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Dendritic cells transduced with autoantigen FCRLA induce cytotoxic lymphocytes and vaccinate against murine B-cell lymphoma.

J Invest Dermatol. 2007 Dec;127(12):2818-22. Epub 2007 Jul 12
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摘要


We previously reported early evidence of the human Fc receptor-like A (hFCRLA), an antigen (Ag) that was specifically expressed in melanocytes, melanoma cells, and some B-cell states, and was recognized by IgG antibodies from melanoma patients. Recently, it has been demonstrated that hFCRLA is expressed in most human B-cell lymphoma tissues. In this report, we investigated the potential of FCRLA as a tumor-associated Ag of B-cell lymphoma for immunotherapy. We confirmed that murine FCRLA (mFCRLA) was expressed and distributed in murine tissues similar to hFCRLA. Recombinant mFCRLA fusion protein was constructed with a polyarginine (R9)-protein-transduction domain (PTD) (rR9-HA-mFCRL), and was transduced into bone marrow-derived dendritic cells (DC) ex vivo. Mice immunized with rR9-HA-mFCRL-treated DC primed cytotoxic T-lymphocyte (CTL) that killed the B-cell lymphoma cell line (A20), which express mFCRLA abundantly. In a tumor challenging study, A20 tumor growth inoculated in skin was significantly suppressed in mice vaccinated with rR9-HA-mFCRL-treated DC, compared with control mice. These results indicated that FCRLA is a potential target Ag in immunotherapy for B-cell lymphoma. In addition, our experimental system using R9-PTD-containing full-length proteins might be a useful method to analyze the immunogenicity of novel candidates of tumor-associated Ags in vivo.

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