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Title: Cardiotoxicity reduction induced by halofantrine entrapped in nanocapsule devices.
Authors: Leite, Elaine Amaral
Guimarães, Andrea Grabe
Guimarães, Homero Nogueira
Coelho, George Luiz Lins Machado
Barratt, Gillian
Mosqueira, Vanessa Carla Furtado
Keywords: Cardiotoxicity
Lipophilic drug
Drug carriers
Issue Date: 2007
Citation: LEITE, E. A. et al. Cardiotoxicity reduction induced by halofantrine entrapped in nanocapsule devices. Life Sciences, v. 80, n. 14, p. 1327-1334, mar. 2007. Disponível em: <>. Acesso em: 10 jul. 2012.
Abstract: The main objective of the present study was to evaluate the reduction in halofantrine (Hf) toxicity, an antimalarial drug frequently associated with QT interval prolongation in electrocardiogram, by its entrapment in poly-ε-caprolactone nanocapsules (NC). The acute lethal dose (LD100) of Hf.HCl experimentally observed was 200 mg/kg whereas the calculated LD50 was 154 mg/kg. In contrast, the LD100 for Hf-NC was 300 mg/ kg with a longer mean time to death than Hf.HCl. The calculated LD50 was 249 mg/kg for Hf-NC. The Hf entrapped in PCL NC presented a greater efficacy than PLA-PEG NC and than Hf solution in P. berghei-infected mice at 1 mg/kg. The cardiovascular parameters, ECG and arterial blood pressure, were evaluated in anaesthetized Wistar rats after the IV administration of a single, especially high dose (100 and 150 mg/kg) of halofantrine base loaded-nanocapsules (Hf-NC) or halofantrine chlorhydrate (Hf.HCl) solution. It was observed that Hf solution caused prolongation of the QT and PR intervals of the ECG; however, this effect was significantly (Pb0.001) reduced when Hf was administered entrapped in nanocapsules. The treatment with Hf.HCl induced a pronounced bradycardia and severe hypotension leading to death. The effect of Hf-NC upon heart rate was reduced from 58 to 75% for 100 and 150 mg/kg, respectively, when compared with Hf.HCl solution. These findings show that the encapsulation of halofantrine reduces the QT interval prolongation of ECG in rats and suggest that a modification of drug distribution was possible by using nanocapsules. Hf encapsulation was the main factor responsible for the significant reduction in cardiac toxicity observed.
ISSN: 00243205
metadata.dc.rights.license: O periódico Life Sciences concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3285421187900.
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