Onchocerca volvulus Molting Inhibitors Identified through Scaffold Hopping

Area of Science:

• Medicinal Chemistry
• Parasitology
• Drug Discovery

Background:

• Onchocerciasis, caused by Onchocerca volvulus, is a debilitating infectious disease.
• The anthelmintic drug closantel shows potential in inhibiting the L3 larval stage of O. volvulus.
• There is a need for alternative therapeutic scaffolds with improved efficacy.

Purpose of the Study:

• To discover novel chemotypes with enhanced chitinase inhibitory properties.
• To identify alternative compounds to closantel for abrogating O. volvulus L3 molting.
• To evaluate the potential of urea-tropolones as inhibitors of O. volvulus L3 molting.

Main Methods:

• Fragment replacement and modification approach.
• Synthesis of novel chemotypes.
• Evaluation of chitinase inhibitory activity.
• Assessment of O. volvulus L3 molting inhibition.

Main Results:

• Novel chemotypes with improved chitinase inhibitory properties were generated.
• Urea-tropolones demonstrated potent inhibition of O. volvulus L3 molting.
• These compounds represent promising alternatives to existing anthelmintics.

Conclusions:

• Urea-tropolones are identified as potent inhibitors of Onchocerca volvulus L3 molting.
• This discovery offers a new avenue for developing treatments against onchocerciasis.
• The fragment-based approach successfully yielded novel therapeutic candidates.