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Processing of proendothelin-1 by human furin convertase
J B Denault1, A Claing, P D'Orléans-Juste
1Department of Pharmacology, Medical School, Kyoto University, Japan.
FEBS Letters
|April 10, 1995
Summary
Furin, a mammalian enzyme, processes the precursor protein to produce big endothelin-1 (bigET-1), which is then converted to active endothelin-1 (ET-1). Inhibiting furin stops ET-1 production in endothelial cells.
Area of Science:
- Biochemistry
- Molecular Biology
- Endocrinology
Background:
- Endothelin-1 (ET-1) is a potent vasoactive peptide involved in cardiovascular regulation.
- ET-1 is synthesized as an inactive precursor (proET-1) requiring sequential proteolytic cleavage for activation.
- The endothelin converting enzyme (ECE) is known to process bigET-1 into active ET-1.
Purpose of the Study:
- To investigate the role of furin in the initial processing of proET-1 to bigET-1.
- To determine if furin contributes to the generation of biologically active ET-1.
- To assess the effect of furin inhibition on ET-1 production in endothelial cells.
Main Methods:
- In vitro cleavage assays using proET-1 and purified furin.
- Biochemical characterization of cleavage products.
- Treatment of endothelial cells with a specific furin inhibitor (decanoyl-Arg-Val-Lys-Arg chloromethylketone).
- Measurement of ET-1 production in treated endothelial cells.
Main Results:
- Furin efficiently cleaved proET-1 in vitro to generate bigET-1.
- Subsequent processing of bigET-1 resulted in the formation of biologically active ET-1.
- The furin inhibitor significantly abolished ET-1 production in endothelial cells, confirming furin's essential role.
Conclusions:
- Furin acts as a key enzyme in the initial step of ET-1 precursor processing, generating bigET-1.
- This study elucidates a novel pathway for ET-1 biosynthesis involving furin.
- Targeting furin may represent a therapeutic strategy for conditions associated with ET-1 overproduction.