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. 1982 Dec;38(3):1223–1230. doi: 10.1128/iai.38.3.1223-1230.1982

Host-parasite relationship in murine leishmaniasis: pathophysiological and immunological changes.

N E Reiner
PMCID: PMC347879  PMID: 7152667

Abstract

The host-parasite relationship in human visceral leishmaniasis remains poorly understood. In the present study, pathophysiological and immunological changes were examined in BALB/c mice infected with Leishmania donovani. These animals developed chronic infection with massive hepatosplenomegaly and hypergammaglobulinemia. In contrast to mice inoculated with 0.8 X 10(6) or 4 X 10(6) amastigotes, mice infected with 20 X 10(6) amastigotes failed to reduce liver parasite loads during 2 to 8 weeks of observation. At 8 weeks, liver size was increased by 26, 63, and 94%, respectively, in groups infected with 0.8 X 10(6), 4 X 10(6), or 20 X 10(6) amastigotes. Serum immunoglobulin G and M levels at 8 weeks in animals with the heaviest infection were increased by 53 and 80%, respectively, compared with controls. Specific antileishmanial antibodies were detected in the absence of antigen-specific delayed-type hypersensitivity or in vitro lymphocyte responses. Infection did not suppress the in vivo responses of mice to the non-parasite-related antigens sperm whale myoglobin or pneumococcal polysaccharide. Splenic mononuclear cell responses to phytohemagglutinin were suppressed as early as 2 weeks, and by 8 weeks, mice infected with 0.8 X 10(6), 4 X 10(6), or 20 X 10(6) amastigotes had phytohemagglutinin responses which were, respectively, 27.7, 13.9, and 15.8% of controls. Decreased phytohemagglutinin responses could not be related to reductions in splenic T cells; however, splenic B cells and macrophages were increased at 8 weeks of infection. The course of L. donovani infection and disease in BALB/c mice resembles events occurring in humans and should prove useful in defining mechanisms of immune alterations in visceral leishmaniasis.

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Selected References

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