EndoG Links Bnip3-Induced Mitochondrial Damage and DNA Fragmentation in Ischemic Cardiomyocytes
Author Information
Author(s): Zhang Jisheng, Ye Junmei, Altafaj Albert, Cardona Maria, Bahi Núria, Llovera Marta, Cañas Xavier, Cook Stuart A., Comella Joan X., Sanchis Daniel
Primary Institution: Institut de Recerca Biomèdica de Lleida (IRBLLEIDA), Universitat de Lleida, Lleida, Spain
Hypothesis
EndoG could be the executor of caspase-independent DNA processing in the Bnip3-mediated cardiomyocyte death pathway.
Conclusion
EndoG and Bnip3 are involved in caspase-independent DNA fragmentation in ischemic cardiomyocytes.
Supporting Evidence
- EndoG and Bnip3 are expressed abundantly in the differentiated myocardium compared to the embryo.
- EndoG is the link between Bnip3-mediated mitochondrial dysfunction and DNA degradation during ischemia in cardiomyocytes.
- TUNEL labeling is due to EndoG and is unrelated to caspase activity in ischemic myocytes in vitro.
- Bcl-xL can prevent transiently caspase-independent DNA fragmentation by blocking EndoG translocation from mitochondria.
Takeaway
This study shows that two proteins, EndoG and Bnip3, work together to cause cell death in heart cells when they are not getting enough oxygen, without using the usual cell death signals.
Methodology
The study analyzed the roles of EndoG and Bnip3 in DNA fragmentation during ischemia in neonatal rat ventricular cardiomyocytes using various experimental techniques including Western blot and TUNEL assays.
Limitations
The study primarily focuses on neonatal rat cardiomyocytes, which may not fully represent adult human cardiomyocyte behavior.
Participant Demographics
Neonatal rat ventricular cardiomyocytes were used in the experiments.
Digital Object Identifier (DOI)
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