Abstract
A sensitive and highly reproducible assay was utilized to study in vitro interactions of Listeria monocytogenes with resident and activated macrophages. The technique is not compromised by extracellular events and can readily differentiate between the efficiency of ingestion and the postphagocytic fate of bacteria. Heat-labile factors in human or homologous serum markedly enhanced the phagocytosis of Listeria without noticeably affecting the intracellular fate of the microorganisms. The behavior of Listeria within macrophages cultivated from C57BL/6 and BALB/c mouse strains corresponded to previous reports of in vivo growth patterns in inbred mice. Thioglycolate- or caseinate-elicited macrophages, although highly phagocytic, were unable to prevent the proliferation of Listeria. A bactericidal macrophage population was derived from from C57BL/6 mice which had been immunized intraperitoneally with a sublethal dose of L. monocytogenes and subsequently boosted with heat-killed homologous organisms. Elicitation of immune animals produced an increase in the percentage of peroxidase-positive macrophages, but this activity could not be correlated with restriction of intracellular bacterial growth.
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