Original Article

Trypanocidal action of 2,4-dichloro-6-phenylphenoxyethyl diethylamine hydrobromide (Lilly 18947) on Trypanosoma cruzi.

Authors: Adriana Silvina BERNACCHI, Berta Franke de CAZZULO, Jose Alberto CASTRO, Juan Jose CAZZULO


AIM: To study the effect of the inhibitor of cytochrome P450 known as Lilly 18947
(2,4 dichloro-6 phenylphenoxy ethyl diethylamine) on Trypanosoma cruzi.
METHODS: Trypanosoma cruzi epimastigotes were grown in culture, in absence or in
presence of drug. The inhibition of its growth was followed by daily counting
using a Neubauer chamber. The effect of Lilly 18947 on the parasite
ultrastructure was examined by electron microscopy. To test the effect of
different concentrations of drug on the parasite cycle, Vero cells were
inoculated with trypomastigotes (RA strain) and after 72 h the percentage of
infected cells and the number of intracellular parasites were estimated and
expressed as the endocytic index.
RESULTS: Growth of epimastigotes was inhibited by Lilly 18947. Concentrations as
low a s 50 micromol/L resulted in a complete disappearance of the parasites in
culture by the fourth day. With lower concentrations, little growth was observed
and total (25 micro mol/L) or partial lysis (10 micromol/L) were registered by
the eighth day of culture. Incubation of epimastigotes with 50 micromol/L of
Lilly 18947 resulted in an early damage to cellular structures. Initial signs
were dilatation of perinuclear membranes and mitochondria swelling. The
infectivity of trypomastigotes to Vero cells in culture was nearly abolished at
15 and 30 micromol/L concentrations of the drug.
CONCLUSION: Lilly 18947 was able to harm Trypanosoma cruzi membrane functions
leading to the loss of its infective properties and its death.

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