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Antimicrobial Agents and Chemotherapy, October 1998, p. 2722-2725, Vol. 42, No. 10
Departments of Pharmaceutical
Sciences1 and
Immunology,2 University of
Strathclyde, Glasgow, United Kingdom
Received 27 May 1998/Returned for modification 12 June
1998/Accepted 7 August 1998
In this study, treatment efficacies of a nonionic surfactant
vesicle formulation of sodium stibogluconate (SSG-NIV) and of several
formulations of amphotericin B were compared in a murine model of
visceral leishmaniasis. Treatment with multiple doses of AmBisome,
Abelcet, and Amphocil (total dose, 12.5 mg of amphotericin B/kg of body
weight) resulted in a significant suppression of parasite burdens in
liver (P < 0.0005) and spleen (P < 0.0005) compared with those of controls, with Abelcet having the lowest activity. Only AmBisome and Amphocil gave significant suppression of
parasites in bone marrow (compared to control values,
P < 0.005). In the acute-infection model, single-dose
treatments of SSG-NIV (296 mg of SbV/kg), SSG solution (296 mg of SbV/kg), or AmBisome (8 mg of amphotericin B/kg) were
equally effective against liver parasites (compared to control values,
P < 0.0005). SSG-NIV and AmBisome treatment also
significantly suppressed parasites in bone marrow and spleen
(P < 0.005), with SSG-NIV treatment being more
suppressive (>98% suppression in all three sites). Free-SSG treatment
failed to suppress spleen or bone marrow parasites. Infection status
influenced treatment outcome. In the chronic-infection model, the
AmBisome single-dose treatment was less effective in all three
infection sites and the SSG-NIV single-dose treatment was less
effective in the spleen. The results of this study suggest that the
antileishmanial efficacy of SSG-NIV compares favorably with those of
the novel amphotericin B formulations.
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Visceral Leishmaniasis in the BALB/c Mouse: A Comparison of the
Efficacy of a Nonionic Surfactant Formulation of Sodium Stibogluconate
with Those of Three Proprietary Formulations of Amphotericin
B
*
Corresponding author. Mailing address: Department of
Immunology, The Todd Centre, 31 Taylor St., Glasgow G4 0NR, United
Kingdom. Phone: 0141-552-4400, ext. 3823. Fax: 0141-552-6674. E-mail: k.carter{at}strath.ac.uk.
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