenges, and future directions.

Dr. Véronique Diéras
Prof. Fabrice Barlesi
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