Abstract
To elucidate the role of T lymphocytes in primary infection with Yersinia enterocolitica, we investigated the elimination rate of this pathogen, the histomorphology of tissue lesions, and the immune responses of athymic T-cell-deficient C57BL/6 nude mice and their euthymic littermates after parenteral infection with Y. enterocolitica of serotype O:8. While a low inoculum of 3 x 10(2) Y. enterocolitica cells (about 0.01 times the median lethal dose for normal C57BL/6 mice) was cleared by normal C57BL/6 mice within 7 to 10 days, athymic nude C57BL/6 mice developed progressive infections after this inoculum, leading to death on days 20 to 25 postinfection (p.i.). While normal C57BL/6 mice experienced short-term transient infections, nude mice exhibited a biphasic, progressive infectious process. Thus, in the early phase (days 1 to 7 p.i.), a rapid influx of CD11b/18-positive cells (Mac-1 antigen) and natural killer cells was evident in the spleens and livers of the nude mice. The late phase (from day 8 p.i. onward) was characterized by a rapid progression of the infection and a further influx of CD11b/18-positive cells into the liver accompanied by an increase in bacterial counts and development of tissue lesions particularly in the liver and spleen. In normal mice, granuloma-like lesions composed of CD11b/18-, CD4-, and CD8-positive cells could be observed. However, granulomata were not found in nude mice. Yersinia-specific immunoglobulin G antibodies appeared on day 15 p.i. in the sera of normal mice, while nude mice failed to develop significant antibody titers. Adoptive transfer of Yersinia-specific T cells into athymic nude mice mediated resistance to Y. enterocolitica infection and restored both the ability of granuloma formation and the production of specific antibodies. In summary, the data presented herein strongly suggest that T lymphocytes play an essential role in the defense of C57BL/6 mice against Y. enterocolitica.
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