title: CD74: an emerging opportunity as a therapeutic target in cancer and autoimmune disease.
abstract: BACKGROUND
  CD74, also known as the invariant chain, participates in several key processes of the immune system, including antigen presentation, B-cell differentiation and inflammatory signaling. Despite being described more than 3 decades ago, new functions and novel interactions for this evolutionarily conserved molecule are still being unraveled. As a participant in several immunological processes and an indicator of disease in some conditions, it has potential as a therapeutic target.
  
  
  METHODS
  The relationship between the structure of CD74 variants and their physiological functions is detailed in this review. The function of CD74 in several cell lineages is examined with a focus on the interactions with cathepsins and, in an inflammatory milieu, the pro-inflammatory cytokine macrophage migratory inhibitory factor. The role of CD74 signaling in inflammatory and carcinogenic processes is outlined as is the use of CD74 as a therapeutic target (in cancer) and tool (as a vaccine).
  
  
  CONCLUSIONS
  CD74 has several roles within the cell and throughout the immune system. Most prominent amongst these are the complex relationships with MIF and cathepsins. Modulation of CD74 function shows promise for the effective amelioration of disease.
authors.affiliation: Sapienza University of Rome, Department of Clinical Medicine, Clinical Immunology Unit, Umberto I Policlinico di Roma, 155 Viale del Policlinico, Rome, IT 00161.
authors.forename: Federica
authors.initials: F
authors.lastname: Borghese
authors.forename: Felix I L
authors.initials: FI
authors.lastname: Clanchy
mesh_terms: D000818:Animals; D000944:Antigens, Differentiation, B-Lymphocyte / Q000276:immunology / Q000378:metabolism*; D001327:Autoimmune Diseases / Q000188:drug therapy / Q000276:immunology; D002403:Cathepsins / Q000378:metabolism; D016503:Drug Delivery Systems; D000949:Histocompatibility Antigens Class II / Q000276:immunology / Q000378:metabolism*; D006801:Humans; D007249:Inflammation / Q000503:physiopathology; D009369:Neoplasms / Q000188:drug therapy / Q000503:physiopathology
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D000949:Histocompatibility Antigens Class II; C045084:invariant chain; D002403:Cathepsins