New 9-aminoacridine derivatives as inhibitors of botulinum neurotoxins and P. falciparum malaria

Abstract

Steroidal and adamantane aminoacridine derivatives were prepared and tested as both botulinum neurotoxin (BoNT) inhibitors and antimalarials. Steroid-bound acridines provided good potency against both the BoNT/A and BoNT/B light chains (LCs). The observed inhibition of the BoNT/B LC by ca. 50 %is the highest attained inhibitory activity against this serotype by acridine-based compounds to date. With respect to the antimalarial activity, the adamantane acridines were the most potent derivatives (IC50 = 6-9 nM, SI > 326), indicating that an adamantyl group is a better carrier than a steroidal motif for this indication. Copyright 2013 (CC) SCS.