Activation of naive NK cells in response to Listeria monocytogenes requires IL-18 and contact with infected dendritic cells.

Contact with Infected Dendritic Cells Requires IL-18 and Listeria monocytogenes Activation of Naive NK Cells in Response to

Listeria Monocytogenes Activated Dendritic Cell Based Vaccine for Prevention of Experimental Tumor in Mice

Background: The use of dendritic cells (DCs) as a cellular adjuvant provides a promis-ing approach in immunotherapy of cancer. It has been demonstrated that Listeria mono-cytogenes activated DCs pulsed ex vivo with tumor antigens trigger a systemic Th1-biased specific immune response and a single dose of this vaccine will cause a consider-able anti tumor immunity. Objective: The present study w...

NK dendritic cells are innate immune responders to Listeria monocytogenes infection.

NK dendritic cells (NKDC) are recently described immunologic cells that possess both lytic and Ag-presenting function and produce prolific quantities of IFN-gamma. The role of NKDC in innate immunity to bacterial infection is unknown. Because IFN-gamma is important in the immune response to Listeria monocytogenes (LM), we hypothesized that NKDC play a critical role during LM infection in mice. ...

XCR1+ dendritic cells promote memory CD8+ T cell recall upon secondary infections with Listeria monocytogenes or certain viruses

Naive CD8(+) T cell priming during tumor development or many primary infections requires cross-presentation by XCR1(+) dendritic cells (DCs). Memory CD8(+) T lymphocytes (mCTLs) harbor a lower activation threshold as compared with naive cells. However, whether their recall responses depend on XCR1(+) DCs is unknown. By using a new mouse model allowing fluorescent tracking and conditional deplet...

Fas-mediated inflammatory response in Listeria monocytogenes infection.

The molecular mechanisms of Fas (CD95/Apo-1)-mediated apoptosis are increasingly understood. However, the role of Fas-mediated production of proinflammatory cytokines such as IL-18 and IL-1β in bacterial infection is unclear. We demonstrate the importance of Fas-mediated signaling in IL-18/IL-1β production postinfection with Listeria monocytogenes without the contribution of caspase-1 inflammas...