T Cell Activation by CD1 and Lipid Antigens by D. Branch MoodyEnglish | PDF | 2007 | 346 Pages | ISBN : 3540695109 | 5.23 MB
For decades, T cells were thought to solely respond to protein-derived antigens. However, the discovery of the CD1 antigen presenting system shows how antigen presenting cells can display lipid antigens to T cells. Crystal structures show that CD1 proteins accomplish this function by inserting lipids into a hydrophobic groove on the distal surface of the protein, forming CD1-lipid complexes that act as ligands for T cell receptors. CD1-reactive T cells with conserved (NK T cells) or diverse T cell receptors possess cytokine secretion and other effector mechanisms that influence many aspects of immune response.