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de Keijzer MJ, de Klerk DJ, de Haan LR, van Kooten RT, Franchi LP, Dias LM, Kleijn TG, van Doorn DJ, Heger M. Inhibition of the HIF-1 Survival Pathway as a Strategy to Augment Photodynamic Therapy Efficacy. Methods Mol Biol 2022; 2451:285-403. [PMID: 35505024 DOI: 10.1007/978-1-0716-2099-1_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Photodynamic therapy (PDT) is a non-to-minimally invasive treatment modality that utilizes photoactivatable drugs called photosensitizers to disrupt tumors with locally photoproduced reactive oxygen species (ROS). Photosensitizer activation by light results in hyperoxidative stress and subsequent tumor cell death, vascular shutdown and hypoxia, and an antitumor immune response. However, sublethally afflicted tumor cells initiate several survival mechanisms that account for decreased PDT efficacy. The hypoxia inducible factor 1 (HIF-1) pathway is one of the most effective cell survival pathways that contributes to cell recovery from PDT-induced damage. Several hundred target genes of the HIF-1 heterodimeric complex collectively mediate processes that are involved in tumor cell survival directly and indirectly (e.g., vascularization, glucose metabolism, proliferation, and metastasis). The broad spectrum of biological ramifications culminating from the activation of HIF-1 target genes reflects the importance of HIF-1 in the context of therapeutic recalcitrance. This chapter elaborates on the involvement of HIF-1 in cancer biology, the hypoxic response mechanisms, and the role of HIF-1 in PDT. An overview of inhibitors that either directly or indirectly impede HIF-1-mediated survival signaling is provided. The inhibitors may be used as pharmacological adjuvants in combination with PDT to augment therapeutic efficacy.
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Affiliation(s)
- Mark J de Keijzer
- Jiaxing Key Laboratory for Photonanomedicine and Experimental Therapeutics, Department of Pharmaceutics, College of Medicine, Jiaxing University, Jiaxing, Zhejiang, People's Republic of China
- Department of Pharmaceutics, Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
| | - Daniel J de Klerk
- Jiaxing Key Laboratory for Photonanomedicine and Experimental Therapeutics, Department of Pharmaceutics, College of Medicine, Jiaxing University, Jiaxing, Zhejiang, People's Republic of China
- Laboratory of Experimental Oncology, Department of Pathology, Erasmus MC, Rotterdam, The Netherlands
| | - Lianne R de Haan
- Laboratory of Experimental Oncology, Department of Pathology, Erasmus MC, Rotterdam, The Netherlands
| | - Robert T van Kooten
- Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
| | - Leonardo P Franchi
- Departamento de Bioquímica e Biologia Molecular, Instituto de Ciências Biológicas (ICB) 2, Universidade Federal de Goiás (UFG), Goiânia, GO, Brazil
- Faculty of Philosophy, Sciences, and Letters of Ribeirão Preto, epartment of Chemistry, Center of Nanotechnology and Tissue Engineering-Photobiology and Photomedicine Research Group,University of São Paulo, São Paulo, Brazil
| | - Lionel M Dias
- Jiaxing Key Laboratory for Photonanomedicine and Experimental Therapeutics, Department of Pharmaceutics, College of Medicine, Jiaxing University, Jiaxing, Zhejiang, People's Republic of China
- Laboratory of Experimental Oncology, Department of Pathology, Erasmus MC, Rotterdam, The Netherlands
| | - Tony G Kleijn
- Jiaxing Key Laboratory for Photonanomedicine and Experimental Therapeutics, Department of Pharmaceutics, College of Medicine, Jiaxing University, Jiaxing, Zhejiang, People's Republic of China
- Laboratory of Experimental Oncology, Department of Pathology, Erasmus MC, Rotterdam, The Netherlands
| | - Diederick J van Doorn
- Department of Gastroenterology and Hepatology, Amsterdam UMC, Location AMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Michal Heger
- Jiaxing Key Laboratory for Photonanomedicine and Experimental Therapeutics, Department of Pharmaceutics, College of Medicine, Jiaxing University, Jiaxing, Zhejiang, People's Republic of China.
- Department of Pharmaceutics, Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
- Laboratory of Experimental Oncology, Department of Pathology, Erasmus MC, Rotterdam, The Netherlands.
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Ahmadi Moughari F, Eslahchi C. A computational method for drug sensitivity prediction of cancer cell lines based on various molecular information. PLoS One 2021; 16:e0250620. [PMID: 33914775 PMCID: PMC8084246 DOI: 10.1371/journal.pone.0250620] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 04/09/2021] [Indexed: 12/29/2022] Open
Abstract
Determining sensitive drugs for a patient is one of the most critical problems in precision medicine. Using genomic profiles of the tumor and drug information can help in tailoring the most efficient treatment for a patient. In this paper, we proposed a classification machine learning approach that predicts the sensitive/resistant drugs for a cell line. It can be performed by using both drug and cell line similarities, one of the cell line or drug similarities, or even not using any similarity information. This paper investigates the influence of using previously defined as well as two newly introduced similarities on predicting anti-cancer drug sensitivity. The proposed method uses max concentration thresholds for assigning drug responses to class labels. Its performance was evaluated using stratified five-fold cross-validation on cell line-drug pairs in two datasets. Assessing the predictive powers of the proposed model and three sets of methods, including state-of-the-art classification methods, state-of-the-art regression methods, and off-the-shelf classification machine learning approaches shows that the proposed method outperforms other methods. Moreover, The efficiency of the model is evaluated in tissue-specific conditions. Besides, the novel sensitive associations predicted by this model were verified by several supportive evidence in the literature and reliable database. Therefore, the proposed model can efficiently be used in predicting anti-cancer drug sensitivity. Material and implementation are available at https://github.com/fahmadimoughari/CDSML.
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Affiliation(s)
- Fatemeh Ahmadi Moughari
- Department of Computer and Data Sciences, Faculty of Mathematical Sciences, Shahid Beheshti University, Tehran, Iran
| | - Changiz Eslahchi
- Department of Computer and Data Sciences, Faculty of Mathematical Sciences, Shahid Beheshti University, Tehran, Iran
- School of Biological Sciences, Institute for Research in Fundamental Sciences(IPM), Tehran, Iran
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Continuous low-dose infusion of patupilone increases the therapeutic index in mouse and rat tumour models. Anticancer Drugs 2018; 29:691-701. [PMID: 29734209 DOI: 10.1097/cad.0000000000000639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Patupilone is a microtubule-targeted cytotoxic agent with clinical efficacy, but causes diarrhoea in more than 80% of patients. The efficacy and tolerability of patupilone delivered continuously by subcutaneous (s.c.) mini-pumps [(mini-pump dose (MPD)] or by intravenous bolus administration [intravenous bolus dose (IVBD)] were compared preclinically to determine whether the therapeutic index could be improved. The antiproliferative potency in vitro of patupilone was determined by measuring total cell protein. Tumours were grown s.c. in rats (A15) or nude mice (KB31, KB8511) or intracranially in nude mice (NCI-H460-Luc). Efficacy was monitored by measuring tumour volumes, bioluminescence or survival. Toxicity was monitored by body weight and/or diarrhoea. Total drug levels in blood, plasma, tissues or dialysates were quantified ex-vivo by liquid chromatography-mass spectroscopy/mass spectroscopy. Patupilone was potent in vitro with GI50s of 0.24-0.28 nmol/l and GI90s of 0.46-1.64 nmol/l. In rats, a single IVBD of patupilone dose dependently inhibited the growth of A15 tumours, but also caused dose-dependent body weight loss and diarrhoea, whereas MPD achieved similar efficacy, but no toxicity. In mice, MPD showed efficacy similar to that of IVBD against KB31 and KB8511 tumours, but with reduced toxicity. In a mouse intracranial tumour model, IVBD was more efficacious than MPD, consistent with patupilone concentrations in the brain. MPD provided constant plasma levels, whereas IVBD had very high C0/Cmin ratios of 70-280 (rat) or 8000 (mouse) over the dosing cycle. Overall, the correlation of plasma and tumour levels with response indicated that a Cave of at least GI90 led to tumour stasis. Continuous low concentrations of patupilone by MPD increased the therapeutic index in s.c. rodent tumour models compared with IVBD by maintaining efficacy, but reducing toxicity.
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Abstract
Mutations in cancer cells frequently result in cell cycle alterations that lead to unrestricted growth compared to normal cells. Considering this phenomenon, many drugs have been developed to inhibit different cell-cycle phases. Mitotic phase targeting disturbs mitosis in tumor cells, triggers the spindle assembly checkpoint and frequently results in cell death. The first anti-mitotics to enter clinical trials aimed to target tubulin. Although these drugs improved the treatment of certain cancers, and many anti-microtubule compounds are already approved for clinical use, severe adverse events such as neuropathies were observed. Since then, efforts have been focused on the development of drugs that also target kinases, motor proteins and multi-protein complexes involved in mitosis. In this review, we summarize the major proteins involved in the mitotic phase that can also be targeted for cancer treatment. Finally, we address the activity of anti-mitotic drugs tested in clinical trials in recent years.
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Yan J, Zhang D, Yu H, Ma L, Deng M, Tang Z, Zhang X. Patupilone-loaded poly(L-glutamic acid)-graft-methoxy-poly(ethylene glycol) micelle for oncotherapy. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2017; 28:394-414. [DOI: 10.1080/09205063.2016.1277827] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jing Yan
- Department of Chemistry, Xiangtan University, Xiangtan, PR China
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
| | - Dawei Zhang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
| | - Haiyang Yu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
| | - Lili Ma
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
| | - Mingxiao Deng
- College of Chemistry, Northeast Normal University, Changchun, PR China
| | - Zhaohui Tang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, PR China
| | - Xuefei Zhang
- Department of Chemistry, Xiangtan University, Xiangtan, PR China
- Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Key Laboratory of Polymeric Materials and Application Technology of Hunan Province, Xiangtan University, Xiangtan, PR China
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Nayak L, DeAngelis LM, Robins HI, Govindan R, Gadgeel S, Kelly K, Rigas JR, Peereboom DM, Rosenfeld SS, Muzikansky A, Zheng M, Urban P, Abrey LE, Omuro A, Wen PY. Multicenter phase 2 study of patupilone for recurrent or progressive brain metastases from non-small cell lung cancer. Cancer 2015; 121:4165-72. [PMID: 26308485 DOI: 10.1002/cncr.29636] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 07/09/2015] [Accepted: 07/13/2015] [Indexed: 01/07/2023]
Abstract
BACKGROUND Treatment options for patients with non-small cell lung cancer (NSCLC) with brain metastases are limited. Patupilone (EPO906), a blood-brain barrier-penetrating, microtubule-targeting, cytotoxic agent, has shown clinical activity in phase 1/2 studies in patients with NSCLC. This study evaluates the efficacy, pharmacokinetics, and safety of patupilone in NSCLC brain metastases. METHODS Adult patients with NSCLC and confirmed progressive brain metastases received patupilone intravenously at 10 mg/m(2) every 3 weeks. The primary endpoint of this multinomial 2-stage study combined early progression (EP; death or progression within 3 weeks) and progression-free survival at 9 weeks (PFS9w) to determine drug activity. RESULTS Fifty patients with a median age of 60 years (range, 33-74 years) were enrolled; the majority were men (58%), and most had received prior therapy for brain metastases (98%). The PFS9w rate was 36%, and the EP rate was 26%. Patupilone blood pharmacokinetic analyses showed mean areas under the concentration-time curve from time zero to 504 hours for cycles 1 and 3 of 1544 and 1978 ng h/mL, respectively, and a mean steady state distribution volume of 755 L/m(2) . Grade 3/4 adverse events (AEs), regardless of their relation with the study drug, included diarrhea (24%), pulmonary embolisms (8%), convulsions (4%), and peripheral neuropathy (4%). All patients discontinued the study drug: 31 (62%) for disease progression and 13 (26%) for AEs. Twenty-five of 32 deaths were due to brain metastases. The median time to progression and the overall survival were 3.2 and 8.8 months, respectively. CONCLUSIONS This is the first prospective study of chemotherapy for recurrent brain metastases from NSCLC. In this population, patupilone demonstrated activity in heavily treated patients.
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Affiliation(s)
- Lakshmi Nayak
- Center For Neuro-Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Lisa M DeAngelis
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - H Ian Robins
- Department of Human Oncology, University of Wisconsin Hospital and Clinics, Madison, Wisconsin
| | - Ramaswamy Govindan
- Division of Oncology, Washington University School of Medicine in St. Louis, St. Louis, Missouri
| | - Shirish Gadgeel
- Karmanos Cancer Institute/Wayne State University, Detroit, Michigan
| | - Karen Kelly
- Division of Hematology and Oncology, Davis Comprehensive Cancer Center, University of California, Sacramento, California
| | - James R Rigas
- Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - David M Peereboom
- Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, Ohio
| | - Steven S Rosenfeld
- Department of Neurology, Columbia University Medical Center/New York Presbyterian, New York, New York
| | - Alona Muzikansky
- Biostatistics Center, Massachusetts General Hospital, Boston, Massachusetts
| | - Ming Zheng
- Novartis Pharmaceuticals Corporation, East Hanover, New Jersey
| | - Patrick Urban
- Novartis Pharmaceuticals Corporation, East Hanover, New Jersey
| | - Lauren E Abrey
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Antonio Omuro
- Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Patrick Y Wen
- Center For Neuro-Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts
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Loong HH, Yeo W. Microtubule-targeting agents in oncology and therapeutic potential in hepatocellular carcinoma. Onco Targets Ther 2014; 7:575-85. [PMID: 24790457 PMCID: PMC3999274 DOI: 10.2147/ott.s46019] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In mammalian cells, microtubules are present both in interphase and dividing cells. In the latter, microtubules forming the mitotic spindle are highly dynamic and exquisitely sensitive to therapeutic inhibitors. Developed to alter microtubule function, microtubule-binding agents have been proven to be highly active as an anticancer treatment. Significant development of microtubule-binding agents has taken place in recent years, with newer anti-tubulin agents now showing novel properties of enhanced tumor specificity, reduced neurotoxicity, and insensitivity to chemoresistance mechanisms. Hepatocellular carcinoma remains one of the most difficult cancers to treat, with chemotherapies being relatively ineffective. There is now evidence to suggest that microtubule-binding agents may be effective in the treatment of hepatocellular carcinoma, especially when used in combination with mammalian target of rapamycin inhibitors. Preclinical models have suggested that the latter may be able to overcome resistance to microtubule binding agents. In this review article, recent developments of novel microtubule binding agents and their relevance to the treatment of hepatocellular carcinoma will be discussed.
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Affiliation(s)
- Herbert H Loong
- Department of Clinical Oncology, Sir YK Pao Centre for Cancer, Hong Kong Cancer Institute, State Key Laboratory in Oncology in South China, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
| | - Winnie Yeo
- Department of Clinical Oncology, Sir YK Pao Centre for Cancer, Hong Kong Cancer Institute, State Key Laboratory in Oncology in South China, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Melichar B. Laboratory medicine and medical oncology: the tale of two Cinderellas. Clin Chem Lab Med 2014; 51:99-112. [PMID: 22987835 DOI: 10.1515/cclm-2012-0496] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 08/01/2012] [Indexed: 11/15/2022]
Abstract
Cancer represents a leading cause of death in the developed countries. The past 50 years have witnessed major progress in both laboratory medicine and clinical oncology that has translated into improved prognosis of cancer patients. From the humble beginnings as unrelated specialties, major advances in the understanding of molecular bases of cancer progression led to increased interactions between laboratory medicine and clinical (mostly medical) oncology. Laboratory medicine is now an integral part of the management of cancer patients. The many aspects of the role of laboratory medicine in clinical oncology include the determination of biomarkers that are used in establishing the diagnosis, predicting response to therapy or prognosis, study of the host response to tumor growth, detection of treatment toxicity and determining the concentrations of anticancer drugs.
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Affiliation(s)
- Bohuslav Melichar
- Department of Oncology, Palacký University Medical School and Teaching Hospital, Fakultní nemocnice, Olomouc, Czech Republic.
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Moorcraft SY, Chau I, Peckitt C, Cunningham D, Rao S, Yim KL, Walther A, Jackson CGCA, Stamp G, Webb J, Smith G, Gillbanks A, Swanton C. Patupilone in patients with pretreated metastatic/locally recurrent colorectal cancer: results of the Phase II CINATRA trial. Invest New Drugs 2013; 31:1339-44. [DOI: 10.1007/s10637-013-9990-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 06/12/2013] [Indexed: 01/09/2023]
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Hirsch BR, Reed SD, Lyman GH. Update on the Role of Epothilones in Metastatic Breast Cancer. CURRENT BREAST CANCER REPORTS 2012. [DOI: 10.1007/s12609-012-0095-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Orlowski K, Rohrer Bley C, Zimmermann M, Vuong V, Hug D, Soltermann A, Broggini-Tenzer A, Pruschy M. Dynamics of tumor hypoxia in response to patupilone and ionizing radiation. PLoS One 2012; 7:e51476. [PMID: 23251549 PMCID: PMC3519688 DOI: 10.1371/journal.pone.0051476] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Accepted: 11/07/2012] [Indexed: 12/29/2022] Open
Abstract
Tumor hypoxia is one of the most important parameters that determines treatment sensitivity and is mainly due to insufficient tumor angiogenesis. However, the local oxygen concentration in a tumor can also be shifted in response to different treatment modalities such as cytotoxic agents or ionizing radiation. Thus, combined treatment modalities including microtubule stabilizing agents could create an additional challenge for an effective treatment response due to treatment-induced shifts in tumor oxygenation. Tumor hypoxia was probed over a prolonged observation period in response to treatment with different cytotoxic agents, using a non-invasive bioluminescent ODD-Luc reporter system, in which part of the oxygen-dependent degradation (ODD) domain of HIF-1α is fused to luciferase. As demonstrated in vitro, this system not only detects hypoxia at an ambient oxygen concentration of 1% O2, but also discriminates low oxygen concentrations in the range from 0.2 to 1% O2. Treatment of A549 lung adenocarcinoma-derived tumor xenografts with the microtubule stabilizing agent patupilone resulted in a prolonged increase in tumor hypoxia, which could be used as marker for its antitumoral treatment response, while irradiation did not induce detectable changes in tumor hypoxia. Furthermore, despite patupilone-induced hypoxia, the potency of ionizing radiation (IR) was not reduced as part of a concomitant or adjuvant combined treatment modality.
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Affiliation(s)
- Katrin Orlowski
- Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland
- KFSP Tumor Oxygenation, University of Zurich, Switzerland
| | - Carla Rohrer Bley
- Division of Radiation Oncology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
| | - Martina Zimmermann
- Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland
| | - Van Vuong
- Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland
| | - Daniel Hug
- Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland
| | - Alex Soltermann
- Department of Pathology, University Hospital Zurich, Zurich, Switzerland
| | | | - Martin Pruschy
- Department of Radiation Oncology, University Hospital Zurich, Zurich, Switzerland
- KFSP Tumor Oxygenation, University of Zurich, Switzerland
- * E-mail:
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Kelly KR, Zollinger M, Lozac’h F, Tan E, Mita A, Waldmeier F, Urban P, Anand S, Wang Y, Swart P, Takimoto C, Mita M. Metabolism of patupilone in patients with advanced solid tumor malignancies. Invest New Drugs 2012; 31:605-15. [DOI: 10.1007/s10637-012-9838-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Accepted: 05/21/2012] [Indexed: 11/29/2022]
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Entwistle RA, Rizk RS, Cheng DM, Lushington GH, Himes RH, Gupta ML. Differentiating between models of epothilone binding to microtubules using tubulin mutagenesis, cytotoxicity, and molecular modeling. ChemMedChem 2012; 7:1580-6. [PMID: 22807375 DOI: 10.1002/cmdc.201200286] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Indexed: 11/08/2022]
Abstract
Microtubule stabilizers are powerful antimitotic compounds and represent a proven cancer treatment strategy. Several classes of compounds in clinical use or trials, such as the taxanes and epothilones, bind to the same region of β-tubulin. Determining how these molecules interact with tubulin and stabilize microtubules is important both for understanding the mechanism of action and enhancing chemotherapeutic potential, for example, minimizing side effects, increasing solubility, and overcoming resistance. Structural studies using non-polymerized tubulin or stabilized polymers have produced different models of epothilone binding. In this study we used directed mutagenesis of the binding site on Saccharomyces cerevisiae β-tubulin to analyze interactions between epothilone B and its biologically relevant substrate, dynamic microtubules. Five engineered amino acid changes contributed to a 125-fold increase in epothilone B cytotoxicity independent of inherent microtubule stability. The mutagenesis of endogenous β-tubulin was done in otherwise isogenic strains. This facilitated the correlation of amino acid substitutions with altered cytotoxicity using molecular mechanics simulations. The results, which are based on the interaction between epothilone B and dynamic microtubules, most strongly support the binding mode determined by NMR spectroscopy-based studies. This work establishes a system for discriminating between potential binding modes and among various compounds and/or analogues using a sensitive biological activity-based readout.
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Affiliation(s)
- Ruth A Entwistle
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045-7534, USA
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Buchler T, Pavlik T, Bortlicek Z, Poprach A, Vyzula R, Abrahamova J, Melichar B. Objective response and time to progression on sequential treatment with sunitinib and sorafenib in metastatic renal cell carcinoma. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2012; 156:81-92. [PMID: 22752573 DOI: 10.5507/bp.2012.047] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Patients with metastatic renal cell carcinoma (mRCC) are often treated sequentially with targeted agents, although the optimal strategy is not known. A retrospective, registry-based study has been carried out to assess correlation between clinical response and progression-free survival in patients with mRCC treated sequentially with tyrosine-kinase inhibitors (TKIs) sunitinib and sorafenib. Data on 218 mRCC patients treated with sunitinib and sorafenib who completed therapy with both TKIs were obtained from a database of mRCC patients. Standard nonparametric methods were used to assess correlation between response, PFS and length of treatment on the two agents. A strong correlation between responses to first- versus second TKI was observed (p < 0.001). No significant association was noted between the duration of therapy with the two TKIs (p = 0.056), although there was a weak statistically significant correlation between progression-free survival times in the subgroup patients who discontinued treatment because of disease progression. In conclusion, the duration of response on first TKI is of limited value in selecting mRCC patients for sequential TKI therapy. There is a strong correlation between the types of tumour response on the first- versus the second TKI.
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Affiliation(s)
- Tomas Buchler
- Department of Oncology, First Faculty of Medicine, Thomayer Hospital and Charles University, Videnska 800, 140 59, Prague, Czech Republic.
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Oehler C, Frei K, Rushing EJ, McSheehy PM, Weber D, Allegrini PR, Weniger D, Lütolf UM, Knuth A, Yonekawa Y, Barath K, Broggini-Tenzer A, Pruschy M, Hofer S. Patupilone (Epothilone B) for Recurrent Glioblastoma: Clinical Outcome and Translational Analysis of a Single-Institution Phase I/II Trial. Oncology 2012; 83:1-9. [DOI: 10.1159/000339152] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Accepted: 04/25/2012] [Indexed: 12/21/2022]
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