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Nuclear localization of endothelin-converting enzyme-1: subisoform specificity
Farahdiba Jafri1, Adviye Ergul
1Clinical and Experimental Therapeutics Program, University of Georgia and Vascular Biology Center, Medical College of Georgia, Augusta, GA 30912, USA.
Arteriosclerosis, Thrombosis, and Vascular Biology
|October 11, 2003
Summary
Endothelin-converting enzyme-1 (ECE-1) subisoforms, including ECE-1a and ET-1, are found in the nucleus. Their localization shifts in high-glucose conditions, suggesting novel regulation of the endothelin system.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Endothelin-1 (ET-1) is a potent vasoconstrictor and mitogen.
- Its precursor, big ET-1, is processed by endothelin-converting enzyme-1 (ECE-1).
- ECE-1 has four subisoforms with distinct cellular localization.
Purpose of the Study:
- To investigate the intracellular trafficking and localization of ECE-1 subisoforms.
- To determine if ECE-1 subisoforms exhibit differential localization patterns.
- To explore the impact of high-glucose conditions on ECE-1 localization.
Main Methods:
- Utilized green fluorescent protein (GFP)-tagged recombinant ECE-1 subisoforms.
- Employed confocal microscopy to visualize enzyme localization.
- Studied localization in both transiently transfected and native endothelial cells.
Main Results:
- Demonstrated for the first time that ECE-1a and ET-1 are present in the nuclear compartment.
- Observed a shift of ECE-1a from the plasma membrane to intracellular compartments under high-glucose conditions.
- Found that the ECE-1b subisoform is primarily localized in the cytosol, indicating subisoform-specific nuclear targeting.
Conclusions:
- Established a novel localization pattern for the endothelin system components.
- Suggests that the ET system's localization is subject to differential regulation, particularly under pathophysiological conditions like hyperglycemia.