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"HETE"ing up mitochondria in human heart failure
1Division of Cardiovascular Medicine, Department of Medicine, The University of Virginia School of Medicine, Charlottesville, Virginia 22908.
The Journal of Biological Chemistry
|January 7, 2018
Summary
Phospholipase iPLA2γ contributes to heart failure by altering mitochondrial function. New research shows changes in PLA2 isoforms in failing hearts promote harmful mPTP opening, impacting cardiac homeostasis.
Area of Science:
- Cardiovascular Biology
- Mitochondrial Research
- Enzymology
Background:
- Phospholipase iPLA2γ (icanine phospholipase A2 group VI) is implicated in heart failure.
- Mechanisms linking iPLA2γ to cardiomyocyte dysfunction and mitochondrial permeability transition pore (mPTP) opening remain unclear.
Purpose of the Study:
- To investigate the role of iPLA2γ and other phospholipase A2 (PLA2) isoforms in the context of heart failure.
- To elucidate the interaction between PLA2 activity and mPTP opening in failing cardiomyocytes.
Main Methods:
- Analysis of PLA2 isoform expression in mitochondria from failing hearts.
- Assessment of eicosanoid composition shifts.
- Evaluation of the impact on mitochondrial permeability transition pore (mPTP) opening.
Main Results:
- Mitochondria in failing hearts exhibit dynamic shifts in PLA2 isoform expression.
- These shifts lead to altered eicosanoid profiles within mitochondria.
- The observed changes contribute to pathological mPTP opening, a key event in heart failure.
Conclusions:
- Dynamic changes in PLA2 isoforms and eicosanoid metabolism in mitochondria are critical in heart failure pathogenesis.
- iPLA2γ and associated PLA2 activities play a significant role in regulating mPTP opening and cardiac dysfunction.