title: Approved oncology drugs lack in vivo activity against Trichuris muris despite in vitro activity.
abstract: Infections with soil-transmitted helminths (STHs) are considered among the most persistent global health problems. The few available drugs have limitations including low efficacy against Trichuris trichiura infections. As a starting point toward drug repositioning, we studied a set of FDA-approved oncology drugs for activity against Trichuris muris since targets relevant to cancer therapy might have a function in helminth biology. Drugs were tested in vitro on the larval and adult stage of T. muris. Compounds active in vitro were tested in the T. muris mouse model at single oral dosages of 200-400 mg/kg. Of the 114 drugs tested in vitro, 12 showed activity against T. muris larvae (>80 % drug effect at 50 μM). Ten of these drugs were also active on the adult worm stage (>80 % drug effect at 50 μM), of which six revealed IC50values between 1.8 and 5.0 μM. Except for tamoxifen citrate, all in vitro active drugs were protein kinase inhibitors. None of the drugs tested in vivo showed efficacy, revealing worm burden reductions of 0-24 % and worm expulsion rates of 0-7.9 %. The promising in vitro activities of protein kinases could not be confirmed in vivo. Drug discovery against STH should be strengthened including the definition of compound progression criteria. Follow-up structure-activity relationship studies with modified compounds might be considered.
authors: Swiss Tropical and Public Health Institute, P.O. Box CH-4002, Basel, Switzerland.|University of Basel, P.O. Box CH-4003, Basel, Switzerland.
authors: Noemi
authors: N
authors: Cowan
authors: Swiss Tropical and Public Health Institute, P.O. Box CH-4002, Basel, Switzerland.|University of Basel, P.O. Box CH-4003, Basel, Switzerland.
authors: Alessia
authors: A
authors: Raimondo
authors: Swiss Tropical and Public Health Institute, P.O. Box CH-4002, Basel, Switzerland. jennifer.keiser@unibas.ch.|University of Basel, P.O. Box CH-4003, Basel, Switzerland. jennifer.keiser@unibas.ch.
authors: Jennifer
authors: J
authors: Keiser
mesh_terms: D000818:Animals; D000969:Antinematodal Agents / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000494:pharmacology*; D004195:Disease Models, Animal; D005260:Female; D007814:Larva / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D013329:Structure-Activity Relationship; D014257:Trichuriasis / Q000188:drug therapy* / Q000469:parasitology; D014258:Trichuris / Q000187:drug effects*
chemical_list: D000969:Antinematodal Agents; D000970:Antineoplastic Agents
keywords: Oncology drugs; Protein kinases; Trichuriasis; Trichuris muris