Chapter 15 : Antigen-Presenting Cell Receptors and Innate Immunity: Diversity, Recognition, and Responses

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This chapter discusses selected scavenger and lectinlike antigen-presenting cell (APC) receptors in relation to innate immunity to illustrate principles and provide questions for further study. Genes for the pattern recognition receptors (PRRs) of the innate immune system have become fixed in the germ line during evolution, unlike the recombinant genes generated in somatic cells, which determine clonotypic recognition by T and B lymphocytes in the acquired immune response. The SR-A molecule has two functional (I and II) and one nonfunctional (III) isoforms, depending on differential exon splicing. It is a distinct gene product from macrophage collagenous receptor (MARCO), a similar collagenlike type 2 transmembrane glycoprotein. SR-A function in innate immunity has not been fully analyzed in vivo, but in vitro model systems have contributed to our understanding of its role in uptake of bacteria. It is now clear that there are several distinct mannose recognition molecules expressed by mature macrophages and selected endothelia, including the classic multilectin mannose receptor (MR), DC-SIGN and DC-SIGN-related molecules, and Langerin. The chapter summarizes studies on the MR, for which a range of exogenous and endogenous ligands has been defined. Our knowledge of innate immune recognition by APC receptors and of the pathways leading to distinct responses is limited. This subject has become topical and will have considerable theoretical and practical implications in therapeutic modulation of host resistance to infection and vaccine development. In addition, improved understanding will bring insights into the pathogenesis of autoimmunity and of a range of inflammatory disease syndromes.

Citation: Gordon S. 2004. Antigen-Presenting Cell Receptors and Innate Immunity: Diversity, Recognition, and Responses, p 287-299. In Kaufmann S, Medzhitov R, Gordon S (ed), The Innate Immune Response to Infection. ASM Press, Washington, DC. doi: 10.1128/9781555817671.ch15
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Image of FIGURE 1

Heterogeneity of MΦs, including activation.

Citation: Gordon S. 2004. Antigen-Presenting Cell Receptors and Innate Immunity: Diversity, Recognition, and Responses, p 287-299. In Kaufmann S, Medzhitov R, Gordon S (ed), The Innate Immune Response to Infection. ASM Press, Washington, DC. doi: 10.1128/9781555817671.ch15
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Image of FIGURE 2

SRs. LOX-1, lectin-like oxidized LDL receptor; SREC, scavenger receptor, endothelial cells.

Citation: Gordon S. 2004. Antigen-Presenting Cell Receptors and Innate Immunity: Diversity, Recognition, and Responses, p 287-299. In Kaufmann S, Medzhitov R, Gordon S (ed), The Innate Immune Response to Infection. ASM Press, Washington, DC. doi: 10.1128/9781555817671.ch15
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Image of FIGURE 3

Lectin and lectinlike receptors.

Citation: Gordon S. 2004. Antigen-Presenting Cell Receptors and Innate Immunity: Diversity, Recognition, and Responses, p 287-299. In Kaufmann S, Medzhitov R, Gordon S (ed), The Innate Immune Response to Infection. ASM Press, Washington, DC. doi: 10.1128/9781555817671.ch15
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