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Optimization of the Potency of Pyrazolopyrimidine MALT1 Protease Inhibitors by Reducing Metabolism and Increasing Potency in Whole Blood. | LitMetric

AI Article Synopsis

Article Abstract

The paracaspase MALT1 has gained increasing interest as a target for the treatment of subsets of lymphomas as well as autoimmune diseases, and there is a need for suitable compounds to explore the therapeutic potential of this target. Here, we report the optimization of the potency of pyrazolopyrimidines, a class of highly selective allosteric MALT1 inhibitors. High doses of the initial lead compound led to tumor stasis in an activated B-cell-like (ABC) diffuse large B-cell lymphoma (DLBCL) xenograft model, but this compound suffered from a short half-life and suboptimal potency in whole blood. Guided by metabolism studies, we identified compounds with reduced metabolic clearance and increased half-life. In the second optimization step, masking one of the hydrogen-bond donors of the central urea moiety through an intramolecular interaction led to improved potency in whole blood. This was associated with improved potency in a mechanistic model of B cell activation. The optimized compound led to tumor regression in a CARD11 mutant ABC-DLBCL lymphoma xenograft model.

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http://dx.doi.org/10.1021/acs.jmedchem.0c01246DOI Listing

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