Ferreira, Daiane D.
Sousa, Fernanda S.
Costa-Silva, Thais A.
Reimao, Juliana Q.
Torrecilhas, Ana C.
Johns, Deidre M.
Sear, Claire E.
Honorio, Kathia M.
Lago, Joao Henrique G.
Anderson, Edward A.
Tempone, Andre G.
Total Authors: 11
 Adolfo Lutz Inst, Ctr Parasitol & Mycol, BR-01246000 Sao Paulo - Brazil
 Univ Fed Sao Paulo, Inst Environm Chem & Pharmaceut Sci, BR-09972270 Diadema - Brazil
 Fed Univ ABC, Ctr Nat & Human Sci, BR-09210580 Santo Andre - Brazil
 Fac Med Jundiai, Rua Francisco Telles, 250 Vila Arens 2, BR-13202550 Jundiai, SP - Brazil
 Oregon State Univ, Carlson Coll Vet Med, Dept Biomed Sci, Corvallis, OR 97331 - USA
 Univ Oxford, Chem Res Lab, 12 Mansfield Rd, Oxford OX1 3TA - England
 Univ Sao Paulo, Escola Artes Ciencias & Humanidades, BR-03828000 Sao Paulo - Brazil
Total Affiliations: 7
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY;
AUG 15 2019.
Web of Science Citations:
Chagas disease is a neglected protozoan disease that affects more than eight million people in developing countries. Due to the limited number and toxicity profiles of therapies in current use, new drugs are urgently needed. In previous studies, we reported the isolation of two related antitrypanosomal neolignans from Nectandra leucantha (Lauraceae). In this work, a semi-synthetic library of twenty-three neolignan derivatives was prepared to explore synthetically accessible structure activity relationships (SAR) against Trypanosoma cruzi. Five compounds demonstrated activity against trypomastigotes (IC50 values from 8 to 64 mu M) and eight showed activity against intracellular amastigotes (IC50 values from 7 to 16 M). Eighteen derivatives demonstrated no mammalian cytotoxicity up to 200 mu M. The phenolic acetate derivative of natural dehydrodieugenol B was effective against both parasite forms and eliminated 100% of amastigotes inside macrophages. This compound caused rapid and intense depolarization of the mitochondrial membrane potential, with decreased levels of intracellular reactive oxygen species being observed. Fluorescence assays demonstrated that this derivative affected neither the permeability nor the electric potential of the parasitic plasma membrane, an effect also corroborated by scanning electron microscopy studies. Structure-activity relationship studies (SARs) demonstrated that the presence of at least one allyl side chain on the biaryl ether core was important for antitrypanosomal activity, and that the free phenol is not essential. This set of neolignan derivatives represents a promising starting point for future Chagas disease drug discovery studies. (C) 2019 Elsevier Masson SAS. All rights reserved. (AU)