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. 1980 Jun;28(3):660–668. doi: 10.1128/iai.28.3.660-668.1980

Influence of Route of Mycobacterium lepraemurium Injection on Susceptibility to Mouse Leprosy and on Lymphoblastic Transformation

Raymond Turcotte 1
PMCID: PMC551001  PMID: 6995320

Abstract

Groups of female C57BL/6 and C3H/St mice were inoculated intraperitoneally (i.p.) with 109, 107, and 105 bacilli and into the right hind footpad with 107 and 105 bacilli of Mycobacterium lepraemurium. The incidence of death from leprosy and the mean survival time of leprous mice were recorded. In addition, the blastogenic responses to the T-cell mitogens phytohemagglutinin and concanavalin A and to the B-cell mitogens lipopolysaccharide and dextran sulfate were evaluated at various times during the course of infection in the spleen and peripheral lymph nodes of mice infected with 107 bacilli. When M. lepraemurium was administered i.p., the two strains of mice succumbed to the disease at about the same time, except for the C57BL/6 mice infected with 109 bacilli, which died earlier than the C3H/St mice. Moreover, in both strains of mice, a progressive depression of blastogenesis, first to the T-cell mitogens and then to the B-cell mitogens in the spleen, and to the T-cell mitogens in the peripheral lymph nodes, occurred during the course of the infection, whereas the response to the B-cell mitogens in the nodes increased slowly during the advanced stage of the disease. When 107 and 105 bacilli were injected into the footpad, the C3H/St mice succumbed to the disease at 298 and 344 days, respectively, and the modifications of blastogenesis were similar to those observed in i.p.-infected C3H/St mice. In contrast, the C57BL/6 mice appeared resistant to footpad inoculation of M. lepraemurium, since they lived until the end of the observation period (466 days postinfection) and the depression of blastogenesis was not detectable until 1 year after the infection. Thus, it is concluded that for the C57BL/6 mice (but not for the C3H/St mice), the route of administration of M. lepraemurium can markedly influence the susceptibility or resistance to leprosy.

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Selected References

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