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Medium-Ring Keto Bislactams with Antischistosomal Activity.

Rongguo Ren1, Derek A Leas1, Cécile Häberli2,3

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Researchers identified novel medium-ring keto bislactams as a promising new class of antischistosomal drugs. Key structural features were essential for activity against Schistosoma mansoni, with two compounds showing high efficacy.

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Area of Science:

  • Medicinal Chemistry
  • Parasitology
  • Drug Discovery

Background:

  • Schistosomiasis remains a significant global health burden, necessitating the development of new therapeutic agents.
  • Existing treatments face challenges including resistance and side effects, driving the search for novel chemotypes.
  • Antischistosomal drug discovery requires identification of compounds with potent activity and favorable pharmacokinetic profiles.

Purpose of the Study:

  • To discover and characterize a new class of antischistosomal compounds.
  • To investigate the structure-activity relationships of medium-ring keto bislactams against Schistosoma mansoni.
  • To evaluate the physicochemical properties and cytotoxicity of these novel compounds.

Main Methods:

  • Synthesis and chemical characterization of medium-ring keto bislactams.
  • In vitro screening against Schistosoma mansoni.
  • Assessment of physicochemical properties including LogD7.4 and aqueous solubility.
  • Cytotoxicity evaluation using relevant cell lines.

Main Results:

  • Medium-ring keto bislactams were identified as a novel antischistosomal chemotype.
  • The ketone functional group and isoindolinone substructure are crucial for antischistosomal activity.
  • Compounds exhibited favorable physicochemical properties: LogD7.4 (<0 to 2.4) and kinetic aqueous solubility (40 to >320 μM).
  • Low cytotoxicity was observed (IC50s: 52 to >390 μM), with two compounds showing potent activity (IC50 < 5 μM) against ex vivo S. mansoni.

Conclusions:

  • Medium-ring keto bislactams represent a promising new chemical scaffold for antischistosomal drug development.
  • Optimized aryl substitution is key to maintaining chemical stability and enhancing antischistosomal efficacy.
  • The identified lead compounds possess a favorable balance of potency, solubility, and low toxicity, warranting further investigation.