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• W2081041878 abstract "Nucleoside di- and triphosphates and adenosine regulate several components of the mucocilairy clearance process (MCC) that protects the lung against infections, via activation of epithelial purinergic receptors. However, assessing the contribution of individual nucleotides to MCC functions remains difficult due to the complexity of the mechanisms of nucleotide release and metabolism. Enzymatic activities involved in the metabolism of extracellular nucleotides include ecto-ATPases and secreted nucleoside diphosphokinase (NDPK) and adenyl kinase, but potent and selective inhibitors of these activities are sparse. In the present study, we discovered that ebselen markedly reduced NDPK activity while having negligible effect on ecto-ATPase and adenyl kinase activities. Addition of radiotracer [γ(32)P]ATP to human bronchial epithelial (HBE) cells resulted in rapid and robust accumulation of [(32)P]-inorganic phosphate ((32)Pi). Inclusion of UDP in the incubation medium resulted in conversion of [γ(32)P]ATP to [(32)P]UTP, while inclusion of AMP resulted in conversion of [γ(32)P]ATP to [(32)P]ADP. Ebselen markedly reduced [(32)P]UTP formation but displayed negligible effect on (32)Pi or [(32)P]ADP accumulations. Incubation of HBE cells with unlabeled UTP and ADP resulted in robust ebselen-sensitive formation of ATP (IC(50) = 6.9 ± 2 μM). This NDPK activity was largely recovered in HBE cell secretions and supernatants from lung epithelial A549 cells. Kinetic analysis of NDPK activity indicated that ebselen reduced the V(max) of the reaction (K(i) = 7.6 ± 3 μM), having negligible effect on K(M) values. Our study demonstrates that ebselen is a potent non-competitive inhibitor of extracellular NDPK." @default.
• W2081041878 created "2016-06-24" @default.
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• W2081041878 date "2010-11-03" @default.
• W2081041878 modified "2023-09-27" @default.
• W2081041878 title "Ebselen is a potent non-competitive inhibitor of extracellular nucleoside diphosphokinase" @default.
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• W2081041878 doi "https://doi.org/10.1007/s11302-010-9203-x" @default.
• W2081041878 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3033502" @default.
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