Serological identification of HSP105 as a novel non-Hodgkin lymphoma therapeutic target

Roberta Zappasodi, Italia Bongarzone, Gaia C. Ghedini, Lorenzo Castagnoli, Antonello D. Cabras, Antonella Messina, Monica Tortoreto, Claudio Tripodo, Michele Magni, Carmelo Carlo-Stella, Alessandro M. Gianni, Serenella M. Pupa, Massimo Di Nicola

Research output: Contribution to journalArticlepeer-review

Abstract

We reported that the clinical efficacy of dendritic cell-based vaccination is strongly associated with immunologic responses in relapsed B-cell non-Hodgkin lymphoma (B-NHL) patients. We have now investigated whether postvaccination antibodies from responders recognize novel shared NHL-restricted antigens. Immunohistochemistry and flow cytometry showed that they cross-react with allogeneic BNHLs at significantly higher levels than their matched prevaccination samples or nonresponders' antibodies. Western blot analysis of DOHH-2 lymphoma proteome revealed a sharp band migrating at approximately 100 to 110 kDa only with postvaccine repertoires from responders. Mass spectrometry identified heat shock protein-105 (HSP105) in that molecular weight interval. Flow cytometry and immunohistochemistry disclosed HSP105 on the cell membrane and in the cytoplasm of B-NHL cell lines and 97 diagnostic specimens. A direct correlation between HSP105 expression and lymphoma aggressiveness was also apparent. Treatment of aggressive human B-NHL cell lines with an anti-HSP105 antibody had no direct effects on cell cycle or apoptosis but significantly reduced the tumor burden in xenotransplanted immunodeficient mice. In vivo antilymphoma activity of HSP105 engagement was associated with a significant local increase of Granzyme B + killer cells that very likely contributed to the tumor-restricted necrosis. Our study adds HSP105 to the list of nononcogenes that can be exploited as antilymphoma targets.

Original languageEnglish
Pages (from-to)4421-4430
Number of pages10
JournalBlood
Volume118
Issue number16
DOIs
Publication statusPublished - Oct 20 2011

ASJC Scopus subject areas

  • Hematology
  • Biochemistry
  • Cell Biology
  • Immunology

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