Cloning and functional expression of human endothelin-converting enzyme cDNA

Area of Science:

• Biochemistry
• Molecular Biology
• Cardiovascular Research

Background:

• Endothelin (ET) is a potent vasoconstrictor peptide derived from big endothelin (big ET).
• Endothelin-converting enzyme (ECE) is responsible for processing big ET into mature ET.
• Understanding ECE function is crucial for regulating vascular tone.

Purpose of the Study:

• To clone and characterize the cDNA encoding human endothelin-converting enzyme (ECE).
• To investigate the functional expression and enzymatic activity of human ECE.
• To compare human ECE with its counterparts in other species.

Main Methods:

• Cloning of human ECE cDNA from human umbilical vein endothelial cells (HUVEC).
• Functional expression of human ECE in COS-1 cells.
• Immunoblot analysis using a monoclonal antibody against rat lung ECE.
• Enzymatic assays to measure the conversion of big ET-1 by ECE.

Main Results:

• A cDNA encoding a 758-amino acid human ECE was successfully cloned.
• Human ECE shares high homology with rat and bovine ECE.
• Immunoreactive human ECE protein was detected in HUVEC and transfected COS-1 cells.
• COS-1 cells expressing human ECE efficiently converted big ET-1.

Conclusions:

• The study successfully identified and characterized human endothelin-converting enzyme (ECE).
• The cloned human ECE is functionally active and exhibits high homology to other species.
• This research provides a basis for further investigation into ET's role in cardiovascular physiology and pathology.