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Sperm protein 17 (Sp17) is a suitable target for immunotherapy of multiple myeloma by Maurizio Chiriva-Internati, Zhiqing Wang, Emanuela Salati, Klaus.

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Presentation on theme: "Sperm protein 17 (Sp17) is a suitable target for immunotherapy of multiple myeloma by Maurizio Chiriva-Internati, Zhiqing Wang, Emanuela Salati, Klaus."— Presentation transcript:

1 Sperm protein 17 (Sp17) is a suitable target for immunotherapy of multiple myeloma by Maurizio Chiriva-Internati, Zhiqing Wang, Emanuela Salati, Klaus Bumm, Bart Barlogie, and Seah H. Lim Blood Volume 100(3):961-965 August 1, 2002 ©2002 by American Society of Hematology

2 Successful generation of Sp17-specific CTLs from PBMCs of patients with MM.Sp17-specific CTLs lysed autologous DC pulsed with Sp17 recombinant protein but not the control target cells. Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

3 Target cell killing with EBV-transformed autologous LCLs.When Sp17-specific CTLs from patient 1 were used as effector cells against autologous LCLs pulsed with Sp17 recombinant protein, target lysis was observed in LCLs pulsed with the recombinant protein a... Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

4 Sp17 recombinant protein-primed CTLs could lyse autologous tumor cells expressing Sp17.Tumor cell cytotoxicity by CTLs could be blocked by a monoclonal antibody directed at monomorphic HLA class I molecules but not HLA class II molecules (patients 1-3 were... Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

5 Blocking of tumor cell lysis.Tumor cell lysis by Sp17 recombinant protein-primed CTLs derived from patient 1 could be blocked by autologous Sp17+ LCLs but not Sp17− LCL (LCL/tumor cell ratio, 40:1), confirming the specificity of the tumor cell kill. Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

6 Flow cytometric analysis of the CTL lines showed that they were made up predominantly of CD8+ T cells, most of which were CD56−. Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

7 Flow cytometric analysis for intracellular cytokines showed that the CTL line produced predominantly IFN-γ and very little IL-4. Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology

8 Autologous tumor cell lysis by Sp17-specific CTLs could be blocked by CMA but not Brefeldin A, suggesting that target cell cytotoxicity was mediated via the perforin pathway. Maurizio Chiriva-Internati et al. Blood 2002;100:961-965 ©2002 by American Society of Hematology


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