Identification of dehydroxy isoquine and isotebuquine as promising antileishmanial agents.

Authors:
Angel H Romero
Angel H Romero
Laboratorio de Química Medicinal y Heterociclos
Noris Rodriguez
Noris Rodriguez
University of Illinois at Urbana-Champaign
United States
Henry Oviedo
Henry Oviedo
Laboratorio de Ingeniería Genética

Arch Pharm (Weinheim) 2019 May 17;352(5):e1800281. Epub 2019 Apr 17.

Laboratorio de Ingeniería Genética, Instituto de Biomedicina, Facultad de Medicina, Universidad Central de Venezuela, Caracas, Venezuela.

Traditional antimalarial drugs based on 4-aminoquinolines have exhibited good antiproliferative activities against Leishmania parasites; however, their clinical use is currently limited. To identify new 4-aminoquinolines to combat American cutaneous leishmaniasis, we carried out a full in vitro evaluation of a series of dehydroxy isoquines and isotebuquines against two Leishmania parasites such as Leishmania braziliensis and Leishmania mexicana. First, the antiproliferative activity of the quinolines was studied against the promastigote forms of L. braziliensis and L. mexicana parasites, finding that five of them exhibited good antileishmanial responses with micromolar IC values ranging from 3.84 to 10 μM. A structure-activity relationship analysis gave evidence that a piperidine or a morpholine attached as N-alkyamino terminal substituent as well as the inclusion of an extra phenyl ring attached at the aniline ring of the isotebuquine core constitute important pharmacophores to generate the most active derivatives, with antileishmanial responses by far superior to those found for the reference drug, glucantime. All compounds showed a relatively low toxicity on human dermis fibroblasts, with CC ranging from 69 to >250 μM. The five most active compounds displayed moderate to good antileishmanial activity against the intracellular amastigote form of L. braziliensis, compared to the reference drug. In particular, compound 2j was identified as the most potent agent against antimony-resistant amastigotes of L. braziliensis with acceptable biological response and selectivity, emerging as a promising candidate for further in vivo antileishmanial evaluation. Diverse mechanism-of-action studies and molecular docking simulations were performed for the most active 4-aminoquinoline.

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https://onlinelibrary.wiley.com/doi/abs/10.1002/ardp.2018002
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http://dx.doi.org/10.1002/ardp.201800281DOI Listing
May 2019
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References

(Supplied by CrossRef)
Article in J. Vector Borne Dis
Sharma U. et al.
J. Vector Borne Dis 2008

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