Gene transfer of costimulatory molecules B7–1 and B7–2 into human multiple myeloma cells by recombinant adeno-associated virus enhances the cytolytic T cell response

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Abstract

Gene transfer of the costimulatory molecules of B7–1 and B7–2 induces a potent antitumor immune response in a variety of tumor models. B cell neoplasms including multiple myeloma (MM) often show little or no expression of B7 antigens; they are therefore a potential target for this approach. To increase the expression of human B7 genes in MM cells, both genes and the neomycin phosphotransferase gene were packaged into recombinant adeno-associated virus vectors (rAAV). The resulting recombinant viruses rAAV/B7–1, rAAV/B7–2 and rAAV/Neo were used to transduce the MM cell lines LP-1 and RPMI 8226. This allowed the transduction of up to 80% of LP-1 cells 4 days after infection with purified rAAV particles. The response of human allogeneic T cells to rAAV/B7–1 and rAAV/B7–2 transduced, γ-irradiated LP-1 cells was assessed by [3H]thymidine incorporation, by RT-PCR-based detection of immunostimulatory cytokine transcripts and by ELISA quantification of cytokines in the supernatant. Stimulation of T cells with rAAV/B7–1 or rAAV/B7–2 transduced LP-1 cells resulted in an up to 10-fold increase of T cell proliferation when compared with LP-1 cells transduced with rAAV/Neo. Similar results were obtained with RPMI 8226 cells. Both rAAV/B7–1 and rAAV/B7–2 transduced LP-1 cells stimulated the T cell secretion of IL-2 and IFN-γ. Furthermore, [51Cr] release assays showed that rAAV/B7–1 or rAAV/B7–2 transduced LP-1 cells induced a cytolytic T cell (CTL) response, in contrast to LP-1 cells transduced with rAAV/Neo. In all assays, the effects of rAAV/B7–1 and rAAV/B7–2 were similar. Taken together, the results show that rAAV-mediated transfer of B7 genes into MM cell lines is able to enhance the antitumor T cell response and to elicit a cytolytic T cell response.

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Wendtner, C., Nolte, A., Mangold, E. et al. Gene transfer of costimulatory molecules B7–1 and B7–2 into human multiple myeloma cells by recombinant adeno-associated virus enhances the cytolytic T cell response. Gene Ther 4, 726–735 (1997) doi:10.1038/sj.gt.3300447

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Keywords

  • B7
  • adeno-associated virus (AAV)
  • lymphoma
  • multiple myeloma
  • immunotherapy
  • gene therapy

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