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CHOP deficiency inhibits methylglyoxal-induced endothelial dysfunction
Yoon Young Choi1, Suji Kim2, Jung-Hwa Han2
1Department of Biochemistry and Molecular Biology, Yeungnam University College of Medicine, 317-1, Daemyung-dong, Daegu, Republic of Korea.
Biochemical and Biophysical Research Communications
|November 6, 2016
Summary
Methylglyoxal (MGO), a metabolite linked to diabetes, causes endothelial dysfunction by triggering ER stress. Inhibiting CHOP, a key protein, shows therapeutic potential for diabetic cardiovascular complications.
Area of Science:
- Biochemistry
- Molecular Biology
- Cardiovascular Research
Background:
- Diabetic patients face higher risks of cardiovascular complications and endothelial dysfunction.
- Methylglyoxal (MGO), a glycolytic metabolite, is implicated more strongly than glucose in causing endothelial dysfunction.
Purpose of the Study:
- To investigate the molecular mechanisms of MGO-induced endothelial dysfunction, focusing on endoplasmic reticulum (ER) stress.
- To explore the role of C/EBP homologous protein (CHOP) in MGO-mediated endothelial damage.
Main Methods:
- Utilized biochemical assays to assess protein cleavage (PARP-1, caspase-3) and cell apoptosis.
- Employed small interfering RNA (siRNA) to deplete CHOP and specific inhibitors (4-PBA, SP600125) to block ER stress and JNK pathways.
- Validated findings in a CHOP-deficient mouse model subjected to MGO infusion.
Main Results:
- 4-PBA treatment inhibited MGO-induced protein cleavage.
- Endothelial apoptosis under high glucose conditions was exacerbated by a GLO1 inhibitor, highlighting endogenous MGO's role.
- MGO-induced apoptosis was reduced by CHOP depletion but not by JNK inhibition.
- CHOP-deficient mice exhibited reduced MGO-induced aortic endothelial dysfunction compared to controls.
Conclusions:
- Methylglyoxal (MGO) induces endothelial dysfunction through a mechanism dependent on C/EBP homologous protein (CHOP)-mediated ER stress.
- CHOP plays a critical role in MGO-induced endothelial damage, independent of the JNK pathway.
- Targeting CHOP presents a potential therapeutic strategy for mitigating diabetic cardiovascular complications.
