Structure and antiparasitic activity relationship of alkylphosphocholine analogues against Leishmania donovani

Humera Ahmed, Katherine C. Carter, Roderick A.M. Williams*

*Corresponding author for this work

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Abstract

Miltefosine (Milt) is the only oral treatment for visceral leishmaniasis (VL) but its use is associated with adverse effects e.g. teratogenicity, vomiting, diarrhoea. Understanding how its chemical structure induces cytotoxicity, whilst not compromising its anti-parasitic efficacy, could identify more effective compounds. Therefore we systemically modified the compound’s head, tail and linker tested the in vitro activity of three alkylphosphocholines (APC) series against Leishmania donovani strains with different sensitivities to antimony. The analogue, APC12, with an alkyl carbon chain of 12 atoms, was also tested for anti-leishmanial in vivo activity in a murine VL model. All APCs produced had anti-leishmanial activity in the micromolar range (IC50 and IC90, 0.46 µM - >82.21 µM and 4.14 µM - 739.89 µM; 0.01 - >8.02 µM and 0.09 µM - 72.18 µM respectively against promastigotes and intracellular amastigotes). The analogue, APC12 was the most active, was 4-10 fold more effective than the parent miltefosine molecule (Milt, APC16), irrespective of the strain’s sensitivity to antimony. Intravenous administration of 40 mg/kg APC12 to L. donovani infected BALB/c mice reduced liver and spleen parasite burdens by 60 ± 11% (P < 0.01) and 60 ± 19% (p < 0.05). These studies confirm that it is possible to alter the Milt structure and produce more active anti-leishmanial compounds.
Original languageEnglish
Article number1117
Number of pages16
JournalMicroorganisms
Volume8
Issue number8
Early online date24 Jul 2020
DOIs
Publication statusE-pub ahead of print - 24 Jul 2020

Keywords

  • Leishmania donovani
  • miltefosine
  • SAR

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