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Infection and Immunity, July 1999, p. 3619-3624, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Salmonella typhi Flagella Are Potent
Inducers of Proinflammatory Cytokine Secretion by Human
Monocytes
Timothy L.
Wyant,
Michael
K.
Tanner, and
Marcelo B.
Sztein*
Center for Vaccine Development, Departments
of Pediatrics and Medicine, University of Maryland, Baltimore,
Maryland 21201
Received 25 January 1999/Returned for modification 19 March
1999/Accepted 21 April 1999
The cytokine production patterns of human peripheral blood
mononuclear cells (PBMC) in response to Salmonella typhi
flagella (STF) were examined in culture supernatants of PBMC stimulated with STF. Consistent with previous findings in volunteers vaccinated with aroC aroD deletion mutants of S. typhi,
PBMC from volunteers immunized with the licensed live Ty21a S. typhi vaccine secreted gamma interferon following exposure to
STF. Stimulation with STF induced rapid de novo synthesis of tumor
necrosis factor alpha (TNF-
) and interleukin-1
(IL-1
),
followed by IL-6 and IL-10. Trypsin treatment of STF abrogated their
effects, while polymyxin B had no effect. Intracellular cytokine
measurements of STF-stimulated PBMC revealed the existence of monocyte
subpopulations that produce only TNF-
, IL-1
or both cytokines.
Moreover, STF markedly decreased the percentage of CD14+
cells. These data demonstrate that STF are powerful monocyte activators
which may have important implications for vaccine development and for
understanding the pathogenesis of S. typhi infection.
*
Corresponding author. Mailing address: Center for
Vaccine Development, Departments of Pediatrics and Medicine, University of Maryland, 685 West Baltimore St., Rm. 480, Baltimore, MD 21201. Phone: (410) 706-2345. Fax: (410) 706-6205. E-mail:
msztein{at}UMPPA1.ab.umd.edu.

Present address: SurroMed,Inc., Palo Alto, CA
94303.
Infection and Immunity, July 1999, p. 3619-3624, Vol. 67, No. 7
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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