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Parasiticidal effects of peroxynitrite on ovine liver flukes in vitro

Published online by Cambridge University Press:  12 April 2024

G. Sadeghi-Hashjin  and
S. Naem
G. Sadeghi-Hashjin*
Affiliation:
Department of Basic Sciences
S. Naem
Affiliation:
Department of Pathobiology, Faculty of Veterinary Medicine, Urmia University, PO Box 641, Urmia, Iran
*
*Fax: +98-441-443442, E-mail: G.Sadeghi@VBS.Urmia.ac.ir
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Abstract

Peroxynitrite (ONOO-) is a cytotoxic anion, produced by interaction between nitric oxide and superoxide in vivo in some inflammatory cells. This study investigated its effects on Fasciola hepatica and Dicrocoelium dendriticum isolated from ovine livers and kept in bile at room temperature. Peroxynitrite was synthesized using a quenched flow reactor and assayed spectrophotometrically. It was applied at different concentrations (10-3.5 to 10-2.3 M) to the flukes kept in bile. The viability of the peroxynitrite-treated flukes was compared with a control group (n=5–7 per group). Control F. hepatica and D. dendriticum lived for 226±11 and 208±14 min, respectively. Life times were decreased by peroxynitrite at all concentrations used (P<0.001). At the highest concentration of peroxynitrite, F. hepatica and D. dendriticum lived only for 6.1±0.4 and 4.1±4.1±0.2 min, respectively. Correlation between peroxynitrite concentration and parasite viability was significant in the case of F. hepatica (r=-0.842; P=0.0035). A single application of peroxynitrite can decrease the life span of ovine liver flukes. A failure in the activation of hepatic macrophages in infected animals may lead to a decreased production of free radicals and, thus, peroxynitrite. Such a failure is likely to deprive the body of a defence tool against multicellular parasites.

Type
Research Article
Information
Journal of Helminthology , Volume 75 , Issue 1 , January 2001 , pp. 73 - 76
Copyright
Copyright © Cambridge University Press 2001

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