Abstract:
:A series of 1-methyl-1H-pyrazole-5-carboxamides were synthesized as potent inhibitors of the parasitic nematode of sheep, Haemonchus contortus. These compounds did not show overt cytotoxicity to a range of mammalian cell lines under standard in vitro culture conditions, had high selectivity indices, and were progressed to an acute toxicity study in a rodent model. Strikingly, acute toxicity was observed in mice. Experiments measuring cellular respiration showed a dose-dependent inhibition of mitochondrial respiration. Under these conditions, potent cytotoxicity was observed for these compounds in rat hepatocytes suggesting that the potent acute mammalian toxicity of this chemotype is most likely associated with respiratory inhibition. In contrast, parasite toxicity was not correlated to acute toxicity or cytotoxicity in respiring cells. This paper highlights the importance of identifying an appropriate in vitro predictor of in vivo toxicity early on in the drug discovery pipeline, in particular assessment for in vitro mitochondrial toxicity.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Preston S,Garcia-Bustos J,Hall LG,Martin SD,Le TG,Kundu A,Ghoshal A,Nguyen NH,Jiao Y,Ruan B,Xue L,Huang F,Chang BCH,McGee SL,Wells TNC,Palmer MJ,Jabbar A,Gasser RB,Baell JBdoi
10.1021/acs.jmedchem.0c01793subject
Has Abstractpub_date
2021-01-14 00:00:00pages
840-844issue
1eissn
0022-2623issn
1520-4804journal_volume
64pub_type
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