Author:

Phadke AP, Mehrad B

Date: 7 September 2006

Abstract:

Many aspects of antimicrobial host responses are orchestrated by a complex network of cytokines and their receptors. This review focuses on recent progress in our understanding of the function of cytokines in innate immune responses to Aspergillus. TNF, a recognition cytokine, has been shown to be required for initiation of the innate response in the mouse model of invasive aspergillosis. Several recruitment cytokines play critical roles in mediating influx of specific leukocytes to the site of infection in invasive aspergillosis. Among these, the ELR + subset of CXC chemokines and their receptor CXCR2 are critical to neutrophil recruitment, while CCL3/macrophage inflammatory protein (MIP)-1alpha and CCL2/ monocyte chemoattractant protein (MCP)-1 are critical to recruitment of monocyte-lineage leukocytes and NK cells, respectively. Of the activation cytokines, those associated with the Th-1 phenotype, including interleukin (IL)-12, IL-18, and interferon-gamma (IFN-gamma), are critical to protective responses to the infection. Conversely, the Th2-phenotype cytokines IL-4 and IL-10 contribute to progression of infection. Modulation of the immune response to Aspergillus by manipulating these mediators remains intriguing as a potential adjunctive treatment in patients with invasive aspergillosis

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