Identification of novel antigens with induced immune response in monoclonal gammopathy of undetermined significance

Thetransformationfrommonoclonalgam-mopathy of undetermined significance (MGUS) to multiple myeloma (MM) is thought to be associated with changes in immune processes. We have therefore used serologic analysis of recombinant cDNA expression library to screen the sera of MGUS patients to identify tumor-associated antigens. A total of 10 antigens were identified, with specific antibody responses in MGUS. Responses appeared to be directed against intracellular proteins involved in cellular functions, such as apoptosis (SON, IFT57/HIPPI), DNA and RNA binding (ZNF292, GPATCH4), signal transduction regulators (AKAP11), transcriptionalcorepressor(IRF2BP2),de-velopmental proteins (OFD1), and proteins of the ubiquitin-proteasome pathway (PSMC1). Importantly, the gene responsible for the oral-facial-digital type I syndrome (OFD1) had response in 6 of 29 (20.6%) MGUS patients but 0 of 11 newly diagnosed MM patients. Interest-ingly, 3 of 11 (27.2%) MM patients after autologous stem cell transplantations showed responses to OFD1. We have confirmed T-cell responses against OFD1 in MGUS and observed down-regulation ofGLI1/PTCH1andp- (cid:1) -cateninafter OFD1 knock-downwithspecificsiRNA,suggest-ing its functional role in the regulation of Hh and Wnt pathways. These findings demonstrate OFD1 as an important immune target and highlight its possible role in signal transduction and tumorigenesis in MGUS and MM. (Blood. 2009;114: 3276-3284)

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