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Subtil FSB, Gröbner C, Recknagel N, Parplys AC, Kohl S, Arenz A, Eberle F, Dikomey E, Engenhart-Cabillic R, Schötz U. Dual PI3K/mTOR Inhibitor NVP-BEZ235 Leads to a Synergistic Enhancement of Cisplatin and Radiation in Both HPV-Negative and -Positive HNSCC Cell Lines. Cancers (Basel) 2022; 14:cancers14133160. [PMID: 35804930 PMCID: PMC9265133 DOI: 10.3390/cancers14133160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/13/2022] [Revised: 06/23/2022] [Accepted: 06/24/2022] [Indexed: 12/10/2022] Open
Abstract
Simple Summary Head and neck cancers (HNSCCs), especially in the advanced stages, are predominantly treated by radiochemotherapy, including cisplatin. The cure rates are clearly higher for HPV-positive HNSCCs when compared to HPV-negative HNSCCs. For both entities, this treatment is accompanied by serious adverse reactions, mainly due to cisplatin administration. We reported earlier that for both HPV-positive and negative HNSCC cells, the effect of radiotherapy was strongly enhanced when pretreated using the dual PI3K/mTOR inhibitor NVP-BEZ235 (BEZ235). The current study shows that for HPV-positive cells, BEZ235 will strongly enhance the effect of cisplatin alone. More important, preincubation with BEZ235 was found to alter the purely additive effect normally seen when cisplatin is combined with radiation into a strong synergistic enhancement. This tri-modal combination might allow for the enhancement of the effect of radiochemotherapy, even with reduced cisplatin. Abstract The standard of care for advanced head and neck cancers (HNSCCs) is radiochemotherapy, including cisplatin. This treatment results in a cure rate of approximately 85% for oropharyngeal HPV-positive HNSCCs, in contrast to only 50% for HPV-negative HNSCCs, and is accompanied by severe side effects for both entities. Therefore, innovative treatment modalities are required, resulting in a better outcome for HPV-negative HNSCCs, and lowering the adverse effects for both entities. The effect of the dual PI3K/mTOR inhibitor NVP-BEZ235 on a combined treatment with cisplatin and radiation was studied in six HPV-negative and six HPV-positive HNSCC cell lines. Cisplatin alone was slightly more effective in HPV-positive cells. This could be attributed to a defect in homologous recombination, as demonstrated by depleting RAD51. Solely for HPV-positive cells, pretreatment with BEZ235 resulted in enhanced cisplatin sensitivity. For the combination of cisplatin and radiation, additive effects were observed. However, when pretreated with BEZ235, this combination changed into a synergistic interaction, with a slightly stronger enhancement for HPV-positive cells. This increase could be attributed to a diminished degree of DSB repair in G1, as visualized via the detection of γH2AX/53BP1 foci. BEZ235 can be used to enhance the effect of combined treatment with cisplatin and radiation in both HPV-negative and -positive HNSCCs.
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Affiliation(s)
- Florentine S. B. Subtil
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Carolin Gröbner
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Niklas Recknagel
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Ann Christin Parplys
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Sibylla Kohl
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Andrea Arenz
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Fabian Eberle
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Ekkehard Dikomey
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
- Laboratory of Radiobiology & Experimental Radiooncology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Rita Engenhart-Cabillic
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
| | - Ulrike Schötz
- Department of Radiotherapy and Radiooncology, Philipps-University, 35043 Marburg, Germany; (F.S.B.S.); (C.G.); (N.R.); (A.C.P.); (S.K.); (A.A.); (F.E.); (E.D.); (R.E.-C.)
- Correspondence: ; Tel.: +49-6421-28-21978
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2
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de Buhr N, Parplys AC, Schroeder M, Henneck T, Schaumburg B, Stanelle-Bertram S, Jarczak D, Nierhaus A, Hiller J, Peine S, Kluge S, Klingel K, Gabriel G, von Köckritz-Blickwede M. Impaired Degradation of Neutrophil Extracellular Traps: A Possible Severity Factor of Elderly Male COVID-19 Patients. J Innate Immun 2022; 14:461-476. [PMID: 35086104 PMCID: PMC9059026 DOI: 10.1159/000521594] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 08/06/2021] [Accepted: 12/09/2021] [Indexed: 12/03/2022] Open
Abstract
Neutrophil extracellular traps (NETs) have been described as a potential trigger of severe COVID-19. NETs are known as extracellular DNA fibers released by neutrophils in response to infection. If the host is unable to balance efficient clearance of NETs by dornases (DNases), detrimental consequences occur. Elevated levels of NETs in COVID-19 patients are associated with higher risk of morbid thrombotic complications. Here, we studied the level of NET markers and DNase activity in a cohort of COVID-19 patients compared to healthy controls. Our data confirmed an increased level of NET markers in the plasma of COVID-19 patients, with a higher level in male compared to female patients. At the same time, there was an increased DNase activity detectable in COVID-19 patients compared to healthy controls. Importantly, there was a negative correlation of DNase activity with the age of male patients. The antimicrobial peptide LL-37, which is known to stabilize NETs against DNase degradation, is embedded in NETs upon severe acute respiratory syndrome coronavirus-2-infection. The LL-37 plasma level correlates with the NET-marker level in male COVID-19 patients, indicating a potential role of LL-37 in the risk of NET-associated thrombosis in male COVID-19 patients by stabilizing NETs against DNase degradation. In conclusion, our data identify two potential risk factors of elderly male patients which may lead to inefficient NET degradation and a subsequently higher risk of NET-associated thrombosis during COVID-19: reduced DNase activity and an increased LL-37 level.
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Affiliation(s)
- Nicole de Buhr
- Department of Biochemistry, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.,Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | | | - Maria Schroeder
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Timo Henneck
- Department of Biochemistry, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.,Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | | | | | - Dominik Jarczak
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Axel Nierhaus
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Jens Hiller
- Institute for Transfusion Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Sven Peine
- Institute for Transfusion Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Stefan Kluge
- Department of Intensive Care Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Karin Klingel
- Institute for Pathology and Neuropathology, University Hospital Tuebingen, Tuebingen, Germany
| | - Gülsah Gabriel
- Leibniz Institute for Experimental Virology, Hamburg, Germany.,Institute for Virology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
| | - Maren von Köckritz-Blickwede
- Department of Biochemistry, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany.,Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
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3
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Struve N, Hoffer K, Weik AS, Riepen B, Krug L, Cetin MH, Burmester J, Ott L, Liebing J, Gatzemeier F, Müller-Goebel J, Gerbach M, Bußmann L, Parplys AC, Unger K, Mansour WY, Schüller U, Rieckmann T, Petersen C, Rothkamm K, Short SC, Kriegs M. Increased replication stress and R-loop accumulation in EGFRvIII-expressing glioblastoma present new therapeutic opportunities. Neurooncol Adv 2022; 4:vdab180. [PMID: 35274102 PMCID: PMC8903237 DOI: 10.1093/noajnl/vdab180] [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] [Indexed: 11/16/2022] Open
Abstract
Background The oncogene epidermal growth factor receptor variant III (EGFRvIII) is expressed in approximately one-third of all glioblastomas (GBMs). So far it is not clear if EGFRvIII expression induces replication stress in GBM cells, which might serve as a therapeutical target. Methods Isogenetic EGFRvIII− and EGFRvIII+ cell lines with endogenous EGFRvIII expression were used. Markers of oncogenic and replication stress such as γH2AX, RPA, 53BP1, ATR, and CHK1 were analyzed using western blot, immunofluorescence, and flow cytometry. The DNA fiber assay was performed to analyze replication, transcription was measured by incorporation of EU, and genomic instability was investigated by micronuclei and CGH-Array analysis. Immunohistochemistry staining was used to detect replication stress markers and R-loops in human GBM samples. Results EGFRvIII+ cells exhibit an activated replication stress response, increased spontaneous DNA damage, elevated levels of single-stranded DNA, and reduced DNA replication velocity, which are all indicative characteristics of replication stress. Furthermore, we show here that EGFRvIII expression is linked to increased genomic instability. EGFRvIII-expressing cells display elevated RNA synthesis and R-loop formation, which could also be confirmed in EGFRvIII-positive GBM patient samples. Targeting replication stress by irinotecan resulted in increased sensitivity of EGFRvIII+ cells. Conclusion This study demonstrates that EGFRvIII expression is associated with increased replication stress, R-loop accumulation, and genomic instability. This might contribute to intratumoral heterogeneity but may also be exploited for individualized therapy approaches.
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Affiliation(s)
- Nina Struve
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Mildred-Scheel Cancer Career Center HATRICs4, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Konstantin Hoffer
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anna-Sophie Weik
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Britta Riepen
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Leonie Krug
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Meryem H Cetin
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jasmin Burmester
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Leonie Ott
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jana Liebing
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Fruzsina Gatzemeier
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Justus Müller-Goebel
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Mirja Gerbach
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Lara Bußmann
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Mildred-Scheel Cancer Career Center HATRICs4, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Otolaryngology and Head and Neck Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Laboratory of Radiobiology & Experimental Radiation, Germany
| | - Ann Christin Parplys
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Radiotherapy and Radiooncology, Philipps University, Marburg, Germany
| | - Kristian Unger
- Research Unit Radiation Cytogenetics, Helmholtz Zentrum München, Oberschleibheim, Germany
| | - Wael Y Mansour
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Mildred-Scheel Cancer Career Center HATRICs4, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ulrich Schüller
- Institute of Neuropathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Research Institute Children's Cancer Center Hamburg, Hamburg, Germany
| | - Thorsten Rieckmann
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Otolaryngology and Head and Neck Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Laboratory of Radiobiology & Experimental Radiation, Germany
| | - Cordula Petersen
- Department of Radiotherapy and Radiation Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kai Rothkamm
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Susan C Short
- Leeds Institute of Cancer and Pathology, St James's University Hospital, UK
| | - Malte Kriegs
- Department of Radiotherapy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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4
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Rieckhoff J, Meyer F, Classen S, Zielinski A, Riepen B, Wikman H, Petersen C, Rothkamm K, Borgmann K, Parplys AC. Exploiting Chromosomal Instability of PTEN-Deficient Triple-Negative Breast Cancer Cell Lines for the Sensitization against PARP1 Inhibition in a Replication-Dependent Manner. Cancers (Basel) 2020; 12:cancers12102809. [PMID: 33003585 PMCID: PMC7601067 DOI: 10.3390/cancers12102809] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 07/16/2020] [Revised: 09/11/2020] [Accepted: 09/25/2020] [Indexed: 12/16/2022] Open
Abstract
Simple Summary The poor prognosis of patients with TNBC have fostered a major effort to identify more patients who would benefit from targeted therapies. Here we recognize PTEN as a potential CIN-causing gene in TNBC and consider PTEN-deficient TNBC for the treatment with PARP1 inhibitors due to the protective role of PTEN during DNA replication. Abstract Chromosomal instability (CIN) is an emerging hallmark of cancer and its role in therapeutic responses has been increasingly attracting the attention of the research community. To target the vulnerability of tumors with high CIN, it is important to identify the genes and mechanisms involved in the maintenance of CIN. In our work, we recognize the tumor suppressor gene Phosphatase and Tensin homolog (PTEN) as a potential gene causing CIN in triple-negative breast cancer (TNBC) and show that TNBC with low expression levels of PTEN can be sensitized for the treatment with poly-(ADP-ribose)-polymerase 1 (PARP1) inhibitors, independent of Breast Cancer (BRCA) mutations or a BRCA-like phenotype. In silico analysis of mRNA expression data from 200 TNBC patients revealed low expression of PTEN in tumors with a high CIN70 score. Western blot analysis of TNBC cell lines confirm lower protein expression of PTEN compared to non TNBC cell lines. Further, PTEN-deficient cell lines showed cellular sensitivity towards PARP1 inhibition treatment. DNA fiber assays and examination of chromatin bound protein fractions indicate a protective role of PTEN at stalled replication forks. In this study, we recognize PTEN as a potential CIN-causing gene in TNBC and identify its important role in the replication processes.
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Affiliation(s)
- Johanna Rieckhoff
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Felix Meyer
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Sandra Classen
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Alexandra Zielinski
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Britta Riepen
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Harriet Wikman
- Department of Tumor Biology, Center of Experimental Medicine, University Medical Center, Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Cordula Petersen
- Department of Radiotherapy and Radio Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Kai Rothkamm
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Kerstin Borgmann
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
| | - Ann Christin Parplys
- Laboratory of Radiobiology & Experimental Radio Oncology, Centre of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (J.R.); (F.M.); (S.C.); (A.Z.); (B.R.); (K.R.); (K.B.)
- Correspondence:
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5
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Meyer F, Becker S, Classen S, Parplys AC, Mansour WY, Riepen B, Timm S, Ruebe C, Jasin M, Wikman H, Petersen C, Rothkamm K, Borgmann K. Prevention of DNA Replication Stress by CHK1 Leads to Chemoresistance Despite a DNA Repair Defect in Homologous Recombination in Breast Cancer. Cells 2020; 9:cells9010238. [PMID: 31963582 PMCID: PMC7017274 DOI: 10.3390/cells9010238] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 01/03/2020] [Accepted: 01/14/2020] [Indexed: 01/20/2023] Open
Abstract
Chromosomal instability not only has a negative effect on survival in triple-negative breast cancer, but also on the well treatable subgroup of luminal A tumors. This suggests a general mechanism independent of subtypes. Increased chromosomal instability (CIN) in triple-negative breast cancer (TNBC) is attributed to a defect in the DNA repair pathway homologous recombination. Homologous recombination (HR) prevents genomic instability by repair and protection of replication. It is unclear whether genetic alterations actually lead to a repair defect or whether superior signaling pathways are of greater importance. Previous studies focused exclusively on the repair function of HR. Here, we show that the regulation of HR by the intra-S-phase damage response at the replication is of overriding importance. A damage response activated by Ataxia telangiectasia and Rad3 related-checkpoint kinase 1 (ATR-CHK1) can prevent replication stress and leads to resistance formation. CHK1 thus has a preferred role over HR in preventing replication stress in TNBC. The signaling cascade ATR-CHK1 can compensate for a double-strand break repair error and lead to resistance of HR-deficient tumors. Established methods for the identification of HR-deficient tumors for Poly(ADP-Ribose)-Polymerase 1 (PARP1) inhibitor therapies should be extended to include analysis of candidates for intra-S phase damage response.
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Affiliation(s)
- Felix Meyer
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Saskia Becker
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Sandra Classen
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Ann Christin Parplys
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Wael Yassin Mansour
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
- Tumor Biology Department, National Cancer Institute, Cairo University, Cairo 11796, Egypt
| | - Britta Riepen
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Sara Timm
- Department of Radiation Oncology, Saarland University, 66421 Hamburg/Saar, Germany; (S.T.); (C.R.)
| | - Claudia Ruebe
- Department of Radiation Oncology, Saarland University, 66421 Hamburg/Saar, Germany; (S.T.); (C.R.)
| | - Maria Jasin
- Developmental Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA;
| | - Harriet Wikman
- Department of Tumor Biology, University Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Cordula Petersen
- Department of Radiotherapy and Radiooncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Kai Rothkamm
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
| | - Kerstin Borgmann
- Laboratory of Radiobiology and Experimental Radiooncology, Center of Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (F.M.); (S.B.); (S.C.); (A.C.P.); (W.Y.M.); (B.R.); (K.R.)
- Correspondence: ; Tel.: +49-40-74105-3596
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6
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Bose M, Sachsenweger J, Laurila N, Parplys AC, Willmann J, Jungwirth J, Groth M, Rapakko K, Nieminen P, Friedl TWP, Heiserich L, Meyer F, Tuppurainen H, Peltoketo H, Nevanlinna H, Pylkäs K, Borgmann K, Wiesmüller L, Winqvist R, Pospiech H. BRCA1 mislocalization leads to aberrant DNA damage response in heterozygous ABRAXAS1 mutation carrier cells. Hum Mol Genet 2019; 28:4148-4160. [PMID: 31630195 DOI: 10.1093/hmg/ddz252] [Citation(s) in RCA: 2] [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: 05/07/2019] [Revised: 08/31/2019] [Accepted: 09/02/2019] [Indexed: 11/14/2022] Open
Abstract
Whilst heterozygous germline mutations in the ABRAXAS1 gene have been associated with a hereditary predisposition to breast cancer, their effect on promoting tumourigenesis at the cellular level has not been explored. Here, we demonstrate in patient-derived cells that the Finnish ABRAXAS1 founder mutation (c.1082G > A, Arg361Gln), even in the heterozygous state leads to decreased BRCA1 protein levels as well as reduced nuclear localization and foci formation of BRCA1 and CtIP. This causes disturbances in basal BRCA1-A complex localization, which is reflected by a restraint in error-prone DNA double-strand break repair pathway usage, attenuated DNA damage response and deregulated G2-M checkpoint control. The current study clearly demonstrates how the Finnish ABRAXAS1 founder mutation acts in a dominant-negative manner on BRCA1 to promote genome destabilization in heterozygous carrier cells.
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Affiliation(s)
- Muthiah Bose
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Juliane Sachsenweger
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland.,Department of Obstetrics and Gynecology, Ulm University, 89075 Ulm, Germany
| | - Niina Laurila
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Ann Christin Parplys
- Laboratory of Radiobiology and Experimental Radiooncology, University Cancer Center Hamburg (UCCH), University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Jonas Willmann
- Laboratory of Radiobiology and Experimental Radiooncology, University Cancer Center Hamburg (UCCH), University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Johannes Jungwirth
- Project group Biochemistry, Leibniz Institute on Aging - Fritz Lipmann Institute, 07745 Jena, Germany
| | - Marco Groth
- Core Facility DNA Sequencing, Leibniz Institute on Aging-Fritz Lipmann Institute, 07745 Jena, Germany
| | - Katrin Rapakko
- Laboratory of Genetics, Northern Finland Laboratory Centre NordLab Oulu, 90220 Oulu, Finland
| | - Pentti Nieminen
- Department of Medical Informatics and Statistics, University of Oulu, 90220 Oulu, Finland
| | - Thomas W P Friedl
- Department of Obstetrics and Gynecology, Ulm University, 89075 Ulm, Germany
| | | | - Felix Meyer
- Laboratory of Radiobiology and Experimental Radiooncology, University Cancer Center Hamburg (UCCH), University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Hanna Tuppurainen
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Hellevi Peltoketo
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Heli Nevanlinna
- Department of Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, Biomedicum Helsinki, 00029 Helsinki, Finland
| | - Katri Pylkäs
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Kerstin Borgmann
- Laboratory of Radiobiology and Experimental Radiooncology, University Cancer Center Hamburg (UCCH), University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Lisa Wiesmüller
- Department of Obstetrics and Gynecology, Ulm University, 89075 Ulm, Germany
| | - Robert Winqvist
- Laboratory of Cancer Genetics and Tumor Biology, Cancer and Translational Medicine Research Unit, Biocenter Oulu, University of Oulu and NordLab Oulu, 90220 Oulu, Finland
| | - Helmut Pospiech
- Project group Biochemistry, Leibniz Institute on Aging - Fritz Lipmann Institute, 07745 Jena, Germany.,Faculty of Biochemistry and Molecular Medicine, University of Oulu, 90220 Oulu, Finland
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7
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Struve N, Binder ZA, Stead LF, Brend T, Bagley SJ, Faulkner C, Ott L, Müller-Goebel J, Weik AS, Hoffer K, Rieckmann T, Christin Parplys A, Burmester J, Henze M, Morrissette JJD, Schüller U, Petersen C, Rothkamm K, Kurian KM, Short SC, Kriegs M. CBMT-16. EGFRvIII EXPRESSION CONFERS CHEMOSENSITIVITY BY INCREASING DNA MISMATCH REPAIR PROTEIN EXPRESSION AND REPLICATION STRESS. Neuro Oncol 2019. [DOI: 10.1093/neuonc/noz175.138] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
MGMT promoter methylation is the only accepted biomarker with prognostic role in GBM but its routine implementation is limited partly response to TMZ is heterogeneous, but also due to lack of effective alternative treatment options. Therefore, additional biomarkers are needed to enable better prediction of survival and to improve individualized treatment of GBM patients. A potential new biomarker is the epidermal growth factor receptor variant III (EGFRvIII). This constitutively activated deletion variant is present in approximately one third of all IDH wildtype GBM, but its relevance to treatment response is poorly understood. The aim of the present study was to analyze the impact of endogenous EGFRvIII expression on chemosensitivity and the mechanisms underlying any differential treatment response. EGFRvIII expression was associated with prolonged median overall survival but only for GBM patients with MGMT promoter methylated tumors. In line with this, we observed increased TMZ sensitivity of EGFRvIII+ and MGMT promoter methylated cells, which translated into improved survival in xenograft experiments. The increased TMZ sensitivity was associated with an elevated DNA damage induction accompanied by an increased expression of DNA mismatch repair (MMR) proteins in EGFRvIII+ cell lines and EGFRvIII+ GBM patient samples. Subsequently, only a moderate reduction in MMR protein expression resulted in a dramatic TMZ resistance, suggesting that EGFRvIII expression specifically sensitized MGMT deficient cells to TMZ treatment by upregulating MMR. Furthermore, EGFRvIII expression in GBM cell lines was accompanied by increased DNA damage, replication fork slowing, stalling and enhanced origin firing, implying replication stress. Targeting of EGFRvIII-dependent replication stress by irinotecan led to hypersensitivity of EGFRvIII+ cells. Taken together this study illustrates that EGFRvIII-induced upregulation of MMR and replication stress increases chemosensitivity thereby highlighting the vulnerability of EGFRvIII+ GBM to available treatments. These important data may also guide the development of new and more effective personalized strategies.
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Affiliation(s)
- Nina Struve
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Zev A Binder
- Department of Neurosurgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Lucy F Stead
- Leeds Institute of Medical Research at St James’s, Wellcome Trust Brenner Building, St. James’s University Hospital, Leeds, United Kingdom
| | - Tim Brend
- Leeds Institute of Medical Research at St James’s, Wellcome Trust Brenner Building, St. James’s University Hospital, Leeds, United Kingdom
| | - Stephen J Bagley
- Division of Hematology/Oncology, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Claire Faulkner
- Bristol Genetics Laboratory, Southmead Hospital, Bristol, United Kingdom
| | - Leonie Ott
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Justus Müller-Goebel
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anna-Sophie Weik
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Konstantin Hoffer
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thorsten Rieckmann
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ann Christin Parplys
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jasmin Burmester
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Marvin Henze
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jennifer J D Morrissette
- Division of Precision and Computational Diagnostics, Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Ulrich Schüller
- Research Institute Children’s Cancer Center Hamburg, Hamburg, Germany
| | - Cordula Petersen
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kai Rothkamm
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kathreena M Kurian
- Bristol Brain Tumour Research Centre, University of Bristol, Bristol, England, United Kingdom
| | - Susan C Short
- Leeds Institute of Medical Research at St James’s, Wellcome Trust Brenner Building, St. James’s University Hospital, Leeds, United Kingdom
| | - Malte Kriegs
- Laboratory of Radiobiology & Experimental Radiation Oncology, Hubertus Wald Tumorzentrum – University Cancer Center Hamburg, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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8
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Parplys AC, Borgmann K. Basic Radiobiology. Radiat Oncol 2019. [DOI: 10.1007/978-3-319-52619-5_72-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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9
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Winqvist R, Bose M, Sachsenweger J, Laurila N, Parplys AC, Willmann J, Eshraghi L, Dunlop TW, Groth M, Rapakko K, Nieminen P, Friedl TW, Heiserich L, Meyer F, Tuppurainen H, Devarajan GR, Peltoketo H, Nevanlinna H, Pylkäs K, Borgmann K, Wiesmuller L, Pospiech H. Abstract 339: Heterozygous germline mutation in ABRAXAS causes BRCA1 mislocalization and DNA damage response defects. Cancer Res 2018. [DOI: 10.1158/1538-7445.am2018-339] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Whilst heterozygous germline mutations in the ABRAXAS gene have been associated with hereditary breast cancer predisposition, their initial effect on promoting tumorigenesis at the cellular level has not been explored. Here, we demonstrate in patient-derived cells that the Finnish ABRAXAS founder mutation (c.1082G>A, Arg361Gln), even in the heterozygous state leads to decreased BRCA1 protein levels as well as reduced nuclear localization and foci formation of BRCA1 and CtIP. This causes disturbances in basal BRCA1-A complex localization, which is reflected by a restraint in error-prone DNA double-strand break (DSB) repair pathway usage, attenuated DNA damage response, deregulated G2-M checkpoint control and apoptosis. Most importantly, mutation carrier cells display a change in their transcriptional profile, which we attribute to the reduced nuclear levels of BRCA1. The current study clearly demonstrates how the Finnish ABRAXAS founder mutation acts in a dominant-negative manner on BRCA1 to promote genome destabilisation in heterozygous carrier cells.
Citation Format: Robert Winqvist, Muthiah Bose, Juliane Sachsenweger, Niina Laurila, Ann Christin Parplys, Jonas Willmann, Leila Eshraghi, Thomas W. Dunlop, Marco Groth, Katrin Rapakko, Pentti Nieminen, Thomas W. Friedl, Lisa Heiserich, Felix Meyer, Hanna Tuppurainen, Ganapathy Raman Devarajan, Hellevi Peltoketo, Heli Nevanlinna, Katri Pylkäs, Kerstin Borgmann, Lisa Wiesmuller, Helmut Pospiech. Heterozygous germline mutation in ABRAXAS causes BRCA1 mislocalization and DNA damage response defects [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 339.
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Affiliation(s)
| | - Muthiah Bose
- 1University of Oulu / NordLab Oulu, Oulu, Finland
| | | | | | - Ann Christin Parplys
- 3University Cancer Center Hamburg (UCCH) / University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jonas Willmann
- 4University Cancer Center Hamburg (UCCH), Hamburg, Germany
| | | | | | - Marco Groth
- 6Leibniz Institute of Aging - Fritz Lipmann Institute, Jena, Germany
| | - Katrin Rapakko
- 7Northern Finland Laboratory Centre NordLab Oulu, Oulu, Finland
| | | | | | | | - Felix Meyer
- 3University Cancer Center Hamburg (UCCH) / University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | | | | | - Heli Nevanlinna
- 11University of Helsinki / Helsinki University Central Hospital, Helsinki, Finland
| | - Katri Pylkäs
- 1University of Oulu / NordLab Oulu, Oulu, Finland
| | - Kerstin Borgmann
- 3University Cancer Center Hamburg (UCCH) / University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Helmut Pospiech
- 12University of Oulu / Leibniz Institute of Aging - Fritz Lipmann Institute, Oulu / Jena, Finland
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10
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Heim D, Gil-Ibanez I, Herden J, Parplys AC, Borgmann K, Schmidt-Arras D, Lohse AW, Rose-John S, Wege H. Constitutive gp130 activation rapidly accelerates the transformation of human hepatocytes via an impaired oxidative stress response. Oncotarget 2018; 7:55639-55648. [PMID: 27489351 PMCID: PMC5342442 DOI: 10.18632/oncotarget.10956] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 07/09/2016] [Indexed: 01/29/2023] Open
Abstract
Pro-inflammatory signaling pathways, especially interleukin 6 (IL-6), and reactive oxygen species (ROS) promote carcinogenesis in the liver. In order to elucidate the underlying oncogenic mechanism, we activated the IL-6 signal transducer glycoprotein 130 (gp130) via stable expression of a constitutively active gp130 construct (L-gp130) in untransformed telomerase-immortalized human fetal hepatocytes (FH-hTERT). As known from hepatocellular adenomas, forced gp130 activation alone was not sufficient to induce malignant transformation. However, additional challenge of FH-hTERT L-gp130 clones with oxidative stress resulted in 2- to 3-fold higher ROS levels and up to 6-fold more DNA-double strand breaks (DSB). Despite increased DNA damage, ROS-challenged FH-hTERT L-gp130 clones displayed an enhanced proliferation and rapidly developed colony growth capabilities in soft agar. As driving gp130-mediated oncogenic mechanism, we detected a decreased expression of antioxidant genes, in particular glutathione peroxidase 3 and apolipoprotein E, and an absence of P21 upregulation following ROS-conferred induction of DSB. In summary, an impaired oxidative stress response in hepatocytes with gp130 gain-of-function mutations, as detected in dysplastic intrahepatic nodules and hepatocellular adenomas, is one of the central oncogenic mechanisms in chronic liver inflammation.
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Affiliation(s)
- Denise Heim
- Department of Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Ines Gil-Ibanez
- Department of Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Johannes Herden
- Department of Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Ann Christin Parplys
- Laboratory of Radiobiology and Experimental Radiooncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Kerstin Borgmann
- Laboratory of Radiobiology and Experimental Radiooncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Dirk Schmidt-Arras
- Institute of Biochemistry, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Ansgar W Lohse
- Department of Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
| | - Stefan Rose-John
- Institute of Biochemistry, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Henning Wege
- Department of Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany
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11
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Abstract
Cdc45 is an essential protein that together with Mcm2-7 and GINS forms the eukaryotic replicative helicase CMG. Cdc45 seems to be rate limiting for the initial unwinding or firing of replication origins. In line with this view, Cdc45-overexpressing cells fired at least twice as many origins as control cells. However, these cells displayed an about 2-fold diminished fork elongation rate, a pronounced asymmetry of replication fork extension, and an early S phase arrest. This was accompanied by H2AX-phosphorylation and subsequent apoptosis. Unexpectedly, we did not observe increased ATR/Chk1 signaling but rather a mild ATM/Chk2 response. In addition, we detected accumulation of long stretches of single-stranded DNA, a hallmark of replication catastrophe. We conclude that increased origin firing by upregulated Cdc45 caused exhaustion of the single-strand binding protein RPA, which in consequence diminished the ATR/Chk1 response; the subsequently occurring fork breaks led to an ATM/Chk2 mediated phosphorylation of H2AX and eventually to apoptosis.
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Affiliation(s)
- Carsten Köhler
- a Research group Biochemistry, Leibniz Institute for Age Research - Fritz Lipmann Institute , Jena , Germany
| | - Dennis Koalick
- a Research group Biochemistry, Leibniz Institute for Age Research - Fritz Lipmann Institute , Jena , Germany
| | - Anja Fabricius
- a Research group Biochemistry, Leibniz Institute for Age Research - Fritz Lipmann Institute , Jena , Germany
| | - Ann Christin Parplys
- b Laboratory of Radiobiology and Experimental Radiation Oncology, University Medical Center Hamburg-Eppendorf , Hamburg , Germany
| | - Kerstin Borgmann
- b Laboratory of Radiobiology and Experimental Radiation Oncology, University Medical Center Hamburg-Eppendorf , Hamburg , Germany
| | - Helmut Pospiech
- a Research group Biochemistry, Leibniz Institute for Age Research - Fritz Lipmann Institute , Jena , Germany.,c Faculty of Biochemistry and Molecular Medicine, University of Oulu , Finland
| | - Frank Grosse
- a Research group Biochemistry, Leibniz Institute for Age Research - Fritz Lipmann Institute , Jena , Germany.,d Centre for Molecular Biomedicine, Friedrich-Schiller University , Jena , Germany
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12
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Parplys AC, Seelbach JI, Becker S, Behr M, Wrona A, Jend C, Mansour WY, Joosse SA, Stuerzbecher HW, Pospiech H, Petersen C, Dikomey E, Borgmann K. High levels of RAD51 perturb DNA replication elongation and cause unscheduled origin firing due to impaired CHK1 activation. Cell Cycle 2016; 14:3190-202. [PMID: 26317153 DOI: 10.1080/15384101.2015.1055996] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
In response to replication stress ATR signaling through CHK1 controls the intra-S checkpoint and is required for the maintenance of genomic integrity. Homologous recombination (HR) comprises a series of interrelated pathways that function in the repair of DNA double strand breaks and interstrand crosslinks. In addition, HR, with its key player RAD51, provides critical support for the recovery of stalled forks during replication. High levels of RAD51 are regularly found in various cancers, yet little is known about the effect of the increased RAD51 expression on intra-S checkpoint signaling. Here, we describe a role for RAD51 in driving genomic instability caused by impaired replication and intra-S mediated CHK1 signaling by studying an inducible RAD51 overexpression model as well as 10 breast cancer cell lines. We demonstrate that an excess of RAD51 decreases I-Sce-I mediated HR despite formation of more RAD51 foci. Cells with high RAD51 levels display reduced elongation rates and excessive dormant origin firing during undisturbed growth and after damage, likely caused by impaired CHK1 activation. In consequence, the inability of cells with a surplus of RAD51 to properly repair complex DNA damage and to resolve replication stress leads to higher genomic instability and thus drives tumorigenesis.
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Affiliation(s)
- Ann Christin Parplys
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Jasna Irena Seelbach
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Saskia Becker
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Matthias Behr
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Agnieszka Wrona
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Camilla Jend
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Wael Yassin Mansour
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany.,b Tumor Biology Department; National Cancer Institute; Cairo University ; Cairo , Egypt
| | - Simon Andreas Joosse
- d Department of Tumor Biology ; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | | | - Helmut Pospiech
- f Leibniz Institute for Age Research - Fritz Lipmann Institute ; Jena , Germany.,g Faculty of Biochemistry and Molecular Medicine; University of Oulu ; Oulu , Finland
| | - Cordula Petersen
- c Department of Radiotherapy and Radiooncology ; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Ekkehard Dikomey
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
| | - Kerstin Borgmann
- a Laboratory of Radiobiology & Experimental Radiooncology; University Medical Center Hamburg-Eppendorf ; Hamburg , Germany
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13
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Parplys AC, Petermann E, Petersen C, Dikomey E, Borgmann K. DNA damage by X-rays and their impact on replication processes. Radiother Oncol 2012; 102:466-71. [PMID: 22326574 DOI: 10.1016/j.radonc.2012.01.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 12/08/2011] [Accepted: 01/02/2012] [Indexed: 12/23/2022]
Abstract
BACKGROUND Replication-dependent radiosensitization of tumors ranks among the most promising tools for future improvements in tumor therapy. However, cell cycle checkpoint signaling during S phase is a key for maintaining genomic stability after ionizing irradiation allowing DNA damage repair by stabilizing replication forks, inhibiting new origin firing and recruiting DNA repair proteins. As the impact of the different types of DNA damage induced by ionizing radiation on replication fork functionality has not been investigated, this study was performed in tumor cells treated with various agents that induce specific DNA lesions. METHODS U2OS cells were exposed to methyl methanesulfonate (MMS) to induce base damage, low or high concentrations of hydrogen peroxide for the induction of SSBs, Topotecan to induce DSBs at replication, Mitomycin C (MMC) to induce interstrand cross-links or ionizing irradiation to analyze all damages. Chk1 phosphorylation, origin firing and replication fork progression, and cell cycle distribution were analyzed. RESULTS In our system, the extent of Chk1 phosphorylation was dependent on the type of damage induced and prolonged Chk1 phosphorylation correlated with the inhibition of replication initiation. Ionizing radiation, high concentrations of hydrogen peroxide, and Topotecan affected replication elongation much more strongly that the other agents. Almost all agents induced a slight increase in the S phase population but subsequent G2 arrest was only observed in response to those agents that strongly inhibited replication elongation and caused prolonged Chk1 phosphorylation. CONCLUSIONS Our data suggest that to improve radiotherapy, radiosensitivity in S phase could be increased by combining irradiation with agents that induce secondary DSB or inhibit checkpoint signaling, such as inhibitors of PARP or Chk1.
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