The dynamics of granuloma formation in experimental visceral leishmaniasis

• Published in: The Journal of experimental medicine Vol. 167; no. 6; pp. 1927 - 1937
• Main Authors: MCELRATH, M. J, MURRAY, H. W, COHN, Z. A
• Format: Journal Article
• Language: English
• Published: New York, NY Rockefeller University Press 01-06-1988; The Rockefeller University Press
• Subjects: Animals; Antibodies, Monoclonal - immunology; Antigens, Differentiation, T-Lymphocyte - analysis; Biological and medical sciences; Experimental protozoal diseases and models; Granuloma - parasitology; Granuloma - physiopathology; Immunoenzyme Techniques; Immunologic Memory; Infectious diseases; Kupffer Cells - immunology; Leishmania donovani; Leishmaniasis, Visceral - physiopathology; Liver Diseases - parasitology; Liver Diseases - physiopathology; Medical sciences; Mice; Parasitic diseases; Protozoal diseases; T-Lymphocytes - immunology; Protozoa; Granuloma; Protozoal disease; Immunocytochemistry; Liver; Leishmania donovani; Leishmaniasis; Cell subpopulation; Infection; Kupffer cell; Experimental disease; T-Lymphocyte; Rhizoflagellata; Formation
• ISSN: 0022-1007; 1540-9538
• DOI: 10.1084/jem.167.6.1927

We have examined the temporal sequence of events leading to the formation of hepatic granulomas after the intravenous injection of L. donovani amastigotes into BALB/c mice. Parasite ingestion by permissive Kupffer cells (KC) occurred promptly, and local KC aggregations were the foci about which granulomas were subsequently formed. Infected KC were recognized by the uptake of colloidal carbon and the expression of the macrophage-specific antigen recognized by F4/80 mAb. Peroxidase-positive granulocytes migrated rapidly and were followed by monocytes and L3T4+ T cells that enclosed the infected KC. Thereafter, Ly-2+ T cells were prominent members of the granulomatous lymphoid population. Parasites multiplied until 4 wk, and then a prompt reduction in infected cells occurred. This was associated with a sharp decline in the L3T4+ T cells of the granulomas and the maintenance of the Ly-2+ subset. In comparison, athymic nu/nu mice developed smaller, more slowly appearing granulomas that contained granulocytes and monocytes and exhibited progressive parasite replication. Upon rechallenge, the entire process was completed in 2 wk, and infected KC in the euthymic mice were never observed. We hypothesize that the effectiveness of the granulomatous response requires the destruction of parasitized host cells (KC), in a lymphokine rich environment. We further suggest that the Ly-2+ T cell serves as an important effector cell in this process, either by direct cytotoxicity or by supporting the cytotoxic potential of other cell types in the granuloma.