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The FASEB Journal, Vol 3, 2496-2502, Copyright © 1989 by The Federation of American Societies for Experimental Biology
REVIEWS |
ER Unanue and JC Cerottini
Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110.
This paper reviews some of the cellular events involved in the immune recognition of foreign proteins. The recognition of an antigen by T lymphocytes is essential for its effective elimination by the host. T lymphocytes of the CD4 or CD8 subset recognize antigen but only after the antigen is handled by antigen-handling cells (antigen-presenting cells). Antigen molecules are recognized after an internal processing event by antigen-presenting cells that results in the generation of immunogenic peptides. Such peptides associate with histocompatibility molecules to form bimolecular complexes on the cell surface. The T cell receptors for antigen recognize the bimolecular complex and initiate the events that result in an inflammatory response. Antigen-presenting cells also produce molecules - termed costimulators - that stimulate the growth and differentiation of T lymphocytes.
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