title: Cathepsins and compartmentalization in antigen presentation.
abstract: Intracellular trafficking and cell surface expression of MHC class II molecules is a tightly regulated process and is to a large extent, determined by the fate of the class II chaperone, the invariant chain. Inhibition of endosomal proteases critical to invariant chain proteolysis reveals marked shunting of class II complexes to lysosomal compartments. Regulation of endosomal protease activity by expression of cystatin C directs class II cell surface expression during maturation of dendritic cells. These studies highlight the taut interactions between class-II-invariant-chain complexes and endosomal proteases during MHC class II maturation.
authors.affiliation: Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Riese
authors.forename: H A
authors.initials: HA
authors.lastname: Chapman
mesh_terms: D017951:Antigen Presentation; D000944:Antigens, Differentiation, B-Lymphocyte / Q000378:metabolism; D002403:Cathepsins / Q000378:metabolism*; D002451:Cell Compartmentation; D011992:Endosomes / Q000201:enzymology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology* / Q000378:metabolism; D011480:Protease Inhibitors
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D000949:Histocompatibility Antigens Class II; D011480:Protease Inhibitors; C045084:invariant chain; D002403:Cathepsins