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• W2085133295 abstract "Human soluble calcium-activated nucleotidase (human SCAN) is a homologue of the salivary anti-coagulant apyrases injected by insects into their hosts to allow blood feeding. However, the human enzyme, unlike its insect counterparts, does not efficiently hydrolyze the platelet agonist, ADP. By site-directed mutagenesis, two mutant human SCANs were constructed and expressed in bacteria. Following refolding from inclusion bodies and purification, these enzymes were assessed for anti-coagulant and anti-thrombotic efficacy. These engineered proteins include both active site mutations and a dimer interface mutation to increase the stability and ADPase activity of the modified human nucleotidase. The ADPase activity of these mutants increased more than ten fold. The E130Y/K201M/E216M SCAN mutant efficiently inhibited platelet aggregation in vitro. In addition, the E130Y/K201M/T206K/T207E/E216M mutant inhibited jugular vein thrombosis in the murine ferric chloride-induced model of thrombosis, as assessed by laser Doppler blood flow measurements. The bed bug insect homologue of human SCAN was also expressed and purified, and used in these in vivo experiments as a benchmark to assess the therapeutic potential of the engineered human enzymes. The most active modified human enzyme was able to completely inhibit the thrombosis induced by ferric chloride at roughly double the protein dose used for the bed bug enzyme. Thus, for the first time, we show that an engineered form of this human protein is efficacious in an in vivo model of thrombosis, demonstrating that suitably modified human SCAN enzymes have therapeutic potential as anti-coagulant and anti-thrombotic therapeutic agents. This suggests their utility in future treatment strategies for thrombotic cardiovascular diseases, including myocardial infarctions and ischemic strokes." @default.
• W2085133295 created "2016-06-24" @default.
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• W2085133295 date "2008-01-01" @default.
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• W2085133295 title "Engineered human soluble calcium-activated nucleotidase inhibits coagulation in vitro and thrombosis in vivo" @default.
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• W2085133295 doi "https://doi.org/10.1016/j.thromres.2007.12.002" @default.
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