Key result
Superoxide inhibits endothelin-converting enzyme activity and decreases endothelin-1 synthesis by ejecting zinc from the enzyme, whereas hydrogen peroxide and nitric oxide do not.
Why the study?
Does superoxide inhibit endothelin-converting enzyme activity and decrease endothelin-1 synthesis?
Does superoxide inhibit endothelin-converting enzyme activity and decrease endothelin-1 synthesis?
Superoxide may protect the vasculature by inhibiting endothelin-converting enzyme via zinc ejection, highlighting a novel regulatory mechanism in blood vessel biology.
Answers are grounded in this paper and cite their sources.
Superoxide may protect vessels via endothelin-converting enzyme inhibition in animals; leaves open relevance to human endothelial function.
Reactive oxygen species (ROS) act as signaling molecules in the cardiovascular system, regulating cellular proliferation and migration. However, an excess of ROS can damage cells and alter endothelial cell function. We hypothesized that endogenous mechanisms protect the vasculature from excess levels of ROS. We now show that superoxide can inhibit endothelin-converting enzyme activity (ECE) and decrease endothelin-1 synthesis. Superoxide inhibits ECE but hydrogen peroxide and nitric oxide do not. Superoxide inhibits ECE by ejecting zinc from the enzyme, and the addition of exogenous zinc restores enzymatic activity. Superoxide may inhibit other zinc metalloproteinases by a similar mechanism and may thus play an important role in regulating the biology of blood vessels.
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López‐Ongil et al. (2000) studied Endothelial cell function. Superoxide vs. Hydrogen peroxide and nitric oxide was evaluated on Endothelin-converting enzyme (ECE) activity and endothelin-1 synthesis. Superoxide inhibits endothelin-converting enzyme activity and decreases endothelin-1 synthesis by ejecting zinc from the enzyme, whereas hydrogen peroxide and nitric oxide do not.
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