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Zhu J, Gillissen B, Dang Tran DL, May S, Ulrich C, Stockfleth E, Eberle J. Inhibition of Cell Proliferation and Cell Viability by Sinecatechins in Cutaneous SCC Cells Is Related to an Imbalance of ROS and Loss of Mitochondrial Membrane Potential. Antioxidants (Basel) 2022; 11:antiox11071416. [PMID: 35883905 PMCID: PMC9312260 DOI: 10.3390/antiox11071416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/17/2022] [Accepted: 07/18/2022] [Indexed: 02/05/2023] Open
Abstract
The term sinecatechins designates an extract containing a high percentage of catechins obtained from green tea, which is commercially registered as Veregen or Polyphenon E (PE) and may be considered for treatment of cutaneous squamous cell carcinoma (cSCC) and actinic keratosis (AK). As shown here, treatment of four cSCC cell lines with 200 µg/mL of PE resulted in strong, dose-dependent decrease in cell proliferation (20–30%) as well as strongly decreased cell viability (4–21% of controls, 48 h). Effects correlated with loss of mitochondrial membrane potential, whereas early apoptosis was less pronounced. At the protein level, some activation of caspase-3 and enhanced expression of the CDK inhibitor p21 were found. Loss of MMP and induced cell death were, however, largely independent of caspases and of the proapoptotic Bcl-2 proteins Bax and Bak, suggesting that sinecatechins induce also non-apoptotic, alternative cell death pathways, in addition to apoptosis. Reactive oxygen species (ROS) were downregulated in response to PE at 4 h, followed by an increase at 24 h. The contributory role of initially reduced ROS was supported by the antioxidant N-acetyl cysteine, which in combination with PE further enhanced the negative effects on cell viability. Thus, sinecatechins inhibited cell proliferation and viability of cSCC cells, which could suggest the use of PE for AK treatment. The mechanisms appear as linked to an imbalance of ROS levels.
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Affiliation(s)
- Jiaqi Zhu
- Skin Cancer Centre Charité, Department of Dermatology and Allergy, Charité–Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany; (J.Z.); (D.L.D.T.); (S.M.); (C.U.)
- Department of Gynecology and Obstetrics, Jilin University, Changchun 130001, China
| | - Bernd Gillissen
- Department of Hematology, Oncology, and Tumor Immunology, Charité–Universitätsmedizin Berlin, 13125 Berlin, Germany;
| | - Dieu Linh Dang Tran
- Skin Cancer Centre Charité, Department of Dermatology and Allergy, Charité–Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany; (J.Z.); (D.L.D.T.); (S.M.); (C.U.)
- Beuth-Hochschule für Technik Berlin–University of Applied Sciences, Luxemburger Str. 10, 13353 Berlin, Germany
| | - Stefanie May
- Skin Cancer Centre Charité, Department of Dermatology and Allergy, Charité–Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany; (J.Z.); (D.L.D.T.); (S.M.); (C.U.)
| | - Claas Ulrich
- Skin Cancer Centre Charité, Department of Dermatology and Allergy, Charité–Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany; (J.Z.); (D.L.D.T.); (S.M.); (C.U.)
| | - Eggert Stockfleth
- Dermatologie, Venerologie und Allergologie, Klinikum Bochum, Ruhr-Universität Bochum, Gudrunstr. 56, 44791 Bochum, Germany;
| | - Jürgen Eberle
- Skin Cancer Centre Charité, Department of Dermatology and Allergy, Charité–Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany; (J.Z.); (D.L.D.T.); (S.M.); (C.U.)
- Correspondence: ; Tel.: +49-30-450-518-383
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Wurster KD, Costanza M, Kreher S, Glaser S, Lamprecht B, Schleussner N, Anagnostopoulos I, Hummel M, Jöhrens K, Stein H, Molina A, Diepstra A, Gillissen B, Köchert K, Siebert R, Merkel O, Kenner L, Janz M, Mathas S. Aberrant Expression of and Cell Death Induction by Engagement of the MHC-II Chaperone CD74 in Anaplastic Large Cell Lymphoma (ALCL). Cancers (Basel) 2021; 13:cancers13195012. [PMID: 34638496 PMCID: PMC8507667 DOI: 10.3390/cancers13195012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 09/23/2021] [Indexed: 12/04/2022] Open
Abstract
Simple Summary Anaplastic large cell lymphoma (ALCL) is a lymphoid malignancy considered to be derived from T cells. Currently, two types of systemic ALCL are distinguished: anaplastic lymphoma kinase (ALK)-positive and ALK-negative ALCL. Although ALK+ and ALK− ALCL differ at the genomic and molecular levels, various key biological and molecular features are highly similar between both entities. We have developed the concept that both ALCL entities share a common principle of pathogenesis. In support of this concept, we here describe a common deregulation of CD74, which is usually not expressed in T cells, in ALCL. Ligation of CD74 induces cell death of ALCL cells in various conditions, and an anti-CD74-directed antibody-drug conjugate efficiently kills ALCL cell lines. Furthermore, we reveal expression of the proto-oncogene and known CD74 interaction partner MET in a fraction of ALCL cases. These data give insights into ALCL pathogenesis and might help to develop new treatment strategies for ALCL. Abstract In 50–60% of cases, systemic anaplastic large cell lymphoma (ALCL) is characterized by the t(2;5)(p23;q35) or one of its variants, considered to be causative for anaplastic lymphoma kinase (ALK)-positive (ALK+) ALCL. Key pathogenic events in ALK-negative (ALK−) ALCL are less well defined. We have previously shown that deregulation of oncogenic genes surrounding the chromosomal breakpoints on 2p and 5q is a unifying feature of both ALK+ and ALK− ALCL and predisposes for occurrence of t(2;5). Here, we report that the invariant chain of the MHC-II complex CD74 or li, which is encoded on 5q32, can act as signaling molecule, and whose expression in lymphoid cells is usually restricted to B cells, is aberrantly expressed in T cell-derived ALCL. Accordingly, ALCL shows an altered DNA methylation pattern of the CD74 locus compared to benign T cells. Functionally, CD74 ligation induces cell death of ALCL cells. Furthermore, CD74 engagement enhances the cytotoxic effects of conventional chemotherapeutics in ALCL cell lines, as well as the action of the ALK-inhibitor crizotinib in ALK+ ALCL or of CD95 death-receptor signaling in ALK− ALCL. Additionally, a subset of ALCL cases expresses the proto-oncogene MET, which can form signaling complexes together with CD74. Finally, we demonstrate that the CD74-targeting antibody-drug conjugate STRO-001 efficiently and specifically kills CD74-positive ALCL cell lines in vitro. Taken together, these findings enabled us to demonstrate aberrant CD74-expression in ALCL cells, which might serve as tool for the development of new treatment strategies for this lymphoma entity.
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Affiliation(s)
- Kathrin D. Wurster
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Mariantonia Costanza
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Stephan Kreher
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Selina Glaser
- Institute of Human Genetics, Ulm University, Ulm University Medical Center, 89081 Ulm, Germany; (S.G.); (R.S.)
| | - Björn Lamprecht
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
- German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany;
| | - Nikolai Schleussner
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Ioannis Anagnostopoulos
- Institute of Pathology, Charité–Universitätsmedizin Berlin, 10117 Berlin, Germany; (I.A.); (K.J.)
| | - Michael Hummel
- German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany;
- Institute of Pathology, Charité–Universitätsmedizin Berlin, 10117 Berlin, Germany; (I.A.); (K.J.)
| | - Korinna Jöhrens
- Institute of Pathology, Charité–Universitätsmedizin Berlin, 10117 Berlin, Germany; (I.A.); (K.J.)
| | | | - Arturo Molina
- Sutro Biopharma, South San Francisco, CA 94080, USA;
| | - Arjan Diepstra
- Department of Pathology and Medical Biology, University of Groningen, University Medical Centre Groningen, 9700 RB Groningen, The Netherlands;
| | - Bernd Gillissen
- Department of Hematology, Oncology, and Tumor Immunology, Charité–Universitätsmedizin Berlin, 13125 Berlin, Germany;
| | - Karl Köchert
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Reiner Siebert
- Institute of Human Genetics, Ulm University, Ulm University Medical Center, 89081 Ulm, Germany; (S.G.); (R.S.)
| | - Olaf Merkel
- Unit of Experimental and Laboratory Animal Pathology, Department of Pathology, Medical University of Vienna, 1090 Vienna, Austria; (O.M.); (L.K.)
- European Research Initiative on ALK-related malignancies (ERIA), 1090 Vienna, Austria
| | - Lukas Kenner
- Unit of Experimental and Laboratory Animal Pathology, Department of Pathology, Medical University of Vienna, 1090 Vienna, Austria; (O.M.); (L.K.)
- European Research Initiative on ALK-related malignancies (ERIA), 1090 Vienna, Austria
| | - Martin Janz
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
| | - Stephan Mathas
- Max-Delbrück-Center (MDC) for Molecular Medicine, 13125 Berlin, Germany; (M.C.); (N.S.); (M.J.)
- Department of Hematology, Oncology and Cancer Immunology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 12200 Berlin, Germany
- Experimental and Clinical Research Center, a joint cooperation between the Charité and the MDC, 13125 Berlin, Germany
- German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany;
- European Research Initiative on ALK-related malignancies (ERIA), 1090 Vienna, Austria
- Correspondence: ; Tel.: +49-30-94062863; Fax: +49-30-94063124
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Schleussner N, Merkel O, Costanza M, Liang HC, Hummel F, Romagnani C, Durek P, Anagnostopoulos I, Hummel M, Jöhrens K, Niedobitek A, Griffin PR, Piva R, Sczakiel HL, Woessmann W, Damm-Welk C, Hinze C, Stoiber D, Gillissen B, Turner SD, Kaergel E, von Hoff L, Grau M, Lenz G, Dörken B, Scheidereit C, Kenner L, Janz M, Mathas S. The AP-1-BATF and -BATF3 module is essential for growth, survival and TH17/ILC3 skewing of anaplastic large cell lymphoma. Leukemia 2018; 32:1994-2007. [PMID: 29588546 PMCID: PMC6127090 DOI: 10.1038/s41375-018-0045-9] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 12/20/2017] [Accepted: 01/08/2018] [Indexed: 01/26/2023]
Abstract
Transcription factor AP-1 is constitutively activated and IRF4 drives growth and survival in ALK+ and ALK- anaplastic large cell lymphoma (ALCL). Here we demonstrate high-level BATF and BATF3 expression in ALCL. Both BATFs bind classical AP-1 motifs and interact with in ALCL deregulated AP-1 factors. Together with IRF4, they co-occupy AP-1-IRF composite elements, differentiating ALCL from non-ALCL. Gene-specific inactivation of BATFs, or global AP-1 inhibition results in ALCL growth retardation and/or cell death in vitro and in vivo. Furthermore, the AP-1-BATF module establishes TH17/group 3 innate lymphoid cells (ILC3)-associated gene expression in ALCL cells, including marker genes such as AHR, IL17F, IL22, IL26, IL23R and RORγt. Elevated IL-17A and IL-17F levels were detected in a subset of children and adolescents with ALK+ ALCL. Furthermore, a comprehensive analysis of primary lymphoma data confirms TH17-, and in particular ILC3-skewing in ALCL compared with PTCL. Finally, pharmacological inhibition of RORC as single treatment leads to cell death in ALCL cell lines and, in combination with the ALK inhibitor crizotinib, enforces death induction in ALK+ ALCL. Our data highlight the crucial role of AP-1/BATFs in ALCL and lead to the concept that some ALCL might originate from ILC3.
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Affiliation(s)
- Nikolai Schleussner
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Olaf Merkel
- Institute of Clinical Pathology, Medical University of Vienna, Vienna, Austria.,European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK
| | - Mariantonia Costanza
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany.,European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK
| | - Huan-Chang Liang
- Institute of Clinical Pathology, Medical University of Vienna, Vienna, Austria.,European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK
| | - Franziska Hummel
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Chiara Romagnani
- German Rheumatism Research Centre, German Rheumatism Research Centre (DRFZ), A Leibniz Institute, 10117, Berlin, Germany.,Medical Department I, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Pawel Durek
- German Rheumatism Research Centre, German Rheumatism Research Centre (DRFZ), A Leibniz Institute, 10117, Berlin, Germany
| | | | - Michael Hummel
- Institute of Pathology, Charité-Universitätsmedizin Berlin, 10117, Berlin, Germany.,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120, Heidelberg, Germany
| | - Korinna Jöhrens
- Institute of Pathology, Charité-Universitätsmedizin Berlin, 10117, Berlin, Germany
| | - Antonia Niedobitek
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | | | - Roberto Piva
- Department of Molecular Biotechnology and Health Sciences, Center for Experimental Research and Medical Studies, University of Torino, Torino, Italy
| | - Henrike L Sczakiel
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Wilhelm Woessmann
- European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK.,NHL-BFM Study Centre and Department of Paediatric Haematology and Oncology, Justus-Liebig-University, Giessen, Germany
| | - Christine Damm-Welk
- European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK.,NHL-BFM Study Centre and Department of Paediatric Haematology and Oncology, Justus-Liebig-University, Giessen, Germany
| | - Christian Hinze
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Department of Nephrology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Dagmar Stoiber
- Institute of Pharmacology, Center for Physiology and Pharmacology, Medical University Vienna, Vienna, Austria.,Ludwig Boltzmann Institute for Cancer Research (LBI-CR), Vienna, Austria
| | - Bernd Gillissen
- Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany
| | - Suzanne D Turner
- European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK.,Department of Pathology, University of Cambridge, Cambridge, CB21QP, UK
| | - Eva Kaergel
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany
| | - Linda von Hoff
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany
| | - Michael Grau
- Department of Medicine A, Albert-Schweitzer-Campus 1, University Hospital Münster, 48149, Münster, Germany.,Cluster of Excellence EXC 1003, Cells in Motion, 48149, Münster, Germany
| | - Georg Lenz
- Department of Medicine A, Albert-Schweitzer-Campus 1, University Hospital Münster, 48149, Münster, Germany.,Cluster of Excellence EXC 1003, Cells in Motion, 48149, Münster, Germany
| | - Bernd Dörken
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany.,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120, Heidelberg, Germany
| | | | - Lukas Kenner
- Institute of Clinical Pathology, Medical University of Vienna, Vienna, Austria. .,European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK. .,Ludwig Boltzmann Institute for Cancer Research (LBI-CR), Vienna, Austria. .,University of Veterinary Medicine, Vienna, Austria. .,CBmed, Center for Biomarker Research in Medicine, 8010, Graz, Austria.
| | - Martin Janz
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany.,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany.,Experimental and Clinical Research Center, a joint cooperation of Max-Delbrück-Center for Molecular Medicine and Charité - Universitätsmedizin Berlin, 13125, Berlin, Germany
| | - Stephan Mathas
- Max-Delbrück-Center for Molecular Medicine, 13125, Berlin, Germany. .,Hematology, Oncology, and Tumor Immunology, Charité-Universitätsmedizin Berlin, 12200, Berlin, Germany. .,European Research Initiative on ALK-Related Malignancies (ERIA), Cambridge, UK. .,German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), 69120, Heidelberg, Germany. .,Experimental and Clinical Research Center, a joint cooperation of Max-Delbrück-Center for Molecular Medicine and Charité - Universitätsmedizin Berlin, 13125, Berlin, Germany.
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Gohlke BO, Overkamp T, Richter A, Richter A, Daniel PT, Gillissen B, Preissner R. 2D and 3D similarity landscape analysis identifies PARP as a novel off-target for the drug Vatalanib. BMC Bioinformatics 2015; 16:308. [PMID: 26403354 PMCID: PMC4582733 DOI: 10.1186/s12859-015-0730-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 09/08/2015] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Searching for two-dimensional (2D) structural similarities is a useful tool to identify new active compounds in drug-discovery programs. However, as 2D similarity measures neglect important structural and functional features, similarity by 2D might be underestimated. In the present study, we used combined 2D and three-dimensional (3D) similarity comparisons to reveal possible new functions and/or side-effects of known bioactive compounds. RESULTS We utilised more than 10,000 compounds from the SuperTarget database with known inhibition values for twelve different anti-cancer targets. We performed all-against-all comparisons resulting in 2D similarity landscapes. Among the regions with low 2D similarity scores are inhibitors of vascular endothelial growth factor receptor (VEGFR) and inhibitors of poly ADP-ribose polymerase (PARP). To demonstrate that 3D landscape comparison can identify similarities, which are untraceable in 2D similarity comparisons, we analysed this region in more detail. This 3D analysis showed the unexpected structural similarity between inhibitors of VEGFR and inhibitors of PARP. Among the VEGFR inhibitors that show similarities to PARP inhibitors was Vatalanib, an oral "multi-targeted" small molecule protein kinase inhibitor being studied in phase-III clinical trials in cancer therapy. An in silico docking simulation and an in vitro HT universal colorimetric PARP assay confirmed that the VEGFR inhibitor Vatalanib exhibits off-target activity as a PARP inhibitor, broadening its mode of action. CONCLUSION In contrast to the 2D-similarity search, the 3D-similarity landscape comparison identifies new functions and side effects of the known VEGFR inhibitor Vatalanib.
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Affiliation(s)
- Bjoern-Oliver Gohlke
- Structural Bioinformatics Group, Charite - University Medicine Berlin & ECRC, Lindenberger Weg 80, 13125, Berlin, Germany.
| | - Tim Overkamp
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Humboldt University Berlin, Berlin, Germany.
| | - Anja Richter
- German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, Germany.
| | - Antje Richter
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Humboldt University Berlin, Berlin, Germany.
| | - Peter T Daniel
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Humboldt University Berlin, Berlin, Germany. .,German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, Germany. .,Clinical and Molecular Oncology, Max Delbrück Center for Molecular Medicine, 13125 Berlin-Buch, Berlin, Germany.
| | - Bernd Gillissen
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Humboldt University Berlin, Berlin, Germany. .,German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, Germany.
| | - Robert Preissner
- Structural Bioinformatics Group, Charite - University Medicine Berlin & ECRC, Lindenberger Weg 80, 13125, Berlin, Germany. .,German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, Germany.
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5
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Milojkovic A, Hemmati PG, Müer A, Overkamp T, Chumduri C, Jänicke RU, Gillissen B, Daniel PT. p14ARF induces apoptosis via an entirely caspase-3-dependent mitochondrial amplification loop. Int J Cancer 2013; 133:2551-62. [PMID: 23686572 DOI: 10.1002/ijc.28279] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 02/28/2013] [Indexed: 11/12/2022]
Abstract
The p14(ARF) tumor suppressor triggers cell death or cell cycle arrest upon oncogenic stress. In MCF-7 breast carcinoma cells, expression of the tumor suppressor gene p14(ARF) fails to trigger apoptosis but induces an arrest in the G1 and, to a lesser extent, in the G2 phase in the cell division cycle. Here, inhibition of cell cycle arrest resulted in apoptosis induction in caspase-3 proficient MCF-7 cells upon expression of p14(ARF) . This occurred in the absence of S-phase progression or mitotic entry. In contrast, syngeneic, caspase-3-deficient MCF-7 cells remained entirely resistant to p14(ARF) -induced apoptosis. Thus, cell cycle checkpoint abrogation overcomes resistance to p14(ARF) -induced cell death and promotes cell death via a caspase-3-dependent pathway. Cell death coincided with dissipation of the mitochondrial membrane potential, release of cytochrome c, and was inhibitable by pan-caspase inhibitors and the caspase-3/7 inhibitor zDEVD-fmk. Of note, mitochondrial events of apoptosis execution depended entirely on caspase-3 proficiency indicating that caspase-3 either acts "up-stream" of the mitochondria in a "non-canonical" pathway or mediates a mitochondrial feedback loop to amplify the apoptotic caspase signal in p14(ARF) -induced stress signaling.
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Affiliation(s)
- Ana Milojkovic
- Clinical and Molecular Oncology, Max Delbrück Centrum für Molekulare Medizin, Berlin-Buch, Germany
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Gillissen B, Richter A, Richter A, Overkamp T, Essmann F, Hemmati PG, Preissner R, Belka C, Daniel PT. Targeted therapy of the XIAP/proteasome pathway overcomes TRAIL-resistance in carcinoma by switching apoptosis signaling to a Bax/Bak-independent 'type I' mode. Cell Death Dis 2013; 4:e643. [PMID: 23703388 PMCID: PMC3674381 DOI: 10.1038/cddis.2013.67] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
TRAIL is a promising anticancer agent, capable of inducing apoptosis in a wide range of treatment-resistant tumor cells. In ‘type II' cells, the death signal triggered by TRAIL requires amplification via the mitochondrial apoptosis pathway. Consequently, deregulation of the intrinsic apoptosis-signaling pathway, for example, by loss of Bax and Bak, confers TRAIL-resistance and limits its application. Here, we show that despite resistance of Bax/Bak double-deficient cells, TRAIL-treatment resulted in caspase-8 activation and complete processing of the caspase-3 proenzymes. However, active caspase-3 was degraded by the proteasome and not detectable unless the XIAP/proteasome pathway was inhibited. Direct or indirect inhibition of XIAP by RNAi, Mithramycin A or by the SMAC mimetic LBW-242 as well as inhibition of the proteasome by Bortezomib overcomes TRAIL-resistance of Bax/Bak double-deficient tumor cells. Moreover, activation and stabilization of caspase-3 becomes independent of mitochondrial death signaling, demonstrating that inhibition of the XIAP/proteasome pathway overcomes resistance by converting ‘type II' to ‘type I' cells. Our results further demonstrate that the E3 ubiquitin ligase XIAP is a gatekeeper critical for the ‘type II' phenotype. Pharmacological manipulation of XIAP therefore is a promising strategy to sensitize cells for TRAIL and to overcome TRAIL-resistance in case of central defects in the intrinsic apoptosis-signaling pathway.
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Affiliation(s)
- B Gillissen
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Humboldt University, Berlin, Germany
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Müer A, Overkamp T, Gillissen B, Richter A, Pretzsch T, Milojkovic A, Dörken B, Daniel PT, Hemmati P. p14(ARF)-induced apoptosis in p53 protein-deficient cells is mediated by BH3-only protein-independent derepression of Bak protein through down-regulation of Mcl-1 and Bcl-xL proteins. J Biol Chem 2012; 287:17343-17352. [PMID: 22354970 DOI: 10.1074/jbc.m111.314898] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The p14(ARF) tumor suppressor plays a central role in regulating cell cycle arrest and apoptosis. We reported previously that p14(ARF) is capable of triggering apoptosis in a p53-independent manner. However, the mechanism remained unclear. Here we demonstrate that the p53-independent activation of the mitochondrial apoptosis pathway by p14(ARF) is primarily mediated by the pro-apoptotic Bax-homolog Bak. Expression of p14(ARF) exclusively triggers a N-terminal conformational switch of Bak, but not Bax, which allows for mitochondrial permeability shift, release of cytochrome c, activation of caspases, and subsequent fragmentation of genomic DNA. Although forced expression of Bak markedly sensitizes toward p14(ARF)-induced apoptosis, re-expression of Bax has no effect. Vice versa, knockdown of Bak by RNA interference attenuates p14(ARF)-induced apoptosis, whereas down-regulation of Bax has no effect. Bak activation coincides with a prominent, caspase-independent deprivation of the endogenous Bak inhibitors Mcl-1 and Bcl-x(L). In turn, mitochondrial apoptosis is fully blocked by overexpression of either Mcl-1 or Bcl-x(L). Taken together, these data indicate that in the absence of functional p53 and Bax, p14(ARF) triggers mitochondrial apoptosis signaling by activating Bak, which is facilitated by down-regulating anti-apoptotic Mcl-1 and Bcl-x(L). Moreover, our data suggest that the simultaneous inhibition of two central endogenous Bak inhibitors, i.e. Mcl-1 and Bcl-x(L), may be sufficient to activate mitochondrial apoptosis in the absence of BH3-only protein regulation.
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Affiliation(s)
- Annika Müer
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany
| | - Tim Overkamp
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany
| | - Bernd Gillissen
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany
| | - Antje Richter
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany
| | - Thomas Pretzsch
- Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, 13353 Berlin, Germany
| | - Ana Milojkovic
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany
| | - Bernd Dörken
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany; Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, 13353 Berlin, Germany
| | - Peter T Daniel
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany; Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, 13353 Berlin, Germany.
| | - Philipp Hemmati
- Experimental and Clinical Research Center (ECRC), Charité-Universitätsmedizin Berlin, Campus Berlin Buch, D13125, Berlin, Germany; Max-Delbrück-Center for Molecular Medicine, D13125, Berlin, Germany; Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, Campus Virchow-Klinikum, 13353 Berlin, Germany
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8
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Hemmati PG, Müer A, Gillissen B, Overkamp T, Milojkovic A, Wendt J, Dörken B, Daniel PT. Systematic genetic dissection of p14ARF-mediated mitochondrial cell death signaling reveals a key role for p21CDKN1 and the BH3-only protein Puma/bbc3. J Mol Med (Berl) 2010; 88:609-22. [PMID: 20419447 DOI: 10.1007/s00109-010-0606-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 01/27/2010] [Accepted: 01/29/2010] [Indexed: 11/29/2022]
Abstract
Induction of cell death by p14(ARF) is mediated through a Bax/Bak-dependent mitochondrial apoptosis pathway. To investigate the upstream signaling events required for the activation of Bax and/or Bak and to determine the functional impact of de-regulated cell cycle restriction point control in this context, we genetically dissected the impact of BH3-only proteins and the role of the cyclin-dependent kinase (cdk) inhibitor p21(CDKN1). Using isogenic HCT116 colorectal cancer cells, either wild-type or homozygously deleted for the BH3-only protein Puma/bbc3 and/or p21(CDKN1) or p53-reconstituted DU145 prostate cancer cells, we show that p14(ARF)-induced apoptosis is attenuated in the absence of Puma. Upon expression of p14(ARF) in HCT116 cells, Puma is rapidly induced at both the mRNA and protein level. Puma-proficient HCT116 cells undergo apoptotic (nuclear) DNA fragmentation, which is preceded by the N-terminal conformational change of Bax, the breakdown of the mitochondrial membrane potential, and induction of caspase-9 (LEHD)-like and caspase-3/7 (DEVD)-like activities. In contrast, p14(ARF)-induced apoptosis is markedly attenuated in isogenic HCT116 cells bi-allelically deleted for puma. The sensitivity of Puma-deficient cells to p14(ARF)-induced apoptosis is fully restored by functional reconstitution of Puma using a conditional adenoviral expression vector. Notably, the concomitant deletion of p21(CDKN1) strongly enhances p14(ARF)-induced apoptosis in Puma-proficient cells, but not in isogenic Puma-deficient cells. These results indicate that p14(ARF)-induced mitochondrial apoptosis critically depends on the BH3-only protein Puma. In the presence of a functional p53/Puma/Bax-signaling axis, p14(ARF)-triggered apoptosis is enhanced by loss of p21(CDKN1)-mediated cell cycle checkpoint control.
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Affiliation(s)
- Philipp G Hemmati
- Department of Hematology, Oncology and Tumor Immunology, Charité-Universitätsmedizin Berlin, Campus Berlin-Buch, Berlin, Germany
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9
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Zantl N, Weirich G, Zall H, Seiffert BM, Fischer SF, Kirschnek S, Hartmann C, Fritsch RM, Gillissen B, Daniel PT, Häcker G. Frequent loss of expression of the pro-apoptotic protein Bim in renal cell carcinoma: evidence for contribution to apoptosis resistance. Oncogene 2007; 26:7038-48. [PMID: 17486061 DOI: 10.1038/sj.onc.1210510] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Renal cell carcinoma (RCC) is resistant to chemotherapy, and this resistance is mirrored by a high apoptosis resistance of many RCC lines in vitro. Here, we report the loss of the pro-apoptotic BH3-only protein Bim in a large part of clinical RCC cases and provide evidence for a functional relevance of this loss. Immunohistochemistry of clear cell renal cell carcinoma cases and corresponding normal kidney showed strong Bim reactivity in renal tubules of all cases but loss of Bim in 35 of 45 RCC samples. Out of nine RCC cell lines investigated, six showed strongly diminished or undetectable levels of Bim protein by western blotting. Four RCC lines of varying apoptosis sensitivity were analysed further. Bcl-2, Bcl-x(L), Mcl-1, Bax and Bak expression did not correlate with apoptosis sensitivity. All cell lines underwent apoptosis upon forced expression of Bax and Bim, suggesting an upstream difference. In all four lines, adriamycin induced p53 but not its targets Puma or Noxa. However, apoptosis sensitivity correlated with levels of Bim protein. Bim siRNA reduced apoptosis sensitivity in a susceptible cell line. Furthermore, inhibition of histone deacetylation restored Bim expression in cell lines. These data suggest that Bim has a function as a tumor suppressor in RCC.
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Affiliation(s)
- N Zantl
- Department of Urology, Technical University Munich, Munich, Germany
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10
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Hemmati PG, Güner D, Gillissen B, Wendt J, von Haefen C, Chinnadurai G, Dörken B, Daniel PT. Bak functionally complements for loss of Bax during p14ARF-induced mitochondrial apoptosis in human cancer cells. Oncogene 2006; 25:6582-94. [PMID: 16847458 DOI: 10.1038/sj.onc.1209668] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In contrast to the initial notion that the biological activity of p14(ARF) strictly depends on a functional mdm-2/p53 signaling axis, we recently demonstrated that p14(ARF) mediates apoptosis in a p53/Bax-independent manner. Here, we show that p14(ARF) induces breakdown of the mitochondrial membrane potential and cytochrome c release before triggering caspase-9- and caspase-3/7-like activities in p53/Bax-deficient DU145 prostate cancer cells expressing wild-type Bak. Re-expression of Bax in these cells failed to further enhance p14(ARF)-induced apoptosis, suggesting that p14(ARF)-induced apoptosis primarily depends on Bak but not Bax in these cells. To further define the role of Bak and Bax in p14(ARF)-induced mitochondrial apoptosis, we employed short interference RNA for the knockdown of bak in isogeneic, p53 wild-type HCT116 colon cancer cells either proficient or deficient for Bax. There, combined loss of Bax and Bak attenuated p14(ARF)-induced apoptosis whereas single loss of Bax or Bak was only marginally effective, as in the case of DU145. Notably, HCT116 cells deficient for Bax and Bak failed to release cytochrome c and showed attenuated activation of caspase-9 (LEHDase) and caspase-3/caspase-7 (DEVDase) upon p14(ARF) expression. These data indicate that p14(ARF) triggers apoptosis via a Bax/Bak-dependent pathway in p53-proficient HCT116, whereas Bax is dispensable in p53-deficient DU145 cells. Nevertheless, a substantial proportion of p14(ARF)-induced cell death proceeds in a Bax/Bak-independent manner. This is also the case for inhibition of clonogenic growth that occurs, at least in part, through an entirely Bax/Bak-independent mechanism.
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Affiliation(s)
- P G Hemmati
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Berlin-Buch, Germany
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11
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Sturm I, Stephan C, Gillissen B, Siebert R, Janz M, Radetzki S, Jung K, Loening S, Dörken B, Daniel PT. Loss of the tissue-specific proapoptotic BH3-only protein Nbk/Bik is a unifying feature of renal cell carcinoma. Cell Death Differ 2006; 13:619-27. [PMID: 16322756 DOI: 10.1038/sj.cdd.4401782] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
We report for the first time inactivation of a tissue-specific Bcl-2 homology domain 3 (BH3)-only protein as a common aspect in human cancer. In detail, we show that loss of the BH3-only protein natural born killer (Nbk)/Bcl-2-interacting killer (Bik) is a common feature of clear-cell renal cell carcinoma (RCC). While strong Nbk expression is found in the renal tubuli and the epithelial lining of the glomerula, a consistent loss of Nbk expression was observed in primary RCC tissue and RCC cell lines. Mutation of Nbk is, however, rare, whereas deletion of the Nbk gene at 22q13.2 is frequent. In addition to loss of heterozygosity (LOH), DNA methylation mediates transcriptional silencing of the Nbk gene. The conditional restoration of Nbk/Bik expression led to apoptotic death of RCC but not of nonmalignant renal epithelia. A broader expression analysis of RCC cell lines for BH3-only proteins revealed that loss of Nbk coincides with failure to express Bim, whereas Puma, Bid and BNIP3 are readily detectable and, in case of Puma, inducible by p53. These data delineate a role for defects in BH3-only proteins as tumor suppressors in RCC and may explain at the same time the impressive clinical apoptosis resistance of RCC.
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Affiliation(s)
- I Sturm
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Campus Berlin-Buch, Berlin, Germany
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12
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Bhonde MR, Hanski ML, Budczies J, Cao M, Gillissen B, Moorthy D, Simonetta F, Scherübl H, Truss M, Hagemeier C, Mewes HW, Daniel PT, Zeitz M, Hanski C. DNA Damage-induced Expression of p53 Suppresses Mitotic Checkpoint Kinase hMps1. J Biol Chem 2006; 281:8675-85. [PMID: 16446370 DOI: 10.1074/jbc.m511333200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
DNA damage induced by the topoisomerase I inhibitor irinotecan (CPT-11) triggers in p53(WT) colorectal carcinoma cells a long term cell cycle arrest and in p53MUT cells a transient arrest followed by apoptosis (Magrini, R., Bhonde, M. R., Hanski, M. L., Notter, M., Scherübl, H., Boland, C. R., Zeitz, M., and Hanski, C. (2002) Int. J. Cancer 101, 23-31; Bhonde, M. R., Hanski, M. L., Notter, M., Gillissen, B. F., Daniel, P. T., Zeitz, M., and Hanski, C. (2006) Oncogene 25, 165-175). The mechanism of the p53-independent apoptosis still remains largely unclear. Here we used five p53WT and five p53MUT established colon carcinoma cell lines to identify gene expression alterations associated with apoptosis in p53MUT cells after treatment with SN-38, the irinotecan metabolite. After treatment, 16 mitosis-related genes were found to be expressed at least 2-fold stronger in the apoptosis-executing p53MUT cells than in the cell cycle-arrested p53WT cells by oligonucleotide microarray analysis. One of the genes whose strong post-treatment expression was associated with apoptosis was the mitotic checkpoint kinase hMps1 (human ortholog of the yeast monopolar spindle 1 kinase). hMps1 mRNA and protein expression were suppressed by the treatment-induced and by the exogenous adenovirus-coded p53 protein. The direct suppression of hMps1 on RNA level or inhibition of its activity by a dominant-negative hMps1 partly suppressed apoptosis. Together, these data indicate that the high expression of mitotic genes in p53MUT cells after SN-38 treatment contributes to DNA damage-induced apoptosis, whereas their suppression in p53WT cells acts as a safeguard mechanism preventing mitosis initiation and the subsequent apoptosis. hMps1 kinase is one of the mitotic checkpoint proteins whose expression after DNA damage in p53MUT cells activates the checkpoint and contributes to apoptosis.
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Affiliation(s)
- Mandar R Bhonde
- Department of Gastroenterology, University Medical Center Charité, Campus Benjamin Franklin, 12200 Berlin, Germany
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13
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Naumann U, Schmidt F, Wick W, Frank B, Weit S, Gillissen B, Daniel P, Weller M. Adenoviral natural born killer gene therapy for malignant glioma. Hum Gene Ther 2003; 14:1235-46. [PMID: 12952595 DOI: 10.1089/104303403767740777] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Glioblastoma is a lethal neoplasm resistant to conventional radiotherapy and chemotherapy. Natural born killer (NBK), also known as Bcl-2-interacting killer (BIK), is a death-promoting Bcl-2 family protein sharing with Bcl-2 only the Bcl homology 3 (BH3) domain. We here report that an adenoviral vector encoding NBK (Ad-NBK) uniformly induces cell death in 12 human malignant glioma cell lines. Ad-NBK-induced cell death involves neither quantitative mitochondrial cytochrome c release nor caspase 8, 9, 7, or 3 processing and is unaffected by the viral caspase inhibitor, cytokine response modifier A (CRM-A), or selective caspase 8 or 9 inhibitors. In contrast, Ad-NBK-induced cell death is inhibited by the broad-range caspase inhibitor, zVAD-fmk, or by adenoviral gene transfer of the X-linked inhibitor of apoptosis protein (XIAP). Further, Ad-NBK-induced cell death is inhibited by Bcl-2 or Bcl-xL gene transfer. Interestingly, Bcl-2- and Bcl-xL-transfected glioma cells, which are partially protected from Ad-NBK-induced cell death, accumulate much higher levels of NBK than are ever observed in control-infected cells. This indicates that complex formation with Bcl-2 or Bcl-xL sequesters NBK in an inactive form and that free NBK, rather than an NBK-mediated depletion of free antiapoptotic Bcl-2 family proteins, is the proximate mediator of Ad-NBK-induced cell death. Conversely, proteasome inhibition-mediated accumulation of NBK strongly enhances Ad-NBK-induced cell death. Finally, Ad-NBK-infected LN-229 glioma cells are not tumorigenic in nude mice. Thus Ad-NBK triggers an XIAP- and zVAD-fmk-sensitive cell death pathway in glioma cells with potential therapeutic value, provided that NBK expression can be selectively targeted to cancer cells.
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Affiliation(s)
- Ulrike Naumann
- Laboratory of Molecular Neuro-Oncology, Department of Neurology, University of Tübingen, School of Medicine, D-72076 Tübingen, Germany.
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14
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Bürkle L, Cedzich A, Döpke C, Stransky H, Okumoto S, Gillissen B, Kühn C, Frommer WB. Transport of cytokinins mediated by purine transporters of the PUP family expressed in phloem, hydathodes, and pollen of Arabidopsis. Plant J 2003; 34:13-26. [PMID: 12662305 DOI: 10.1046/j.1365-313x.2003.01700.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Nucleobases and derivatives like cytokinins and caffeine are translocated in the plant vascular system. Transport studies in cultured Arabidopsis cells indicate that adenine and cytokinin are transported by a common H+-coupled high-affinity purine transport system. Transport properties are similar to that of Arabidopsis purine transporters AtPUP1 and 2. When expressed in yeast, AtPUP1 and 2 mediate energy-dependent high-affinity adenine uptake, whereas AtPUP3 activity was not detectable. Similar to the results from cell cultures, purine permeases (PUP) mediated uptake of adenine can be inhibited by cytokinins, indicating that cytokinins are transport substrates. Direct measurements demonstrate that AtPUP1 is capable of mediating uptake of radiolabeled trans-zeatin. Cytokinin uptake is strongly inhibited by adenine and isopentenyladenine but is poorly inhibited by 6-chloropurine. A number of physiological cytokinins including trans- and cis-zeatin are also efficient competitors for AtPUP2-mediated adenine uptake, suggesting that AtPUP2 is also able to mediate cytokinin transport. Furthermore, AtPUP1 mediates transport of caffeine and ribosylated purine derivatives in yeast. Promoter-reporter gene studies point towards AtPUP1 expression in the epithem of hydathodes and the stigma surface of siliques, suggesting a role in retrieval of cytokinins from xylem sap to prevent loss during guttation. The AtPUP2 promoter drives GUS reporter gene activity in the phloem of Arabidopsis leaves, indicating a role in long-distance transport of adenine and cytokinins. Promoter activity of AtPUP3 was only found in pollen. In summary, three closely related PUPs are differentially expressed in Arabidopsis and at least two PUPs have properties similar to the adenine and cytokinin transport system identified in Arabidopsis cell cultures.
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Affiliation(s)
- Lukas Bürkle
- Plant Physiology, Zentrum für Molekularbiologie der Pflanzen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany
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15
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von Haefen C, Wieder T, Gillissen B, Stärck L, Graupner V, Dörken B, Daniel PT. Ceramide induces mitochondrial activation and apoptosis via a Bax-dependent pathway in human carcinoma cells. Oncogene 2002; 21:4009-19. [PMID: 12037683 DOI: 10.1038/sj.onc.1205497] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2001] [Revised: 03/06/2002] [Accepted: 03/18/2002] [Indexed: 12/26/2022]
Abstract
The intracellular pathways leading to mitochondrial activation and subsequent cell death in the ceramide-mediated stress response have been intensively studied in recent years. Experimental evidence has been provided that ceramide-induced apoptosis is inhibited by overexpression of antiapoptotic proteins of the Bcl-2 family. However, the direct effect of proapoptotic gene products, e.g. Bax, on ceramide-induced death signalling has not yet been studied in detail. In the present work, we show by measurement of mitochondrial permeability transition, cytochrome c release, activation of caspase-3 and DNA fragmentation that ceramide-induced apoptosis is marginal in Bax-negative DU 145 cells. Reconstitution of Bax by generation of DU 145 cells stably expressing this proapoptotic factor, clearly enhanced ceramide-induced apoptosis at all levels of the mitochondrial signalling cascade. Using the broad-range caspase inhibitor zVAD-fmk and zDEVD-fmk, an inhibitor of caspase-3-like activities, we demonstrate that the ceramide-induced mitochondrial activation in Bax-transfected DU 145 cells is caspase-independent. On the other hand, apoptotic events located downstream of the mitochondria, e.g. DNA fragmentation, were shown to be caspase-dependent. This influence of Bax on ceramide-induced apoptosis was confirmed in another cellular system: whereas Bax-positive HCT116 wild type cells were very sensitive towards induction of cell death by C(2)-ceramide, sensitivity of Bax knock-out HCT116 cells was significantly reduced. Thus, we conclude that Bax is a key activator of ceramide-mediated death pathways.
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Affiliation(s)
- Clarissa von Haefen
- Department of Hematology, Oncology and Tumor Immunology, University Medical Center Charité, Humboldt University of Berlin, 13125, Germany
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16
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Gillissen B, Bürkle L, André B, Kühn C, Rentsch D, Brandl B, Frommer WB. A new family of high-affinity transporters for adenine, cytosine, and purine derivatives in Arabidopsis. Plant Cell 2000. [PMID: 10662864 DOI: 10.2307/3870929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In many organisms, including plants, nucleic acid bases and derivatives such as caffeine are transported across the plasma membrane. Cytokinins, important hormones structurally related to adenine, are produced mainly in root apices, from where they are translocated to shoots to control a multitude of physiological processes. Complementation of a yeast mutant deficient in adenine uptake (fcy2) with an Arabidopsis cDNA expression library enabled the identification of a gene, AtPUP1 (for Arabidopsis thaliana purine permease1), belonging to a large gene family (AtPUP1 to AtPUP15) encoding a new class of small, integral membrane proteins. AtPUP1 transports adenine and cytosine with high affinity. Uptake is energy dependent, occurs against a concentration gradient, and is sensitive to protonophores, potentially indicating secondary active transport. Competition studies show that purine derivatives (e.g., hypoxanthine), phytohormones (e.g., zeatin and kinetin), and alkaloids (e.g., caffeine) are potent inhibitors of adenine and cytosine uptake. Inhibition by cytokinins is competitive (competitive inhibition constant K(i) = 20 to 35 microM), indicating that cytokinins are transported by this system. AtPUP1 is expressed in all organs except roots, indicating that the gene encodes an uptake system for root-derived nucleic acid base derivatives in shoots or that it exports nucleic acid base analogs from shoots by way of the phloem. The other family members may have different affinities for nucleic acid bases, perhaps functioning as transporters for nucleosides, nucleotides, and their derivatives.
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Affiliation(s)
- B Gillissen
- Plant Physiology, Zentrum für Molekularbiologie der Pflanzen (ZMBP), Auf der Morgenstelle 1, D-72076 Tübingen, Germany
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17
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Gillissen B, Bürkle L, André B, Kühn C, Rentsch D, Brandl B, Frommer WB. A new family of high-affinity transporters for adenine, cytosine, and purine derivatives in Arabidopsis. Plant Cell 2000; 12:291-300. [PMID: 10662864 PMCID: PMC139765 DOI: 10.1105/tpc.12.2.291] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/1999] [Accepted: 11/20/1999] [Indexed: 05/17/2023]
Abstract
In many organisms, including plants, nucleic acid bases and derivatives such as caffeine are transported across the plasma membrane. Cytokinins, important hormones structurally related to adenine, are produced mainly in root apices, from where they are translocated to shoots to control a multitude of physiological processes. Complementation of a yeast mutant deficient in adenine uptake (fcy2) with an Arabidopsis cDNA expression library enabled the identification of a gene, AtPUP1 (for Arabidopsis thaliana purine permease1), belonging to a large gene family (AtPUP1 to AtPUP15) encoding a new class of small, integral membrane proteins. AtPUP1 transports adenine and cytosine with high affinity. Uptake is energy dependent, occurs against a concentration gradient, and is sensitive to protonophores, potentially indicating secondary active transport. Competition studies show that purine derivatives (e.g., hypoxanthine), phytohormones (e.g., zeatin and kinetin), and alkaloids (e.g., caffeine) are potent inhibitors of adenine and cytosine uptake. Inhibition by cytokinins is competitive (competitive inhibition constant K(i) = 20 to 35 microM), indicating that cytokinins are transported by this system. AtPUP1 is expressed in all organs except roots, indicating that the gene encodes an uptake system for root-derived nucleic acid base derivatives in shoots or that it exports nucleic acid base analogs from shoots by way of the phloem. The other family members may have different affinities for nucleic acid bases, perhaps functioning as transporters for nucleosides, nucleotides, and their derivatives.
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Affiliation(s)
- B Gillissen
- Plant Physiology, Zentrum für Molekularbiologie der Pflanzen (ZMBP), Auf der Morgenstelle 1, D-72076 Tübingen, Germany
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18
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von Wirén N, Lauter FR, Ninnemann O, Gillissen B, Walch-Liu P, Engels C, Jost W, Frommer WB. Differential regulation of three functional ammonium transporter genes by nitrogen in root hairs and by light in leaves of tomato. Plant J 2000; 21:167-75. [PMID: 10743657 DOI: 10.1046/j.1365-313x.2000.00665.x] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
To elucidate the role of NH4+ transporters in N nutrition of tomato, two new NH4+ transporter genes were isolated from cDNA libraries of root hairs or leaves of tomato. While LeAMT1;2 is closely related to LeAMT1;1 (75.6% amino acid identity), LeAMT1;3 is more distantly related (62.8% identity) and possesses two short upstream open reading frames in the 5' end of the mRNA and a particularly short N-terminus of the protein as unique features. When expressed in yeast mutants defective in NH4+ uptake, all three genes complemented NH4+ uptake. In roots of hydroponically grown plants, transcript levels of LeAMT1;2 increased after NH4+ or NO3- supply, while LeAMT1;1 was induced by N deficiency coinciding with low glutamine concentrations, and LeAMT1;3 was not detected. In aeroponic culture, expression of LeAMT1;1 and LeAMT1;2 was higher in root hairs than in the remaining root fraction. Growth of plants at elevated CO2 slightly decreased expression of LeAMT1;2 and LeAMT1;3 in leaves, but strongly repressed transcript levels of chloroplast glutamine synthetase and photorespiratory serine hydroxymethyl-transferase. Expression of LeAMT1;2 and LeAMT1;3 showed a reciprocal diurnal regulation with highest transcript levels of LeAMT1;3 in darkness and highest levels of LeAMT1;2 after onset of light. These results indicate that in tomato at least two high-affinity NH4+ transporters, LeAMT1;1 and LeAMT1;2, are differentially regulated by N and contribute to root hair-mediated NH4+ acquisition from the rhizosphere. In leaves, the reciprocally expressed transporters LeAMT1;2 and LeAMT1;3 are supposed to play different roles in N metabolism, NH4+ uptake and/or NH3 retrieval during photorespiration.
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Affiliation(s)
- N von Wirén
- Zentrum für Molekularbiologie der Pflanzen Tübingen (ZMBP), Tübingen
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Ludewig F, Sonnewald U, Kauder F, Heineke D, Geiger M, Stitt M, Müller-Röber BT, Gillissen B, Kühn C, Frommer WB. The role of transient starch in acclimation to elevated atmospheric CO2. FEBS Lett 1998; 429:147-51. [PMID: 9650579 DOI: 10.1016/s0014-5793(98)00580-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Although increased concentrations of CO2 stimulate photosynthesis, this stimulation is often lost during prolonged exposure to elevated carbon dioxide, leading to an attenuation of the potential gain in yield. Under these conditions, a wide variety of species accumulates non-structural carbohydrates in leaves. It has been proposed that starch accumulation directly inhibits photosynthesis, that the rate of sucrose and starch synthesis limits photosynthesis, or that accumulation of sugars triggers changes in gene expression resulting in lower activities of Rubisco and inhibition of photosynthesis. To distinguish these explanations, transgenic plants unable to accumulate transient starch due to leaf mesophyll-specific antisense expression of AGP B were grown at ambient and elevated carbon dioxide. There was a positive correlation between the capacity for starch synthesis and the rate of photosynthesis at elevated CO2 concentrations, showing that the capability to synthesize leaf starch is essential for photosynthesis in elevated carbon dioxide. The results show that in elevated carbon dioxide, photosynthesis is restricted by the rate of end product synthesis. Accumulation of starch is not responsible for inhibition of photosynthesis. Although transgenic plants contained increased levels of hexoses, transcripts of photosynthetic genes were not downregulated and Rubisco activity was not decreased arguing against a role of sugar sensing in acclimation to high CO2.
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Affiliation(s)
- F Ludewig
- Institut für Pflanzengenetik und Kulturpflanzenforschung, Gatersleben, Germany
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Abstract
In U. maydis the multiallelic b locus controls sexual and pathogenic development. In the b locus a gene coding for a regulatory protein had been identified, and it was suggested that the interaction of two b polypeptides specified by different alleles programs sexual development in this fungus. We now demonstrate the existence of a second regulatory gene in the b locus. We term this gene bW and refer to the former as the bE gene. Both genes exist in many alleles. Although unrelated in primary sequence, both genes are similar in their overall organization. The gene products display allele-specific variability in their N-terminal domains, show a high degree of sequence conservation in the C-terminal domains, and contain a homeodomain-related motif. Genetic evidence is provided to show that the pair of bE and bW polypeptides encoded by different b alleles is the key regulatory species.
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Affiliation(s)
- B Gillissen
- Institut für Genbiologische Forschung Berlin GmbH, Federal Republic of Germany
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