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Leishmania (Leishmania) amazonensis infection and dissemination in mice inoculated with stationary-phase or with purified metacyclic promastigotes

Published online by Cambridge University Press:  27 July 2007

T. C. FELIZARDO ,
L. S. TOMA ,
N. B. BORGES ,
G. M. C. A. LIMA  and
I. A. ABRAHAMSOHN
T. C. FELIZARDO*
Affiliation:
Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, 05508-900, São Paulo, SP, Brasil
L. S. TOMA
Affiliation:
Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, 05508-900, São Paulo, SP, Brasil
N. B. BORGES
Affiliation:
Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, 05508-900, São Paulo, SP, Brasil
G. M. C. A. LIMA
Affiliation:
Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, 05508-900, São Paulo, SP, Brasil
I. A. ABRAHAMSOHN
Affiliation:
Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes 1730, 05508-900, São Paulo, SP, Brasil
*
*Corresponding author. Tel:/Fax: +55 11 3091 7383. E-mail: tcfeliz@usp.br.
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Summary

Leishmania (Leishmania) amazonensis is a protozoan of the American Continent that causes localized cutaneous leishmaniasis and, rarely, the diffuse cutaneous form of disease in humans. It has become clear in recent years that the course of Leishmania major infection in the mouse model differs when low numbers of purified metacyclic forms are used as inocula in comparison with the traditionally hitherto studied infection models that used large numbers of stationary-phase (SP) promastigotes. The low-number metacyclic inocula are thought to reproduce more closely the natural infection transmitted by the vector. In the present study the course of L. amazonensis infection, its local and distant dissemination patterns, and parasite load were compared in susceptible BALB/c and relatively resistant C57BL/6 mice infected in the footpad with inocula of 107 SP-promastigotes or with 104 purified metacyclic forms. Longer lag-phases were observed for infection with purified metacyclics but the characteristic patterns of disease susceptibility and cytokine production for either mouse strain were similar to those observed for SP-promastigote inocula. An inoculation dose of the order of 104 metacyclics was required to obtain consistent infections; 10- or 100-fold lower doses resulted in variable infection rates. Characteristically, L. amazonensis infection spread to distant organs and persisted there also in the relatively resistant C57BL/6 mice examined after 6 months of infection.

Keywords

Leishmania amazonensisdisseminationparasitismmetacyclic promastigotesstationary-phase promastigotessusceptible miceresistant mice
Type
Research Article
Information
Parasitology , Volume 134 , Issue 12 , November 2007 , pp. 1699 - 1707
Copyright
Copyright © Cambridge University Press 2007

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