1
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Djerdjouri A, Abbad M, Boumrah Y, Malik S, Makhzoum A, Lakhdar K. Tapping the potential of Calotropis procera hairy roots for cardiac glycosides production and their identification using UHPLC/QTOF-MS. 3 Biotech 2024; 14:199. [PMID: 39144068 PMCID: PMC11319682 DOI: 10.1007/s13205-024-04035-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 07/14/2024] [Indexed: 08/16/2024] Open
Abstract
The present work deals with the establishment of hairy root cultures from different explants of C. procera using Agrobacterium rhizogenes strain A4. A high transformation frequency (95%) was obtained from leaves followed by cotyledons (81.6%) and hypocotyls (38.3%). Genetic transformation of hairy roots was confirmed through PCR by amplifying a 400 bp fragment of the rolB gene. Hairy roots were highly branched, possessed plagiotropic and rapid growth on hormone-free ½ B5 medium. Ten cardiac glycosides, including calotropagenin, calotoxin, frugoside, coroglaucigenin, calotropin, calactin, uzarigenin, asclepin, uscharidin, and uscharin, based on their specific masses and fragmentation properties were identified in ethanolic extracts of hairy roots by ultra-high-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry UHPLC/QTOF-MS. This protocol could be used as a powerful tool for large-scale in vitro production of highly valued cardiac glycosides and for further transcriptomics or metabolomics studies.
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Affiliation(s)
- Amina Djerdjouri
- École Nationale Supérieure Agronomique (ES1603), Laboratoire des Ressources Génétiques et Biotechnologie, 16200 Alger, Algérie
| | - Mohamed Abbad
- Université de Blida1, Faculté des Sciences de la Nature et de la Vie, Département des Biotechnologies, Laboratoire de biotechnologie des productions végétales, Blida, BP 270, Route de Soumaâ, 09000 Algérie
| | - Yacine Boumrah
- Institut National de Criminalistique et de Criminologie, (INCC/GN), Bouchaoui, Alger, Algérie
| | - Sonia Malik
- Department of Biotechnology, Baba Farid College, Bathinda, India
| | - Abdullah Makhzoum
- Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, Palapye, Botswana
| | - Khelifi Lakhdar
- École Nationale Supérieure Agronomique (ES1603), Laboratoire des Ressources Génétiques et Biotechnologie, 16200 Alger, Algérie
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2
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Joshi BC, Juyal V, Sah AN, Verma P, Mukhija M. Review On Documented Medicinal Plants Used For The Treatment Of Cancer. CURRENT TRADITIONAL MEDICINE 2021. [DOI: 10.2174/2215083807666211011125110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Background:
Cancer is a frightful disease and it is the second leading cause of death worldwide. Naturally derived compounds are gaining interest of research workers as they have less toxic side effects as compared to currently used treatments such as chemotherapy. Plants are the pool of chemical compounds which provides a promising future for research on cancer.
Objective:
This review paper provides updated information gathered on medicinal plants and isolated phytoconstituents used as anticancer agents and summarises the plant extracts and their isolated chemical constituents exhibiting anticancer potential on clinical trials.
Methods:
An extensive bibliographic investigation was carried out by analysing worldwide established scientific databases like SCOPUS, PUBMED, SCIELO, ScienceDirect, Springerlink, Web of Science, Wiley, SciFinder and Google Scholar etc. In next few decades, herbal medicine may become a new epoch of medical system.
Results:
Many researches are going on medicinal plants for the treatment of cancer but it is a time to increase further experimental studies on plant extracts and their chemical constituents to find out their mechanism of action at molecular level.
Conclusion:
The article may help many researchers to start off further experimentation that might lead to the drugs for the cancer treatment.
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Affiliation(s)
- Bhuwan Chandra Joshi
- Department of Pharmaceutical Sciences, Faculty of Technology, Kumaun University, Bhimtal Campus, Nainital-263136, India
| | - Vijay Juyal
- Department of Pharmaceutical Sciences, Faculty of Technology, Kumaun University, Bhimtal Campus, Nainital-263136, India
| | - Archana N. Sah
- Department of Pharmaceutical Sciences, Faculty of Technology, Kumaun University, Bhimtal Campus, Nainital-263136, India
| | - Piyush Verma
- Department of Pharmacology, School of Pharmaceutical science and Technology, Sardar Bhagwan Singh University, Dehradun-248001, India
| | - Minky Mukhija
- Department of Pharmaceutical Sciences, Ch. Devi Lal College of Pharmacy, Buria Road, Bhagwangarh, Jagadhri-135003, India
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3
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Ma Z, Wang LZ, Cheng JT, Lam WST, Ma X, Xiang X, Wong ALA, Goh BC, Gong Q, Sethi G, Wang L. Targeting Hypoxia-Inducible Factor-1-Mediated Metastasis for Cancer Therapy. Antioxid Redox Signal 2021; 34:1484-1497. [PMID: 33198508 DOI: 10.1089/ars.2019.7935] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Significance: Hypoxia is emerging as a crucial regulator of the tumor microenvironment; it governs the metastatic potential of multiple primary cancers. It is also potentially involved in the regulation of tumorigenesis, tumor metabolism, and proangiogenic activity. Recent Advances: A wealth of clinical data across a wide range of cancer types has revealed strong correlations between hypoxia or the overexpression of hypoxia-inducible transcription factors and the rates of distant metastases and poor prognoses. Hypoxia-inducible factor (HIF)-1α, one of the key regulatory molecules of the HIF-1 signaling pathways, is involved in multiple crucial steps in the metastatic cascade. Critical Issues: Here, we present recent findings on the roles of the HIF-1 complex in tumor metastasis and highlight the potential of HIF-1α as a target for abrogating tumor metastasis. Moreover, we systematically describe the regulatory role of HIF-1 at each step of the metastatic cascade. Finally, we present the most recent advances in potential pharmacological interventions and the development of specific HIF-1 inhibitors for blocking tumor metastasis. Future Directions: Well-designed clinical trials are urgently needed to validate the anti-metastatic activity of HIF-1 inhibitors discovered in preclinical models. Antioxid. Redox Signal. 34, 1484-1497.
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Affiliation(s)
- Zhaowu Ma
- Department of Immunology, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, China.,The First School of Clinical Medicine, Health Science Center, Yangtze University, Nanhuan Road, Jingzhou, China
| | - Louis Zizhao Wang
- SingHealth Internal Medicine Residency Programme, Singapore General Hospital, Singapore, Singapore
| | - Jun-Ting Cheng
- Department of Immunology, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, China.,The First School of Clinical Medicine, Health Science Center, Yangtze University, Nanhuan Road, Jingzhou, China
| | - Walter Sze Tung Lam
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Xiang Ma
- School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoqiang Xiang
- Department of Clinical Pharmacy, School of Pharmacy, Fudan University, Shanghai, P.R. China
| | - Andrea Li-Ann Wong
- Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore.,Department of Haematology-Oncology, National University Cancer Institute, Singapore, Singapore
| | - Boon Cher Goh
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore.,Department of Haematology-Oncology, National University Cancer Institute, Singapore, Singapore
| | - Quan Gong
- Department of Immunology, School of Basic Medicine, Health Science Center, Yangtze University, Jingzhou, China.,The First School of Clinical Medicine, Health Science Center, Yangtze University, Nanhuan Road, Jingzhou, China
| | - Gautam Sethi
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Lingzhi Wang
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
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4
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Liu SH, Yu J, Creeden JF, Sutton JM, Markowiak S, Sanchez R, Nemunaitis J, Kalinoski A, Zhang JT, Damoiseaux R, Erhardt P, Brunicardi FC. Repurposing metformin, simvastatin and digoxin as a combination for targeted therapy for pancreatic ductal adenocarcinoma. Cancer Lett 2020; 491:97-107. [PMID: 32829010 DOI: 10.1016/j.canlet.2020.08.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/23/2020] [Accepted: 08/01/2020] [Indexed: 12/12/2022]
Abstract
Patients with pancreatic adenocarcinoma (PDAC) have a 5-year survival rate of 8%, the lowest of any cancer in the United States. Traditional chemotherapeutic regimens, such as gemcitabine- and fluorouracil-based regimens, often only prolong survival by months. Effective precision targeted therapy is therefore urgently needed to substantially improve survival. In an effort to expedite approval and delivery of targeted therapy to patients, we utilized a platform to develop a novel combination of FDA approved drugs that would target pancreaticoduodenal homeobox1 (PDX1) and baculoviral inhibitor of apoptosis repeat-containing 5 (BIRC5) utilizing super-promoters of the target genes to interrogate an FDA approved drug library. We identified and selected metformin, simvastatin and digoxin (C3) as a novel combination of FDA approved drugs, which were shown to effectively target PDX1 and BIRC5 in human PDAC tumors in mice with no toxicity.
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Affiliation(s)
- Shi-He Liu
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA; Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA.
| | - Juehua Yu
- Department of Surgery, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - Justin F Creeden
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA; Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Jeffrey M Sutton
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Stephen Markowiak
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Robbi Sanchez
- Department of Surgery, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - John Nemunaitis
- Department of Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Andrea Kalinoski
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Jian-Ting Zhang
- Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
| | - Robert Damoiseaux
- Department of Molecular and Medical Pharmacology, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | - Paul Erhardt
- Department of Medicinal and Biological Chemistry, University of Toledo College of Pharmacy and Pharmaceutical Sciences, Toledo, OH, 43614, USA
| | - F Charles Brunicardi
- Department of Surgery, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA; Department of Cancer Biology, University of Toledo College of Medicine and Life Sciences, Toledo, OH, 43614, USA
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5
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Abstract
The Mycobacterium sp. BRS2A-AR2 is an endophyte of the mangrove plant Rhizophora racemosa G. Mey., which grows along the banks of the River Butre, in the Western Region of Ghana. Chemical profiling using 1H-NMR and HRESI-LC-MS of fermentation extracts produced by the strain led to the isolation of the new compound, α-d-Glucopyranosyl-(1→2)-[6-O-(l-tryptophanyl)-β-d–fructofuranoside] or simply tortomycoglycoside (1). Compound 1 is an aminoglycoside consisting of a tryptophan moiety esterified to a disaccharide made up of β-d-fructofuranose and α-d-glucopyranose sugars. The full structure of 1 was determined using UV, IR, 1D, 2D-NMR and HRESI-LC-MS data. When tested against Trypanosoma brucei subsp. brucei, the parasite responsible for Human African Trypanosomiasis in sub-Saharan Africa, 1 (IC50 11.25 µM) was just as effective as Coptis japonica (Thunb.) Makino. (IC50 8.20 µM). The extract of Coptis japonica (Thunb.) Makino. is routinely used as laboratory standard due to its powerful antitrypanosomal activity. It is possible that, compound 1 interferes with the normal uptake and metabolism of tryptophan in the T. brucei subsp. brucei parasite.
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6
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Turanli B, Grøtli M, Boren J, Nielsen J, Uhlen M, Arga KY, Mardinoglu A. Drug Repositioning for Effective Prostate Cancer Treatment. Front Physiol 2018; 9:500. [PMID: 29867548 PMCID: PMC5962745 DOI: 10.3389/fphys.2018.00500] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Accepted: 04/18/2018] [Indexed: 12/20/2022] Open
Abstract
Drug repositioning has gained attention from both academia and pharmaceutical companies as an auxiliary process to conventional drug discovery. Chemotherapeutic agents have notorious adverse effects that drastically reduce the life quality of cancer patients so drug repositioning is a promising strategy to identify non-cancer drugs which have anti-cancer activity as well as tolerable adverse effects for human health. There are various strategies for discovery and validation of repurposed drugs. In this review, 25 repurposed drug candidates are presented as result of different strategies, 15 of which are already under clinical investigation for treatment of prostate cancer (PCa). To date, zoledronic acid is the only repurposed, clinically used, and approved non-cancer drug for PCa. Anti-cancer activities of existing drugs presented in this review cover diverse and also known mechanisms such as inhibition of mTOR and VEGFR2 signaling, inhibition of PI3K/Akt signaling, COX and selective COX-2 inhibition, NF-κB inhibition, Wnt/β-Catenin pathway inhibition, DNMT1 inhibition, and GSK-3β inhibition. In addition to monotherapy option, combination therapy with current anti-cancer drugs may also increase drug efficacy and reduce adverse effects. Thus, drug repositioning may become a key approach for drug discovery in terms of time- and cost-efficiency comparing to conventional drug discovery and development process.
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Affiliation(s)
- Beste Turanli
- Science for Life Laboratory, KTH Royal Institute of Technology, Stockholm, Sweden
- Department of Bioengineering, Istanbul Medeniyet University, Istanbul, Turkey
- Department of Bioengineering, Marmara University, Istanbul, Turkey
| | - Morten Grøtli
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Jan Boren
- Department of Molecular and Clinical Medicine, Sahlgrenska University Hospital, University of Gothenburg, Gothenburg, Sweden
| | - Jens Nielsen
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Mathias Uhlen
- Science for Life Laboratory, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Kazim Y. Arga
- Department of Bioengineering, Marmara University, Istanbul, Turkey
| | - Adil Mardinoglu
- Science for Life Laboratory, KTH Royal Institute of Technology, Stockholm, Sweden
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
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7
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Jun JC, Rathore A, Younas H, Gilkes D, Polotsky VY. Hypoxia-Inducible Factors and Cancer. CURRENT SLEEP MEDICINE REPORTS 2017. [PMID: 28944164 DOI: 10.1007/s40675-017-0062-7.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
PURPOSE OF REVIEW Hypoxia inducible factors (HIFs) mediate the transcription of hundreds of genes that allow cells to adapt to hypoxic environments. In this review, we summarize the current state of knowledge about mechanisms of HIF activation in cancer, as well as downstream cancer-promoting consequences such as altered substrate metabolism, angiogenesis, and cell differentiation. In addition, we examine the proposed relationship between respiratory-related hypoxia, HIFs, and cancer. RECENT FINDINGS HIFs are increased in many forms of cancer, and portend a poor prognosis and response to therapy. CONCLUSION HIFs play a critical role in various stages of carcinogenesis. HIF and its transcription targets may be useful as biomarkers of disease and therapeutic targets for cancer.
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Affiliation(s)
- Jonathan C Jun
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Aman Rathore
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Haris Younas
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Daniele Gilkes
- Division of Breast Cancer, Department of Oncology, Johns Hopkins University, Baltimore, MD
| | - Vsevolod Y Polotsky
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
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8
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Harguindey S, Stanciu D, Devesa J, Alfarouk K, Cardone RA, Polo Orozco JD, Devesa P, Rauch C, Orive G, Anitua E, Roger S, Reshkin SJ. Cellular acidification as a new approach to cancer treatment and to the understanding and therapeutics of neurodegenerative diseases. Semin Cancer Biol 2017; 43:157-179. [PMID: 28193528 DOI: 10.1016/j.semcancer.2017.02.003] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 02/06/2017] [Indexed: 12/27/2022]
Abstract
During the last few years, the understanding of the dysregulated hydrogen ion dynamics and reversed proton gradient of cancer cells has resulted in a new and integral pH-centric paradigm in oncology, a translational model embracing from cancer etiopathogenesis to treatment. The abnormalities of intracellular alkalinization along with extracellular acidification of all types of solid tumors and leukemic cells have never been described in any other disease and now appear to be a specific hallmark of malignancy. As a consequence of this intracellular acid-base homeostatic failure, the attempt to induce cellular acidification using proton transport inhibitors and other intracellular acidifiers of different origins is becoming a new therapeutic concept and selective target of cancer treatment, both as a metabolic mediator of apoptosis and in the overcoming of multiple drug resistance (MDR). Importantly, there is increasing data showing that different ion channels contribute to mediate significant aspects of cancer pH regulation and etiopathogenesis. Finally, we discuss the extension of this new pH-centric oncological paradigm into the opposite metabolic and homeostatic acid-base situation found in human neurodegenerative diseases (HNDDs), which opens novel concepts in the prevention and treatment of HNDDs through the utilization of a cohort of neural and non-neural derived hormones and human growth factors.
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Affiliation(s)
- Salvador Harguindey
- Institute of Clinical Biology and Metabolism, c) Postas 13, 01004 Vitoria, Spain.
| | - Daniel Stanciu
- Institute of Clinical Biology and Metabolism, c) Postas 13, 01004 Vitoria, Spain
| | - Jesús Devesa
- Department of Physiology, School of Medicine, University of Santiago de Compostela, Spain and Scientific Director of Foltra Medical Centre, Teo, Spain
| | - Khalid Alfarouk
- Al-Ghad International Colleges for Applied Medical Sciences, Al-Madinah Al-Munawarah, Saudi Arabia
| | - Rosa Angela Cardone
- Department of Biosciences, Biotechnology and Biopharmaceutics, University of Bari, Via E. Orabona 4, 70125 Bari, Italy
| | | | - Pablo Devesa
- Research and Development, Medical Centre Foltra, Teo, Spain
| | - Cyril Rauch
- School of Veterinary Medicine and Science, University of Nottingham,College Road, Sutton Bonington, LE12 5RD, UK
| | - Gorka Orive
- Laboratory of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of the Basque Country, Networking Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, SLFPB-EHU, 01006 Vitoria, Spain
| | - Eduardo Anitua
- BTI Biotechnology Institute ImasD, S.L. C/Jacinto Quincoces, 39, 01007 Vitoria, Spain
| | - Sébastien Roger
- Inserm UMR1069, University François-Rabelais of Tours,10 Boulevard Tonnellé, 37032 Tours, France; Institut Universitaire de France, 1 Rue Descartes, Paris 75231, France
| | - Stephan J Reshkin
- Department of Biosciences, Biotechnology and Biopharmaceutics, University of Bari, Via E. Orabona 4, 70125 Bari, Italy
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9
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Jun JC, Rathore A, Younas H, Gilkes D, Polotsky VY. Hypoxia-Inducible Factors and Cancer. CURRENT SLEEP MEDICINE REPORTS 2017; 3:1-10. [PMID: 28944164 DOI: 10.1007/s40675-017-0062-7] [Citation(s) in RCA: 160] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE OF REVIEW Hypoxia inducible factors (HIFs) mediate the transcription of hundreds of genes that allow cells to adapt to hypoxic environments. In this review, we summarize the current state of knowledge about mechanisms of HIF activation in cancer, as well as downstream cancer-promoting consequences such as altered substrate metabolism, angiogenesis, and cell differentiation. In addition, we examine the proposed relationship between respiratory-related hypoxia, HIFs, and cancer. RECENT FINDINGS HIFs are increased in many forms of cancer, and portend a poor prognosis and response to therapy. CONCLUSION HIFs play a critical role in various stages of carcinogenesis. HIF and its transcription targets may be useful as biomarkers of disease and therapeutic targets for cancer.
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Affiliation(s)
- Jonathan C Jun
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Aman Rathore
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Haris Younas
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
| | - Daniele Gilkes
- Division of Breast Cancer, Department of Oncology, Johns Hopkins University, Baltimore, MD
| | - Vsevolod Y Polotsky
- Division of Pulmonary and Critical Care, Department of Medicine, Johns Hopkins University, Baltimore, MD
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10
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Wigerup C, Påhlman S, Bexell D. Therapeutic targeting of hypoxia and hypoxia-inducible factors in cancer. Pharmacol Ther 2016; 164:152-69. [PMID: 27139518 DOI: 10.1016/j.pharmthera.2016.04.009] [Citation(s) in RCA: 450] [Impact Index Per Article: 56.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Insufficient tissue oxygenation, or hypoxia, contributes to tumor aggressiveness and has a profound impact on clinical outcomes in cancer patients. At decreased oxygen tensions, hypoxia-inducible factors (HIFs) 1 and 2 are stabilized and mediate a hypoxic response, primarily by acting as transcription factors. HIFs exert differential effects on tumor growth and affect important cancer hallmarks including cell proliferation, apoptosis, differentiation, vascularization/angiogenesis, genetic instability, tumor metabolism, tumor immune responses, and invasion and metastasis. As a consequence, HIFs mediate resistance to chemo- and radiotherapy and are associated with poor prognosis in cancer patients. Intriguingly, perivascular tumor cells can also express HIF-2α, thereby forming a "pseudohypoxic" phenotype that further contributes to tumor aggressiveness. Therefore, therapeutic targeting of HIFs in cancer has the potential to improve treatment efficacy. Different strategies to target hypoxic cancer cells and/or HIFs include hypoxia-activated prodrugs and inhibition of HIF dimerization, mRNA or protein expression, DNA binding capacity, and transcriptional activity. Here we review the functions of HIFs in the progression and treatment of malignant solid tumors. We also highlight how HIFs may be targeted to improve the management of patients with therapy-resistant and metastatic cancer.
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Affiliation(s)
- Caroline Wigerup
- Translational Cancer Research, Medicon Village 404:C3, Lund University, Lund, Sweden
| | - Sven Påhlman
- Translational Cancer Research, Medicon Village 404:C3, Lund University, Lund, Sweden.
| | - Daniel Bexell
- Translational Cancer Research, Medicon Village 404:C3, Lund University, Lund, Sweden
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11
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Calderón-Montaño JM, Burgos-Morón E, Orta ML, García-Domínguez I, Maldonado-Navas D, López-Lázaro M. Bufalin is a steroid receptor coactivator inhibitor-letter. Cancer Res 2015; 75:1156. [PMID: 25736686 DOI: 10.1158/0008-5472.can-14-0398] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
| | | | - Manuel Luis Orta
- Department of Cell Biology, Faculty of Biology, University of Seville, Seville, Spain
| | | | | | - Miguel López-Lázaro
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Seville, Spain.
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12
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López-Lázaro M. Two preclinical tests to evaluate anticancer activity and to help validate drug candidates for clinical trials. Oncoscience 2015; 2:91-8. [PMID: 25859551 PMCID: PMC4381701 DOI: 10.18632/oncoscience.132] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 02/18/2015] [Indexed: 11/25/2022] Open
Abstract
Current approaches to assessing preclinical anticancer activity do not reliably predict drug efficacy in cancer patients. Most of the compounds that show remarkable anticancer effects in preclinical models actually fail when tested in clinical trials. We blame these failures on the complexity of the disease and on the limitations of the preclinical tools we require for our research. This manuscript argues that this lack of clinical response may also be caused by poor in vitro and in vivo preclinical designs, in which cancer patients' needs are not fully considered. Then, it proposes two patient-oriented tests to assess in vitro and in vivo anticancer activity and to help validate drug candidates for clinical evaluation.
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Affiliation(s)
- Miguel López-Lázaro
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Spain
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13
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López-Lázaro M. How many times should we screen a chemical library to discover an anticancer drug? Drug Discov Today 2014; 20:167-9. [PMID: 25523188 DOI: 10.1016/j.drudis.2014.12.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/19/2014] [Accepted: 12/08/2014] [Indexed: 10/24/2022]
Affiliation(s)
- Miguel López-Lázaro
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, Spain.
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14
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Lin SC, Liao WL, Lee JC, Tsai SJ. Hypoxia-regulated gene network in drug resistance and cancer progression. Exp Biol Med (Maywood) 2014; 239:779-792. [PMID: 24812122 DOI: 10.1177/1535370214532755] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Hypoxia is a common phenomenon of solid tumors and contributes to aggressive phenotype and treatment failure. Hypoxia-inducible factor (HIF), a versatile transcription factor that regulates more than 5% of total human genes, not only plays important roles in controlling physiological processes, but is also a crucial mediator in hypoxia-induced tumor progression and chemoresistance. Overexpression of HIF-1α is detected in a wide spectrum of cancers via different kinds of mechanisms, including reduced oxygen concentration, loss-of-function of tumor suppressor gene, activating mutation of oncogenes, and hyperactivation of protein kinase signaling pathways. HIF-regulated genes involve in many pathological processes such as metabolic switch, drug efflux, angiogenesis, cell proliferation, and anti-apoptosis, which ultimately leads to increased tumor growth and drug resistance. Due to the common failure of classic chemotherapeutic agents in treating hypoxic cancers, novel strategies have been developed to target tumors under hypoxic conditions including inhibition of HIF activity and administration of bioreductive drugs. These new strategies may provide more effective and specific methods in targeting hypoxic tumors.
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Affiliation(s)
- Shao-Chieh Lin
- Department of Surgery, College of Medicine, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
| | - Wan-Lin Liao
- Department of Physiology, College of Medicine, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
| | - Jenq-Chang Lee
- Department of Surgery, College of Medicine, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
| | - Shaw-Jenq Tsai
- Department of Physiology, College of Medicine, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan
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Evaluating the cancer therapeutic potential of cardiac glycosides. BIOMED RESEARCH INTERNATIONAL 2014; 2014:794930. [PMID: 24895612 PMCID: PMC4033509 DOI: 10.1155/2014/794930] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 04/25/2014] [Accepted: 04/28/2014] [Indexed: 11/23/2022]
Abstract
Cardiac glycosides, also known as cardiotonic steroids, are a group of natural products that share a steroid-like structure with an unsaturated lactone ring and the ability to induce cardiotonic effects mediated by a selective inhibition of the Na+/K+-ATPase. Cardiac glycosides have been used for many years in the treatment of cardiac congestion and some types of cardiac arrhythmias. Recent data suggest that cardiac glycosides may also be useful in the treatment of cancer. These compounds typically inhibit cancer cell proliferation at nanomolar concentrations, and recent high-throughput screenings of drug libraries have therefore identified cardiac glycosides as potent inhibitors of cancer cell growth. Cardiac glycosides can also block tumor growth in rodent models, which further supports the idea that they have potential for cancer therapy. Evidence also suggests, however, that cardiac glycosides may not inhibit cancer cell proliferation selectively and the potent inhibition of tumor growth induced by cardiac glycosides in mice xenografted with human cancer cells is probably an experimental artifact caused by their ability to selectively kill human cells versus rodent cells. This paper reviews such evidence and discusses experimental approaches that could be used to reveal the cancer therapeutic potential of cardiac glycosides in preclinical studies.
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Flahavan EM, Sharp L, Bennett K, Barron TI. A cohort study of digoxin exposure and mortality in men with prostate cancer. BJU Int 2013; 113:236-45. [PMID: 23937513 DOI: 10.1111/bju.12287] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To examine the association between digoxin exposure and mortality in men with prostate cancer using linked Irish National Cancer Registry and pharmacy claims data. PATIENTS AND METHODS Prostate cancer cases were identified from the database and digoxin exposure at prostate cancer diagnosis was identified from prescription claims. Digoxin users were matched to non-users using a propensity score to identify men with similar cardiovascular comorbidity. Adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated for the association between digoxin exposure and all-cause and prostate cancer-specific mortality (PCSM). Analyses were repeated in the propensity score-matched cohort. Effect modification of treatment with radiation or androgen-deprivation therapy by digoxin exposure was also assessed. RESULTS In all, 5732 men with a prostate cancer diagnosis (2001-2006) were identified (digoxin exposed, 391). The median follow-up was 4.3 years. Digoxin exposure was associated with a small non-significant increase in PCSM in the full cohort (HR 1.13, 95% CI 0.91, 1.42) and the propensity. score-matched cohort (HR 1.17, 95% CI 0.88, 1.57). Adjusted HRs for all-cause mortality were increased for digoxin exposed men (HR 1.24, 95% CI 1.07, 1.43). Interactions with treatments received were not significant. CONCLUSIONS These results suggest digoxin exposure is not associated with reduced PCSM. Further investigation of other cardiac glycosides that have shown anti-cancer potential may be warranted.
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Affiliation(s)
- Evelyn M Flahavan
- Department of Pharmacology and Therapeutics, Trinity College, University of Dublin, Dublin, Ireland
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Calderón-Montaño JM, Burgos-Morón E, López-Lázaro M. The in vivo antitumor activity of cardiac glycosides in mice xenografted with human cancer cells is probably an experimental artifact. Oncogene 2013; 33:2947-8. [PMID: 23752179 DOI: 10.1038/onc.2013.229] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- J M Calderón-Montaño
- Faculty of Pharmacy, Department of Pharmacology, University of Seville, Seville, Spain
| | - E Burgos-Morón
- Faculty of Pharmacy, Department of Pharmacology, University of Seville, Seville, Spain
| | - M López-Lázaro
- Faculty of Pharmacy, Department of Pharmacology, University of Seville, Seville, Spain
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Niraula S, Pond G, de Wit R, Eisenberger M, Tannock IF, Joshua AM. Influence of concurrent medications on outcomes of men with prostate cancer included in the TAX 327 study. Can Urol Assoc J 2013; 7:E74-81. [PMID: 23671512 DOI: 10.5489/cuaj.267] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVES The TAX 327 trial was pivotal in establishing docetaxel in castration refractory metastatic prostate cancer. Various commonly prescribed and over-the-counter co-administered medications are thought to exhibit anti-neoplastic properties and/or could potentially have pharmacokinectic interactions with docetaxel lessening the effectiveness of chemotherapy. METHODS To examine the effect of on prostate cancer outcomes within this trial, we examined overall survival, prostate-specific antigen (PSA) response, percent PSA reduction, pain response and QOL responses for 14 families of medications including metformin, digoxin, verapamil, proton pump inhibitors, nitrates, statins, cox-2 inhibitors, warfarin, heparins, ascorbic acid, selenium, tocopherol, antidepressants and erythropoietin. RESULTS Our findings did not reveal any medication that had a significant additive or synergistic effect with docetaxel. We did note, however, that patients on digoxin or verapamil had poorer overall survival, possibly due to a trend of fewer cycles of administered chemotherapy being administered to the verapamil group, consistent with a pharmacokinectic interaction. CONCLUSIONS These data are only hypothesis-generating given the statistical limitations, but may form a basis for similar future analysis in other malignancies. The data suggest the need to be aware of pharmacokinectic interactions with medications that may interact with docetaxel.
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Affiliation(s)
- Saroj Niraula
- Division of Medical Oncology, Princess Margaret Hospital/University of Toronto, Toronto, ON
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Cerella C, Dicato M, Diederich M. Assembling the puzzle of anti-cancer mechanisms triggered by cardiac glycosides. Mitochondrion 2013; 13:225-34. [DOI: 10.1016/j.mito.2012.06.003] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 06/12/2012] [Accepted: 06/19/2012] [Indexed: 02/04/2023]
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Shi D, Guo W, Chen W, Fu L, Wang J, Tian Y, Xiao X, Kang T, Huang W, Deng W. Nicotine promotes proliferation of human nasopharyngeal carcinoma cells by regulating α7AChR, ERK, HIF-1α and VEGF/PEDF signaling. PLoS One 2012; 7:e43898. [PMID: 22952803 PMCID: PMC3432052 DOI: 10.1371/journal.pone.0043898] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2012] [Accepted: 07/30/2012] [Indexed: 01/28/2023] Open
Abstract
Nicotine, the major component in cigarette smoke, can promote tumor growth and angiogenesis, but the precise mechanisms involved remain largely unknown. Here, we investigated the mechanism of action of nicotine in human nasopharyngeal carcinoma (NPC) cells. Nicotine significantly promoted cell proliferation in a dose and time-dependent manner in human NPC cells. The mechanism studies showed that the observed stimulation of proliferation was accompanied by the nicotine-mediated simultaneous modulation of α7AChR, HIF-1α, ERK and VEGF/PEDF signaling. Treatment of NPC cells with nicotine markedly upregulated the expression of α7AChR and HIF-1α proteins. Transfection with a α7AChR or HIF-1α-specific siRNA or a α7AChR-selective inhibitor significantly attenuated the nicotine-mediated promotion of NPC cell proliferation. Nicotine also promoted the phosphorylation of ERK1/2 but not JNK and p38 proteins, thereby induced the activation of ERK/MAPK signaling pathway. Pretreatment with an ERK-selective inhibitor effectively reduced the nicotine-induced proliferation of NPC cells. Moreover, nicotine upregulated the expression of VEGF but suppressed the expression of PEDF at mRNA and protein levels, leading to a significant increase of the ratio of VEGF/PEDF in NPC cells. Pretreatment with a α7AChR or ERK-selective inhibitor or transfection with a HIF-1α-specific siRNA in NPC cells significantly inhibited the nicotine-induced HIF-1α expression and VEGF/PEDF ratio. These results therefore indicate that nicotine promotes proliferation of human NPC cells in vitro through simultaneous modulation of α7AChR, HIF-1α, ERK and VEGF/PEDF signaling and suggest that the related molecules such as HIF-1α might be the potential therapeutic targets for tobacco-associated diseases such as nasopharyngeal carcinomas.
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Affiliation(s)
- Dingbo Shi
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Wei Guo
- Institute of Cancer Stem Cell, Dalian Medical University Cancer Center, Dalian, China
| | - Wangbin Chen
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Lingyi Fu
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Jingshu Wang
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Yung Tian
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Xiangsheng Xiao
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Tiebang Kang
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Wenlin Huang
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
- State Key Laboratory of Targeted Therapy Drug of Guangdong, Guangzhou, China
| | - Wuguo Deng
- State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou, China
- State Key Laboratory of Targeted Therapy Drug of Guangdong, Guangzhou, China
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van Patot MCT, Gassmann M. Hypoxia: adapting to high altitude by mutating EPAS-1, the gene encoding HIF-2α. High Alt Med Biol 2012; 12:157-67. [PMID: 21718164 DOI: 10.1089/ham.2010.1099] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Living at high altitude is demanding and thus drives adaptational mechanisms. The Tibetan population has had a longer evolutionary period to adapt to high altitude than other mountain populations such as Andeans. As a result, some Tibetans living at high altitudes do not show markedly elevated red blood cell production as compared to South American high altitude natives such as Quechuas or Aymaras, thereby avoiding high blood viscosity creating cardiovascular risk. Unexpectedly, the responsible mutation(s) reducing red blood cell production do not involve either the gene encoding the blood hormone erythropoietin (Epo), or the corresponding regulatory sequences flanking the Epo gene. Similarly, functional mutations in the hypoxia-inducible transcription factor 1α (HIF-1α) gene that represents the oxygen-dependent subunit of the HIF-1 heterodimer, the latter being the main regulator of over 100 hypoxia-inducible genes, have not been described so far. It was not until very recently that three independent groups showed that the gene encoding HIF-2α, EPAS-1 (Wenger et al. 1997), represents a key gene mutated in Tibetan populations adapted to living at high altitudes (Beall et al. 2010 , Yi et al. 2010 , Simonson et al. 2010). Hypoxia-inducible transcription factors were first identified by the description of HIF-1 (Semenza et al. 1991 , 1992), which was subsequently found to enhance transcription of multiple genes that encode proteins necessary for rescuing from hypoxic exposure, including erythropoietic, angiogenic and glycolytic proteins. Then HIF-2 was identified (Ema et al. 1997 ; Flamme et al. 1997 ; Hogenesch et al. 1997 ; and Tian et al. 1997) and although it is highly similar to HIF-1 and has the potential to bind (Camenisch et al. 2001) and mediate (Mole et al. 2009) many of the same genes as HIF-1, its biological actions in response to hypoxia are distinct from those of HIF-1 (reviewed by Loboda et al. 2010). By now, several of these HIF-2 mediated processes have been implicated in the human response to high altitude exposure including erythropoiesis (Kapitsinou et al. 2010), iron homeostasis (Peyssonnaux et al. 2008), metabolism (Shohet et al. 2007; Tormos et al. 2010; Biswas et al. 2010 ; Rankin et al. 2009) and vascular permeability (Chen et al. 2009; Tanaka et al. 2005), among others. Clearly, mutation of EPAS-1 has the potential to bring far more advantage when adapting to high altitude than solely mutating the Epo gene.
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Affiliation(s)
- Martha C Tissot van Patot
- Institute of Veterinary Physiology, Vetsuisse Faculty and Zurich Center for Integrative Human Physiology (ZIHP), University of Zürich, Zürich, Switzerland
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Bogdan W, Jerzy W, Eugeniusz S, Joanna P, Marta G. Digoxin increases hydrogen sulfide concentrations in brain, heart and kidney tissues in mice. Pharmacol Rep 2011; 63:1243-7. [DOI: 10.1016/s1734-1140(11)70645-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2010] [Revised: 06/16/2011] [Indexed: 12/20/2022]
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Prassas I, Karagiannis GS, Batruch I, Dimitromanolakis A, Datti A, Diamandis EP. Digitoxin-induced cytotoxicity in cancer cells is mediated through distinct kinase and interferon signaling networks. Mol Cancer Ther 2011; 10:2083-93. [PMID: 21859838 DOI: 10.1158/1535-7163.mct-11-0421] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cardiac glycosides (e.g., digoxin, digitoxin) constitute a diverse family of plant-derived sodium pump inhibitors that have been in clinical use for the treatment of heart-related diseases (congestive heart failure, atrial arrhythmia) for many years. Recently though, accumulating in vitro and in vivo evidence highlight potential anticancer properties of these compounds. Despite the fact that members of this family have advanced to clinical trial testing in cancer therapeutics, their cytotoxic mechanism is not yet elucidated. In this study, we investigated the cytotoxic properties of cardiac glycosides against a panel of pancreatic cancer cell lines, explored their apoptotic mechanism, and characterized the kinetics of cell death induced by these drugs. Furthermore, we deployed a high-throughput kinome screening approach and identified several kinases of the Na-K-ATPase-mediated signal transduction circuitry (epidermal growth factor receptor, Src, pkC, and mitogen-activated protein kinases) as important mediators downstream of cardiac glycoside cytotoxic action. To further extend our knowledge on their mode of action, we used mass-spectrometry-based quantitative proteomics (stable isotope labeling of amino acids in cell culture) coupled with bioinformatics to capture large-scale protein perturbations induced by a physiological dose of digitoxin in BxPC-3 pancreatic cancer cells and identified members of the interferon family as key regulators of the main protein/protein interactions downstream of digitoxin action. Hence, our findings provide more in-depth information regarding the molecular mechanisms underlying cardiac glycoside-induced cytotoxicity.
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Affiliation(s)
- Ioannis Prassas
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Canada
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McCarty MF, Barroso-Aranda J, Contreras F. Practical strategies for suppressing hypoxia-inducible factor activity in cancer therapy. Med Hypotheses 2010; 74:789-97. [PMID: 20089365 DOI: 10.1016/j.mehy.2009.12.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Accepted: 12/16/2009] [Indexed: 12/18/2022]
Abstract
The utility of anti-angiogenic strategies for cancer control is strongly compromised by hypoxia-driven phenotypic changes in cancer cells, which make cancer cells more invasive and more prone to give rise to metastases. A key mediator of this phenotypic shift is the transcription factor hypoxia-inducible factor-1 (HIF-1), which acts directly and indirectly to promote the epidermal-mesenchymal transition, boost cancer invasiveness, increase production of angiogenic factors, and induce chemoresistance. In some cancers, HIF-1 activity is constitutively elevated even in aerobic environments, making the cancer harder to treat and control. Practical strategies for suppressing HIF-1 activation may include the following: inhibiting NF-kappaB activation with salicylic acid and/or silibinin, which should decrease transcription of the HIF-1alpha gene; suppressing translation of HIF-1alpha mRNA with drugs that inhibit mTOR or topoisomerase I; supporting the effective activity of prolyl hydroxylases - which promote proteasomal degradation of HIF-1alpha under aerobic conditions - with antioxidant measures, alpha-ketoglutarate, and possibly dichloroacetate; promoting the O(2)-independent proteasomal degradation of HIF-1alpha with agents that inhibit the chaperone protein Hsp90; and blocking HIF-1 binding to its DNA response elements with anthracyclines. The utility of various combinations of these strategies should be tested in cancer cell cultures and rodent xenograft models; initial efforts in this regard have yielded encouraging results. Comprehensive strategies for suppressing HIF-1 activity can be expected to complement the efficacy of cancer chemotherapy and of effective anti-angiogenic regimens.
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Affiliation(s)
- Mark F McCarty
- Oasis of Hope Hospital, Paseo Playas 19, Playas de Tijuana, Tijuana, B.C., Mexico.
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