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The Dendritic Cell System and its Role in Immunogenicity

Steinman, Ralph M.·1991·Annual Review of Immunology

Abstract

Dendritic cells are a system of antigen presenting cells that function to initiate several immune responses such as the sensitization of MHC-restricted T cells, the rejection of organ transplants, and the formation of T-dependent antibodies. Dendritic cells are found in many nonlymphoid tissues but can migrate via the afferent lymph or the blood stream to the T-dependent areas of lymphoid organs. In skin, the immunostimulatory function of dendritic cells is enhanced by cytokines, especially GM-CSF. After foreign proteins are administered in situ, dendritic cells are a principal reservoir of immunogen. In vitro studies indicate that dendritic cells only process proteins for a short period of time, when the rate of synthesis of MHC products and content of acidic endocytic vesicles are high. Antigen processing is selectively dampened after a day in culture, but the capacity to stimulate responses to surface bound peptides and mitogens remains strong. Dendritic cells are motile, and efficiently cluster and activate T cells that are specific for stimuli on the cell surface. High levels of MHC class-I and -II products and several adhesins, such as ICAM-1 and LFA-3, likely contribute to these functions. Therefore dendritic cells are specialized to mediate several physiologic components of immunogenicity such as the acquisition of antigens in tissues, the migration to lymphoid organs, and the identification and activation of antigen-specific T cells. The function of these presenting cells in immunologic tolerance is just beginning to be studied.

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Crossref · 10.1146/annurev.iy.09.040191.001415

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Metadata

Authors
Steinman, R. M.
Venue
Annual Review of Immunology
Published
1991-04
Volume
9
Issue
1
Pages
271-296
ISSN
  • 0732-0582 (ISSN-L)
  • 1545-3278
OpenAlex
W2177327503
Cited by
4,658
References
0
FWCI
45.89
Type
journal article
Language
en
Open access
closed

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