Riluzole-Rasagiline Hybrids: Toward the Development of Multi-Target-Directed Ligands for Amyotrophic Lateral Sclerosis
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Polypharmacology is a new trend in amyotrophic lateral sclerosis (ALS) therapy and an effective way of addressing a multifactorial etiology involving excitotoxicity, mitochondrial dysfunction, oxidative stress, and microglial activation. Inspired by a reported clinical trial, we converted a riluzole ()-rasagiline () combination into single-molecule multi-target-directed ligands. By a ligand-based approach, the highly structurally integrated hybrids - were designed and synthesized. Through a target- and phenotypic-based screening pipeline, we identified hit compound . It showed monoamine oxidase A (MAO-A) inhibitory activity (IC = 6.9 μM) rationalized by studies as well as brain permeability. By using neuronal and non-neuronal cell models, including ALS-patient-derived cells, we disclosed for a neuroprotective/neuroinflammatory profile similar to that of the parent compounds and their combination. Furthermore, the unexpected MAO inhibitory activity of (IC = 8.7 μM) might add a piece to the puzzle of its anti-ALS molecular profile.