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Infection and Immunity, March 2002, p. 1097-1105, Vol. 70, No. 3
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.3.1097-1105.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Dendritic Cells Pulsed with a Recombinant Chlamydial Major Outer Membrane Protein Antigen Elicit a CD4+ Type 2 Rather than Type 1 Immune Response That Is Not Protective

Jennifer Shaw,1 Vernon Grund,2 Luke Durling,1 Debbie Crane,1 and Harlan D. Caldwell1*

Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840,1 Department of Pharmaceutical Sciences, University of Montana, Missoula, Montana 598012

Received 10 August 2001/ Returned for modification 27 September 2001/ Accepted 26 November 2001

Chlamydia trachomatis is an obligate intracellular bacterium that infects the oculogenital mucosae. C. trachomatis infection of the eye causes trachoma, the leading cause of preventable blindness. Infections of the genital mucosae are a leading cause of sexually transmitted diseases. A vaccine to prevent chlamydial infection is needed but has proven difficult to produce by using conventional vaccination approaches. Potent immunity to vaginal rechallenge in a murine model of chlamydial genital infection has been achieved only by infection or by immunization with dendritic cells (DC) pulsed ex vivo with whole inactivated organisms. Immunity generated by infection or ex vivo antigen-pulsed DC correlates with a chlamydia-specific interleukin 12 (IL-12)-dependent CD4+ Th1 immune response. Because of the potent antichlamydial immunizing properties of DC, we hypothesized that DC could be a powerful vehicle for the delivery of individual chlamydial antigens that are thought to be targets for more conventional vaccine approaches. Here, we investigated the recombinant chlamydial major outer membrane protein (rMOMP) as a target antigen. The results demonstrate that DC pulsed with rMOMP secrete IL-12 and stimulate infection-sensitized CD4+ T cells to proliferate and secrete gamma interferon. These immunological properties implied that rMOMP-pulsed DC would be potent inducers of MOMP-specific CD4+ Th1 immunity in vivo; however, we observed the opposite result. DC pulsed ex vivo with rMOMP and adoptively transferred to naive mice generated a Th2 rather than a Th1 anti-MOMP immune response, and immunized mice were not protected following infectious challenge. We conclude from these studies that the immunological properties of ex vivo pulsed DC are not necessarily predictive of the immune response generated in vivo following adoptive transfer. These findings suggest that the nature of the antigen used to pulse DC ex vivo influences the Th1-Th2 balance of the immune response in vivo.

* Corresponding author. Mailing address: Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIAID, NIH, 903 South 3rd St., Hamilton, MT 59840. Phone: (406) 363-9333. Fax: (406) 363-9355. E-mail: hcaldwell{at}niaid.nih.gov.

Infection and Immunity, March 2002, p. 1097-1105, Vol. 70, No. 3
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.3.1097-1105.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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