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J. Exp. Med.,
Volume 188, Number 5, September 7, 1998 809-818
By

From the * Laboratory of Intracellular Parasites, Chlamydia trachomatis, an obligate intracellular bacterial pathogen of mucosal surfaces, is a major
cause of preventable blindness and sexually transmitted diseases for which vaccines are badly needed. Despite considerable effort, antichlamydial vaccines have proven to be elusive using
conventional immunization strategies. We report the use of murine bone marrow-derived
dendritic cells (DC) pulsed ex vivo with killed chlamydiae as a novel approach to vaccination
against chlamydial infection. Our results show that DC efficiently phagocytose chlamydiae, secrete IL-12 p40, and present chlamydial antigen(s) to infection sensitized CD4+ T cells. Mice
immunized intravenously with chlamydial-pulsed DC produce protective immunity against
chlamydial infection of the female genital tract equal to that obtained after infection with live
organisms. Immunized mice shed ~3 logs fewer infectious chlamydiae and are protected from
genital tract inflammatory and obstructive disease. Protective immunity is correlated with a chlamydial-specific Th1-biased response that closely mimics the immune response produced
after chlamydial infection. Thus, ex vivo antigen-pulsed DC represent a powerful tool for the
study of protective immunity to chlamydial mucosal infection and for the identification of
chlamydial protective antigens through reconstitution experiments. Moreover, these findings
might impact the design of vaccine strategies against other medically important sexually transmitted diseases for which vaccines are sought but which have proven difficult to develop.
Microscopy Branch, and § Laboratory of Persistent Viral
Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Rocky
Mountain Laboratory, Hamilton, Montana 59840
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