BACKGROUND: Prostate cancer (PCa) is the most common malignant disease in men. Novel treatment options are needed for patients after development of metastatic, hormone-refractory disease or for those who have failed a local treatment. The prostate stem cell antigen (PSCA) is expressed in >80% of primary PCa samples and bone metastases. Its expression is increased both in androgen-dependent and independent prostate tumors, particularly in carcinomas of high stages and Gleason scores. Therefore, PSCA is an attractive target for immunotherapy of PCa by retargeting of T cells to tumor cells. METHODS: A series of different bispecific antibody formats for retargeting of T cells to tumor cells were described but, only very limited data obtained by side by side comparison of the different antibody formats are available. We established two novel bispecific antibodies in different formats. The functionality of both constructs was analyzed by FACS and chromium release assays. In parallel, the release of pro-inflammatory cytokines was determined by ELISA. RESULTS AND CONCLUSIONS: Irrespective of the underlying antibody format, both novel bispecific antibodies cause an efficient killing of PSCA-positive tumor cells by pre- and non-pre-activated T cells. Killing and release of pro-inflammatory cytokines requires an antigen specific cross-linkage of the T cells with the target cells.
BACKGROUND:Prostate cancer (PCa) is the most common malignant disease in men. Novel treatment options are needed for patients after development of metastatic, hormone-refractory disease or for those who have failed a local treatment. The prostate stem cell antigen (PSCA) is expressed in >80% of primary PCa samples and bone metastases. Its expression is increased both in androgen-dependent and independent prostate tumors, particularly in carcinomas of high stages and Gleason scores. Therefore, PSCA is an attractive target for immunotherapy of PCa by retargeting of T cells to tumor cells. METHODS: A series of different bispecific antibody formats for retargeting of T cells to tumor cells were described but, only very limited data obtained by side by side comparison of the different antibody formats are available. We established two novel bispecific antibodies in different formats. The functionality of both constructs was analyzed by FACS and chromium release assays. In parallel, the release of pro-inflammatory cytokines was determined by ELISA. RESULTS AND CONCLUSIONS: Irrespective of the underlying antibody format, both novel bispecific antibodies cause an efficient killing of PSCA-positive tumor cells by pre- and non-pre-activated T cells. Killing and release of pro-inflammatory cytokines requires an antigen specific cross-linkage of the T cells with the target cells.
Authors: Stefanie Koristka; Marc Cartellieri; Claudia Arndt; Anja Feldmann; Barbara Seliger; Gerhard Ehninger; Michael P Bachmann Journal: Oncoimmunology Date: 2015-01-23 Impact factor: 8.110
Authors: Elham Pishali Bejestani; Marc Cartellieri; Ralf Bergmann; Armin Ehninger; Simon Loff; Michael Kramer; Johannes Spehr; Antje Dietrich; Anja Feldmann; Susann Albert; Martin Wermke; Michael Baumann; Mechthild Krause; Martin Bornhäuser; Gerhard Ehninger; Michael Bachmann; Malte von Bonin Journal: Oncoimmunology Date: 2017-06-20 Impact factor: 8.110
Authors: C Arndt; A Feldmann; M von Bonin; M Cartellieri; E-M Ewen; S Koristka; I Michalk; S Stamova; N Berndt; A Gocht; M Bornhäuser; G Ehninger; M Schmitz; M Bachmann Journal: Leukemia Date: 2013-08-20 Impact factor: 11.528
Authors: Tanya B Dorff; Vivek Narayan; Stephen J Forman; Peter D Zang; Joseph A Fraietta; Carl H June; Naomi B Haas; Saul J Priceman Journal: Clin Cancer Res Date: 2022-02-15 Impact factor: 13.801
Authors: R Aliperta; M Cartellieri; A Feldmann; C Arndt; S Koristka; I Michalk; M von Bonin; A Ehninger; J Bachmann; G Ehninger; M Bornhäuser; M P Bachmann Journal: Blood Cancer J Date: 2015-09-18 Impact factor: 11.037