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Induction of endothelial apoptosis by 4-hydroxyhexenal
Ji Young Lee1, Jeong Hwan Je, Dae Hyun Kim
1Genetic Engineering Research Institute, Pusan National University, Busan, Korea.
European Journal of Biochemistry
|March 20, 2004
Summary
4-hydroxyhexenal (HHE) triggers endothelial cell apoptosis via reactive oxygen and peroxynitrite generation, contributing to vascular dysfunction and aging. Antioxidants block this process, highlighting oxidative stress in vascular degeneration.
Area of Science:
- Biochemistry
- Cell Biology
- Vascular Biology
Background:
- Lipid peroxidation products, like 4-hydroxy-2-nonenal (HNE) and 4-hydroxyhexenal (HHE), impact redox balance during aging and degenerative diseases.
- Endothelial cell dysfunction is a key factor in vascular dysfunction.
- The precise mechanism of HHE-induced endothelial cell apoptosis remains largely unknown.
Purpose of the Study:
- To investigate the role of peroxynitrite (ONOO(-)) in HHE-induced apoptosis of endothelial cells.
- To elucidate the signaling pathways involved in HHE-mediated endothelial cell death.
Main Methods:
- Endothelial cells were treated with HHE.
- Apoptosis was assessed by measuring changes in Bax and Bcl-2 expression.
- Reactive oxygen species (ROS), nitric oxide, and ONOO(-) generation were quantified.
- Confocal laser microscopy was used to visualize ONOO(-) levels.
- The effects of N-acetyl cysteine (ROS scavenger) and penicillamine (ONOO(-) scavenger) were evaluated.
Main Results:
- HHE induced endothelial cell apoptosis by upregulating apoptotic Bax and downregulating anti-apoptotic Bcl-2.
- HHE treatment led to increased generation of ROS, nitric oxide, and ONOO(-), causing redox imbalance.
- N-acetyl cysteine and penicillamine effectively blocked HHE-mediated apoptosis and reduced intracellular ONOO(-) levels.
Conclusions:
- HHE triggers endothelial apoptosis through the generation of reactive species, particularly peroxynitrite.
- This HHE-induced oxidative stress contributes to endothelial cell death, vascular dysfunction, and vascular aging.
- Targeting reactive species may offer therapeutic strategies for age-related vascular diseases.