Effects of redox-related congeners of NO on apoptosis and caspase-3 activity

Nitric Oxide : Biology and Chemistry
J HaendelerS Dimmeler

Abstract

Nitric oxide has been shown to inhibit apoptosis of human umbilical venous endothelial cells (HUVEC). Therefore we investigated the effect of different NO donors, PAPA NONOate (NOC-15; NO.) and nitrosodium tetrafluoroborate (NOBF4, NO+), and the reaction product of NO and O2-, peroxynitrite (ONOO- ), on TNF-alpha- or serum depletion-induced apoptosis of HUVEC. TNF-alpha-induced DNA fragmentation, determined by ELISA, was inhibited by NOC-15, NOBF4, and ONOO- in a concentration-dependent manner (maximal effects with 10 microM NO. and ONOO- and 100 microM NO+). The inhibition of apoptosis correlated with a protective effect on cell viability. The caspases, a cysteine protease family, play an important role in apoptotic processes. To determine whether the different NO donors and ONOO- regulate this enzyme, caspase-3-like activity was measured in homogenates of TNF-alpha-treated HUVEC. The TNF-alpha-induced enzyme activity was abrogated by NO., NO+, and ONOO-. Furthermore, caspase-3 activity was determined in vitro by reconstitution of the separately cloned, bacterially expressed, and purified active p17 and p12 subunits. The reconstituted caspase-3 exhibited enzyme activity, which was suppressed by the different NO donors and ONOO...Continue Reading

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