Acquired resistance to Listeria monocytogenes is mediated by Lyt-2+ T cells independently of the influx of monocytes into granulomatous lesions.
Facultative intracellular bacteria induce specific T cell responses of both the CD4+ and the CD8+ subsets. The immunohistological study of the tissue responses to Listeria monocytogenes in T cell subset-depleted, Listeria-primed mice revealed that CD4+ cells not only represent the predominant lymphocyte population in granulomatous lesions but mediate the attraction and accumulation of blood-borne monocytes into inflammatory foci. On the other hand, CD8+ T cells are able to mediate protection in the absence of CD4+ T cells, invading monocytes, and granulomatous inflammation, and therefore appear to activate resident macrophages for listericidal activity.
Mielke
M E
ME
Department of Medical Microbiology, Klinikum Steglitz, Freie Universität Berlin, Federal Republic of Germany.
Niedobitek
G
G
Stein
H
H
Hahn
H
H
D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D000950:Antigens, Ly / Q000032:analysis; D006099:Granuloma / Q000276:immunology; D008089:Listeria monocytogenes / Q000276:immunology; D008088:Listeriosis / Q000276:immunology*; D008099:Liver / Q000276:immunology; D008262:Macrophage Activation; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000276:immunology*; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly