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- W2110403454 abstract "The in vivo efficacy of many therapeutic peptides is hampered by their rapid proteolytic degradation. Cyclization of these therapeutic peptides is an excellent way to render them more resistant against breakdown. Here, we describe the enzymatic introduction of a thioether ring in angiotensin [Ang-(1-7)], a heptapeptide that plays a pivotal role in the renin-angiotensin system and possesses important therapeutic activities. The lactic acid bacterium Lactococcus lactis, equipped with the plasmid-based nisin modification machinery, was used to produce thioether-bridged Ang-(1-7). The resulting cyclized Ang-(1-7) is fully resistant against purified angiotensin-converting enzyme, has significantly increased stability in homogenates of different organs and in plasma derived from pig, and displays a strongly (34-fold) enhanced survival in Sprague-Dawley (SD) rats in vivo. With respect to functional activity, cyclized Ang-(1-7) induces relaxation of precontracted SD rat aorta rings in vitro. The magnitude of this effect is 2-fold larger than that obtained for natural Ang-(1-7). The Ang-(1-7) receptor antagonist D-Pro(7)-Ang-(1-7), which completely inhibits the activity of natural Ang-(1-7), also abolishes the vasodilation by cyclized Ang-(1-7), providing evidence that cyclized Ang-(1-7) also interacts with the Ang-(1-7) receptor. Taken together, applying a highly innovative enzymatic peptide stabilization method, we generated a stable Ang-(1-7) analog with strongly enhanced therapeutic potential." @default.
- W2110403454 created "2016-06-24" @default.
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- W2110403454 date "2009-03-01" @default.
- W2110403454 modified "2023-09-27" @default.
- W2110403454 title "Angiotensin-(1-7) with thioether bridge: an angiotensin-converting enzyme-resistant, potent angiotensin-(1-7) analog." @default.
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- W2110403454 doi "https://doi.org/10.1124/jpet.108.146431" @default.
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