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The Journal of Immunology, Vol 156, Issue 12 4757-4763, Copyright © 1996 by American Association of Immunologists

ARTICLES

Resistance to murine AIDS in offspring of mice infected with LP-BM5. Role of CD8 T cells

JH Pavlovitch, E Hulier, M Rizk-Rabin, M Marussig, D Mazier, ML Joffret, S Hoos and M Papiernik
CNRS URA 583, Necker Hospital, Paris, France.

The murine-acquired immunodeficiency syndrome (MAIDS) is caused by a mixture of murine leukemia viruses (LP-BM5 MuLV). The influence of perinatal contact with retroviruses or their Ags on the response to infection was tested by infecting with LP-BM5 (MuLV) the adult offspring of mice with MAIDS. These offspring were resistant to disease after virus challenge. Most of them were free of defective viral DNA, and even those with molecular evidence of infection had lymphoid cells with a lower infectious capacity to cause MAIDS in naive recipients. No ecotropic, xenotropic, or mink cell focus-forming (MCF) virus expression was found at the age of 5 wk, which is the time of LP-BM5 (MuLV) challenge. However, at 22 wk of age, one-half of the offspring from MAIDS mothers had ecotropic virus-expressing cells in their spleens. At the time of suckling, offspring from infected mothers had enhanced percentages of B cells and CD4 and CD8 T cells in the spleen, possibly followed by a slight persistent splenomegaly. These results suggest that immune reactivity, rather than tolerance to the virus, is responsible for resistance to disease after challenge. The offspring of MAIDS mice could clear the virus after challenge. This clearance was mediated by CD8 T cells, as continuous CD8 T cell depletion initiated at the time of viral challenge abrogated the resistance of these mice to MAIDS.


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