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Department of Immunology, University of Washington, Seattle, WA 98185;
Institute for Systems Biology, Seattle, WA 98105;
Department of Biotechnology, University of Washington, Seattle, WA 98195;
Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI 53226;
¶ Department of Obstetrics and Gynaecology, St. Marys Hospital, University of Manchester, Manchester, United Kingdom; and
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Department of Medicine, Monash University, Melbourne, Australia
After i.p. infection of mice with the intracellular bacterium
Mycobacterium bovis bacillus Calmette-Guérin,
macrophages recovered from the peritoneal cavity display classical
signs of immune activation. We have identified a member of the serine
protease inhibitor (serpin) family which is highly induced in
macrophages during bacillus Calmette-Guérin infection. Serpin 2a
(spi2a) expression is also induced in macrophages in vivo during
infection with Salmonella typhimurium and
Listeria monocytogenes, and in vitro by a variety of
bacteria and bacterial products. The cytokine IFN-
also induces
spi2a expression in macrophages, and this induction is synergistic with
bacterial products. We also demonstrate here that a ubiquitin homolog,
IFN-stimulated gene of 15-kDa (ISG15), is strongly induced during in
vitro and in vivo activation of macrophages and that it conjugates to
spi2a in activated macrophages. The ISG15-spi2a conjugates were
identified by tandem mass spectrometry and contained spi2a conjugated
to either one or two molecules of ISG15. Whereas spi2a was induced by
either bacterial products or IFN-
, ISG15 was induced only by
bacterial products. Although many protein targets have been described
for ubiquitin conjugation, spi2a is the first ISG15-modified protein to
be reported. Macrophage activation is accompanied by the activation of
a variety of proteases. It is of interest that a member of the serine
protease inhibitor family is concomitantly induced and modified by a
ubiquitin-like protein.
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