title: Lysosomal cysteine proteases and antigen presentation.
abstract: Lysosomal proteinases are involved in two critical stages of MHC class II-mediated antigen presentation, i.e., degradation of invariant chain, a chaperone molecule critical for MHC class II assembly and transport, and generation of class II-binding peptides in the endocytic compartment. We found that two lysosomal cysteine proteinases, cathepsins S and L, were found to be differentially expressed in different types of "professional" and "nonprofessional" antigen presenting cells, including B cells, macrophages, specialized thymic epithelium, intestinal epithelium, and dendritic cells. In this chapter, our recent studies on the role of cathepsin S and L in MHC class II-mediated antigen processing and presentation in these cells types are highlighted.
authors.affiliation: Howard Hughes Medical Institute, University of Washington School of Medicine, Seattle 98195, USA. aruden@u.washington.edu
authors.forename: A
authors.initials: A
authors.lastname: Rudensky
authors.forename: C
authors.initials: C
authors.lastname: Beers
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000502:physiology*; D000938:Antigen-Presenting Cells / Q000378:metabolism; D000944:Antigens, Differentiation, B-Lymphocyte / Q000235:genetics / Q000378:metabolism; D056668:Cathepsin L; D002403:Cathepsins / Q000378:metabolism; D003546:Cysteine Endopeptidases / Q000378:metabolism*; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000378:metabolism; D008247:Lysosomes / Q000201:enzymology*; D008264:Macrophages / Q000276:immunology / Q000378:metabolism; D010455:Peptides / Q000378:metabolism
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D000949:Histocompatibility Antigens Class II; D010455:Peptides; C045084:invariant chain; D002403:Cathepsins; D003546:Cysteine Endopeptidases; D056668:Cathepsin L; C028217:cathepsin S