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Infection and Immunity, February 2000, p. 752-759, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Activation of Human Peripheral Blood Mononuclear
Cells by Nonpathogenic Bacteria In Vitro: Evidence of NK Cells as
Primary Targets
D.
Haller,1,2,*
S.
Blum,3
C.
Bode,1
W. P.
Hammes,2 and
E.
J.
Schiffrin3
Institute of Biological Chemistry and
Nutrition Science1 and Institute of Food
Technology,2 University Hohenheim, D-70599
Stuttgart, Germany, and Department of Immunology, Nestlé
Research Centre, 1000 Lausanne 26, Switzerland3
Received 23 August 1999/Returned for modification 7 October
1999/Accepted 4 November 1999
The interaction of commensal bacteria with immunocompetent cells
may occur in definite compartments of the mucosal immune system, as
limited translocation through the epithelial barrier cannot be
excluded. In this study the stimulation of human peripheral blood
mononuclear cells and purified lymphocyte subsets by nonpathogenic gram-positive lactobacilli (Lactobacillus johnsonii and
Lactobacillus sakei) and gram-negative Escherichia
coli was investigated. The various bacterial strains induced a
differential cytokine pattern. Whereas L. johnsonii and
L. sakei strongly induced gamma interferon (IFN-
) and
interleukin-12 (IL-12), E. coli and lipopolysaccharide (LPS) preferentially induced IL-10 after 16 h of stimulation. Expression of activation antigens CD69 and CD25 was observed on (CD3
CD56+) natural killer (NK) cells after
stimulation of total human peripheral blood mononuclear cells. All
bacteria mediated the proliferation of human peripheral blood
mononuclear cells, and the strongest proliferative response was
observed with L. johnsonii. Purified CD4+,
CD8+, and CD19+ lymphocyte subsets were not
activated upon bacterial stimulation but showed normal response to a
mitogenic stimulus. In contrast, purified NK cells upregulated the
IL-2R
chain (CD25) and underwent proliferation when stimulated by
L. johnsonii. E. coli and LPS were less effective in
inducing proliferation. Expression of CD25 or secretion of IFN-
from
purified NK cells was significantly increased in the presence of
bacterially primed macrophages, indicating that full activation
required both bacterium- and cell contact-based signals derived from
accessory cells.
*
Corresponding author. Mailing address: Dept. of
Immunology, Nestlé Research Centre, Vers-Chez-les-Blanc, 1000 Lausanne 26, Switzerland. Phone: 41-21-785-8513. Fax: 41-21-785-8925. E-mail: dirk.haller{at}rdls.nestle.com.
Infection and Immunity, February 2000, p. 752-759, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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