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Infect. Immun., 04 1996, 1357-1368, Vol 64, No. 4
IB Autenrieth, V Kempf, T Sprinz, S Preger and A Schnell
Adhesion molecules and cytokines are involved in regulation of cellular
host responses in infection processes. In this study the roles of the
integrins Mac-1 and VLA-4, as well as those of the cytokines tumor necrosis
factor alpha (TNF-alpha) and gamma interferon (IFN-gamma), in defense
mechanisms against Yersinia enterocolitica in Peyer's patches (PP) and
mesenteric lymph nodes (MLN) were investigated by blocking these molecules
with antibodies in vivo prior to orogastric Yersinia infection. Intestinal
Yersinia infection caused abscesses composed of polymorphonuclear (Mac-1+
VLA-4+ Pgp-1+ ICAM-1-) and mononuclear (Mac- 1+ VLA-4+ Pgp-1+
ICAM-inhibited phagocytosis of yersiniae by macrophages, (ii) reduced
Yersinia-specific proliferation and IFN-gamma production of T cells from PP
and MLN, and (iii) caused increased bacterial growth in PP and MLN followed
by profound tissue destruction. Neutralization of TNF-alpha or IFN-gamma
had comparable effects, suggesting that cell-mediated host responses
including activated macrophages are required for control of yersiniae in
intestinal tissues. The number of Mac-1+ cells in PP and MLN increased
after yersinia infection, and recruitment of these cells was not blocked by
administration of anticytokine or anti-integrin antibodies. While anti-
VLA-4, -TNF-alpha, or -IFN-gamma antibody treatment caused an increased
dissemination of yersiniae from PP to the spleen systemic dissemination was
reduced by anti-Mac-1 antibodies. The results of this study suggest that
the cytokines IFN-gamma and TNF-alpha as well as the integrins Mac- 1 and
VLA-4 are involved in protective cellular host defense mechanisms in PP and
MLN against Y. enterocolitica, the latter probably being involved in both
cell-cell and cell-pathogen interactions.
Copyright © 1996, American Society for Microbiology
Defense mechanisms in Peyer's patches and mesenteric lymph nodes against Yersinia enterocolitica involve integrins and cytokines
Institut fur Hygiene and Mikrobiologie der Universitat Wurzburg, Germany.
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