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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,dagger 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-alpha ) and interleukin-1beta (IL-1beta ), 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-alpha , IL-1beta 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.

dagger 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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Copyright © 1999 by the American Society for Microbiology. All rights reserved.