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. 1993 Feb;61(2):714–718. doi: 10.1128/iai.61.2.714-718.1993

Transfer of protective immunity in murine histoplasmosis by a CD4+ T-cell clone.

R Allendoerfer 1, D M Magee 1, G S Deepe Jr 1, J R Graybill 1
PMCID: PMC302784  PMID: 8093695

Abstract

We have reported that a murine Histoplasma capsulatum-reactive CD4+ T-cell line and clones thereof did not adoptively transfer protection against H. capsulatum infection in normal or cyclophosphamide-treated C57BL/6 mice. One explanation for the results was that the T cells failed to traffic to lymphoid organs in these animals. In this study, we have sought to determine whether one of these clones, 2.3H3, could mediate protection in nude (C57BL/10) or irradiated (5 Gy) heterozygous nude (nu/+) C57BL/6 mice. Mice were inoculated intravenously with 10(7) resting 2.3H3 cells or with an equal number of cells of the ovalbumin-reactive clone 1S6; 2 h later, the mice were challenged intranasally with 5 x 10(6) yeast cells. By day 5 of infection, lungs, livers, and spleens of nude and irradiated nu/+ mice given 2.3H3 contained significantly fewer (P < 0.05) CFU than the same organs from mice inoculated with 1S6. This effect was specific for H. capsulatum, since 2.3H3 did not reduce the number of Coccidioides immitis CFU in lungs, livers, and spleens of irradiated nu/+ mice. By day 10, the amounts of H. capsulatum CFU in lungs, livers, or spleens of nude and irradiated nu/+ mice inoculated with 2.3H3 were smaller than those in 1S6-inoculated mice, but these differences did not reach statistical significance (P > 0.05). The mortality rate of mice inoculated with 2.3H3 and that of mice inoculated with 1S6 were similar. Histopathological examination of tissues from 2.3H3- and 1S6-inoculated mice demonstrated the presence of granulomatous inflammation in organs from both groups. Tissues from 2.3H3-treated mice contained fewer yeasts per high-power field than tissues from 1S6-treated mice. Thus, irradiated or nude mice are permissive for the expression of protective immunity by a CD4+ T-cell clone. Although the protective capacity of T cells in these animals is transient, these animals will be useful for differentiating protective from nonprotective T-cell clones.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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