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Trypanosoma cruzi correlation of resistance and susceptibility in infected inbred mice with the in vivo primary antibody response to sheep red blood cells



Trypanosoma cruzi correlation of resistance and susceptibility in infected inbred mice with the in vivo primary antibody response to sheep red blood cells



Experimental Parasitology 52(2): 233-242



Nonspecific immune responses during the course of murine T. cruzi infection were examined in mouse strains genetically resistant or susceptible to the Brazil strain of T. cruzi. Spleen cells from infected susceptible (C3H) or resistant [C57 BL/10 and F1 (C3H .times. C57)] mice at various points during the course of infection exhibited a reduced response to concanavalin A and lipopolysaccharide in vitro. Since this reduced response occurred in both susceptible and resistant mice, it was not predictive of resistance or susceptibility in vivo. The kinetics of in vivo primary antibody response to sheep red blood cells (SRBC) was examined in infected C3H and C57 mice. C3H mice exhibited inhibition of the direct plaque-forming cell assay (d-PFC) which persisted until death. In contrast, C57 mice exhibited no inhibition of the response at day 5 and subsequently a markedly augmented response was observed. Other strains of mice were similarly investigated: all the susceptible mice examined (A/J, BALB/c) showed inhibition or depression of the primary antibody response, and resistant mice [B10Br, C57Bl/10, SJL, F1 (C3H .times. C57) demonstrated either no inhibition or considerable augmentation of this response. C57 mice resistant to the Brazil strain were susceptible to the Tulahuen strain. The mice in this latter group exhibited a markedly significant inhibition of the in vivo primary antibody response to SRBC. Culture forms of the Brazil strain protected C3H mice from a virulent challenge. Immunization resulted in a markedly augmented antibody response. Data are consistent with the notion that inhibition of the primary antibody response to SRBC correlates with susceptibility whereas no inhibition or, indeed, augmentation of the response correlates with natural as well as acquired resistance.

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Accession: 006844439

Download citation: RISBibTeXText

PMID: 6791952

DOI: 10.1016/0014-4894(81)90078-3


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