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Murthy GSG, Saliba AN, Szabo A, Harrington A, Abedin S, Carlson K, Michaelis L, Runaas L, Baim A, Hinman A, Maldonado-Schmidt S, Venkatachalam A, Flatten KS, Peterson KL, Schneider PA, Litzow M, Kaufmann SH, Atallah E. A phase I study of pevonedistat, azacitidine, and venetoclax in patients with relapsed/refractory acute myeloid leukemia. Haematologica 2024. [PMID: 38572562 DOI: 10.3324/haematol.2024.285014] [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] [Received: 01/12/2024] [Indexed: 04/05/2024] Open
Abstract
Azacitidine/venetoclax is an active regimen in patients with newly diagnosed AML. However, primary or secondary resistance to azacitidine/venetoclax is an area of unmet need and overexpression of MCL-1 is suggested to be a potential resistance mechanism. Pevonedistat inhibits MCL-1 through activation of NOXA, and pevonedistat/azacitidine has previously shown activity in AML. To assess the tolerability and efficacy of adding pevonedistat to azacitidine/venetoclax in relapsed/refractory AML, we conducted a phase I multicenter openlabel study in 16 adults with relapsed/refractory AML. Patients were treated with azacitidine, venetoclax along with pevonedistat intravenously on days 1, 3 and 5 of each 28-day cycle at 10, 15 or 20 mg/m2 in successive cohorts in the dose escalation phase. The impact of treatment on protein neddylation as well as expression of pro-apoptotic BCL2 family members was assessed. The recommended phase II dose of pevonedistat was 20 mg/m2. Grade 3 or higher adverse events included neutropenia (31%), thrombocytopenia (13%), febrile neutropenia (19%), anemia (19%), hypertension (19%) and sepsis (19%). The overall response rate was 46.7% for the whole cohort including complete remission (CR) in 5 of 7 (71.4%) patients who were naïve to the hypomethylating agent/venetoclax. No measurable residual disease (MRD) was detected in 80.0% of the patients who achieved CR. The median time to best response was 50 (range: 23 - 77) days. Four patients were bridged to allogeneic stem cell transplantation. The combination of azacitidine, venetoclax and pevonedistat is safe and shows encouraging preliminary activity in patients with relapsed/refractory AML. (NCT04172844).
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Affiliation(s)
| | | | - Aniko Szabo
- Department of Biostatistics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | | | - Sameem Abedin
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Karen Carlson
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Laura Michaelis
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Lyndsey Runaas
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Arielle Baim
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Alex Hinman
- Clinical Trials Office, Medical College of Wisconsin, Milwaukee, Wisconsin
| | | | | | - Karen S Flatten
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN; Division of Oncology Research, Mayo Clinic, Rochester, MN
| | - Kevin L Peterson
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN; Division of Oncology Research, Mayo Clinic, Rochester, MN
| | - Paula A Schneider
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN; Division of Oncology Research, Mayo Clinic, Rochester, MN
| | - Mark Litzow
- Division of Hematology, Mayo Clinic, Rochester, Minnesota
| | - Scott H Kaufmann
- Division of Hematology, Mayo Clinic, Rochester, Minnesota; Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN; Division of Oncology Research, Mayo Clinic, Rochester, MN
| | - Ehab Atallah
- Division of Hematology-Oncology, Medical College of Wisconsin, Milwaukee, Wisconsin
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Jia J, Ji W, Saliba AN, Csizmar CM, Ye K, Hu L, Peterson KL, Schneider PA, Meng XW, Venkatachalam A, Patnaik MM, Webster JA, Smith BD, Ghiaur G, Wu X, Zhong J, Pandey A, Flatten KS, Deng Q, Wang H, Kaufmann SH, Dai H. AMPK inhibition sensitizes acute leukemia cells to BH3 mimetic-induced cell death. Cell Death Differ 2024; 31:405-416. [PMID: 38538744 PMCID: PMC11043078 DOI: 10.1038/s41418-024-01283-9] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/14/2024] [Accepted: 03/18/2024] [Indexed: 04/26/2024] Open
Abstract
BH3 mimetics, including the BCL2/BCLXL/BCLw inhibitor navitoclax and MCL1 inhibitors S64315 and tapotoclax, have undergone clinical testing for a variety of neoplasms. Because of toxicities, including thrombocytopenia after BCLXL inhibition as well as hematopoietic, hepatic and possible cardiac toxicities after MCL1 inhibition, there is substantial interest in finding agents that can safely sensitize neoplastic cells to these BH3 mimetics. Building on the observation that BH3 mimetic monotherapy induces AMP kinase (AMPK) activation in multiple acute leukemia cell lines, we report that the AMPK inhibitors (AMPKis) dorsomorphin and BAY-3827 sensitize these cells to navitoclax or MCL1 inhibitors. Cell fractionation and phosphoproteomic analyses suggest that sensitization by dorsomorphin involves dephosphorylation of the proapoptotic BCL2 family member BAD at Ser75 and Ser99, leading BAD to translocate to mitochondria and inhibit BCLXL. Consistent with these results, BAD knockout or mutation to BAD S75E/S99E abolishes the sensitizing effects of dorsomorphin. Conversely, dorsomorphin synergizes with navitoclax or the MCL1 inhibitor S63845 to induce cell death in primary acute leukemia samples ex vivo and increases the antitumor effects of navitoclax or S63845 in several xenograft models in vivo with little or no increase in toxicity in normal tissues. These results suggest that AMPK inhibition can sensitize acute leukemia to multiple BH3 mimetics, potentially allowing administration of lower doses while inducing similar antineoplastic effects.
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Affiliation(s)
- Jia Jia
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- University of Science and Technology of China, Hefei, 230026, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Wenbo Ji
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- University of Science and Technology of China, Hefei, 230026, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Antoine N Saliba
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN, 55905, USA
| | - Clifford M Csizmar
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
| | - Kaiqin Ye
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Lei Hu
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- University of Science and Technology of China, Hefei, 230026, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Kevin L Peterson
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Paula A Schneider
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - X Wei Meng
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Annapoorna Venkatachalam
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Mrinal M Patnaik
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN, 55905, USA
| | - Jonathan A Webster
- Adult Leukemia Program, Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, 21287, USA
| | - B Douglas Smith
- Adult Leukemia Program, Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, 21287, USA
| | - Gabriel Ghiaur
- Adult Leukemia Program, Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, 21287, USA
| | - Xinyan Wu
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Jun Zhong
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Akhilesh Pandey
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
- Manipal Academy of Higher Education, Manipal, 576104, Kamataka, India
| | - Karen S Flatten
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Qingmei Deng
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Hongzhi Wang
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China
| | - Scott H Kaufmann
- Division of Hematology, Department of Medicine, Mayo Clinic, Rochester, MN, 55905, USA.
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA.
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA.
| | - Haiming Dai
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China.
- Division of Oncology Research, Department of Oncology, Mayo Clinic, Rochester, MN, 55905, USA.
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Al‐Kali A, Aldoss I, Atherton PJ, Strand CA, Shah B, Webster J, Bhatnagar B, Flatten KS, Peterson KL, Schneider PA, Buhrow SA, Kong J, Reid JM, Adjei AA, Kaufmann SH. A phase 2 and pharmacological study of sapanisertib in patients with relapsed and/or refractory acute lymphoblastic leukemia. Cancer Med 2023; 12:21229-21239. [PMID: 37960985 PMCID: PMC10726920 DOI: 10.1002/cam4.6701] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 10/15/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Despite recent approval of several new agents, relapsed acute lymphoblastic leukemia (ALL) remains challenging to treat. Sapanisertib (MLN0128/TAK-228) is an oral TORC1/2 inhibitor that exhibited preclinical activity against ALL. METHODS We conducted a single-arm multi-center Phase II study of sapanisertib monotherapy (3 mg orally daily of the milled formulation for 21 days every 28 days) in patients with ALL through the Experimental Therapeutics Clinical Trials Network (NCI-9775). RESULTS Sixteen patients, 15 of whom were previously treated (median 3 prior lines of therapy), were enrolled. Major grade 3-4 non-hematologic toxicities included mucositis (3 patients) and hyperglycemia (2 patients) as well as hepatic failure, seizures, confusion, pneumonitis, and anorexia (1 patient each). Grade >2 hematological toxicity included leukopenia (3), lymphopenia (2), thrombocytopenia, and neutropenia (1). The best response was stable disease in 2 patients (12.5%), while only 3 patients (19%) were able to proceed to Cycle 2. Pharmacokinetic analysis demonstrated drug exposures similar to those observed in solid tumor patients. Immunoblotting in serially collected samples indicated limited impact of treatment on phosphorylation of mTOR pathway substrates such as 4EBP1, S6, and AKT. CONCLUSION In summary, single-agent sapanisertib had a good safety profile but limited target inhibition or efficacy in ALL as a single agent. This trial was registered at ClinicalTrials.gov as NCT02484430.
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Affiliation(s)
- Aref Al‐Kali
- Division of HematologyMayo ClinicRochesterMinnesotaUSA
| | - Ibrahim Aldoss
- Division of Hematology and Hematopoietic Cell TransplantationCity of Hope National Medical CenterDuarteCaliforniaUSA
| | | | | | - Bijal Shah
- Division of HematologyMoffitt Cancer CenterTampaFloridaUSA
| | - Jonathan Webster
- Division of Hematological MalignanciesJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Bhavana Bhatnagar
- Section of Hematology and Medical OncologyWest Virginia UniversityMorgantownWest VirginiaUSA
| | | | | | | | - Sarah A. Buhrow
- Division of Oncology ResearchMayo ClinicRochesterMinnesotaUSA
| | - Jianping Kong
- Division of Oncology ResearchMayo ClinicRochesterMinnesotaUSA
| | - Joel M. Reid
- Division of Oncology ResearchMayo ClinicRochesterMinnesotaUSA
| | - Alex A. Adjei
- Division of Medical OncologyMayo ClinicRochesterMinnesotaUSA
- Present address:
Tausig Cancer Institute, Cleveland ClinicClevelandOhioUSA
| | - Scott H. Kaufmann
- Division of HematologyMayo ClinicRochesterMinnesotaUSA
- Division of Oncology ResearchMayo ClinicRochesterMinnesotaUSA
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4
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Dai H, Peterson KL, Flatten KS, Meng XW, Venkatachalam A, Correia C, Ramirez-Alvarado M, Pang YP, Kaufmann SH. A BAK subdomain that binds mitochondrial lipids selectively and releases cytochrome C. Cell Death Differ 2023; 30:794-808. [PMID: 36376382 PMCID: PMC9984382 DOI: 10.1038/s41418-022-01083-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 10/20/2022] [Accepted: 10/28/2022] [Indexed: 11/16/2022] Open
Abstract
How BAK and BAX induce mitochondrial outer membrane (MOM) permeabilization (MOMP) during apoptosis is incompletely understood. Here we have used molecular dynamics simulations, surface plasmon resonance, and assays for membrane permeabilization in vitro and in vivo to assess the structure and function of selected BAK subdomains and their derivatives. Results of these studies demonstrate that BAK helical regions α5 and α6 bind the MOM lipid cardiolipin. While individual peptides corresponding to these helical regions lack the full biological activity of BAK, tandem peptides corresponding to α4-α5, α5-α6, or α6-α7/8 can localize exogenous proteins to mitochondria, permeabilize liposomes composed of MOM lipids, and cause MOMP in the absence of the remainder of the BAK protein. Importantly, the ability of these tandem helices to induce MOMP under cell-free conditions is diminished by mutations that disrupt the U-shaped helix-turn-helix structure of the tandem peptides or decrease their lipid binding. Likewise, BAK-induced apoptosis in intact cells is diminished by CLS1 gene interruption, which decreases mitochondrial cardiolipin content, or by BAK mutations that disrupt the U-shaped tandem peptide structure or diminish lipid binding. Collectively, these results suggest that BAK structural rearrangements during apoptosis might mobilize helices involved in specific protein-lipid interactions that are critical for MOMP.
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Affiliation(s)
- Haiming Dai
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA.
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA.
- Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
- Hefei Cancer Hospital, Chinese Academy of Sciences, Hefei, 230031, China.
| | - Kevin L Peterson
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - X Wei Meng
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Cristina Correia
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Yuan-Ping Pang
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA
| | - Scott H Kaufmann
- Division of Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA.
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, 55905, USA.
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5
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Venkatachalam A, Peterson KL, Correia C, Flatten KS, Hou X, Schneider PA, Balczewski E, McGehee C, Hurley RM, Meng XW, Sine C, Shah R, Vincelettte N, Ding H, Li H, Weroha S(J, Kaufmann SH. Abstract 1832: CHK1 inhibitor prexasertib induces NOXA-dependent apoptosis in ovarian cancer. Cancer Res 2022. [DOI: 10.1158/1538-7445.am2022-1832] [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
Background: The kinases ataxia-telangiectasia-mutated-and-Rad3-related (ATR), checkpoint kinase 1 (CHK1) and WEE1 participate in the response to replication stress. Inhibitors of ATR, WEE1 and CHK1 are being tested for antineoplastic activity as monotherapies and in combination with chemotherapy. Although these agents impair cell cycle checkpoints, fork stabilization, origin firing and homologous recombination (HR), little is known about the apoptotic pathways that are engaged and the critical mediators activating cell death mechanisms. The present study utilizes high grade serous ovarian cancer (HGSOC) cell lines and patient derived xenografts (PDXs) to identify the primary mechanism of cell death in ovarian cancer and assess changes involved in the resistance setting after treatment with these inhibitors.
Methods: A panel of HGSOC cell lines was examined for responses to ceralasertib (ATRi), prexasertib (CHK1i) or adavosertib (WEE1i) using colony forming assays, immunoblotting and assays for apoptosis. Mechanisms involved in acquired resistance and downstream changes in cell fate were evaluated by generating prexasertib-resistant HGSOC cell lines. Subsequent NGS analysis was performed in the sensitive and resistant pairs.
Results: Irrespective of the homologous recombination (HR) status, ovarian cell lines and PDXs underwent cell death during prolonged exposure at clinically achievable concentrations. Treatment of ovarian cancer cell lines with ATRi, CHK1i or WEE1i activated the replication checkpoint, consistent with previously published reports. The subsequent apoptotic response involved PMAIP1 and BCL2L11 upregulation rather than the TNFa-induced death receptor-mediated apoptosis we recently described in acute leukemia (Cancer Res. PMID: 33414171). Additionally, ovarian lines selected for CHK1i resistance failed to die in response to either ATRi or WEE1i.
Conclusions: Prexasertib, ceralasertib, and adavosertib exhibit monotherapy activity in both HR deficient and proficient HGSOC cell lines and PDX models. Unlike AML, death receptor mediated apoptosis was not observed; instead, the primary mechanism of cell killing in HGSOC lines involves activation of the mitochondrial apoptotic pathway. Cross-resistance of these DNA damage repair modulators is likely multifactorial and mainly involves diminished replication stress response.
Citation Format: Annapoorna Venkatachalam, Kevin L. Peterson, Cristina Correia, Karen S. Flatten, Xianon Hou, Paula A. Schneider, Emily Balczewski, Cordelia McGehee, Rachel M. Hurley, Xue W. Meng, Chance Sine, Rameen Shah, Nicole Vincelettte, Husheng Ding, Hu Li, Saravut (John) Weroha, Scott H. Kaufmann. CHK1 inhibitor prexasertib induces NOXA-dependent apoptosis in ovarian cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 1832.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - Hu Li
- 1Mayo Clinic, Rochester, MN
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6
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Wahner Hendrickson AE, Visscher DW, Hou X, Goergen KM, Atkinson HJ, Beito TG, Negron V, Lingle WL, Bruzek AK, Hurley RM, Wagner JM, Flatten KS, Peterson KL, Schneider PA, Larson MC, Maurer MJ, Kalli KR, Oberg AL, Weroha SJ, Kaufmann SH. CHFR and Paclitaxel Sensitivity of Ovarian Cancer. Cancers (Basel) 2021; 13:cancers13236043. [PMID: 34885153 PMCID: PMC8657201 DOI: 10.3390/cancers13236043] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2021] [Revised: 11/17/2021] [Accepted: 11/27/2021] [Indexed: 12/14/2022] Open
Abstract
The poly(ADP-ribose) binding protein CHFR regulates cellular responses to mitotic stress. The deubiquitinase UBC13, which regulates CHFR levels, has been associated with better overall survival in paclitaxel-treated ovarian cancer. Despite the extensive use of taxanes in the treatment of ovarian cancer, little is known about expression of CHFR itself in this disease. In the present study, tissue microarrays containing ovarian carcinoma samples from 417 women who underwent initial surgical debulking were stained with anti-CHFR antibody and scored in a blinded fashion. CHFR levels, expressed as a modified H-score, were examined for association with histology, grade, time to progression (TTP) and overall survival (OS). In addition, patient-derived xenografts from 69 ovarian carcinoma patients were examined for CHFR expression and sensitivity to paclitaxel monotherapy. In clinical ovarian cancer specimens, CHFR expression was positively associated with serous histology (p = 0.0048), higher grade (p = 0.000014) and higher stage (p = 0.016). After correction for stage and debulking, there was no significant association between CHFR staining and overall survival (p = 0.62) or time to progression (p = 0.91) in patients with high grade serous cancers treated with platinum/taxane chemotherapy (N = 249). Likewise, no association between CHFR expression and paclitaxel sensitivity was observed in ovarian cancer PDXs treated with paclitaxel monotherapy. Accordingly, differences in CHFR expression are unlikely to play a major role in paclitaxel sensitivity of high grade serous ovarian cancer.
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Affiliation(s)
- Andrea E. Wahner Hendrickson
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (X.H.); (J.M.W.); (S.J.W.)
- Correspondence: (A.E.W.H.); (S.H.K.); Tel.: +1-507-284-3731 (A.E.W.H.); +1-507-284-8950 (S.H.K.); Fax: +1-507-293-0107 (A.E.W.H. & S.H.K.)
| | - Daniel W. Visscher
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA;
| | - Xiaonan Hou
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (X.H.); (J.M.W.); (S.J.W.)
| | - Krista M. Goergen
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA; (K.M.G.); (H.J.A.); (M.C.L.); (M.J.M.); (A.L.O.)
| | - Hunter J. Atkinson
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA; (K.M.G.); (H.J.A.); (M.C.L.); (M.J.M.); (A.L.O.)
| | | | - Vivian Negron
- Pathology Research Core, Mayo Clinic, Rochester, MN 55905, USA; (V.N.); (W.L.L.); (A.K.B.)
| | - Wilma L. Lingle
- Pathology Research Core, Mayo Clinic, Rochester, MN 55905, USA; (V.N.); (W.L.L.); (A.K.B.)
| | - Amy K. Bruzek
- Pathology Research Core, Mayo Clinic, Rochester, MN 55905, USA; (V.N.); (W.L.L.); (A.K.B.)
| | - Rachel M. Hurley
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, USA;
| | - Jill M. Wagner
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (X.H.); (J.M.W.); (S.J.W.)
| | - Karen S. Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA; (K.S.F.); (K.L.P.); (P.A.S.)
| | - Kevin L. Peterson
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA; (K.S.F.); (K.L.P.); (P.A.S.)
| | - Paula A. Schneider
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA; (K.S.F.); (K.L.P.); (P.A.S.)
| | - Melissa C. Larson
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA; (K.M.G.); (H.J.A.); (M.C.L.); (M.J.M.); (A.L.O.)
| | - Matthew J. Maurer
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA; (K.M.G.); (H.J.A.); (M.C.L.); (M.J.M.); (A.L.O.)
| | | | - Ann L. Oberg
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55905, USA; (K.M.G.); (H.J.A.); (M.C.L.); (M.J.M.); (A.L.O.)
| | - S. John Weroha
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905, USA; (X.H.); (J.M.W.); (S.J.W.)
| | - Scott H. Kaufmann
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, USA;
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA; (K.S.F.); (K.L.P.); (P.A.S.)
- Correspondence: (A.E.W.H.); (S.H.K.); Tel.: +1-507-284-3731 (A.E.W.H.); +1-507-284-8950 (S.H.K.); Fax: +1-507-293-0107 (A.E.W.H. & S.H.K.)
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7
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Schroeder B, Vander Steen T, Espinoza I, Venkatapoorna CMK, Hu Z, Silva FM, Regan K, Cuyàs E, Meng XW, Verdura S, Arbusà A, Schneider PA, Flatten KS, Kemble G, Montero J, Kaufmann SH, Menendez JA, Lupu R. Fatty acid synthase (FASN) regulates the mitochondrial priming of cancer cells. Cell Death Dis 2021; 12:977. [PMID: 34675185 PMCID: PMC8531299 DOI: 10.1038/s41419-021-04262-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [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: 03/10/2021] [Revised: 09/12/2021] [Accepted: 09/24/2021] [Indexed: 12/24/2022]
Abstract
Inhibitors of the lipogenic enzyme fatty acid synthase (FASN) have attracted much attention in the last decade as potential targeted cancer therapies. However, little is known about the molecular determinants of cancer cell sensitivity to FASN inhibitors (FASNis), which is a major roadblock to their therapeutic application. Here, we find that pharmacological starvation of endogenously produced FAs is a previously unrecognized metabolic stress that heightens mitochondrial apoptotic priming and favors cell death induction by BH3 mimetic inhibitors. Evaluation of the death decision circuits controlled by the BCL-2 family of proteins revealed that FASN inhibition is accompanied by the upregulation of the pro-death BH3-only proteins BIM, PUMA, and NOXA. Cell death triggered by FASN inhibition, which causally involves a palmitate/NADPH-related redox imbalance, is markedly diminished by concurrent loss of BIM or PUMA, suggesting that FASN activity controls cancer cell survival by fine-tuning the BH3 only proteins-dependent mitochondrial threshold for apoptosis. FASN inhibition results in a heightened mitochondrial apoptosis priming, shifting cells toward a primed-for-death state "addicted" to the anti-apoptotic protein BCL-2. Accordingly, co-administration of a FASNi synergistically augments the apoptosis-inducing activity of the dual BCL-XL/BCL-2 inhibitor ABT-263 (navitoclax) and the BCL-2 specific BH3-mimetic ABT-199 (venetoclax). FASN inhibition, however, fails to sensitize breast cancer cells to MCL-1- and BCL-XL-selective inhibitors such as S63845 and A1331852. A human breast cancer xenograft model evidenced that oral administration of the only clinically available FASNi drastically sensitizes FASN-addicted breast tumors to ineffective single-agents navitoclax and venetoclax in vivo. In summary, a novel FASN-driven facet of the mitochondrial priming mechanistically links the redox-buffering mechanism of FASN activity to the intrinsic apoptotic threshold in breast cancer cells. Combining next-generation FASNis with BCL-2-specific BH3 mimetics that directly activate the apoptotic machinery might generate more potent and longer-lasting antitumor responses in a clinical setting.
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Affiliation(s)
- Barbara Schroeder
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.,Mayo Clinic Cancer Center, Rochester, MN, 55905, USA.,Helmholtz Pioneer Campus, Heimholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH), Ingolstädter Landstraße 1 D-85764 Neuherberg, Munich, Germany
| | - Travis Vander Steen
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Ingrid Espinoza
- Department of Preventive Medicine, John D. Bower School of Population Health, University of Mississippi Medical Center, Jackson, MS, 39216, USA.,Cancer Institute, School of Medicine, University of Mississippi Medical Center, Jackson, MS, 39216, USA
| | - Chandra M Kurapaty Venkatapoorna
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.,Department of Nutrition, Dietetics, and Hospital Management, Auburn University, Auburn, AL, 36849, USA
| | - Zeng Hu
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.,Radiation Oncology Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Fernando Martín Silva
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028, Barcelona, Spain
| | - Kevin Regan
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Elisabet Cuyàs
- Girona Biomedical Research Institute, 17190, Salt, Girona, Spain.,Program Against Cancer Therapeutic Resistance (ProCURE), Metabolism & Cancer Group, Catalan Institute of Oncology, 17007, Girona, Spain
| | - X Wei Meng
- Deparment of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Sara Verdura
- Girona Biomedical Research Institute, 17190, Salt, Girona, Spain.,Program Against Cancer Therapeutic Resistance (ProCURE), Metabolism & Cancer Group, Catalan Institute of Oncology, 17007, Girona, Spain
| | - Aina Arbusà
- Girona Biomedical Research Institute, 17190, Salt, Girona, Spain.,Program Against Cancer Therapeutic Resistance (ProCURE), Metabolism & Cancer Group, Catalan Institute of Oncology, 17007, Girona, Spain
| | | | - Karen S Flatten
- Deparment of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - George Kemble
- Sagimet Biosciences (formerly 3-V Biosciences), San Mateo, CA, 94402, USA
| | - Joan Montero
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), 08028, Barcelona, Spain
| | - Scott H Kaufmann
- Mayo Clinic Cancer Center, Rochester, MN, 55905, USA.,Deparment of Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Javier A Menendez
- Department of Experimental Pathology, Mayo Clinic, Rochester, MN, 55905, USA. .,Girona Biomedical Research Institute, 17190, Salt, Girona, Spain.
| | - Ruth Lupu
- Division of Experimental Pathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA. .,Mayo Clinic Cancer Center, Rochester, MN, 55905, USA. .,Department of Biochemistry and Molecular Biology Laboratory, Mayo Clinic Laboratory, Rochester, MN, 55905, USA.
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8
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Hurley RM, McGehee CD, Nesic K, Correia C, Weiskittel TM, Kelly RL, Venkatachalam A, Hou X, Pathoulas NM, Meng XW, Kondrashova O, Radke MR, Schneider PA, Flatten KS, Peterson KL, Becker MA, Wong EM, Southey MS, Dobrovic A, Lin KK, Harding TC, McNeish I, Ross CA, Wagner JM, Wakefield MJ, Scott CL, Haluska P, Wahner Hendrickson AE, Karnitz LM, Swisher EM, Li H, Weroha SJ, Kaufmann SH. Characterization of a RAD51C-silenced high-grade serous ovarian cancer model during development of PARP inhibitor resistance. NAR Cancer 2021; 3:zcab028. [PMID: 34316715 PMCID: PMC8271218 DOI: 10.1093/narcan/zcab028] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 01/31/2021] [Revised: 05/28/2021] [Accepted: 06/22/2021] [Indexed: 12/13/2022] Open
Abstract
Acquired PARP inhibitor (PARPi) resistance in BRCA1- or BRCA2-mutant ovarian cancer often results from secondary mutations that restore expression of functional protein. RAD51C is a less commonly studied ovarian cancer susceptibility gene whose promoter is sometimes methylated, leading to homologous recombination (HR) deficiency and PARPi sensitivity. For this study, the PARPi-sensitive patient-derived ovarian cancer xenograft PH039, which lacks HR gene mutations but harbors RAD51C promoter methylation, was selected for PARPi resistance by cyclical niraparib treatment in vivo. PH039 acquired PARPi resistance by the third treatment cycle and grew through subsequent treatment with either niraparib or rucaparib. Transcriptional profiling throughout the course of resistance development showed widespread pathway level changes along with a marked increase in RAD51C mRNA, which reflected loss of RAD51C promoter methylation. Analysis of ovarian cancer samples from the ARIEL2 Part 1 clinical trial of rucaparib monotherapy likewise indicated an association between loss of RAD51C methylation prior to on-study biopsy and limited response. Interestingly, the PARPi resistant PH039 model remained platinum sensitive. Collectively, these results not only indicate that PARPi treatment pressure can reverse RAD51C methylation and restore RAD51C expression, but also provide a model for studying the clinical observation that PARPi and platinum sensitivity are sometimes dissociated.
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Affiliation(s)
- Rachel M Hurley
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Cordelia D McGehee
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Ksenija Nesic
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - Cristina Correia
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Taylor M Weiskittel
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Rebecca L Kelly
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Annapoorna Venkatachalam
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Xiaonan Hou
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905 USA
| | | | - X Wei Meng
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Olga Kondrashova
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - Marc R Radke
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA 98195, USA
| | | | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905 USA
| | - Kevin L Peterson
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905 USA
| | - Marc A Becker
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905 USA
| | - Ee Ming Wong
- Precision Medicine, School of Clinical Sciences at Monash Health, Monash University, Victoria 3800, Australia
| | - Melissa S Southey
- Precision Medicine, School of Clinical Sciences at Monash Health, Monash University, Victoria 3800, Australia
| | - Alexander Dobrovic
- University of Melbourne Department of Surgery, Austin Hospital, Heidelberg, Victoria 3084, Australia
| | - Kevin K Lin
- Clovis Oncology, San Francisco, CA 94158, USA
| | | | - Iain McNeish
- Division of Cancer, Department of Surgery and Cancer, Imperial College London, Hammersmith Campus, London, W12 0NN United Kingdom
| | - Christian A Ross
- Division of Information Technology, Mayo Clinic, Rochester, MN 55905, USA
| | - Jill M Wagner
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905 USA
| | - Matthew J Wakefield
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - Clare L Scott
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia
| | - Paul Haluska
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905 USA
| | | | - Larry M Karnitz
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - Elizabeth M Swisher
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA 98195, USA
| | - Hu Li
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
| | - S John Weroha
- Division of Medical Oncology, Mayo Clinic, Rochester, MN 55905 USA
| | - Scott H Kaufmann
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905 USA
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9
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Ding H, Vincelette ND, McGehee CD, Kohorst MA, Koh BD, Venkatachalam A, Meng XW, Schneider PA, Flatten KS, Peterson KL, Correia C, Lee SH, Patnaik M, Webster JA, Ghiaur G, Smith BD, Karp JE, Pratz KW, Li H, Karnitz LM, Kaufmann SH. CDK2-Mediated Upregulation of TNFα as a Mechanism of Selective Cytotoxicity in Acute Leukemia. Cancer Res 2021; 81:2666-2678. [PMID: 33414171 DOI: 10.1158/0008-5472.can-20-1504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 11/21/2020] [Accepted: 01/04/2021] [Indexed: 11/16/2022]
Abstract
Although inhibitors of the kinases CHK1, ATR, and WEE1 are undergoing clinical testing, it remains unclear how these three classes of agents kill susceptible cells and whether they utilize the same cytotoxic mechanism. Here we observed that CHK1 inhibition induces apoptosis in a subset of acute leukemia cell lines in vitro, including TP53-null acute myeloid leukemia (AML) and BCR/ABL-positive acute lymphoid leukemia (ALL), and inhibits leukemic colony formation in clinical AML samples ex vivo. In further studies, downregulation or inhibition of CHK1 triggered signaling in sensitive human acute leukemia cell lines that involved CDK2 activation followed by AP1-dependent TNF transactivation, TNFα production, and engagement of a TNFR1- and BID-dependent apoptotic pathway. AML lines that were intrinsically resistant to CHK1 inhibition exhibited high CHK1 expression and were sensitized by CHK1 downregulation. Signaling through this same CDK2-AP1-TNF cytotoxic pathway was also initiated by ATR or WEE1 inhibitors in vitro and during CHK1 inhibitor treatment of AML xenografts in vivo. Collectively, these observations not only identify new contributors to the antileukemic cell action of CHK1, ATR, and WEE1 inhibitors, but also delineate a previously undescribed pathway leading from aberrant CDK2 activation to death ligand-induced killing that can potentially be exploited for acute leukemia treatment. SIGNIFICANCE: This study demonstrates that replication checkpoint inhibitors can kill AML cells through a pathway involving AP1-mediated TNF gene activation and subsequent TP53-independent, TNFα-induced apoptosis, which can potentially be exploited clinically.
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Affiliation(s)
- Husheng Ding
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota. .,Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Nicole D Vincelette
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
| | - Cordelia D McGehee
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
| | - Mira A Kohorst
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota
| | - Brian D Koh
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Annapoorna Venkatachalam
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
| | - X Wei Meng
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota.,Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | | | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Kevin L Peterson
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Cristina Correia
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Sun-Hee Lee
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Mrinal Patnaik
- Division of Hematology, Mayo Clinic, Rochester, Minnesota
| | | | - Gabriel Ghiaur
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, Maryland
| | - B Douglas Smith
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, Maryland
| | - Judith E Karp
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, Maryland
| | - Keith W Pratz
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, Maryland
| | - Hu Li
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
| | - Larry M Karnitz
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota.,Division of Oncology Research, Mayo Clinic, Rochester, Minnesota
| | - Scott H Kaufmann
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota. .,Division of Oncology Research, Mayo Clinic, Rochester, Minnesota.,Division of Hematology, Mayo Clinic, Rochester, Minnesota
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10
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Vincelette ND, Ding H, Huehls AM, Flatten KS, Kelly RL, Kohorst MA, Webster J, Hess AD, Pratz KW, Karnitz LM, Kaufmann SH. Effect of CHK1 Inhibition on CPX-351 Cytotoxicity in vitro and ex vivo. Sci Rep 2019; 9:3617. [PMID: 30837643 PMCID: PMC6400938 DOI: 10.1038/s41598-019-40218-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 10/24/2018] [Accepted: 02/11/2019] [Indexed: 12/23/2022] Open
Abstract
CPX-351 is a liposomally encapsulated 5:1 molar ratio of cytarabine and daunorubicin that recently received regulatory approval for the treatment of therapy-related acute myeloid leukemia (AML) or AML with myelodysplasia-related changes based on improved overall survival compared to standard cytarabine/daunorubicin therapy. Checkpoint kinase 1 (CHK1), which is activated by DNA damage and replication stress, diminishes sensitivity to cytarabine and anthracyclines as single agents, suggesting that CHK1 inhibitors might increase the effectiveness of CPX-351. The present studies show that CPX-351 activates CHK1 as well as the S and G2/M cell cycle checkpoints. Conversely, CHK1 inhibition diminishes the cell cycle effects of CPX-351. Moreover, CHK1 knockdown or addition of a CHK1 inhibitor such as MK-8776, rabusertib or prexasertib enhances CPX-351-induced apoptosis in multiple TP53-null and TP53-wildtype AML cell lines. Likewise, CHK1 inhibition increases the antiproliferative effect of CPX-351 on primary AML specimens ex vivo, offering the possibility that CPX-351 may be well suited to combine with CHK1-targeted agents.
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Affiliation(s)
| | - Husheng Ding
- Division of Oncology Research, Mayo Clinic, Rochester, MN, USA
| | - Amelia M Huehls
- Division of Oncology Research, Mayo Clinic, Rochester, MN, USA
| | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, MN, USA
| | - Rebecca L Kelly
- Department of Molecular Pharmacology, Mayo Clinic, Rochester, MN, USA
| | - Mira A Kohorst
- Department of Pediatrics, Mayo Clinic, Rochester, MN, USA
| | - Jonathan Webster
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, USA
| | - Allan D Hess
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, USA
| | - Keith W Pratz
- Sidney Kimmel Cancer Center at Johns Hopkins, Baltimore, MD, USA
| | - Larry M Karnitz
- Department of Molecular Pharmacology, Mayo Clinic, Rochester, MN, USA. .,Division of Oncology Research, Mayo Clinic, Rochester, MN, USA.
| | - Scott H Kaufmann
- Department of Molecular Pharmacology, Mayo Clinic, Rochester, MN, USA. .,Division of Oncology Research, Mayo Clinic, Rochester, MN, USA.
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11
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Hurley RM, Wahner Hendrickson AE, Visscher DW, Ansell P, Harrell MI, Wagner JM, Negron V, Goergen KM, Maurer MJ, Oberg AL, Meng XW, Flatten KS, De Jonge MJA, Van Herpen CD, Gietema JA, Koornstra RHT, Jager A, den Hollander MW, Dudley M, Shepherd SP, Swisher EM, Kaufmann SH. 53BP1 as a potential predictor of response in PARP inhibitor-treated homologous recombination-deficient ovarian cancer. Gynecol Oncol 2019. [PMID: 30686551 DOI: 10.1016/j.ygyno.2019.01.015]+[] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Poly(ADP-ribose) polymerase (PARP) inhibitors have shown substantial activity in homologous recombination- (HR-) deficient ovarian cancer and are undergoing testing in other HR-deficient tumors. For reasons that are incompletely understood, not all patients with HR-deficient cancers respond to these agents. Preclinical studies have demonstrated that changes in alternative DNA repair pathways affect PARP inhibitor (PARPi) sensitivity in ovarian cancer models. This has not previously been assessed in the clinical setting. METHODS Clonogenic and plasmid-based HR repair assays were performed to compare BRCA1-mutant COV362 ovarian cancer cells with or without 53BP1 gene deletion. Archival biopsies from ovarian cancer patients in the phase I, open-label clinical trial of PARPi ABT-767 were stained for PARP1, RAD51, 53BP1 and multiple components of the nonhomologous end-joining (NHEJ) DNA repair pathway. Modified histochemistry- (H-) scores were determined for each repair protein in each sample. HRD score was determined from tumor DNA. RESULTS 53BP1 deletion increased HR in BRCA1-mutant COV362 cells and decreased PARPi sensitivity in vitro. In 36 women with relapsed ovarian cancer, responses to the PARPi ABT-767 were observed exclusively in cancers with HR deficiency. In this subset, 7 of 18 patients (39%) had objective responses. The actual HRD score did not further correlate with change from baseline tumor volume (r = 0.050; p = 0.87). However, in the HR-deficient subset, decreased 53BP1 H-score was associated with decreased antitumor efficacy of ABT-767 (r = -0.69, p = 0.004). CONCLUSION Differences in complementary repair pathways, particularly 53BP1, correlate with PARPi response of HR-deficient ovarian cancers.
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Affiliation(s)
- Rachel M Hurley
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States of America
| | | | - Daniel W Visscher
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, United States of America
| | - Peter Ansell
- Abbvie, North Chicago, IL, United States of America
| | - Maria I Harrell
- Department of Obstetrics and Gynecology, Univ. of Washington, Seattle, WA, United States of America
| | - Jill M Wagner
- Department of Oncology, Mayo Clinic, Rochester, MN, United States of America
| | - Vivian Negron
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, United States of America
| | - Krista M Goergen
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States of America
| | - Matthew J Maurer
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States of America
| | - Ann L Oberg
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States of America
| | - X Wei Meng
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States of America
| | - Karen S Flatten
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States of America
| | | | | | | | | | - Agnes Jager
- Erasmus Medical Center Cancer Institute, Rotterdam, the Netherlands
| | | | | | | | - Elizabeth M Swisher
- Department of Obstetrics and Gynecology, Univ. of Washington, Seattle, WA, United States of America
| | - Scott H Kaufmann
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN, United States of America; Department of Oncology, Mayo Clinic, Rochester, MN, United States of America.
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12
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Hurley RM, Nesic K, McGehee C, Kondrashova O, Harrell MI, Schneider PA, Hou X, Correia C, Flatten KS, Zapparoli GV, Dobrovic A, Lin KK, Harding TC, Hendrickson AEW, Swisher EM, Wakefield M, Weroha SJ, Scott CL, Kaufmann SH. Abstract 5885: Loss of RAD51C promoter hypermethylation confers PARP inhibitor resistance. Cancer Res 2018. [DOI: 10.1158/1538-7445.am2018-5885] [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
Background: Acquired PARP inhibitor (PARPi) resistance in high-grade serous ovarian cancer (HGSOC) as a result of restored homologous recombination has been observed following secondary mutations that restore full-length protein in BRCA1, BRCA2, RAD51C, and RAD51D. Additionally, loss of BRCA1 methylation has also been shown to confer resistance. However, little is known about the role of RAD51C methylation in acquired PARPi resistance. In ARIEL2 Part 1, a phase 2 study of the PARPi rucaparib in ovarian carcinoma, four (2%) tumors demonstrated RAD51C methylation. The present study utilizes HGSOC patient derived xenografts (PDXs) and recurrent samples from ARIEL2 to assess the role of RAD51C methylation in the development of PARPi resistance.
Methods: To drive PARPi resistance, PDX039, an extremely PARPi-sensitive model lacking demonstrable mutations in DNA repair genes, was treated cyclically with niraparib (100 mg/kg) for 21 days, after which the tumor was allowed to regrow and re-established in new mice for the next treatment round. To evaluate the frequency of methylation change, RAD51C methylation was analyzed in 12 rucaparib-treated mice (300 or 450 mg/kg) harboring PDX183, a PARPi-sensitive model without mutations in DNA repair genes. Global changes in gene expression following development of PARPi resistance were assessed by RNA sequencing. RAD51C promoter methylation was evaluated by bisulfite sequencing. Subsequent functional analysis included qRT-PCR, IHC, and western blot. DNA damage response pathways are being evaluated by immunofluorescence ex vivo following niraparib, rucaparib, or IR.
Results: PDX039 grew through PARPi treatment by the third and fourth cycle of therapy. RAD51C was the only DNA repair gene to show significant change in RNAseq analysis (log2 fold-change=8.43; p=2e-192), corresponding with a loss of RAD51C methylation. Moreover, after just one round of PARPi treatment, RAD51C methylation was lost in 1 of 12 PARPi-treated PDX183 xenografts. RAD51C methylation loss ultimately resulted in restoration of expression, for which functional analysis is ongoing. Analysis of patient samples is currently underway.
Conclusions: In HGSOC PDX models, RAD51C methylation affords PARPi sensitivity in the absence of DNA repair gene mutations. Treatment pressure with PARPi can reverse RAD51C methylation and restore RAD51C expression. Isolated changes in methylation of the RAD51C locus are sufficient to restore HR and convey PARPi resistance.
Citation Format: Rachel M. Hurley, Ksenija Nesic, Cordelia McGehee, Olga Kondrashova, Maria I. Harrell, Paula A. Schneider, Xiaonan Hou, Cristina Correia, Karen S. Flatten, Giada V. Zapparoli, Alexander Dobrovic, Kevin K. Lin, Thomas C. Harding, Andrea E. Wahner Hendrickson, Elizabeth M. Swisher, Matthew Wakefield, S. John Weroha, Clare L. Scott, Scott H. Kaufmann. Loss of RAD51C promoter hypermethylation confers PARP inhibitor resistance [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 5885.
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Affiliation(s)
| | - Ksenija Nesic
- 2The Walter and Eliza Hall Institute, Melbourne, Australia
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Clare L. Scott
- 2The Walter and Eliza Hall Institute, Melbourne, Australia
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13
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Wahner Hendrickson AE, Menefee ME, Hartmann LC, Long HJ, Northfelt DW, Reid JM, Boakye-Agyeman F, Kayode O, Flatten KS, Harrell MI, Swisher EM, Poirier GG, Satele D, Allred J, Lensing JL, Chen A, Ji J, Zang Y, Erlichman C, Haluska P, Kaufmann SH. A Phase I Clinical Trial of the Poly(ADP-ribose) Polymerase Inhibitor Veliparib and Weekly Topotecan in Patients with Solid Tumors. Clin Cancer Res 2018; 24:744-752. [PMID: 29138343 PMCID: PMC7580251 DOI: 10.1158/1078-0432.ccr-17-1590] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 10/03/2017] [Accepted: 11/08/2017] [Indexed: 12/27/2022]
Abstract
Purpose: To determine the dose limiting toxicities (DLT), maximum tolerated dose (MTD), and recommended phase II dose (RP2D) of veliparib in combination with weekly topotecan in patients with solid tumors. Correlative studies were included to assess the impact of topotecan and veliparib on poly(ADP-ribose) levels in peripheral blood mononuclear cells, serum pharmacokinetics of both agents, and potential association of germline repair gene mutations with outcome.Experimental Design: Eligible patients had metastatic nonhematologic malignancies with measurable disease. Using a 3 + 3 design, patients were treated with veliparib orally twice daily on days 1-3, 8-10, and 15-17 and topotecan intravenously on days 2, 9, and 16 every 28 days. Tumor responses were assessed by RECIST.Results: Of 58 patients enrolled, 51 were evaluable for the primary endpoint. The MTD and RP2D was veliparib 300 mg twice daily on days 1-3, 8-10, and 15-17 along with topotecan 3 mg/m2 on days 2, 9, and 16 of a 28-day cycle. DLTs were grade 4 neutropenia lasting >5 days. The median number of cycles was 2 (1-26). The objective response rate was 10%, with 1 complete and 4 partial responses. Twenty-two patients (42%) had stable disease ranging from 4 to 26 cycles. Patients with germline BRCA1, BRCA2, or RAD51D mutations remained on study longer than those without homologous recombination repair (HRR) gene mutations (median 4 vs. 2 cycles).Conclusions: Weekly topotecan in combination with veliparib has a manageable safety profile and appears to warrant further investigation. Clin Cancer Res; 24(4); 744-52. ©2017 AACR.
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14
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Perkins AL, Peterson KL, Beito TG, Flatten KS, Kaufmann SH, Harki DA. Synthesis of a peptide-universal nucleotide antigen: towards next-generation antibodies to detect topoisomerase I-DNA covalent complexes. Org Biomol Chem 2018; 14:4103-9. [PMID: 27113574 DOI: 10.1039/c5ob02049b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The topoisomerase (topo) I-DNA covalent complex represents an attractive target for developing diagnostic antibodies to measure responsiveness to drugs. We report a new antigen, peptide , and four murine monoclonal antibodies raised against that exhibit excellent specificity for recognition of in comparison to structurally similar peptides by enzyme-linked immunosorbent assays. Although topo I-DNA complex detection was not achieved in cellular samples by these new antibodies, a new strategy for antigen design is reported.
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Affiliation(s)
- Angela L Perkins
- Department of Medicinal Chemistry, University of Minnesota, 2231 6th Street SE, Minneapolis, MN 55455, USA.
| | - Kevin L Peterson
- Division of Oncology Research, Mayo Clinic, 200 First St., S.W., Rochester, MN 55905, USA
| | - Thomas G Beito
- Monoclonal Antibody Core, Mayo Clinic, 200 First St., S.W., Rochester, MN 55905, USA
| | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, 200 First St., S.W., Rochester, MN 55905, USA
| | - Scott H Kaufmann
- Division of Oncology Research, Mayo Clinic, 200 First St., S.W., Rochester, MN 55905, USA
| | - Daniel A Harki
- Department of Medicinal Chemistry, University of Minnesota, 2231 6th Street SE, Minneapolis, MN 55455, USA.
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15
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Maskey RS, Flatten KS, Sieben CJ, Peterson KL, Baker DJ, Nam HJ, Kim MS, Smyrk TC, Kojima Y, Machida Y, Santiago A, van Deursen JM, Kaufmann SH, Machida YJ. Spartan deficiency causes accumulation of Topoisomerase 1 cleavage complexes and tumorigenesis. Nucleic Acids Res 2017; 45:4564-4576. [PMID: 28199696 PMCID: PMC5416836 DOI: 10.1093/nar/gkx107] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [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: 11/21/2016] [Accepted: 02/06/2017] [Indexed: 11/30/2022] Open
Abstract
Germline mutations in SPRTN cause Ruijs–Aalfs syndrome (RJALS), a disorder characterized by genome instability, progeria and early onset hepatocellular carcinoma. Spartan, the protein encoded by SPRTN, is a nuclear metalloprotease that is involved in the repair of DNA–protein crosslinks (DPCs). Although Sprtn hypomorphic mice recapitulate key progeroid phenotypes of RJALS, whether this model expressing low amounts of Spartan is prone to DPC repair defects and spontaneous tumors is unknown. Here, we showed that the livers of Sprtn hypomorphic mice accumulate DPCs containing Topoisomerase 1 covalently linked to DNA. Furthermore, these mice exhibited DNA damage, aneuploidy and spontaneous tumorigenesis in the liver. Collectively, these findings provide evidence that partial loss of Spartan impairs DPC repair and tumor suppression.
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Affiliation(s)
- Reeja S Maskey
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Karen S Flatten
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Cynthia J Sieben
- Department of Biochemistry and Molecular Biology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Kevin L Peterson
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Darren J Baker
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Hyun-Ja Nam
- Department of Pediatric and Adolescent Medicine, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Myoung Shin Kim
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Thomas C Smyrk
- Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Yusuke Kojima
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Yuka Machida
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Annyoceli Santiago
- Department of Biochemistry and Molecular Biology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Jan M van Deursen
- Department of Biochemistry and Molecular Biology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Scott H Kaufmann
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA.,Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
| | - Yuichi J Machida
- Department of Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA.,Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, USA
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16
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AlHilli MM, Becker MA, Weroha SJ, Flatten KS, Hurley RM, Harrell MI, Oberg AL, Maurer MJ, Hawthorne KM, Hou X, Harrington SC, McKinstry S, Meng XW, Wilcoxen KM, Kalli KR, Swisher EM, Kaufmann SH, Haluska P. In vivo anti-tumor activity of the PARP inhibitor niraparib in homologous recombination deficient and proficient ovarian carcinoma. Gynecol Oncol 2016; 143:379-388. [PMID: 27614696 PMCID: PMC5370566 DOI: 10.1016/j.ygyno.2016.08.328] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/17/2016] [Accepted: 08/22/2016] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Poly(ADP-ribose) polymerase (PARP) inhibitors have yielded encouraging responses in high-grade serous ovarian carcinomas (HGSOCs), but the optimal treatment setting remains unknown. We assessed the effect of niraparib on HGSOC patient-derived xenograft (PDX) models as well as the relationship between certain markers of homologous recombination (HR) status, including BRCA1/2 mutations and formation of RAD51 foci after DNA damage, and response of these PDXs to niraparib in vivo. METHODS Massively parallel sequencing was performed on HGSOCs to identify mutations contributing to HR deficiency. HR pathway integrity was assessed using fluorescence microscopy-based RAD51 focus formation assays. Effects of niraparib (MK-4827) on treatment-naïve PDX tumor growth as monotherapy, in combination with carboplatin/paclitaxel, and as maintenance therapy were assessed by transabdominal ultrasound. Niraparib responses were correlated with changes in levels of poly(ADP-ribose), PARP1, and repair proteins by western blotting. RESULTS Five PDX models were evaluated in vivo. Tumor regressions were induced by single-agent niraparib in one of two PDX models with deleterious BRCA2 mutations and in a PDX with RAD51C promoter methylation. Diminished formation of RAD51 foci failed to predict response, but Artemis loss was associated with resistance. Niraparib generally failed to enhance responses to carboplatin/paclitaxel chemotherapy, but maintenance niraparib therapy delayed progression in a BRCA2-deficient PDX. CONCLUSIONS Mutations in HR genes are neither necessary nor sufficient to predict response to niraparib. Assessment of repair status through multiple complementary assays is needed to guide PARP inhibitor therapy, design future clinical trials and identify ovarian cancer patients most likely to benefit from PARP inhibition.
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Affiliation(s)
- Mariam M AlHilli
- Division of Gynecologic Surgery, Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, MN, United States
| | - Marc A Becker
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | - S John Weroha
- Department of Oncology, Mayo Clinic, Rochester, MN, United States.
| | - Karen S Flatten
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | - Rachel M Hurley
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | - Maria I Harrell
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Ann L Oberg
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States
| | - Matt J Maurer
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States
| | - Kieran M Hawthorne
- Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, MN, United States
| | - Xiaonan Hou
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | | | - Sarah McKinstry
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | - X Wei Meng
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | | | - Kimberly R Kalli
- Department of Oncology, Mayo Clinic, Rochester, MN, United States
| | - Elizabeth M Swisher
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Scott H Kaufmann
- Department of Oncology, Mayo Clinic, Rochester, MN, United States; Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, United States
| | - Paul Haluska
- Department of Oncology, Mayo Clinic, Rochester, MN, United States; Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, United States
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17
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Pratz KW, Koh BD, Patel AG, Flatten KS, Poh W, Herman JG, Dilley R, Harrell MI, Smith BD, Karp JE, Swisher EM, McDevitt MA, Kaufmann SH. Poly (ADP-Ribose) Polymerase Inhibitor Hypersensitivity in Aggressive Myeloproliferative Neoplasms. Clin Cancer Res 2016; 22:3894-902. [PMID: 26979391 DOI: 10.1158/1078-0432.ccr-15-2351] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 02/29/2016] [Indexed: 01/31/2023]
Abstract
PURPOSE DNA repair defects have been previously reported in myeloproliferative neoplasms (MPN). Inhibitors of PARP have shown activity in solid tumors with defects in homologous recombination (HR). This study was performed to assess MPN sensitivity to PARP inhibitors ex vivo EXPERIMENTAL DESIGN HR pathway integrity in circulating myeloid cells was evaluated by assessing the formation of RAD51 foci after treatment with ionizing radiation or PARP inhibitors. Sensitivity of MPN erythroid and myeloid progenitors to PARP inhibitors was evaluated using colony formation assays. RESULTS Six of 14 MPN primary samples had reduced formation of RAD51 foci after exposure to ionizing radiation, suggesting impaired HR. This phenotype was not associated with a specific MPN subtype, JAK2 mutation status, or karyotype. MPN samples showed increased sensitivity to the PARP inhibitors veliparib and olaparib compared with normal myeloid progenitors. This hypersensitivity, which was most pronounced in samples deficient in DNA damage-induced RAD51 foci, was observed predominantly in samples from patients with diagnoses of chronic myelogenous leukemia, chronic myelomonocytic leukemia, or unspecified myelodysplastic/MPN overlap syndromes. CONCLUSIONS Like other neoplasms with HR defects, MPNs exhibit PARP inhibitor hypersensitivity compared with normal marrow. These results suggest that further preclinical and possibly clinical study of PARP inhibitors in MPNs is warranted. Clin Cancer Res; 22(15); 3894-902. ©2016 AACR.
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Affiliation(s)
- Keith W Pratz
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland.
| | - Brian D Koh
- Department of Oncology, Mayo Clinic, Rochester, Minnesota
| | - Anand G Patel
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
| | | | - Weijie Poh
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland
| | - James G Herman
- Division of Hematology/Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania
| | - Robert Dilley
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland
| | - Maria I Harrell
- Department of Obstetrics & Gynecology, University of Washington School of Medicine, Seattle, Washington
| | - B Douglas Smith
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland
| | - Judith E Karp
- Department of Oncology and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland
| | - Elizabeth M Swisher
- Department of Obstetrics & Gynecology, University of Washington School of Medicine, Seattle, Washington
| | - Michael A McDevitt
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Scott H Kaufmann
- Department of Oncology, Mayo Clinic, Rochester, Minnesota. Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota
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18
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Patel AG, Flatten KS, Peterson KL, Beito TG, Schneider PA, Perkins AL, Harki DA, Kaufmann SH. Immunodetection of human topoisomerase I-DNA covalent complexes. Nucleic Acids Res 2016; 44:2816-26. [PMID: 26917015 PMCID: PMC4824114 DOI: 10.1093/nar/gkw109] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [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: 11/02/2015] [Accepted: 02/15/2016] [Indexed: 12/29/2022] Open
Abstract
A number of established and investigational anticancer drugs slow the religation step of DNA topoisomerase I (topo I). These agents induce cytotoxicity by stabilizing topo I-DNA covalent complexes, which in turn interact with advancing replication forks or transcription complexes to generate lethal lesions. Despite the importance of topo I-DNA covalent complexes, it has been difficult to detect these lesions within intact cells and tumors. Here, we report development of a monoclonal antibody that specifically recognizes covalent topo I-DNA complexes, but not free topo I or DNA, by immunoblotting, immunofluorescence or flow cytometry. Utilizing this antibody, we demonstrate readily detectable topo I-DNA covalent complexes after treatment with camptothecins, indenoisoquinolines and cisplatin but not nucleoside analogues. Topotecan-induced topo I-DNA complexes peak at 15-30 min after drug addition and then decrease, whereas indotecan-induced complexes persist for at least 4 h. Interestingly, simultaneous staining for covalent topo I-DNA complexes, phospho-H2AX and Rad51 suggests that topotecan-induced DNA double-strand breaks occur at sites distinct from stabilized topo I-DNA covalent complexes. These studies not only provide new insight into the action of topo I-directed agents, but also illustrate a strategy that can be applied to study additional topoisomerases and their inhibitors in vitro and in vivo.
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Affiliation(s)
- Anand G Patel
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, USA
| | - Karen S Flatten
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA
| | - Kevin L Peterson
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA
| | - Thomas G Beito
- Department of Immunology, Mayo Clinic, Rochester, MN 55905, USA
| | - Paula A Schneider
- Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA
| | - Angela L Perkins
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Daniel A Harki
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Scott H Kaufmann
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN 55905, USA Division of Oncology Research, Mayo Clinic, Rochester, MN 55905, USA
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19
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Wahner Hendrickson AE, Menefee ME, Hartmann LC, Long HJ, Northfelt DW, Reid JM, Boakye-Agyeman F, Flatten KS, Poirier GG, Lensing J, Erlichman C, Kaufmann SH, Haluska P. A phase I trial of veliparib, an inhibitor of poly(ADP-ribose) polymerase (PARP), and topotecan (TPT) in patients with solid tumors. J Clin Oncol 2015. [DOI: 10.1200/jco.2015.33.15_suppl.tps2618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
| | | | | | | | | | - Joel M. Reid
- Department of Oncology, Mayo Clinic, Rochester, MN
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20
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Meng XW, Koh BD, Zhang JS, Flatten KS, Schneider PA, Billadeau DD, Hess AD, Smith BD, Karp JE, Kaufmann SH. Poly(ADP-ribose) polymerase inhibitors sensitize cancer cells to death receptor-mediated apoptosis by enhancing death receptor expression. J Biol Chem 2014; 289:20543-58. [PMID: 24895135 PMCID: PMC4110268 DOI: 10.1074/jbc.m114.549220] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 05/30/2014] [Indexed: 12/21/2022] Open
Abstract
Recombinant human tumor necrosis factor-α-related apoptosis inducing ligand (TRAIL), agonistic monoclonal antibodies to TRAIL receptors, and small molecule TRAIL receptor agonists are in various stages of preclinical and early phase clinical testing as potential anticancer drugs. Accordingly, there is substantial interest in understanding factors that affect sensitivity to these agents. In the present study we observed that the poly(ADP-ribose) polymerase (PARP) inhibitors olaparib and veliparib sensitize the myeloid leukemia cell lines ML-1 and K562, the ovarian cancer line PEO1, non-small cell lung cancer line A549, and a majority of clinical AML isolates, but not normal marrow, to TRAIL. Further analysis demonstrated that PARP inhibitor treatment results in activation of the FAS and TNFRSF10B (death receptor 5 (DR5)) promoters, increased Fas and DR5 mRNA, and elevated cell surface expression of these receptors in sensitized cells. Chromatin immunoprecipitation demonstrated enhanced binding of the transcription factor Sp1 to the TNFRSF10B promoter in the presence of PARP inhibitor. Knockdown of PARP1 or PARP2 (but not PARP3 and PARP4) not only increased expression of Fas and DR5 at the mRNA and protein level, but also recapitulated the sensitizing effects of the PARP inhibition. Conversely, Sp1 knockdown diminished the PARP inhibitor effects. In view of the fact that TRAIL is part of the armamentarium of natural killer cells, these observations identify a new facet of PARP inhibitor action while simultaneously providing the mechanistic underpinnings of a novel therapeutic combination that warrants further investigation.
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Affiliation(s)
- X. Wei Meng
- From the Division of Oncology Research and
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota 55905 and
| | | | | | | | | | | | - Allan D. Hess
- the Sidney Kimmel Cancer Center at Johns Hopkins University, Baltimore, Maryland 21205
| | - B. Douglas Smith
- the Sidney Kimmel Cancer Center at Johns Hopkins University, Baltimore, Maryland 21205
| | - Judith E. Karp
- the Sidney Kimmel Cancer Center at Johns Hopkins University, Baltimore, Maryland 21205
| | - Scott H. Kaufmann
- From the Division of Oncology Research and
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota 55905 and
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21
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Gálvez-Peralta M, Flatten KS, Loegering DA, Peterson KL, Schneider PA, Erlichman C, Kaufmann SH. Context-dependent antagonism between Akt inhibitors and topoisomerase poisons. Mol Pharmacol 2014; 85:723-34. [PMID: 24569089 DOI: 10.1124/mol.113.088674] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Signaling through the phosphatidylinositol-3 kinase (PI3K)/Akt pathway, which is aberrantly activated in >50% of carcinomas, inhibits apoptosis and contributes to drug resistance. Accordingly, several Akt inhibitors are currently undergoing preclinical or early clinical testing. To examine the effect of Akt inhibition on the activity of multiple widely used classes of antineoplastic agents, human cancer cell lines were treated with the Akt inhibitor A-443654 [(2S)-1-(1H-indol-3-yl)-3-[5-(3-methyl-2H-indazol-5-yl)pyridin-3-yl]oxypropan-2-amine; ATP-competitive] or MK-2206 (8-[4-(1-aminocyclobutyl)phenyl]-9-phenyl-2H-[1,2,4]triazolo[3,4-f][1,6]naphthyridin-3-one;dihydrochloride; allosteric inhibitor) or with small interfering RNA (siRNA) targeting phosphoinositide-dependent kinase 1 (PDK1) along with cisplatin, melphalan, camptothecin, or etoposide and assayed for colony formation. Surprisingly different results were observed when Akt inhibitors were combined with different drugs. Synergistic effects were observed in multiple cell lines independent of PI3K pathway status when A-443654 or MK-2206 was combined with the DNA cross-linking agents cisplatin or melphalan. In contrast, effects of the Akt inhibitors in combination with camptothecin or etoposide were more complicated. In HCT116 and DLD1 cells, which harbor activating PI3KCA mutations, A-443654 over a broad concentration range enhanced the effects of camptothecin or etoposide. In contrast, in cell lines lacking activating PI3KCA mutations, partial inhibition of Akt signaling synergized with camptothecin or etoposide, but higher A-443654 or MK-2206 concentrations (>80% inhibition of Akt signaling) or PDK1 siRNA antagonized the topoisomerase poisons by diminishing DNA synthesis, a process that contributes to effective DNA damage and killing by these agents. These results indicate that the effects of combining inhibitors of the PI3K/Akt pathway with certain classes of chemotherapeutic agents might be more complicated than previously recognized.
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Affiliation(s)
- Marina Gálvez-Peralta
- Divisions of Oncology Research (M.G.-P., K.S.F., D.A.L., K.L.P., P.A.S., S.H.K.) and Medical Oncology (C.E.), Department of Oncology and Department of Molecular Pharmacology & Experimental Therapeutics (S.H.K.), Mayo Clinic College of Medicine, Rochester, Minnesota
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22
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Chaudhuri L, Vincelette ND, Koh BD, Naylor RM, Flatten KS, Peterson KL, McNally A, Gojo I, Karp JE, Mesa RA, Sproat LO, Bogenberger JM, Kaufmann SH, Tibes R. CHK1 and WEE1 inhibition combine synergistically to enhance therapeutic efficacy in acute myeloid leukemia ex vivo. Haematologica 2013; 99:688-96. [PMID: 24179152 DOI: 10.3324/haematol.2013.093187] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Novel combinations targeting new molecular vulnerabilities are needed to improve the outcome of patients with acute myeloid leukemia. We recently identified WEE1 kinase as a novel target in leukemias. To identify genes that are synthetically lethal with WEE1 inhibition, we performed a short interfering RNA screen directed against cell cycle and DNA repair genes during concurrent treatment with the WEE1 inhibitor MK1775. CHK1 and ATR, genes encoding two replication checkpoint kinases, were among the genes whose silencing enhanced the effects of WEE1 inhibition most, whereas CDK2 short interfering RNA antagonized MK1775 effects. Building on this observation, we examined the impact of combining MK1775 with selective small molecule inhibitors of CHK1, ATR and cyclin-dependent kinases. The CHK1 inhibitor MK8776 sensitized acute myeloid leukemia cell lines and primary leukemia specimens to MK1775 ex vivo, whereas smaller effects were observed with the MK1775/MK8776 combination in normal myeloid progenitors. The ATR inhibitor VE-821 likewise enhanced the antiproliferative effects of MK1775, whereas the cyclin-dependent kinase inhibitor roscovitine antagonized MK1775. Further studies showed that MK8776 enhanced MK1775-mediated activation of the ATR/CHK1 pathway in acute leukemia cell lines and ex vivo. These results indicate that combined cell cycle checkpoint interference with MK1775/MK8776 warrants further investigation as a potential treatment for acute myeloid leukemia.
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23
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Ding H, McDonald JS, Yun S, Schneider PA, Peterson KL, Flatten KS, Loegering DA, Oberg AL, Riska SM, Huang S, Sinicrope FA, Adjei AA, Karp JE, Meng XW, Kaufmann SH. Farnesyltransferase inhibitor tipifarnib inhibits Rheb prenylation and stabilizes Bax in acute myelogenous leukemia cells. Haematologica 2013; 99:60-9. [PMID: 23996484 DOI: 10.3324/haematol.2013.087734] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Although farnesyltransferase inhibitors have shown promising activity in relapsed lymphoma and sporadic activity in acute myelogenous leukemia, their mechanism of cytotoxicity is incompletely understood, making development of predictive biomarkers difficult. In the present study, we examined the action of tipifarnib in human acute myelogenous leukemia cell lines and clinical samples. In contrast to the Ras/MEK/ERK pathway-mediated Bim upregulation that is responsible for tipifarnib-induced killing of malignant lymphoid cells, inhibition of Rheb-induced mTOR signaling followed by dose-dependent upregulation of Bax and Puma occurred in acute myelogenous leukemia cell lines undergoing tipifarnib-induced apoptosis. Similar Bax and Puma upregulation occurred in serial bone marrow samples harvested from a subset of acute myelogenous leukemia patients during tipifarnib treatment. Expression of FTI-resistant Rheb M184L, like knockdown of Bax or Puma, diminished tipifarnib-induced killing. Further analysis demonstrated that increased Bax and Puma levels reflect protein stabilization rather than increased gene expression. In U937 cells selected for tipifarnib resistance, neither inhibition of signaling downstream of Rheb nor Bax and Puma stabilization occurred. Collectively, these results not only identify a pathway downstream from Rheb that contributes to tipifarnib cytotoxicity in human acute myelogenous leukemia cells, but also demonstrate that FTI-induced killing of lymphoid versus myeloid cells reflects distinct biochemical mechanisms downstream of different farnesylated substrates. (ClinicalTrials.gov identifier NCT00602771).
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24
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Huntoon CJ, Flatten KS, Wahner Hendrickson AE, Huehls AM, Sutor SL, Kaufmann SH, Karnitz LM. ATR inhibition broadly sensitizes ovarian cancer cells to chemotherapy independent of BRCA status. Cancer Res 2013; 73:3683-91. [PMID: 23548269 DOI: 10.1158/0008-5472.can-13-0110] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [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: 12/22/2022]
Abstract
Replication stress and DNA damage activate the ATR-Chk1 checkpoint signaling pathway that licenses repair and cell survival processes. In this study, we examined the respective roles of the ATR and Chk1 kinases in ovarian cancer cells using genetic and pharmacologic inhibitors in combination with cisplatin, topotecan, gemcitabine, and the PARP inhibitor veliparib (ABT-888), four agents with clinical activity in ovarian cancer. RNA interference (RNAi)-mediated depletion or inhibition of ATR sensitized ovarian cancer cells to all four agents. In contrast, while cisplatin, topotecan, and gemcitabine each activated Chk1, RNAi-mediated depletion or inhibition of this kinase in cells sensitized them only to gemcitabine. Unexpectedly, we found that neither the ATR kinase inhibitor VE-821 nor the Chk1 inhibitor MK-8776 blocked ATR-mediated Chk1 phosphorylation or autophosphorylation, two commonly used readouts for inhibition of the ATR-Chk1 pathway. Instead, their ability to sensitize cells correlated with enhanced CDC25A levels. In addition, we also found that VE-821 could further sensitize BRCA1-depleted cells to cisplatin, topotecan, and veliparib beyond the potent sensitization already caused by their deficiency in homologous recombination. Taken together, our results established that ATR and Chk1 inhibitors differentially sensitize ovarian cancer cells to commonly used chemotherapy agents and that Chk1 phosphorylation status may not offer a reliable marker for inhibition of the ATR-Chk1 pathway. A key implication of our work is the clinical rationale it provides to evaluate ATR inhibitors in combination with PARP inhibitors in BRCA1/2-deficient cells.
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Affiliation(s)
- Catherine J Huntoon
- Divisions of Oncology Research and Medical Oncology, and Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic College of Medicine, Mayo Clinic, Rochester, MN 55905, USA
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25
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Karp JE, Thomas BM, Greer JM, Sorge C, Gore SD, Pratz KW, Smith BD, Flatten KS, Peterson K, Schneider P, Mackey K, Freshwater T, Levis MJ, McDevitt MA, Carraway HE, Gladstone DE, Showel MM, Loechner S, Parry DA, Horowitz JA, Isaacs R, Kaufmann SH. Phase I and pharmacologic trial of cytosine arabinoside with the selective checkpoint 1 inhibitor Sch 900776 in refractory acute leukemias. Clin Cancer Res 2012; 18:6723-31. [PMID: 23092873 DOI: 10.1158/1078-0432.ccr-12-2442] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
PURPOSE Incorporation of cytarabine into DNA activates checkpoint kinase 1 (Chk1), which stabilizes stalled replication forks, induces S-phase slowing, and diminishes cytarabine cytotoxicity. The selective Chk1 inhibitor SCH 900776 abrogates cytarabine-induced S-phase arrest and enhances cytarabine cytotoxicity in acute leukemia cell lines and leukemic blasts in vitro. To extend these findings to the clinical setting, we have conducted a phase I study of cytarabine and SCH 900776. EXPERIMENTAL DESIGN Twenty-four adults with relapsed and refractory acute leukemias received timed sequential, continuous infusion cytarabine 2 g/m(2) over 72 hours (667 mg/m(2)/24 hours) beginning on day 1 and again on day 10. SCH 900776 was administered as a 15- to 30-minute infusion on days 2, 3, 11, and 12. The starting dose of SCH 900776 was 10 mg/m(2)/dose. RESULTS Dose-limiting toxicities consisting of corrected QT interval prolongation and grade 3 palmar-plantar erythrodysesthesia occurred at 140 mg flat dosing (dose level 5, equivalent to 80 mg/m(2)). Complete remissions occurred in 8 of 24 (33%) patients, with 7 of 8 at 40 mg/m(2) or higher. SCH 900776 did not accumulate at any dose level. Marrow blasts obtained pretreatment and during therapy showed increased phosphorylation of H2Ax after SCH 900776 beginning at 40 mg/m(2), consistent with unrepaired DNA damage. CONCLUSIONS These data support a randomized phase II trial of cytarabine +/- SCH 900776 at a recommended flat dose of 100 mg (equivalent to 56 mg/m(2)) for adults with poor-risk leukemias. The trial (SP P05247) was registered at www.clinicaltrials.gov as NCT00907517.
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Affiliation(s)
- Judith E Karp
- Division of Hematologic Malignancies, Johns Hopkins Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins Hospital, Baltimore, Maryland 21287, USA.
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Schenk EL, Koh BD, Flatten KS, Peterson KL, Parry D, Hess AD, Smith BD, Karp JE, Karnitz LM, Kaufmann SH. Effects of selective checkpoint kinase 1 inhibition on cytarabine cytotoxicity in acute myelogenous leukemia cells in vitro. Clin Cancer Res 2012; 18:5364-73. [PMID: 22869869 DOI: 10.1158/1078-0432.ccr-12-0961] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE Previous studies have shown that the replication checkpoint, which involves the kinases ataxia telangiectasia mutated and Rad3 related (ATR) and Chk1, contributes to cytarabine resistance in cell lines. In the present study, we examined whether this checkpoint is activated in clinical acute myelogenous leukemia (AML) during cytarabine infusion in vivo and then assessed the impact of combining cytarabine with the recently described Chk1 inhibitor SCH 900776 in vitro. EXPERIMENTAL DESIGN AML marrow aspirates harvested before and during cytarabine infusion were examined by immunoblotting. Human AML lines treated with cytarabine in the absence or presence of SCH 900776 were assayed for checkpoint activation by immunoblotting, nucleotide incorporation into DNA, and flow cytometry. Long-term effects in AML lines, clinical AML isolates, and normal myeloid progenitors were assayed using clonogenic assays. RESULTS Immunoblotting revealed increased Chk1 phosphorylation, a marker of checkpoint activation, in more than half of Chk1-containing AMLs after 48 hours of cytarabine infusion. In human AML lines, SCH 900776 not only disrupted cytarabine-induced Chk1 activation and S-phase arrest but also markedly increased cytarabine-induced apoptosis. Clonogenic assays demonstrated that SCH 900776 enhanced the antiproliferative effects of cytarabine in AML cell lines and clinical AML samples at concentrations that had negligible impact on normal myeloid progenitors. CONCLUSIONS These results not only provide evidence for cytarabine-induced S-phase checkpoint activation in AML in the clinical setting, but also show that a selective Chk1 inhibitor can overcome the S-phase checkpoint and enhance the cytotoxicity of cytarabine. Accordingly, further investigation of the cytarabine/SCH 900776 combination in AML appears warranted.
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Affiliation(s)
- Erin L Schenk
- Department of Oncology, Mayo Clinic, Rochester, MN, USA
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Lee SH, Meng XW, Flatten KS, Loegering DA, Kaufmann SH. Phosphatidylserine exposure during apoptosis reflects bidirectional trafficking between plasma membrane and cytoplasm. Cell Death Differ 2012; 20:64-76. [PMID: 22858544 DOI: 10.1038/cdd.2012.93] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Phosphatidylserine (PS) exposure on the external leaflet of the plasma membrane is widely observed during apoptosis and forms the basis for the annexin V binding assay to detect apoptotic cell death. Current efforts to explain PS exposure focus on two potential mechanisms, activation of a phospholipid scramblase or calcium-mediated trafficking of lysosomes to the cell surface. Here, we provide evidence that apoptotic PS exposure instead reflects bidirectional trafficking of membrane between the cell surface and cytoplasm. Using a series of cell lines, some of which expose large amounts of PS during apoptosis and some of which do not, we demonstrate that accumulation of plasma membrane-derived cytoplasmic vesicles in a dynamin-, clathrin- and Cdc42-independent manner is a previously undescribed but widely occurring feature of apoptosis. The apoptotic exposure of PS occurs when these vesicles traffic back to cell surface in a calcium-dependent process that is deficient in a substantial fraction of human cancer cell lines. These observations provide a new model for PS externalization during apoptosis and simultaneously identify an altered step that accounts for the paucity of apoptotic PS exposure in many cell lines.
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Affiliation(s)
- S-H Lee
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, MN 55905, USA
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Abstract
PURPOSE Poly(ADP-ribose) polymerase (PARP) inhibitors are undergoing extensive clinical testing for their single-agent activity in homologous recombination (HR)-deficient tumors and ability to enhance the action of certain DNA-damaging agents. Compared with other PARP inhibitors in development, iniparib (4-iodo-3-nitrobenzamide) is notable for its simple structure and the reported ability of its intracellular metabolite 4-iodo-3-nitrosobenzamide to covalently inhibit PARP1 under cell-free conditions. The present preclinical studies were conducted to compare the actions iniparib with the more extensively characterized PARP inhibitors olaparib and veliparib. EXPERIMENTAL DESIGN The abilities of iniparib, olaparib, and veliparib to (i) selectively induce apoptosis or inhibit colony formation in HR-deficient cell lines, (ii) selectively sensitize HR-proficient cells to topoisomerase I poisons, and (iii) inhibit formation of poly(ADP-ribose) polymer (pADPr) in intact cells were compared. RESULTS Consistent with earlier reports, olaparib and veliparib selectively induced apoptosis and inhibited colony formation in cells lacking BRCA2 or ATM. Moreover, like earlier generation PARP inhibitors, olaparib and veliparib sensitized cells to the topoisomerase I poisons camptothecin and topotecan. Finally, olaparib and veliparib inhibited formation of pADPr in intact cells. In contrast, iniparib exhibited little or no ability to selectively kill HR-deficient cells, sensitize cells to topoisomerase I poisons, or inhibit pADPr formation in situ. In further experiments, iniparib also failed to sensitize cells to cisplatin, gemcitabine, or paclitaxel. CONCLUSIONS While iniparib kills normal and neoplastic cells at high (>40 μmol/L) concentrations, its effects are unlikely to reflect PARP inhibition and should not be used to guide decisions about other PARP inhibitors.
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Affiliation(s)
- Anand G Patel
- Department of Molecular Pharmacology, Mayo Clinic, Rochester, MN, USA
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Patel AG, Flatten KS, Schneider PA, Dai NT, McDonald JS, Poirier GG, Kaufmann SH. Enhanced killing of cancer cells by poly(ADP-ribose) polymerase inhibitors and topoisomerase I inhibitors reflects poisoning of both enzymes. J Biol Chem 2011; 287:4198-210. [PMID: 22158865 DOI: 10.1074/jbc.m111.296475] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Poly(ADP-ribose) polymerase-1 (PARP1) plays critical roles in the regulation of DNA repair. Accordingly, small molecule inhibitors of PARP are being developed as agents that could modulate the activity of genotoxic chemotherapy, such as topoisomerase I poisons. In this study we evaluated the ability of the PARP inhibitor veliparib to enhance the cytotoxicity of the topoisomerase I poisons topotecan and camptothecin (CPT). Veliparib increased the cell cycle and cytotoxic effects of topotecan in multiple cell line models. Importantly, this sensitization occurred at veliparib concentrations far below those required to substantially inhibit poly(ADP-ribose) polymer synthesis and at least an order of magnitude lower than those involved in selective killing of homologous recombination-deficient cells. Further studies demonstrated that veliparib enhanced the effects of CPT in wild-type mouse embryonic fibroblasts (MEFs) but not Parp1(-/-) MEFs, confirming that PARP1 is the critical target for this sensitization. Importantly, parental and Parp1(-/-) MEFs had indistinguishable CPT sensitivities, ruling out models in which PARP1 catalytic activity plays a role in protecting cells from topoisomerase I poisons. To the contrary, cells were sensitized to CPT in a veliparib-independent manner upon transfection with PARP1 E988K, which lacks catalytic activity, or the isolated PARP1 DNA binding domain. These results are consistent with a model in which small molecule inhibitors convert PARP1 into a protein that potentiates the effects of topoisomerase I poisons by binding to damaged DNA and preventing its normal repair.
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Affiliation(s)
- Anand G Patel
- Division of Oncology Research, Mayo Clinic, Rochester, Minnesota 55905, USA
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Kaufmann SH, Karp JE, Litzow MR, Mesa RA, Hogan W, Steensma DP, Flatten KS, Loegering DA, Schneider PA, Peterson KL, Maurer MJ, Smith BD, Greer J, Chen Y, Reid JM, Ivy SP, Ames MM, Adjei AA, Erlichman C, Karnitz LM. Phase I and pharmacological study of cytarabine and tanespimycin in relapsed and refractory acute leukemia. Haematologica 2011; 96:1619-26. [PMID: 21791475 DOI: 10.3324/haematol.2011.049551] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND In preclinical studies the heat shock protein 90 (Hsp90) inhibitor tanespimycin induced down-regulation of checkpoint kinase 1 (Chk1) and other client proteins as well as increased sensitivity of acute leukemia cells to cytarabine. We report here the results of a phase I and pharmacological study of the cytarabine + tanespimycin combination in adults with recurrent or refractory acute leukemia. DESIGN AND METHODS Patients received cytarabine 400 mg/m(2)/day continuously for 5 days and tanespimycin infusions at escalating doses on days 3 and 6. Marrow mononuclear cells harvested before therapy, immediately prior to tanespimycin, and 24 hours later were examined by immunoblotting for Hsp70 and multiple Hsp90 clients. RESULTS Twenty-six patients were treated at five dose levels. The maximum tolerated dose was cytarabine 400 mg/m(2)/day for 5 days along with tanespimycin 300 mg/m(2) on days 3 and 6. Treatment-related adverse events included disseminated intravascular coagulation (grades 3 and 5), acute respiratory distress syndrome (grade 4), and myocardial infarction associated with prolonged exposure to tanespimycin and its active metabolite 17-aminogeldanamycin. Among 21 evaluable patients, there were two complete and four partial remissions. Elevations of Hsp70, a marker used to assess Hsp90 inhibition in other studies, were observed in more than 80% of samples harvested 24 hours after tanespimycin, but down-regulation of Chk1 and other Hsp90 client proteins was modest. CONCLUSIONS Because exposure to potentially effective concentrations occurs only for a brief time in vivo, at clinically tolerable doses tanespimycin has little effect on resistance-mediating client proteins in relapsed leukemia and exhibits limited activity in combination with cytarabine. (Clinicaltrials.gov identifier: NCT00098423).
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Affiliation(s)
- Scott H Kaufmann
- Division of Hematology, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
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Huntoon CJ, Nye MD, Geng L, Peterson KL, Flatten KS, Haluska P, Kaufmann SH, Karnitz LM. Heat shock protein 90 inhibition depletes LATS1 and LATS2, two regulators of the mammalian hippo tumor suppressor pathway. Cancer Res 2010; 70:8642-50. [PMID: 20841485 DOI: 10.1158/0008-5472.can-10-1345] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Heat shock protein 90 (HSP90), which regulates the functions of multiple oncogenic signaling pathways, has emerged as a novel anticancer therapeutic target, and multiple small-molecule HSP90 inhibitors are now in clinical trials. Although the effects of HSP90 inhibitors on oncogenic signaling pathways have been extensively studied, the effects of these agents on tumor suppressor signaling pathways are currently unknown. Here, we have examined how HSP90 inhibitors affect LATS1 and the related protein LATS2, two kinases that relay antiproliferative signals in the Hippo tumor suppressor pathway. Both LATS1 and LATS2 were depleted from cells treated with the HSP90 inhibitors 17-allylamino-17-demethoxygeldanamycin (17-AAG), radicicol, and PU-H71. Moreover, these kinases interacted with HSP90, and LATS1 isolated from 17-AAG-treated cells had reduced catalytic activity, thus showing that the kinase is a bona fide HSP90 client. Importantly, LATS1 signaling was disrupted by 17-AAG in tumor cell lines in vitro and clinical ovarian cancers in vivo as shown by reduced levels of LATS1 and decreased phosphorylation of the LATS substrate YAP, an oncoprotein transcriptional coactivator that regulates genes involved in cell and tissue growth, including the CTGF gene. Consistent with the reduced YAP phosphorylation, there were increased levels of CTGF, a secreted protein that is implicated in tumor proliferation, metastasis, and angiogenesis. Taken together, these results identify LATS1 and LATS2 as novel HSP90 clients and show that HSP90 inhibitors can disrupt the LATS tumor suppressor pathway in human cancer cells.
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Affiliation(s)
- Catherine J Huntoon
- Division of Oncology Research, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA
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32
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Meng XW, Heldebrant MP, Flatten KS, Loegering DA, Dai H, Schneider PA, Gomez TS, Peterson KL, Trushin SA, Hess AD, Smith BD, Karp JE, Billadeau DD, Kaufmann SH. Protein kinase Cbeta modulates ligand-induced cell surface death receptor accumulation: a mechanistic basis for enzastaurin-death ligand synergy. J Biol Chem 2009; 285:888-902. [PMID: 19887445 DOI: 10.1074/jbc.m109.057638] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [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
Although treatment with the protein kinase C (PKC) activator phorbol 12-myristate 13-acetate (PMA) is known to protect a subset of cells from induction of apoptosis by death ligands such as Fas ligand and tumor necrosis factor-alpha-related apoptosis-inducing ligand, the mechanism of this protection is unknown. This study demonstrated that protection in short term apoptosis assays and long term proliferation assays was maximal when Jurkat or HL-60 human leukemia cells were treated with 2-5 nm PMA. Immunoblotting demonstrated that multiple PKC isoforms, including PKCalpha, PKCbeta, PKCepsilon, and PKC, translocated from the cytosol to a membrane-bound fraction at these PMA concentrations. When the ability of short hairpin RNA (shRNA) constructs that specifically down-regulated each of these isoforms was examined, PKCbeta shRNA uniquely reversed PMA-induced protection against cell death. The PKCbeta-selective small molecule inhibitor enzastaurin had a similar effect. Although mass spectrometry suggested that Fas is phosphorylated on a number of serines and threonines, mutation of these sites individually or collectively had no effect on Fas-mediated death signaling or PMA protection. Further experiments demonstrated that PMA diminished ligand-induced cell surface accumulation of Fas and DR5, and PKCbeta shRNA or enzastaurin reversed this effect. Moreover, enzastaurin sensitized a variety of human tumor cell lines and clinical acute myelogenous leukemia isolates, which express abundant PKCbeta, to tumor necrosis factor-alpha related apoptosis-inducing ligand-induced death in the absence of PMA. Collectively, these results identify a specific PKC isoform that modulates death receptor-mediated cytotoxicity as well as a small molecule inhibitor that mitigates the inhibitory effects of PKC activation on ligand-induced death receptor trafficking and cell death.
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Affiliation(s)
- Xue Wei Meng
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA
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Molina JR, Kaufmann SH, Reid JM, Rubin SD, Gálvez-Peralta M, Friedman R, Flatten KS, Koch KM, Gilmer TM, Mullin RJ, Jewell RC, Felten SJ, Mandrekar S, Adjei AA, Erlichman C. Evaluation of lapatinib and topotecan combination therapy: tissue culture, murine xenograft, and phase I clinical trial data. Clin Cancer Res 2009; 14:7900-8. [PMID: 19047120 DOI: 10.1158/1078-0432.ccr-08-0415] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [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
PURPOSE Topotecan resistance can result from drug efflux by P-glycoprotein (Pgp) and breast cancer resistance protein (BCRP) as well as survival signals initiated by epidermal growth factor receptor family members. The present studies were done to determine the effect of combining topotecan and the dual epidermal growth factor receptor/HER2 inhibitor lapatinib in tissue culture, a murine xenograft model, and a phase I clinical trial. EXPERIMENTAL DESIGN The effects of lapatinib on topotecan accumulation and cytotoxicity in vitro were examined in paired cell lines lacking or expressing Pgp or BCRP. Antiproliferative effects of the combination were assessed in mice bearing HER2+ BT474 breast cancer xenografts. Based on tolerability in this preclinical model, 37 patients with advanced-stage cancers received escalating doses of lapatinib and topotecan in a phase I trial. RESULTS Lapatinib increased topotecan accumulation in BCRP- or Pgp-expressing cells in vitro, and the combination showed enhanced efficacy in HER2+ BT474 xenografts. In the phase I study, nausea, vomiting, diarrhea, and fatigue were dose limiting. The maximum tolerated doses were 1,250 mg/d lapatinib by mouth for 21 or 28 days with 3.2 mg/m2 topotecan i.v. on days 1, 8, and 15 of 28-day cycles. Pharmacokinetic analyses showed that combined drug administration resulted in decreased topotecan clearance consistent with transporter-mediated interactions. Seventeen (46%) patients had disease stabilization. CONCLUSIONS The lapatinib/topotecan combination is well tolerated and warrants further study.
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Affiliation(s)
- Julian R Molina
- Department of Oncology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.
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Gálvez-Peralta M, Dai NT, Loegering DA, Flatten KS, Safgren SL, Wagner JM, Ames MM, Karnitz LM, Kaufmann SH. Overcoming S-phase checkpoint-mediated resistance: sequence-dependent synergy of gemcitabine and 7-ethyl-10-hydroxycamptothecin (SN-38) in human carcinoma cell lines. Mol Pharmacol 2008; 74:724-35. [PMID: 18509065 DOI: 10.1124/mol.108.047787] [Citation(s) in RCA: 7] [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] [Indexed: 01/09/2023] Open
Abstract
Although agents that inhibit DNA synthesis are widely used in the treatment of cancer, the optimal method for combining such agents and the mechanism of their synergy is poorly understood. The present study examined the effects of combining gemcitabine (2',2'-difluoro 2'-deoxycytidine) and 7-ethyl-10-hydroxycamptothecin (SN-38; the active metabolite of irinotecan), two S-phaseselective agents that individually have broad antitumor activity, in human cancer cells in vitro. Colony-forming assays revealed that simultaneous treatment of Ovcar-5 ovarian cancer cells or BxPC-3 pancreatic cancer cells with gemcitabine and SN-38 resulted in antagonistic effects. In contrast, sequential treatment with these two agents in either order resulted in synergistic anti-proliferative effects, although the mechanism of synergy varied with the sequence. In particular, SN-38 arrested cells in S phase, enhanced the accumulation of gemcitabine metabolites, and diminished checkpoint kinase 1, thereby sensitizing cells in the SN-38 --> gemcitabine sequence. Gemcitabine treatment followed by removal allowed prolonged progression through S phase, contributing to synergy of the gemcitabine --> SN-38 sequence. These results collectively suggest that S-phase-selective agents might exhibit more cytotoxicity when administered sequentially rather than simultaneously.
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Affiliation(s)
- Marina Gálvez-Peralta
- Division of Oncology Research and Department of Molecular Pharmacology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA
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Jespersen DJ, Flatten KS, Jones MF, Smith TF. Prospective comparison of cell cultures and nucleic acid amplification tests for laboratory diagnosis of Chlamydia trachomatis Infections. J Clin Microbiol 2005; 43:5324-6. [PMID: 16208009 PMCID: PMC1248517 DOI: 10.1128/jcm.43.10.5324-5326.2005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [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: 11/20/2022] Open
Abstract
Specimens submitted in M5 medium for cell culture detection of Chlamydia trachomatis were tested by nucleic acid amplification testing (NAAT) and in cell cultures. Of 35 (genital) and 26 (nongenital) specimens positive for C. trachomatis, 21 and 14 specimens, respectively, were detected exclusively by NAAT. NAAT is significantly (P<0.0001) more sensitive than cell culture and should be considered the new "gold standard" for the laboratory diagnosis of C. trachomatis infections.
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Affiliation(s)
- Deborah J Jespersen
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA
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Karnitz LM, Flatten KS, Wagner JM, Loegering D, Hackbarth JS, Arlander SJH, Vroman BT, Thomas MB, Baek YU, Hopkins KM, Lieberman HB, Chen J, Cliby WA, Kaufmann SH. Gemcitabine-induced activation of checkpoint signaling pathways that affect tumor cell survival. Mol Pharmacol 2005; 68:1636-44. [PMID: 16126823 DOI: 10.1124/mol.105.012716] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [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: 12/18/2022] Open
Abstract
Two signaling pathways are activated by antineoplastic therapies that damage DNA and stall replication. In one pathway, double-strand breaks activate ataxia-telangiectasia mutated kinase (ATM) and checkpoint kinase 2 (Chk2), two protein kinases that regulate apoptosis, cell-cycle arrest, and DNA repair. In the second pathway, other types of DNA lesions and replication stress activate the Rad9-Hus1-Rad1 complex and the protein kinases ataxia-telangiectasia mutated and Rad3-related kinase (ATR) and checkpoint kinase 1 (Chk1), leading to changes that block cell-cycle progression, stabilize stalled replication forks, and influence DNA repair. Gemcitabine and cytarabine are two highly active chemotherapeutic agents that disrupt DNA replication. Here, we examine the roles these pathways play in tumor cell survival after treatment with these agents. Cells lacking Rad9, Chk1, or ATR were more sensitive to gemcitabine and cytarabine, consistent with the fact that these agents stall replication forks, and this sensitization was independent of p53 status. Interestingly, ATM depletion sensitized cells to gemcitabine and ionizing radiation but not cytarabine. Together, these results demonstrate that 1) gemcitabine triggers both checkpoint signaling pathways, 2) both pathways contribute to cell survival after gemcitabine-induced replication stress, and 3) although gemcitabine and cytarabine both stall replication forks, ATM plays differential roles in cell survival after treatment with these agents.
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Affiliation(s)
- Larry M Karnitz
- Division of Oncology Research, Guggenheim 13, Mayo Clinic College of Medicine, 200 First Street, S.W., Rochester, Minnesota 55905, USA.
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Farmer LJ, Zhi L, Jeong S, Lamph WW, Osburn DL, Croston G, Flatten KS, Heyman RA, Nadzan AM. Retinoic acid receptor ligands based on the 6-cyclopropyl-2,4-hexadienoic acid. Bioorg Med Chem Lett 2003; 13:261-4. [PMID: 12482435 DOI: 10.1016/s0960-894x(02)00924-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 10/27/2022]
Abstract
A series of novel cyclopropanyl methyl hexadienoic acid retinoids was designed and prepared. These compounds exhibited either selective activity as RXR agonists or pan-agonists on one or more of each of the RAR and RXR isoforms. The most potent pan-agonist 5a (RAR's EC(50)=17-59 nM; RXR's EC(50)=6-14 nM) showed good antiproliferative properties in the in vitro cancer cell lines, ME 180 and RPMI 8226.
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Affiliation(s)
- Luc J Farmer
- Discovery Research, Ligand Pharmaceuticals, Inc., 10275 Science Center Drive, San Diego, CA 92121, USA.
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Farmer LJ, Lin Zhi, Susan Jeong, Adam Kallel E, Croston G, Flatten KS, Heyman RA, Nadzan AM. Synthesis and structure-activity relationships of potent conformationally restricted retinoid X receptor ligands. Bioorg Med Chem Lett 1997. [DOI: 10.1016/s0960-894x(97)10079-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Farmer LJ, Jeong S, Kallel E, Canan Koch SS, Croston GE, Flatten KS, Heyman RA, Nadzan AM. Synthesis and structure-activity relationships of potent retinoid X receptor ligands. Bioorg Med Chem Lett 1997. [DOI: 10.1016/s0960-894x(97)00437-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Canan Koch SS, Dardashti LJ, Hebert JJ, White SK, Croston GE, Flatten KS, Heyman RA, Nadzan AM. Identification of the first retinoid X, receptor homodimer antagonist. J Med Chem 1996; 39:3229-34. [PMID: 8765503 DOI: 10.1021/jm960311d] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- S S Canan Koch
- Department of Retinoid Chemistry Research, Ligand Pharmaceuticals, Inc., San Diego, California 92121, USA
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