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Infection and Immunity, March 2000, p. 1600-1607, Vol. 68, No. 3
Max-Planck-Institut für Immunbiologie,
D-79108 Freiburg,1 and Klinik und
Poliklinik für Innere Medizin III, Forschungslabor, D-06097
Halle (Saale),2 Germany
Received 22 July 1999/Returned for modification 20 September
1999/Accepted 22 November 1999
We investigated the reason for the inability of lipopolysaccharide
(LPS)-resistant (Lps-defective
[Lpsd]) C57BL/10ScCr mice to produce beta
interferon (IFN-
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Bacterial Induction of Beta Interferon in Mice Is a
Function of the Lipopolysaccharide Component


) when stimulated with bacteria. For this purpose,
the IFN-
and other macrophage cytokine responses induced by LPS and
several killed gram-negative and gram-positive bacteria in
LPS-sensitive (Lps-normal [Lpsn];
C57BL/10ScSn and BALB/c) and Lpsd (C57BL/10ScCr
and BALB/c/l) mice in vitro and in vivo were investigated on the mRNA
and protein levels. In addition, double-stranded RNA (dsRNA) was used
as a nonbacterial stimulus. LPS and all gram-negative bacteria employed
induced IFN-
in the Lpsn mice but not in the
Lpsd mice. All gram-positive bacteria tested
failed to induce significant amounts of IFN-
in all four of the
mouse strains used. As expected, all other cytokines tested (tumor
necrosis factor alpha, interleukin 1
[IL-1
], IL-6, and IL-10)
were differentially induced by gram-negative and gram-positive
bacteria. Stimulation with dsRNA induced IFN-
and all other
cytokines mentioned above in all mouse strains, regardless of their LPS
sensitivities. The results suggest strongly that LPS is the only
bacterial component capable of inducing IFN-
in significant amounts
that are readily detectable under the conditions used in this study.
Consequently, in mice, IFN-
is inducible only by gram-negative
bacteria, but not in C57BL/10ScCr or other LPS-resistant mice.
*
Corresponding author. Mailing address:
Max-Planck-Institut für Immunbiologie, Stübeweg 51, D-79108 Freiburg, Germany. Phone: 49-761-5108-404. Fax:
49-761-5108-403. E-mail: freudenberg{at}immunbio.mpg.de.
Present address: Max-von-Pettenkofer-Institut für
Mikrobiologie und Hygiene, Abt. Bakteriologie, D-80336 Munich, Germany.
Present address: Novartis Pharma AG, Biotechnology,
S-506.3.14, CH-4002 Basel, Switzerland.
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