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Immunologic Events during Listeria Monocytogenes Infection in Mice: Adjuvanticity and Immunogenicity of Macrophage-Bound Antigens¹

Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115

Abstract

There was a marked enhancement of the immune response to keyhole limpet hemocyanin administered at the time of inoculation with Listeria monocytogenes. Such enhancement was best seen if the antigen was given close to the time of inoculation with Listeria monocytogenes. Such enhancement was best seen if the antigen was given close to the time of inoculation with the bacteria. Bacterial filtrates also produced an adjuvant effect.

Peritoneal exudate cells harvested a few days after Listeria infection contained large activated macrophages. Such macrophages had a greater uptake of ¹²⁵I-labeled hemocyanin. Metabolic studies indicated that the percentage of hemocyanin retained on the membrane or released from macrophages was increased in activated cells. Hemocyanin bound to activated macrophages was slightly more immunogenic. Activated macrophages (without antigen) did not transfer adjuvant effects. We conclude that the adjuvant effect was not associated with the presence of activated macrophages.

Footnotes

¹ This work was supported by Research Grant AI-10091 from the National Institutes of Health.

² Supported by a Research Training Grant of the National Institutes of Health to the Department of Surgery of Harvard Medical School at the Peter Bent Brigham Hospital.

³ Recipient of a Research Career Development Award of the National Institutes of Health.