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September 15, 2007Cancer Research

Topoisomerase IIβ–Mediated DNA Double-Strand Breaks: Implications in Doxorubicin Cardiotoxicity and Prevention by Dexrazoxane

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Key result

Dexrazoxane specifically abolished doxorubicin-induced DNA damage in cardiomyocytes by antagonizing Top2 cleavage complex formation and inducing rapid degradation of Top2beta.

Why the study?

Does dexrazoxane prevent doxorubicin-induced DNA damage in cardiomyocytes via Top2beta interference?

Population

H9C2 cardiomyocytes and top2beta(-/-) and TOP2beta(+/+) mouse embryonic fibroblasts (MEF)

Comparison

Dexrazoxane and proteasome inhibitors in the… vs Doxorubicin alone, camptothecin, hydrogen…

Design

Preclinical

Authors

YLYi Lisa LyuHigh Magnetic Field LaboratoryJKJohn E. KerriganBrown UniversityCLChao‐Po LinShanghaiTech University

Discussion

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Implication

Does not support changes in dexrazoxane use; leaves open clinical translation of Top2β-mediated cardioprotection.

Key Points

  • This study aims to understand how dexrazoxane protects against doxorubicin-induced DNA damage in cardiac cells through topoisomerase IIβ interference.
  • Analyzed DNA damage in H9C2 cardiomyocytes induced by doxorubicin and treated with dexrazoxane.
  • Assessed effects of proteasome inhibitors on doxorubicin-induced DNA damage in cardiomyocytes.
  • Used top2beta knockout mouse embryonic fibroblasts to evaluate the role of Top2beta in DNA damage signaling.
  • Dexrazoxane abolished the gamma-H2AX signal induced by doxorubicin in H9C2 cells, indicating reduced DNA damage.
  • Doxorubicin-induced DNA damage was significantly lower in top2beta(-/-) MEFs compared to TOP2beta(+/+) MEFs.
  • Dexrazoxane induced degradation of Top2beta, correlating with reduced DNA damage from doxorubicin.

Structured PICO

Does dexrazoxane prevent doxorubicin-induced DNA damage in cardiomyocytes via Top2beta interference?

P
Population
H9C2 cardiomyocytes and top2beta(-/-) and TOP2beta(+/+) mouse embryonic fibroblasts (MEF)
I
Intervention
Dexrazoxane and proteasome inhibitors (bortezomib, MG132) in the presence of doxorubicin
C
Comparator
Doxorubicin alone, camptothecin, hydrogen peroxide, or TOP2beta(+/+) MEFs
O
Outcome
DNA damage signal gamma-H2AX and Top2beta degradationsurrogate

Dexrazoxane protects against doxorubicin cardiotoxicity by antagonizing doxorubicin-induced DNA damage through interference with Top2beta.

Cite This Study

Lyu et al. (2007) studied Doxorubicin cardiotoxicity. Dexrazoxane vs. Doxorubicin alone was evaluated on DNA damage signal gamma-H2AX. Dexrazoxane specifically abolished doxorubicin-induced DNA damage in cardiomyocytes by antagonizing Top2 cleavage complex formation and inducing rapid degradation of Top2beta.

synapsesocial.com/papers/6a46febbf81ec6c7245ed111https://doi.org/10.1158/0008-5472.can-07-1649
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Also Consider

Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Cardiac Toxicity of Antineoplastic Anthracyclines2003 · 128 citations
  2. 2Immunohistochemical analyses of DNA topoisomerase II isoforms in developing rat cerebellum2001 · 58 citations