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Orally Active 7-Substituted (4-Benzyl-phthalazin-1-yl)-2-methyl-piperazin-1-yl]-nicotinonitriles as Active-site Inhibitors of Sphingosine-1-Phosphate Lyase for the Treatment of Multiple Sclerosis

Weiler, Sven and Braendlin, Nadine and Beerli, Christian and Bergsdorf, Christian and Schubart Wellensiek, Anna and Srinivas, Honnappa and Oberhauser, Berndt and Billich, Andreas (2014) Orally Active 7-Substituted (4-Benzyl-phthalazin-1-yl)-2-methyl-piperazin-1-yl]-nicotinonitriles as Active-site Inhibitors of Sphingosine-1-Phosphate Lyase for the Treatment of Multiple Sclerosis. Journal of Medicinal Chemistry, 57 (12). pp. 5074-5084. ISSN 0022-26231520-4804

Abstract

Sphingosine-1-phosphate (S1P) lyase has recently been implicated as a therapeutic target for the treatment of multiple sclerosis (MS), based on studies in a genetic mouse model. Potent active-site directed inhibitors of the enzyme are not known so far. Here we describe the discovery of (4-benzyl-phthalazin-1-yl)-2-methyl-piperazin-1-yl]-nicotinonitrile 1 in a high-throughput screen using a biochemical assay, and its further optimization. This class of compounds was found to inhibit catalytic activity of S1PL by binding to the active site of the enzyme, as seen in the co-crystal structure of derivative 15 with the homodimeric human S1P lyase. 15 induces profound reduction of peripheral T cell numbers after oral dosage and confers pronounced protection in a rat model of multiple sclerosis . In conclusion, this novel class of direct S1P lyase inhibitors provides excellent tools to further explore the therapeutic potential of T cell-targeted therapies in multiple sclerosis and other autoimmune and inflammatory diseases.

Item Type: Article
Keywords: Experimental autoimmune encephalomyelitis; Lyase; Multiple Sclerosis; Sphingosine-1-phosphate; T cells.
Date Deposited: 27 Apr 2016 23:45
Last Modified: 27 Apr 2016 23:45
URI: https://oak.novartis.com/id/eprint/20721

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