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The Journal of Immunology, 2000, 165: 969-977.
Copyright © 2000 by The American Association of Immunologists

A Natural Model of Leishmania major Infection Reveals a Prolonged "Silent" Phase of Parasite Amplification in the Skin Before the Onset of Lesion Formation and Immunity

Yasmine Belkaid*, Susana Mendez*, Rosalia Lira*, Navin Kadambi*, Genevieve Milon{dagger} and David Sacks1,*

* Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892; and {dagger} Unité d’Immunophysiologie Cellulaire, Institut Pasteur, Paris, France

A model of Leishmania major infection in C57BL/6 mice has been established that combines two main features of natural transmission: low dose (100 metacyclic promastigotes) and inoculation into a dermal site (the ear dermis). The evolution of the dermal lesion could be dissociated into two distinct phases. The initial "silent" phase, lasting 4–5 wk, favored establishment of the peak load of parasites in the dermis in the absence of lesion formation or any overt histopathologic changes in the site. The second phase corresponds to the development of a lesion associated with an acute infiltration of neutrophils, macrophages, and eosinophils into the dermis and was coincident with the killing of parasites in the site. The onset of immunity/pathology was correlated with the appearance of cells staining for IL-12p40 and IFN-{gamma} in the epidermal compartment, and an expansion of T cells capable of producing IFN-{gamma} in the draining lymph node. Parasite growth was not enhanced over the first 4.5 wk in anti-CD4-treated mice, SCID mice, or C57BL/6 mice deficient in IL-12p40, IFN-{gamma}, CD40 ligand, or inducible NO synthase. These mice all failed to ultimately control infection in the site, but in some cases (anti-CD4 treated, IL-12p40-/-, CD40 ligand-/-, and SCID) high dermal parasite loads were associated with little or no pathology. These results extend to a natural infection model a role for Th1 cells in both acquired resistance and lesion formation, and document the remarkable avoidance of this response during a prolonged phase of parasite amplification in the skin.




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