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. 1996 Apr;64(4):1154–1160. doi: 10.1128/iai.64.4.1154-1160.1996

Differential production of interleukin-12 mRNA by murine macrophages in response to viable or killed Salmonella spp.

C Chong 1, K L Bost 1, J D Clements 1
PMCID: PMC173897  PMID: 8606072

Abstract

The use of attenuated Salmonella spp. as live oral vaccine carriers fo r foreign antigens has been extensively studied. We have shown that appropriately prepared nonviable organisms are as effective as viable organisms in eliciting humoral immune responses against a foreign antigen delivered by these vectors. It is not clear how strain viability affects the development of a cell-mediated immune response. In the present study, we demonstrate that BALB/c mice orally immunized with viable attenuated Salmonella spp. were protected against subsequent challenge while animals immunized with killed organisms were not. Protection was correlated with increased production of interleukin-12 (IL-12) p40 mRNA in the Peyer's patches within hours of oral administration. Peritoneal macrophages from lipopolysaccharide (LPS)-responsive and LPS-unresponsive mice were also examined for production of IL-12 p40 mRNA following exposure to the viable or killed attenuated Salmonella carrier. There was dramatic upregulation of IL-12 p40 mRNA following exposure of macrophages to either viable or killed organisms. By 4 h postexposure, viable organisms had induced a 27-fold increase in IL-12 p40 mRNA levels while killed organisms had induced a 9-fold increase in IL-12 p40 mRNA levels. This was observed in macrophages isolated from both LPS-responsive and unresponsive mice. The higher levels of IL-12 induced by viable Salmonella spp. may result in the development of a Th1 response and cell mediated immunity, while the lower levels of IL-12 induced by killed Salmonella spp. may not be sufficient to promote a Th1 response.

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Selected References

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