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TEK Downregulation Of LOX Propeptide: A Novel Mechanism For Endothelial Cell Protection Following Myocardial
Chao Li1, Muxin Zhang2, Mengkai Lu2
1College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China; Shandong Key Laboratory of Innovation and Application Research in Basic Theory of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China.
Researchers discovered a new mechanism of endothelial cell injury in myocardial infarction (MI). Inhibiting the TEK receptor tyrosine kinase (TEK) interaction with signal transducer and activator of transcription 3 (STAT3) may protect against damage.
Area of Science:
- Cardiovascular Biology
- Molecular Medicine
- Cellular Biology
Background:
- Endothelial dysfunction is key in cardiovascular diseases like myocardial infarction (MI).
- Reduced nitric oxide (NO) production by endothelial cells impairs coronary microcirculation.
- Identifying protective molecular mechanisms against endothelial injury is crucial for MI treatment.
Purpose of the Study:
- To investigate the novel interaction between TEK receptor tyrosine kinase (TEK) and signal transducer and activator of transcription 3 (STAT3).
- To elucidate the role of this interaction in endothelial cell injury and potential therapeutic strategies for MI.
Main Methods:
- Investigated TEK-STAT3 interaction using specific domain inhibitors.
- Utilized chromatin immunoprecipitation (ChIP) to analyze STAT3 binding to LOX and LOX-PP promoter regions.
- Assessed endothelial cell function, including NO synthesis, permeability, proliferation, migration, and tube formation.
Main Results:
- Identified a novel TEK-STAT3 interaction that promotes STAT3 phosphorylation and nuclear translocation.
- Inhibiting TEK-STAT3 binding prevented STAT3 and p-STAT3 upregulation.
- STAT3 was found to inhibit the transcription of lysyl oxidase (LOX) and LOX propeptide (LOX-PP).
- Excessive LOX-PP was linked to endothelial cell injury, reduced NO synthesis, and impaired endothelial function.
Conclusions:
- Discovered a new molecular mechanism of endothelial cell injury following myocardial ischemia involving the TEK-STAT3-LOX pathway.
- Targeting the TEK-STAT3 interaction offers a potential therapeutic avenue for MI by mitigating endothelial dysfunction.
