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Imidazole Bioisostere Activators of Endopeptidase Neurolysin with Enhanced Potency and Metabolic Stability.
ACS Medicinal Chemistry Letters 2024 April 12
The peptidase neurolysin (Nln) has been validated as a potential target for developing therapeutics for ischemic stroke (IS). Overexpression of Nln in a mouse model of IS provides significant cerebroprotection, leading to reduced infarction size and edema volume. Pharmacological inhibition of Nln in the post-stroke brain worsens neurological outcomes. A virtual screen identified dipeptide small-molecule activators of Nln. Optimization studies resulted in a class of peptidomimetic compounds with promising activity. However, these compounds still possessed an amide bond that compromised their stability in plasma and the brain. Herein, we report the synthesis and characterization of a series of amide bioisosteres based on our peptidomimetic leads. Imidazole-based bioisosteres afford scaffolds with increased potency to activate Nln combined with enhanced mouse plasma stability and significantly better brain permeability over the original dipeptide hits.
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