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The Journal of Immunology, 2005, 174: 2457-2465.
Copyright © 2005 by The American Association of Immunologists

BRIEF REVIEWS

Variegation of the Immune Response with Dendritic Cells and Pathogen Recognition Receptors1

Bali Pulendran2

Emory Vaccine Center and Department of Pathology, Emory University, Atlanta, GA 30329

One of the most fundamental questions in biology is: "How do cells differentiate in the right place, at the right time, into the right kinds?" Understanding the phenomenon of cell differentiation in its spatial and temporal framework is a prelude to understanding the development and physiology of all multicellular systems, including the immune system. Insights over the past 2300 years, since Aristotle, suggest that biological differentiation is guided by the interplay between genetic programs and specific environmental signals. This is exemplified by the mammalian immune response to pathogens, where qualitatively different types can emerge. Although it is appreciated that this type immunity is critical for optimal defense against different pathogens, the early "decision-making mechanisms" are largely obscure. Recent developments in innate immunity and genomics, especially in the biology of dendritic cells (DCs) and pathogen recognition receptors, have stimulated intense research in understanding the mechanisms guiding the differentiation of Th1, Th2, and T regulatory responses. In this study, I summarize recent findings which suggest that activation of DCs via distinct pathogen recognition receptors stimulate different gene expression programs and signaling networks in DCs that guide the variegation of immune responses.




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