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Farmaki E, Nath A, Emond R, Karimi KL, Grolmusz VK, Cosgrove PA, Bild AH. ONC201/TIC10 enhances durability of mTOR inhibitor everolimus in metastatic ER+ breast cancer. eLife 2023; 12:e85898. [PMID: 37772709 PMCID: PMC10541180 DOI: 10.7554/elife.85898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 08/17/2023] [Indexed: 09/30/2023] Open
Abstract
The mTOR inhibitor, everolimus, is an important clinical management component of metastatic ER+ breast cancer (BC). However, most patients develop resistance and progress on therapy, highlighting the need to discover strategies that increase mTOR inhibitor effectiveness. We developed ER+ BC cell lines, sensitive or resistant to everolimus, and discovered that combination treatment of ONC201/TIC10 with everolimus inhibited cell growth in 2D/3D in vitro studies. We confirmed increased therapeutic response in primary patient cells progressing on everolimus, supporting clinical relevance. We show that ONC201/TIC10 mechanism in metastatic ER+ BC cells involves oxidative phosphorylation inhibition and stress response activation. Transcriptomic analysis in everolimus resistant breast patient tumors and mitochondrial functional assays in resistant cell lines demonstrated increased mitochondrial respiration dependency, contributing to ONC201/TIC10 sensitivity. We propose that ONC201/TIC10 and modulation of mitochondrial function may provide an effective add-on therapy strategy for patients with metastatic ER+ BCs resistant to mTOR inhibitors.
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Affiliation(s)
- Elena Farmaki
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Aritro Nath
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Rena Emond
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Kimya L Karimi
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Vince K Grolmusz
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Patrick A Cosgrove
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
| | - Andrea H Bild
- Department of Medical Oncology and Therapeutics Research, City of Hope National Medical CenterDuarteUnited States
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Temaj G, Saha S, Dragusha S, Ejupi V, Buttari B, Profumo E, Beqa L, Saso L. Ribosomopathies and cancer: pharmacological implications. Expert Rev Clin Pharmacol 2022; 15:729-746. [PMID: 35787725 DOI: 10.1080/17512433.2022.2098110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION The ribosome is a ribonucleoprotein organelle responsible for protein synthesis, and its biogenesis is a highly coordinated process that involves many macromolecular components. Any acquired or inherited impairment in ribosome biogenesis or ribosomopathies is associated with the development of different cancers and rare genetic diseases. Interference with multiple steps of protein synthesis has been shown to promote tumor cell death. AREAS COVERED We discuss the current insights about impaired ribosome biogenesis and their secondary consequences on protein synthesis, transcriptional and translational responses, proteotoxic stress, and other metabolic pathways associated with cancer and rare diseases. Studies investigating the modulation of different therapeutic chemical entities targeting cancer in in vitro and in vivo models have also been detailed. EXPERT OPINION Despite the association between inherited mutations affecting ribosome biogenesis and cancer biology, the development of therapeutics targeting the essential cellular machinery has only started to emerge. New chemical entities should be designed to modulate different checkpoints (translating oncoproteins, dysregulation of specific ribosome-assembly machinery, ribosomal stress, and rewiring ribosomal functions). Although safe and effective therapies are lacking, consideration should also be given to using existing drugs alone or in combination for long-term safety, with known risks for feasibility in clinical trials and synergistic effects.
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Affiliation(s)
| | - Sarmistha Saha
- Department of Cardiovascular, Endocrine-metabolic Diseases, and Aging, Italian National Institute of Health, Rome, Italy
| | | | - Valon Ejupi
- College UBT, Faculty of Pharmacy, Prishtina, Kosovo
| | - Brigitta Buttari
- Department of Cardiovascular, Endocrine-metabolic Diseases, and Aging, Italian National Institute of Health, Rome, Italy
| | - Elisabetta Profumo
- Department of Cardiovascular, Endocrine-metabolic Diseases, and Aging, Italian National Institute of Health, Rome, Italy
| | - Lule Beqa
- College UBT, Faculty of Pharmacy, Prishtina, Kosovo
| | - Luciano Saso
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, Italy
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Mehmood S, Faheem M, Ismail H, Farhat SM, Ali M, Younis S, Asghar MN. ‘Breast Cancer Resistance Likelihood and Personalized Treatment Through Integrated Multiomics’. Front Mol Biosci 2022; 9:783494. [PMID: 35495618 PMCID: PMC9048735 DOI: 10.3389/fmolb.2022.783494] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 03/14/2022] [Indexed: 12/24/2022] Open
Abstract
In recent times, enormous progress has been made in improving the diagnosis and therapeutic strategies for breast carcinoma, yet it remains the most prevalent cancer and second highest contributor to cancer-related deaths in women. Breast cancer (BC) affects one in eight females globally. In 2018 alone, 1.4 million cases were identified worldwide in postmenopausal women and 645,000 cases in premenopausal females, and this burden is constantly increasing. This shows that still a lot of efforts are required to discover therapeutic remedies for this disease. One of the major clinical complications associated with the treatment of breast carcinoma is the development of therapeutic resistance. Multidrug resistance (MDR) and consequent relapse on therapy are prevalent issues related to breast carcinoma; it is due to our incomplete understanding of the molecular mechanisms of breast carcinoma disease. Therefore, elucidating the molecular mechanisms involved in drug resistance is critical. For management of breast carcinoma, the treatment decision not only depends on the assessment of prognosis factors but also on the evaluation of pathological and clinical factors. Integrated data assessments of these multiple factors of breast carcinoma through multiomics can provide significant insight and hope for making therapeutic decisions. This omics approach is particularly helpful since it identifies the biomarkers of disease progression and treatment progress by collective characterization and quantification of pools of biological molecules within and among the cancerous cells. The scrupulous understanding of cancer and its treatment at the molecular level led to the concept of a personalized approach, which is one of the most significant advancements in modern oncology. Likewise, there are certain genetic and non-genetic tests available for BC which can help in personalized therapy. Genetically inherited risks can be screened for personal predisposition to BC, and genetic changes or variations (mutations) can also be identified to decide on the best treatment. Ultimately, further understanding of BC at the molecular level (multiomics) will define more precise choices in personalized medicine. In this review, we have summarized therapeutic resistance associated with BC and the techniques used for its management.
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Affiliation(s)
- Sabba Mehmood
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
- *Correspondence: Sabba Mehmood, ; Muhammad Nadeem Asghar,
| | - Muhammad Faheem
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Hammad Ismail
- Department of Biochemistry & Biotechnology University of Gujrat, Gujrat, Pakistan
| | - Syeda Mehpara Farhat
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Mahwish Ali
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Sidra Younis
- Department of Biological Sciences, National University of Medical Sciences, Rawalpindi, Pakistan
| | - Muhammad Nadeem Asghar
- Department of Medical Biology, University of Québec at Trois-Rivieres, Trois-Rivieres, QC, Canada
- *Correspondence: Sabba Mehmood, ; Muhammad Nadeem Asghar,
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4
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Golden E, Rashwan R, Woodward EA, Sgro A, Wang E, Sorolla A, Waryah C, Tie WJ, Cuyàs E, Ratajska M, Kardaś I, Kozlowski P, Johnstone EKM, See HB, Duffy C, Parry J, Lagerborg KA, Czapiewski P, Menendez JA, Gorczyński A, Wasag B, Pfleger KDG, Curtis C, Lee BK, Kim J, Cursons J, Pavlos NJ, Biernat W, Jain M, Woo AJ, Redfern A, Blancafort P. The oncogene AAMDC links PI3K-AKT-mTOR signaling with metabolic reprograming in estrogen receptor-positive breast cancer. Nat Commun 2021; 12:1920. [PMID: 33772001 PMCID: PMC7998036 DOI: 10.1038/s41467-021-22101-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 02/25/2021] [Indexed: 12/13/2022] Open
Abstract
Adipogenesis associated Mth938 domain containing (AAMDC) represents an uncharacterized oncogene amplified in aggressive estrogen receptor-positive breast cancers. We uncover that AAMDC regulates the expression of several metabolic enzymes involved in the one-carbon folate and methionine cycles, and lipid metabolism. We show that AAMDC controls PI3K-AKT-mTOR signaling, regulating the translation of ATF4 and MYC and modulating the transcriptional activity of AAMDC-dependent promoters. High AAMDC expression is associated with sensitization to dactolisib and everolimus, and these PI3K-mTOR inhibitors exhibit synergistic interactions with anti-estrogens in IntClust2 models. Ectopic AAMDC expression is sufficient to activate AKT signaling, resulting in estrogen-independent tumor growth. Thus, AAMDC-overexpressing tumors may be sensitive to PI3K-mTORC1 blockers in combination with anti-estrogens. Lastly, we provide evidence that AAMDC can interact with the RabGTPase-activating protein RabGAP1L, and that AAMDC, RabGAP1L, and Rab7a colocalize in endolysosomes. The discovery of the RabGAP1L-AAMDC assembly platform provides insights for the design of selective blockers to target malignancies having the AAMDC amplification.
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Affiliation(s)
- Emily Golden
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Rabab Rashwan
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- Department of Microbiology and Immunology, Faculty of Medicine, Minia University, Minia, Egypt
| | - Eleanor A Woodward
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Agustin Sgro
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- School of Human Sciences, The University of Western Australia, Perth, WA, Australia
| | - Edina Wang
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Anabel Sorolla
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Charlene Waryah
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Wan Jun Tie
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
| | - Elisabet Cuyàs
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Girona Biomedical Research Institute, Girona, Catalonia, Spain
- ProCURE (Program Against Cancer Therapeutic Resistance), Metabolism & Cancer Group, Catalan Institute of Oncology, Girona, Catalonia, Spain
| | - Magdalena Ratajska
- Department of Biology and Medical Genetics, Medical University of Gdansk, Gdansk, Poland
- The Centre for Cell Therapy and Regenerative Medicine, School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
- Department of Pathology, Otago University, Dunedin, New Zealand
| | - Iwona Kardaś
- Department of Biology and Medical Genetics, Medical University of Gdansk, Gdansk, Poland
- Laboratory of Clinical Genetics, University Clinical Centre, Gdansk, Poland
| | - Piotr Kozlowski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland
| | - Elizabeth K M Johnstone
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- Molecular Endocrinology and Pharmacology, Harry Perkins Institute of Medical Research, Nedlands, WA, Australia
- Australian Research Council Centre for Personalised Therapeutics Technologies, Melbourne and Perth, Australia
| | - Heng B See
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- Molecular Endocrinology and Pharmacology, Harry Perkins Institute of Medical Research, Nedlands, WA, Australia
- Australian Research Council Centre for Personalised Therapeutics Technologies, Melbourne and Perth, Australia
| | - Ciara Duffy
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- School of Human Sciences, The University of Western Australia, Perth, WA, Australia
| | - Jeremy Parry
- Department of Anatomical Pathology, Path West Laboratory, Fiona Stanley Hospital Network, Murdoch, WA, Australia
| | - Kim A Lagerborg
- Departments of Medicine and Pharmacology, University of California, San Diego, CA, USA
| | - Piotr Czapiewski
- Department of Pathomorphology, Medical University of Gdansk, Gdansk, Poland
- Institute of Pathology, Dessau Medical Centre, Dessau, Germany
| | - Javier A Menendez
- Girona Biomedical Research Institute, Girona, Catalonia, Spain
- ProCURE (Program Against Cancer Therapeutic Resistance), Metabolism & Cancer Group, Catalan Institute of Oncology, Girona, Catalonia, Spain
| | - Adam Gorczyński
- Department of Pathomorphology, Medical University of Gdansk, Gdansk, Poland
| | - Bartosz Wasag
- Department of Biology and Medical Genetics, Medical University of Gdansk, Gdansk, Poland
- Laboratory of Clinical Genetics, University Clinical Centre, Gdansk, Poland
| | - Kevin D G Pfleger
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- Molecular Endocrinology and Pharmacology, Harry Perkins Institute of Medical Research, Nedlands, WA, Australia
- Australian Research Council Centre for Personalised Therapeutics Technologies, Melbourne and Perth, Australia
- Dimerix Limited, Nedlands, WA, Australia
| | - Christina Curtis
- Stanford University School of Medicine (Departments of Medicine & Genetics) and Stanford Cancer Institute, Stanford, CA, USA
| | - Bum-Kyu Lee
- Department of Biomedical Sciences, Cancer Research Center, University at Albany-State University of New York, Rensselaer, NY, USA
| | - Jonghwan Kim
- Department of Molecular Biosciences, Center for Systems and Synthetic Biology, The University of Texas at Austin, Austin, TX, USA
| | - Joseph Cursons
- Biomedicine Discovery Institute & Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, Australia
| | - Nathan J Pavlos
- The Centre for Cell Therapy and Regenerative Medicine, School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
- School of Biomedical Sciences, The University of Western Australia, Perth, WA, Australia
| | - Wojciech Biernat
- Department of Pathomorphology, Medical University of Gdansk, Gdansk, Poland
| | - Mohit Jain
- Departments of Medicine and Pharmacology, University of California, San Diego, CA, USA
| | - Andrew J Woo
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia
- School of Medical and Health Sciences, Edith Cowan University, Perth, WA, Australia
| | - Andrew Redfern
- School of Medicine, University of Western Australia, Perth, WA, Australia
| | - Pilar Blancafort
- Cancer Epigenetics Group, The Harry Perkins Institute of Medical Research, The University of Western Australia, Perth, WA, Australia.
- Centre for Medical Research, The University of Western Australia, Perth, WA, Australia.
- School of Human Sciences, The University of Western Australia, Perth, WA, Australia.
- The Greehey Children's Cancer Research Institute, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
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Li F, Gu F, Li Q, Zhai C, Gong R, Zhu X. ROR1-AS1 knockdown inhibits growth and invasion and promotes apoptosis in NSCLC cells by suppression of the PI3K/Akt/mTOR pathway. J Biochem Mol Toxicol 2021; 35:e22726. [PMID: 33491326 DOI: 10.1002/jbt.22726] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 11/26/2020] [Accepted: 01/09/2021] [Indexed: 11/07/2022]
Abstract
The role of ROR1-AS1 in non-small-cell lung cancer (NSCLC) remains unclear. Therefore, we aimed to investigate the functional role of ROR1-AS1 in NSCLC and to explore the underlying mechanisms. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide assay was performed to detect cell proliferation. Transwell assay was performed to evaluate cell invasive ability. Cell apoptotic rates and caspase-3/7 activity were determined to evaluate apoptosis. The expression levels of PI3K/Akt/mTOR pathway-related proteins were measured using Western blot analysis. Results showed that ROR1-AS1 expression was upregulated in NSCLC samples. Knockdown of ROR1-AS1 inhibited the viability and invasive ability of NSCLC cells. Knockdown of ROR1-AS1 induced apoptotic rate and caspase-3/7 activity and suppressed xenograft NSCLC tumor growth. In addition, ROR1-AS1 knockdown inhibited the activation of the PI3K/Akt/mTOR pathway in NSCLC cells. However, treatment with 740Y-P prevented the effects of si-ROR1-AS1 on viability, invasive ability, and apoptosis of NSCLC cells. These findings implied that ROR1-AS1 played an oncogenic role in NSCLC via regulating the PI3K/Akt/mTOR pathway.
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Affiliation(s)
- Fengbo Li
- Department of Respiratory Medicine, Nanshi Hospital, Nanyang, China
| | - Fengming Gu
- Department of Intensive Care, The Affiliated Huai'an Hospital of Xuzhou Medical University, The Second People's Hospital of Huai'an, Huai'an, China
| | - Qian Li
- Department of Respiratory Medicine, Nanshi Hospital, Nanyang, China
| | - Chaoshuan Zhai
- Department of Respiratory Medicine, Nanshi Hospital, Nanyang, China
| | - Rui Gong
- Department of Respiratory Medicine, Nanshi Hospital, Nanyang, China
| | - Xuezhuan Zhu
- Department of Intensive Care, Lianshui People's Hospital Affiliated to Kangda College of Nanjing Medical University, Huai'an, China
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Verma P, Mittal P, Singh A, Singh IK. New Entrants into Clinical Trials for Targeted Therapy of Breast Cancer: An Insight. Anticancer Agents Med Chem 2020; 19:2156-2176. [PMID: 31656157 DOI: 10.2174/1871520619666191018172926] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 08/07/2019] [Accepted: 08/07/2019] [Indexed: 02/08/2023]
Abstract
Breast cancer is too complex with various different molecular alterations involved in its pathogenesis and progression. Over the decade, we have seen a surge in the development of drugs for bimolecular targets and for the signal transduction pathways involved in the treatment line of breast cancer. These drugs, either alone or in combination with conventional treatments like chemotherapy, hormone therapy and radiotherapy, will help oncologists to get a better insight and do the needful treatment. These novel therapies bring various challenges along with them, which include the dosage selection, patient selection, schedule of treatment and weighing of clinical benefits over side effects. In this review, we highlight the recently studied target molecules that have received indications in breast carcinoma, both in the localized and in an advanced state and about their inhibitors which are in clinical development which can give the immense potential to clinical care in the near future.
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Affiliation(s)
- Priyanka Verma
- Molecular Biology Research Lab, Department of Zoology, Deshbandhu College, University of Delhi, Kalkaji, New Delhi, 110019, India
| | - Pooja Mittal
- Molecular Biology Research Lab, Department of Zoology, Deshbandhu College, University of Delhi, Kalkaji, New Delhi, 110019, India
| | - Archana Singh
- Department of Botany, Hansraj College, University of Delhi, New Delhi, 110007, India.,Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745 Jena, Germany
| | - Indrakant K Singh
- Molecular Biology Research Lab, Department of Zoology, Deshbandhu College, University of Delhi, Kalkaji, New Delhi, 110019, India.,Department of Molecular Ecology, Max-Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, D-07745 Jena, Germany
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Combes FP, Einolf HJ, Coello N, Heimbach T, He H, Grosch K. Model-Informed Drug Development for Everolimus Dosing Selection in Pediatric Infant Patients. CPT-PHARMACOMETRICS & SYSTEMS PHARMACOLOGY 2020; 9:230-237. [PMID: 32150661 PMCID: PMC7180003 DOI: 10.1002/psp4.12502] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 01/16/2020] [Indexed: 01/02/2023]
Abstract
Everolimus is currently approved in Europe as an adjunctive therapy for patients aged ≥ 2 years with tuberous sclerosis complex (TSC)–associated treatment‐refractory partial‐onset seizures, based on the EXIST‐3 study (NCT01713946) results. As TSC‐associated seizures can also affect children aged between 6 months and 2 years, a modeling and simulation (M&S) approach was undertaken to extrapolate exposure (trough plasma concentration (Cmin)) after a dose of 6 mg/m2 and reduction in seizure frequency (RSF). A physiologically based pharmacokinetic model using Simcyp was developed to predict Cmin in adult and pediatric patients, which was then used by a population pharmacodynamic model and a linear mixed effect model to predict short‐term and long‐term efficacy in adults (for validation) and in children, respectively. Based on the results of the M&S study, everolimus at the dose of 6 mg/m2 is anticipated to be an efficacious treatment in children 6 months to 2 years of age (up to 77.8% RSF) with concentrations within the recommended target range.
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Affiliation(s)
| | - Heidi J Einolf
- Novartis Pharmaceuticals Corporation, East Hanover, New Jersey, USA
| | | | - Tycho Heimbach
- Novartis Pharmaceuticals Corporation, East Hanover, New Jersey, USA
| | - Handan He
- Novartis Pharmaceuticals Corporation, East Hanover, New Jersey, USA
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B591, a novel specific pan-PI3K inhibitor, preferentially targets cancer stem cells. Oncogene 2019; 38:3371-3386. [PMID: 30635656 PMCID: PMC6756013 DOI: 10.1038/s41388-018-0674-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 12/06/2018] [Accepted: 12/18/2018] [Indexed: 12/17/2022]
Abstract
Cancer stem cells (CSCs) have been implicated in metastasis, relapse, and therapeutic resistance of cancer, so successful cancer therapy may therefore require the development of drugs against CSCs or combining anti-CSCs drugs with conventional therapies. The phosphoinositide 3-kinase (PI3K) signaling pathway is one of the most frequently activated signaling pathways in human cancer, playing a central role in tumorigenesis as well as the maintenance of CSCs. Here, we designed and identified B591, a dihydrobenzofuran-imidazolium salt, as a novel specific pan-PI3K inhibitor with potent inhibitory activity against class I PI3K isoforms, which showed effective inhibition of cellular PI3K/mTOR signaling pathway and robust antitumor activity in a set of cancer cell lines. Notably, compared with bulk tumor cell populations, B591 exhibited more potency in suppressing CSCs survival and inducing CSCs apoptosis, and presence of B591 effectively eliminated paclitaxel-enriched CSCs. B591 diminished self-renewal capacity and decreased the expression of epithelial-mesenchymal transition (EMT) markers of CSCs. In vivo, B591 preferentially decreased CSCs levels in mouse xenograft model of human breast cancer as evidenced especially by remarkable reduction of tumor-initiating ability. Consistent with the preferential targeting of CSCs, B591 effectively inhibited breast tumor metastasis and delayed tumor regrowth following paclitaxel treatment. Taken together, our findings establish B591, a novel PI3K inhibitor, as a strong candidate for clinical evaluation as a CSCs targeting agent.
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Zhang J, Wang G, Zhou Y, Chen Y, Ouyang L, Liu B. Mechanisms of autophagy and relevant small-molecule compounds for targeted cancer therapy. Cell Mol Life Sci 2018; 75:1803-1826. [PMID: 29417176 PMCID: PMC11105210 DOI: 10.1007/s00018-018-2759-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 01/15/2018] [Accepted: 01/23/2018] [Indexed: 02/05/2023]
Abstract
Autophagy is an evolutionarily conserved, multi-step lysosomal degradation process for the clearance of damaged or superfluous proteins and organelles. Accumulating studies have recently revealed that autophagy is closely related to a variety of types of cancer; however, elucidation of its Janus role of either tumor-suppressive or tumor-promoting still remains to be discovered. In this review, we focus on summarizing the context-dependent role of autophagy and its complicated molecular mechanisms in different types of cancer. Moreover, we discuss a series of small-molecule compounds targeting autophagy-related proteins or the autophagic process for potential cancer therapy. Taken together, these findings would shed new light on exploiting the intricate mechanisms of autophagy and relevant small-molecule compounds as potential anti-cancer drugs to improve targeted cancer therapy.
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Affiliation(s)
- Jin Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, 610041, China
| | - Guan Wang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, 610041, China
| | - Yuxin Zhou
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, 610041, China
- College of Biological Sciences, China Agricultural University, Beijing, 100193, China
| | - Yi Chen
- Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Liang Ouyang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, 610041, China
| | - Bo Liu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, and Collaborative Innovation Center of Biotherapy, Chengdu, 610041, China.
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10
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Lai ZY, Yeo HY, Chen YT, Chang KM, Chen TC, Chuang YJ, Chang SJ. PI3K inhibitor enhances the cytotoxic response to etoposide and cisplatin in a newly established neuroendocrine cervical carcinoma cell line. Oncotarget 2018; 8:45323-45334. [PMID: 28484083 PMCID: PMC5542189 DOI: 10.18632/oncotarget.17335] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 04/12/2017] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND Neuroendocrine cervical carcinoma (NECC) is a rare and aggressive subtype of cervical cancer. To date, no NECC cell-based model is available, which hinders the development of new therapeutic strategies for NECC. In this study, we derived a new NECC cell line from an ex vivo biopsy and used it to explore novel drug combination approach for NECC. RESULTS The stable HM-1 cell line displayed high expression levels of the neuroendocrine marker, synaptophysin. HM-1 cell transplantation could induce tumor growth in nude mice. As expected, the combination of etoposide and cisplatin synergistically inhibited HM-1 cell proliferation. Strikingly, when etoposide and cisplatin were combined with PI3K inhibitor BEZ235, the growth of HM-1 cells was significantly reduced. Taken together, the data implied the combination of etoposide and cisplatin with BEZ235 not only inhibited HM-1 cell proliferation but also increased cell apoptosis. MATERIALS AND METHODS A NECC tissue sample from a 75-year-old female patient was processed to derive a primary cell line annotated as HM-1. The features of HM-1 were analyzed to establish its characteristic profile. Next, HM-1 was treated with PI3K inhibitors, BKM120 and/or BEZ235, in combination with two well-known genotoxic drugs, etoposide and/or cisplatin, to evaluate which combination could serve as a more effective treatment approach. Their inhibiting effects on HM-1 were evaluated by cell viability, apoptosis, and target kinase expression. CONCLUSIONS The newly established NECC cell line HM-1 could serve as a cell-based model for NECC research. The synergistic drug combination of PI3K inhibitor with genotoxic drugs might become a potential new treatment strategy against NECC.
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Affiliation(s)
- Zih-Yin Lai
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30013, Taiwan (R.O.C.)
| | - Hsin-Yueh Yeo
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30013, Taiwan (R.O.C.)
| | - Ya-Tse Chen
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30013, Taiwan (R.O.C.)
| | - Kuo-Ming Chang
- Department of Pathology, Hsinchu MacKay Memorial Hospital, Hsinchu, 30071, Taiwan (R.O.C.)
| | - Tze-Chien Chen
- Department of Obstetrics and Gynecology, MacKay Memorial Hospital, Taipei, 10449, Taiwan (R.O.C.)
| | - Yung-Jen Chuang
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30013, Taiwan (R.O.C.)
| | - Shing-Jyh Chang
- Department of Obstetrics and Gynecology, Hsinchu MacKay Memorial Hospital, Hsinchu, 30071, Taiwan (R.O.C.)
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11
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Du L, Li X, Zhen L, Chen W, Mu L, Zhang Y, Song A. Everolimus inhibits breast cancer cell growth through PI3K/AKT/mTOR signaling pathway. Mol Med Rep 2018; 17:7163-7169. [PMID: 29568883 PMCID: PMC5928673 DOI: 10.3892/mmr.2018.8769] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 10/30/2017] [Indexed: 01/14/2023] Open
Abstract
Breast cancer is one of the most prevalent malignancies and the leading cause of cancer‑associated mortality in women worldwide and in China. Everolimus (C53H83NO14) is an efficient anti-cancer drug for breast cancer which targets mammalian target of rapamycin (mTOR). The present study investigated the inhibitory effects of everolimus on breast cancer cells and an MCF‑7‑bearing mouse model. The potential mechanism of the everolimus‑mediated decrease in growth and aggressiveness of breast cancer cells was reported. Results demonstrated that everolimus significantly inhibited breast cancer cell growth, migration and invasion. It was demonstrated that everolimus induced apoptosis through decreasing B cell lymphoma (Bcl)‑2 and Bcl‑w and increasing caspase‑3 and caspase‑8 expression levels in breast cancer cells. It was observed that everolimus decreased phosphoinositide 3‑kinase (PI3K), protein kinase B (AKT) and mTOR expression levels in breast cancer cells. Results additionally demonstrated that PI3 K overexpression prevented that everolimus‑mediated inhibition of growth and aggressiveness in MCF‑7 cells. In vivo assays demonstrated that everolimus treatment markedly inhibited tumor growth in the MCF‑7 bearing mouse model. Overall, these data indicate that everolimus inhibits growth and aggressiveness of breast cancer cells through the PI3K/AKT/mTOR signaling pathways, suggesting the PI3K/AKT/mTOR signaling pathway may act as a therapeutic target for the treatment of human cancer.
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Affiliation(s)
- Liyan Du
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Xiaomei Li
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Linhong Zhen
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Weiling Chen
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Lingguang Mu
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Yang Zhang
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
| | - Ailin Song
- Department of Breast Surgery, Xingtai First Hospital, Xingtai, Hebei 054001, P.R. China
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12
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Men X, Ma J, Wu T, Pu J, Wen S, Shen J, Wang X, Wang Y, Chen C, Dai P. Transcriptome profiling identified differentially expressed genes and pathways associated with tamoxifen resistance in human breast cancer. Oncotarget 2017; 9:4074-4089. [PMID: 29423105 PMCID: PMC5790522 DOI: 10.18632/oncotarget.23694] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 12/15/2017] [Indexed: 12/18/2022] Open
Abstract
Tamoxifen (TAM) resistance is an important clinical problem in the treatment of breast cancer. In order to identify the mechanism of TAM resistance for estrogen receptor (ER)-positive breast cancer, we screened the transcriptome using RNA-seq and compared the gene expression profiles between the MCF-7 mamma carcinoma cell line and the TAM-resistant cell line TAMR/MCF-7, 52 significant differential expression genes (DEGs) were identified including SLIT2, ROBO, LHX, KLF, VEGFC, BAMBI, LAMA1, FLT4, PNMT, DHRS2, MAOA and ALDH. The DEGs were annotated in the GO, COG and KEGG databases. Annotation of the function of the DEGs in the KEGG database revealed the top three pathways enriched with the most DEGs, including pathways in cancer, the PI3K-AKT pathway, and focal adhesion. Then we compared the gene expression profiles between the Clinical progressive disease (PD) and the complete response (CR) from the cancer genome altas (TCGA). 10 common DEGs were identified through combining the clinical and cellular analysis results. Protein-protein interaction network was applied to analyze the association of ER signal pathway with the 10 DEGs. 3 significant genes (GFRA3, NPY1R and PTPRN2) were closely related to ER related pathway. These significant DEGs regulated many biological activities such as cell proliferation and survival, motility and migration, and tumor cell invasion. The interactions between these DEGs and drug resistance phenomenon need to be further elucidated at a functional level in further studies. Based on our findings, we believed that these DEGs could be therapeutic targets, which can be explored to develop new treatment options.
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Affiliation(s)
- Xin Men
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Jun Ma
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Tong Wu
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Junyi Pu
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Shaojia Wen
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Jianfeng Shen
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Xun Wang
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Yamin Wang
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Chao Chen
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
| | - Penggao Dai
- National Engineering Research Center for Miniaturized Detection Systems, College of Life Science, Northwest University, Xi'an, PR China
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13
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The role of pparγ and autophagy in ros production, lipid droplets biogenesis and its involvement with colorectal cancer cells modulation. Cancer Cell Int 2017; 17:82. [PMID: 28932171 PMCID: PMC5603033 DOI: 10.1186/s12935-017-0451-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 08/31/2017] [Indexed: 12/15/2022] Open
Abstract
Background In cancer cells, autophagy can act as both tumor suppressor, when autophagic event eliminates cellular contends which exceeds the cellular capacity of regenerate promoting cell death, and as a pro-survival agent removing defective organelles and proteins and helping well-established tumors to maintain an accelerated metabolic state while still dealing with harsh conditions, such as inflammation. Many pathways can coordinate the autophagic process and one of them involves the transcription factors called PPARs, which also regulate cellular differentiation, proliferation and survival. The PPARγ activation and autophagy initiation seems to be interrelated in a variety of cell types. Methods Caco-2 cells were submitted to treatment with autophagy and PPARγ modulators and the relationship between both pathways was determined by western blotting and confocal microscopy. The effects of such modulations on Caco-2 cells, such as lipid bodies biogenesis, cell death, proliferation, cell cycle, ROS production and cancer stem cells profiling were analyzed by flow cytometry. Results PPARγ and autophagy pathways seem to be overlap in Caco-2 cells, modulating each other in different ways and determining the lipid bodies biogenesis. In general, inhibition of autophagy by 3-MA leaded to reduced cell proliferation, cell cycle arrest and, ultimately, cell death by apoptosis. In agreement with these results, ROS production was increased in 3-MA treated cells. Autophagy also seems to play an important role in cancer stem cells profiling. Rapamycin and 3-MA induced epithelial and mesenchymal phenotypes, respectively. Conclusions This study helps to elucidate in which way the induction or inhibition of these pathways regulate each other and affect cellular properties, such as ROS production, lipid bodies biogenesis and cell survive. We also consolidate autophagy as a key factor for colorectal cancer cells survival in vitro, pointing out a potential side effect of autophagic inhibition as a therapeutic application for this disease and demonstrate a novel regulation of PPARγ expression by inhibition of PI3K III. Electronic supplementary material The online version of this article (doi:10.1186/s12935-017-0451-5) contains supplementary material, which is available to authorized users.
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14
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Zhang CH, Wang J, Zhang LX, Lu YH, Ji TH, Xu L, Ling LJ. Shikonin reduces tamoxifen resistance through long non-coding RNA uc.57. Oncotarget 2017; 8:88658-88669. [PMID: 29179465 PMCID: PMC5687635 DOI: 10.18632/oncotarget.20809] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 08/23/2017] [Indexed: 02/07/2023] Open
Abstract
Tamoxifen resistance is a serious problem in the endocrine therapy of breast cancer. Long non-coding RNAs play important roles in tumor development. In this study, we revealed the involvement of lncRNA uc.57 and its downstream gene BCL11A in TAM resistance. Tamoxifen-resistant MCF-7R cells showed lower expression of uc.57 and higher expression of BCL11A mRNA and protein than the parental MCF-7 cells. Moreover, levels of uc.57 mRNA were lower and BCL11A mRNA were higher in breast cancer tissues than in precancerous breast tissues. Shikonin treatment reduced tamoxifen resistance in MCF-7R cells both in vitro and in vivo, targeting uc.57/BCL11A. Fluorescence in situ hybridization and RNA immunoprecipitation analyses showed that uc.57 binds to BCL11A. Uc.57 overexpression downregulated BCL11A and reduced tamoxifen resistance in MCF-7R cells both in vitro and in vivo. BCL11A knockdown also reduced tamoxifen resistance by inhibiting PI3K/AKT and MAPK signaling pathways. It thus appears shikonin reduces tamoxifen resistance of MCF-7R breast cancer cells by inducing uc.57, which downregulates BCL11A to inhibit PI3K/AKT and MAPK signaling pathways.
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Affiliation(s)
- Chen-Han Zhang
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jue Wang
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Lin-Xin Zhang
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yi-Han Lu
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Tian-Hao Ji
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Lu Xu
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Li-Jun Ling
- Breast disease division, First Affiliated Hospital with Nanjing Medical University, Nanjing, Jiangsu Province, China
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15
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Bahrami A, Khazaei M, Shahidsales S, Hassanian SM, Hasanzadeh M, Maftouh M, Ferns GA, Avan A. The Therapeutic Potential of PI3K/Akt/mTOR Inhibitors in Breast Cancer: Rational and Progress. J Cell Biochem 2017; 119:213-222. [PMID: 28513879 DOI: 10.1002/jcb.26136] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/16/2017] [Indexed: 12/29/2022]
Abstract
Breast cancer (BC) is the most commonly diagnosed cancer in women. The PI3K/AKT/mTOR pathway is among the most frequently dysregulated pathways in patients with BC. The activation of this pathway is associated with increased cell growth and clinical outcome, and its overexpression is associated with a poor prognosis. It has been proposed that it may be of importance as a potential therapeutic target in the treatment of BC. The aim of current review is to provide an overview of the potential utility of PI3K/Akt/mTOR inhibitors in patients with BC, with particular emphasis on recent preclinical and clinical studies. J. Cell. Biochem. 119: 213-222, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Afsane Bahrami
- Department of Modern Sciences and Technologies, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Majid Khazaei
- Department of Physiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Seyed Mahdi Hassanian
- Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.,Department of Medical Biochemistry, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Malihe Hasanzadeh
- Department of Gynecology Oncology, Woman Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mina Maftouh
- Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Gordon A Ferns
- Division of Medical Education, Brighton and Sussex Medical School, Falmer, Brighton, Sussex BN1 9PH, UK
| | - Amir Avan
- Metabolic Syndrome Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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16
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Liang N, Li Y, Chung HY. Two natural eudesmane-type sesquiterpenes from Laggera alata inhibit angiogenesis and suppress breast cancer cell migration through VEGF- and Angiopoietin 2-mediated signaling pathways. Int J Oncol 2017; 51:213-222. [PMID: 28534941 DOI: 10.3892/ijo.2017.4004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 02/28/2017] [Indexed: 11/06/2022] Open
Abstract
Eudesmane-type sesquiterpenes are natural sesquiterpenes with anti-inflammatory properties, but their anti-angiogenic activities are not known. The present study demonstrated that 5α-hydroxycostic acid and hydroxyisocostic acid, two eudesmane-type sesquiterpenes (ETSs), isolated from the herb Laggera alata, possessed anti-angiogenic effects. Under non-toxic dosage, ETSs suppressed VEGF‑induced proliferation in human umbilical vein endothelial cells (HUVECs) and vessel formation in zebrafish embryos. Moreover, ETSs inhibited VEGF-stimulated HUVEC migration, stress fibers and tube formation. Results from real‑time PCR analysis involving in vivo and in vitro experiments indicated that pro-angiogenic-related mRNA levels were downregulated, including VEGFA, VEGFR2 and Tie2 genes after ETS treatments. Western blot analysis showed that ETSs suppressed VEGF-stimulated VEGFR2 phosphorylation and activation of its downstream molecules, such as Src/AKT/eNOS, FAK, PLCγ/ERK1/2 and p38. Moreover, the VEGF-stimulation of angiopoietin 2 (Ang2) mRNA level increase was significantly downregulated in the presence of ETSs. ETSs inhibited Ang2-induced phosphorylation of the receptor Tie2 in HUVECs, which indicated that ETSs not just suppressed VEGF/VEGFR2 axis, but also the Ang2/Tie2 one. Furthermore, the wound-healing assay revealed that ETSs reduced the migration of Ang2-stimulated human breast cancer (MCF-7) cells. Mechanistically, the anti-migration effect of ETSs correlated with the blockade of Ang2-induced E-cadherin loss and AKT activation. Collectively, the present study suggests that ETSs possess anti-angiogenic ability by interfering the VEGF- and Ang2-related pathways, and they may be good drug candidates.
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Affiliation(s)
- Ning Liang
- Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Sha Tin, New Territories, Hong Kong, SAR, P.R. China
| | - Yaolan Li
- Institute of Traditional Chinese Medicine and Natural Products, Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Jinan University, Guangzhou, Guangdong, P.R. China
| | - Hau Yin Chung
- Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Sha Tin, New Territories, Hong Kong, SAR, P.R. China
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17
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Lui AJ, Geanes ES, Ogony J, Behbod F, Marquess J, Valdez K, Jewell W, Tawfik O, Lewis-Wambi J. IFITM1 suppression blocks proliferation and invasion of aromatase inhibitor-resistant breast cancer in vivo by JAK/STAT-mediated induction of p21. Cancer Lett 2017; 399:29-43. [PMID: 28411130 DOI: 10.1016/j.canlet.2017.04.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/23/2017] [Accepted: 04/04/2017] [Indexed: 12/19/2022]
Abstract
Interferon induced transmembrane protein 1 (IFITM1) belongs to a family of interferon stimulated genes (ISGs) that is associated with tumor progression and DNA damage resistance; however, its role in endocrine resistance is not known. Here, we correlate IFITM1 expression with clinical stage and poor response to endocrine therapy in a tissue microarray consisting of 94 estrogen receptor (ER)-positive breast tumors. IFITM1 overexpression is confirmed in the AI-resistant MCF-7:5C cell line and not found in AI-sensitive MCF-7 cells. In this study, the orthotopic (mammary fat pad) and mouse mammary intraductal (MIND) models of breast cancer are used to assess tumor growth and invasion in vivo. Lentivirus-mediated shRNA knockdown of IFITM1 in AI-resistant MCF-7:5C cells diminished tumor growth and invasion and induced cell death, whereas overexpression of IFITM1 in wild-type MCF-7 cells promoted estrogen-independent growth and enhanced their aggressive phenotype. Mechanistic studies indicated that loss of IFITM1 in MCF-7:5C cells markedly increased p21 transcription, expression and nuclear localization which was mediated by JAK/STAT activation. These findings suggest IFITM1 overexpression contributes to breast cancer progression and that targeting IFITM1 may be therapeutically beneficial to patients with endocrine-resistant disease.
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Affiliation(s)
- Asona J Lui
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - Eric S Geanes
- Department of Cancer Biology, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - Joshua Ogony
- Department of Cancer Biology, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - Fariba Behbod
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - Jordan Marquess
- University of Kansas Medical Center School of Medicine, USA.
| | - Kelli Valdez
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - William Jewell
- The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
| | - Ossama Tawfik
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, USA.
| | - Joan Lewis-Wambi
- Department of Cancer Biology, University of Kansas Medical Center, USA; The University of Kansas Cancer Center, Kansas City, KS 66160, USA.
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18
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Glück S. Consequences of the Convergence of Multiple Alternate Pathways on the Estrogen Receptor in the Treatment of Metastatic Breast Cancer. Clin Breast Cancer 2017; 17:79-90. [DOI: 10.1016/j.clbc.2016.08.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/01/2016] [Accepted: 08/14/2016] [Indexed: 02/07/2023]
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19
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Alalem M, Ray A, Ray BK. Metformin induces degradation of mTOR protein in breast cancer cells. Cancer Med 2016; 5:3194-3204. [PMID: 27748082 PMCID: PMC5119975 DOI: 10.1002/cam4.896] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 06/22/2016] [Accepted: 07/21/2016] [Indexed: 12/30/2022] Open
Abstract
Activation of mTOR is implicated in the development and progression of breast cancer. mTOR inhibition exhibited promising antitumor effects in breast cancer; however, its effect is compromised by several feedback mechanisms. One of such mechanisms is the upregulation of mTOR pathway in breast cancer cells. Despite the established role of mTOR activation in breast cancer, the status of total mTOR protein and its impact on the tumor behavior and response to treatment are poorly understood. Besides, the mechanisms underlying mTOR protein degradation in normal and cancer breast cells are still largely unknown. We and others found that total mTOR protein level is elevated in breast cancer cells compared to their nonmalignant counterparts. We have detected defective proteolysis of mTOR protein in breast cancer cells, which could, at least in part, explain the high level of mTOR protein in these cells. We show that metformin treatment in MCF‐7 breast cancer cells induced degradation of mTOR and sequestration of this protein in a perinuclear region. The decrease in mTOR protein level in these cells correlated positively with a concomitant inhibition of proliferation and migration potentials of these cells. These findings provided a novel mechanism for the metformin action in breast cancer treatment. Understanding the proteolytic mechanism responsible for mTOR level in breast cancer may pave the way for improving the efficacy of breast cancer treatment regimens and mitigating drug resistance as well as providing a basis for potential novel therapeutic modalities for breast cancer.
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Affiliation(s)
- Mohamed Alalem
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri, 65211
| | - Alpana Ray
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri, 65211
| | - Bimal K Ray
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri, 65211
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20
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Mukhtar E, Adhami VM, Siddiqui IA, Verma AK, Mukhtar H. Fisetin Enhances Chemotherapeutic Effect of Cabazitaxel against Human Prostate Cancer Cells. Mol Cancer Ther 2016; 15:2863-2874. [PMID: 27765854 DOI: 10.1158/1535-7163.mct-16-0515] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 09/19/2016] [Accepted: 09/20/2016] [Indexed: 01/09/2023]
Abstract
Although treatment of prostate cancer has improved over the past several years, taxanes, such as cabazitaxel, remain the only form of effective chemotherapy that improves survival in patients with metastatic castration-resistant prostate cancer. However, the effectiveness of this class of drugs has been associated with various side effects and drug resistance. We previously reported that fisetin, a hydroxyflavone, is a microtubule-stabilizing agent and inhibits prostate cancer cell proliferation, migration, and invasion and suggested its use as an adjuvant for treatment of prostate and other cancer types. In this study, we investigated the effect of fisetin in combination with cabazitaxel with the objective to achieve maximum therapeutic benefit, reduce dose and toxicity, and minimize or delay the induction of drug resistance and metastasis. Our data show for the first time that a combination of fisetin (20 μmol/L) enhances cabazitaxel (5 nmol/L) and synergistically reduces 22Rν1, PC-3M-luc-6, and C4-2 cell viability and metastatic properties with minimal adverse effects on normal prostate epithelial cells. In addition, the combination of fisetin with cabazitaxel was associated with inhibition of proliferation and enhancement of apoptosis. Furthermore, combination treatment resulted in the inhibition of tumor growth, invasion, and metastasis when assessed in two in vivo xenograft mouse models. These results provide evidence that fisetin may have therapeutic benefit for patients with advanced prostate cancer through enhancing the efficacy of cabazitaxel under both androgen-dependent and androgen-independent conditions. This study underscores the benefit of the combination of fisetin with cabazitaxel for the treatment of advanced and resistant prostate cancer and possibly other cancer types. Mol Cancer Ther; 15(12); 2863-74. ©2016 AACR.
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Affiliation(s)
- Eiman Mukhtar
- Department of Dermatology, University of Wisconsin-Madison, Madison Wisconsin
| | | | | | - Ajit Kumar Verma
- Department of Human Oncology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Hasan Mukhtar
- Department of Dermatology, University of Wisconsin-Madison, Madison Wisconsin.
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21
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Lui A, New J, Ogony J, Thomas S, Lewis-Wambi J. Everolimus downregulates estrogen receptor and induces autophagy in aromatase inhibitor-resistant breast cancer cells. BMC Cancer 2016; 16:487. [PMID: 27421652 PMCID: PMC4947349 DOI: 10.1186/s12885-016-2490-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 06/30/2016] [Indexed: 01/12/2023] Open
Abstract
Background mTOR inhibition of aromatase inhibitor (AI)-resistant breast cancer is currently under evaluation in the clinic. Everolimus/RAD001 (Afinitor®) has had limited efficacy as a solo agent but is projected to become part of combination therapy for AI-resistant breast cancer. This study was conducted to investigate the anti-proliferative and resistance mechanisms of everolimus in AI-resistant breast cancer cells. Methods In this study we utilized two AI-resistant breast cancer cell lines, MCF-7:5C and MCF-7:2A, which were clonally derived from estrogen receptor positive (ER+) MCF-7 breast cancer cells following long-term estrogen deprivation. Cell viability assay, colony formation assay, cell cycle analysis and soft agar anchorage-independent growth assay were used to determine the efficacy of everolimus in inhibiting the proliferation and tumor forming potential of MCF-7, MCF-7:5C, MCF-7:2A and MCF10A cells. Confocal microscopy and transmission electron microscopy were used to evaluate LC3-II production and autophagosome formation, while ERE-luciferase reporter, Western blot, and RT-PCR analyses were used to assess ER expression and transcriptional activity. Results Everolimus inhibited the proliferation of MCF-7:5C and MCF-7:2A cells with relatively equal efficiency to parental MCF-7 breast cancer cells. The inhibitory effect of everolimus was due to G1 arrest as a result of downregulation of cyclin D1 and p21. Everolimus also dramatically reduced estrogen receptor (ER) expression (mRNA and protein) and transcriptional activity in addition to the ER chaperone, heat shock protein 90 protein (HSP90). Everolimus restored 4-hydroxy-tamoxifen (4OHT) sensitivity in MCF-7:5C cells and enhanced 4OHT sensitivity in MCF-7 and MCF-7:2A cells. Notably, we found that autophagy is one method of everolimus insensitivity in MCF-7 breast cancer cell lines. Conclusion This study provides additional insight into the mechanism(s) of action of everolimus that can be used to enhance the utility of mTOR inhibitors as part of combination therapy for AI-resistant breast cancer. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2490-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Asona Lui
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,The University of Kansas Cancer Center, Kansas City, KS, 66160, USA
| | - Jacob New
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,The University of Kansas Cancer Center, Kansas City, KS, 66160, USA
| | - Joshua Ogony
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,The University of Kansas Cancer Center, Kansas City, KS, 66160, USA
| | - Sufi Thomas
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,Department of Otolaryngology, University of Kansas Medical Center, Kansas City, KS, 66160, USA.,The University of Kansas Cancer Center, Kansas City, KS, 66160, USA
| | - Joan Lewis-Wambi
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS, 66160, USA. .,The University of Kansas Cancer Center, Kansas City, KS, 66160, USA.
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22
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Zhang LD, Liu Z, Liu H, Ran DM, Guo JH, Jiang B, Wu YL, Gao FH. Oridonin enhances the anticancer activity of NVP-BEZ235 against neuroblastoma cells in vitro and in vivo through autophagy. Int J Oncol 2016; 49:657-65. [PMID: 27278249 DOI: 10.3892/ijo.2016.3557] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 04/09/2016] [Indexed: 11/06/2022] Open
Abstract
The aberrant activation of PI3K/Akt/mTOR signaling pathway plays an important role in the oncogenesis, prognosis and chemotherapy resistance of neuroblastoma. However, NVP-BEZ235, a potent dual PI3K and mTOR inhibitor have not shown beneficial effects on neuroblastoma especially in terms of apoptosis induction as a single agent. We therefore attempted to explore an effective combination regimen to enhance the anticancer activity of NVP-BEZ235. Interestingly, we found that oridonin, a natural biologically active compound extracted from the Chinese medicinal herb Rabdosia rubescens, combined with NVP-BEZ235 markedly induced apoptosis of neuroblastoma cells. Notably, the synergistic activation of the apoptotic pathway was accompanied with enhanced autophagy as evidenced by significant decreased p62 expression as well as upregulated conversion of LC3-II. Suppression of the Beclin-1, a core component of the autophagy machinery, by means of shRNA resulted in diminished synergistic antitumor effect. Furthermore, the co-treatment with oridonin and NVP-BEZ235 was also much more effective than either agent alone in inhibiting the growth of neuroblastoma xenografts and in inducing tumor cells apoptosis. Taken together, our results suggest that the combination of NVP-BEZ235 and oridonin is a novel and potential strategy for neuroblastoma therapy.
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Affiliation(s)
- Li-Di Zhang
- Institute of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Zhen Liu
- Institute of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Hua Liu
- Department of Gastroenterology, The Tenth Hospital Affiliated to Tongji University, Shanghai 200072, P.R. China
| | - Dong-Mei Ran
- Department of Pathology, The Sixth People's Hospital of Zhengzhou City, Zhengzhou, Henan 450015, P.R. China
| | - Jia-Hui Guo
- Institute of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Bin Jiang
- Institute of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
| | - Ying-Li Wu
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital/Faculty of Basic Medicine, Chemical Biology Division of Shanghai Universities E-Institutes, Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, P.R. China
| | - Feng-Hou Gao
- Institute of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P.R. China
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23
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Liu J, Chen X, Ward T, Pegram M, Shen K. Combined niclosamide with cisplatin inhibits epithelial-mesenchymal transition and tumor growth in cisplatin-resistant triple-negative breast cancer. Tumour Biol 2016; 37:9825-35. [PMID: 26810188 DOI: 10.1007/s13277-015-4650-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 12/14/2015] [Indexed: 12/21/2022] Open
Abstract
Women with triple-negative breast cancer have worse prognosis compared to other breast cancer subtypes. Acquired drug resistance remains to be an important reason influencing triple-negative breast cancer treatment efficacy. A prevailing theory postulates that the cancer resistance and recurrence results from a subpopulation of tumor cells with stemness program, which are often insensitive to cytotoxic drugs such as cisplatin. Recent studies suggested that niclosamide, an anti-helminthic drug, has potential therapeutic activities against breast cancer stem cells, which prompts us to determine its roles on eliminating cisplatin-resistant cancer cells. Hence, we established a stable cisplatin-resistant MDA-MB-231 cell line (231-CR) through continuously exposure to increasing concentrations of cisplatin (5-20 μmol/l). Interestingly, 231-CR exhibited properties associated to epithelial-mesenchymal transition with enhanced invasion, preserved proliferation, increased mammosphere formation, and reduced apoptosis compared to naive MDA-MB-231 sensitive cells (231-CS). Importantly, niclosamide or combination with cisplatin inhibited both 231-CS and 231-CR cell proliferation in vitro. In addition, niclosamide reversed the EMT phenotype of 231-CR by downregulation of snail and vimentin. Mechanistically, niclosamide treatment in combination with or without cisplatin significantly inhibited Akt, ERK, and Src signaling pathways. In vivo study showed that niclosamide or combination with cisplatin could repress the growth of xenografts originated from either 231-CS or 231-CR cells, with prominent suppression of Ki67 expression. These findings suggested that niclosamide might serve as a novel therapeutic strategy, either alone or in combination with cisplatin, for triple-negative breast cancer treatment, especially those resistant to cisplatin.
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Affiliation(s)
- Junjun Liu
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China
| | - Xiaosong Chen
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China
| | - Toby Ward
- Stanford Cancer Institute, Stanford University School of Medicine, 265 Campus Drive West, Suite G2021, Stanford, CA, USA
| | - Mark Pegram
- Stanford Cancer Institute, Stanford University School of Medicine, 265 Campus Drive West, Suite G2021, Stanford, CA, USA.
| | - Kunwei Shen
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China.
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24
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Effects of PI3K inhibitor NVP-BKM120 on overcoming drug resistance and eliminating cancer stem cells in human breast cancer cells. Cell Death Dis 2015; 6:e2020. [PMID: 26673665 PMCID: PMC4720896 DOI: 10.1038/cddis.2015.363] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 10/30/2015] [Accepted: 11/12/2015] [Indexed: 01/16/2023]
Abstract
The multidrug resistance (MDR) phenotype often accompanies activation of the phosphatidylinositol 3-kinase (PI3K)/AKT pathway, which renders a survival signal to withstand cytotoxic anticancer drugs and enhances cancer stem cell (CSC) characteristics. As a result, PI3K/AKT-blocking approaches have been proposed as antineoplastic strategies, and inhibitors of PI3K/AKT are currently being trailed clinically in breast cancer patients. However, the effects of PI3K inhibitors on MDR breast cancers have not yet been elucidated. In the present study, the tumorigenic properties of three MDR breast cancer cell lines to a selective inhibitor of PI3K, NVP-BKM120 (BKM120), were assessed. We found that BKM120 showed a significant cytotoxic activity on MDR breast cancer cells both in vitro and in vivo. When doxorubicin (DOX) was combined with BKM120, strong synergistic antiproliferative effect was observed. BKM120 activity induced the blockage of PI3K/AKT signaling and NF-κB expression, which in turn led to activate caspase-3/7 and caspase-9 and changed the expression of several apoptosis-related gene expression. Furthermore, BKM120 effectively eliminated CSC subpopulation and reduced sphere formation of these drug-resistant cells. Our findings indicate that BKM120 partially overcomes the MDR phenotype in chemoresistant breast cancer through cell apoptosis induction and CSC abolishing, which appears to be mediated by the inhibition of the PI3K/AKT/NF-κB axis. This offers a strong rationale to explore the therapeutic strategy of using BKM120 alone or in combination for chemotherapy-nonresponsive breast cancer patients.
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25
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Liu J, Chen X, Ward T, Mao Y, Bockhorn J, Liu X, Wang G, Pegram M, Shen K. Niclosamide inhibits epithelial-mesenchymal transition and tumor growth in lapatinib-resistant human epidermal growth factor receptor 2-positive breast cancer. Int J Biochem Cell Biol 2015; 71:12-23. [PMID: 26643609 DOI: 10.1016/j.biocel.2015.11.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 11/13/2015] [Accepted: 11/23/2015] [Indexed: 01/16/2023]
Abstract
Acquired resistance to lapatinib, a human epidermal growth factor receptor 2 kinase inhibitor, remains a clinical problem for women with human epidermal growth factor receptor 2-positive advanced breast cancer, as metastasis is commonly observed in these patients. Niclosamide, an anti-helminthic agent, has recently been shown to exhibit cytotoxicity to tumor cells with stem-like characteristics. This study was designed to identify the mechanisms underlying lapatinib resistance and to determine whether niclosamide inhibits lapatinib resistance by reversing epithelial-mesenchymal transition. Here, two human epidermal growth factor receptor 2-positive breast cancer cell lines, SKBR3 and BT474, were exposed to increasing concentrations of lapatinib to establish lapatinib-resistant cultures. Lapatinib-resistant SKBR3 and BT474 cells exhibited up-regulation of the phenotypic epithelial-mesenchymal transition markers Snail, vimentin and α-smooth muscle actin, accompanied by activation of nuclear factor-кB and Src and a concomitant increase in stem cell marker expression (CD44(high)/CD24(low)), compared to naive lapatinib-sensitive SKBR3 and BT474 cells, respectively. Interestingly, niclosamide reversed epithelial-mesenchymal transition, induced apoptosis and inhibited cell growth by perturbing aberrant signaling pathway activation in lapatinib-resistant human epidermal growth factor receptor 2-positive cells. The ability of niclosamide to alleviate stem-like phenotype development and invasion was confirmed. Collectively, our results demonstrate that lapatinib resistance correlates with epithelial-mesenchymal transition and that niclosamide inhibits lapatinib-resistant cell viability and epithelial-mesenchymal transition. These findings suggest a role of niclosamide or derivatives optimized for more favorable bioavailability not only in reversing lapatinib resistance but also in reducing metastatic potential during the treatment of human epidermal growth factor receptor 2-positive breast cancer.
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Affiliation(s)
- Junjun Liu
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China; Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Xiaosong Chen
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China; Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Toby Ward
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Yan Mao
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China
| | - Jessica Bockhorn
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Xiaofei Liu
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA
| | - Gen Wang
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China
| | - Mark Pegram
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA.
| | - Kunwei Shen
- Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong Univerisity School of Medicine, Shanghai, China.
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26
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Arnedos M, Vicier C, Loi S, Lefebvre C, Michiels S, Bonnefoi H, Andre F. Precision medicine for metastatic breast cancer—limitations and solutions. Nat Rev Clin Oncol 2015. [DOI: 10.1038/nrclinonc.2015.123] [Citation(s) in RCA: 223] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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27
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The comparison between dual inhibition of mTOR with MAPK and PI3K signaling pathways in KRAS mutant NSCLC cell lines. Tumour Biol 2015; 36:9339-45. [PMID: 26108998 DOI: 10.1007/s13277-015-3671-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 06/15/2015] [Indexed: 01/29/2023] Open
Abstract
KRAS mutations are found in 15-25 % of patients with lung adenocarcinoma, and they lead to constitutive activation of KRAS signaling pathway that results in sustained cell proliferation. Currently, there are no direct anti-KRAS therapies available. Therefore, it is rational to target the downstream molecules of KRAS signaling pathway, which are mitogen-activated protein kinase (MAPK) signaling pathway (RAF-MEK-ERK) and PI3K pathway (PI3K-AKT-mTOR). Here, we examined the inhibition of both these pathways alone and in combination and analyzed the anti-proliferative and apoptotic events in KRAS mutant NSCLC cell lines, A549 and Calu-1. Cytotoxicity was determined by MTT assay after the cells were treated with LY294002 (PI3K inhibitor), U0126 (MEK inhibitor), and RAD001 (mTOR inhibitor) for 24 and 48 h. The expression levels of p-ERK, ERK, AKT, p-AKT, p53, cyclinD1, c-myc, p27(kip1), BAX, BIM, and GAPDH were detected by western blot after 6 and 24 h treatment. Although PI3K/mTOR inhibition is more effective in cytotoxicity in A549 and Calu-1 cells, MEK/mTOR inhibition markedly decreases cell proliferation protein marker expressions. Our data show that combined targeting of MEK and PI3K-AKT with mTOR is a better option than single agents alone for KRAS mutant NSCLC, thus opening the possibility of a beneficial treatment strategy in the future.
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28
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Oh T, Ivan ME, Sun MZ, Safaee M, Fakurnejad S, Clark AJ, Sayegh ET, Bloch O, Parsa AT. PI3K pathway inhibitors: potential prospects as adjuncts to vaccine immunotherapy for glioblastoma. Immunotherapy 2015; 6:737-53. [PMID: 25186604 DOI: 10.2217/imt.14.35] [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] [Indexed: 12/12/2022] Open
Abstract
Constitutive activation of the PI3K pathway has been implicated in glioblastoma (GBM) pathogenesis. Pharmacologic inhibition can both inhibit tumor survival and downregulate expression of programmed death ligand-1, a protein highly expressed on glioma cells that strongly contributes to cancer immunosuppression. In that manner, PI3K pathway inhibitors can help optimize GBM vaccine immunotherapy. In this review, we describe and assess the potential integration of various classes of PI3K pathway inhibitors into GBM immunotherapy. While early-generation inhibitors have a wide range of immunosuppressive effects that could negate their antitumor potency, further work should better characterize how contemporary inhibitors affect the immune response. This will help determine if these inhibitors are truly a therapeutic avenue with a strong future in GBM immunotherapy.
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Affiliation(s)
- Taemin Oh
- Department of Neurological Surgery, Feinberg School of Medicine, Northwestern University, Feinberg School of Medicine, 676 N St Clair Street, Suite 2210, Chicago, IL 60611-2911, USA
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29
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Cuddington BP, Mossman KL. Oncolytic bovine herpesvirus type 1 as a broad spectrum cancer therapeutic. Curr Opin Virol 2015; 13:11-6. [PMID: 25846987 DOI: 10.1016/j.coviro.2015.03.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 03/09/2015] [Accepted: 03/16/2015] [Indexed: 11/29/2022]
Abstract
Oncolytic viruses selectively replicate in tumor cells and elicit antitumor effects in vivo by both direct and indirect methods. They are attractive avenues of cancer therapy due to the absence of toxic side effects often seen in current treatment modalities. Bovine herpesvirus type 1 (BHV-1) holds promise as a broad-spectrum oncolytic vector that is able to infect and kill human tumor cells from a variety of histological origins, including cancer-initiating cells. In the majority of cases, BHV-1 elicits tumor cell death in the absence of a productive infection. In vivo, BHV-1 affects the incidence of secondary lesions in cotton rats bearing subcutaneous breast adenocarcinomas. These recent studies contribute to the characterization of BHV-1 as an oncolytic virus.
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Affiliation(s)
- Breanne P Cuddington
- Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada
| | - Karen L Mossman
- Department of Pathology and Molecular Medicine, McMaster Immunology Research Centre, Institute for Infectious Disease Research, McMaster University, Hamilton, Ontario, Canada.
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30
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Hojjat-Farsangi M. Novel and emerging targeted-based cancer therapy agents and methods. Tumour Biol 2015; 36:543-56. [PMID: 25663495 DOI: 10.1007/s13277-015-3184-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 01/27/2015] [Indexed: 02/06/2023] Open
Abstract
After several decades of uncovering the cancer features and following the improvement of therapeutic agents, however cancer remains as one of the major reasons of mortality. Chemotherapy is one of the main treatment options and has significantly improved the overall survival of cancer patients, but chemotherapeutic agents are highly toxic for normal cells. Therefore, there is a great unmet medical need to develop new therapeutic principles and agents. Targeted-based cancer therapy (TBCT) agents and methods have revolutionized the cancer treatment efficacy. Monoclonal antibodies (mAbs) and small molecule inhibitors (SMIs) are among the most effective agents of TBCT. These drugs have improved the prognosis and survival of cancer patients; however, the therapeutic resistance has subdued the effects. Several mechanisms lead to drug resistance such as mutations in the drug targets, activation of compensatory pathways, and intrinsic or acquired resistance of cancer stem cells. Therefore, new modalities, improving current generation of inhibitors and mAbs, and optimizing the combinational therapy regimens are necessary to decrease the current obstacles in front of TBCT. Moreover, the success of new TBCT agents such as mAbs, SMIs, and immunomodulatory agents has sparked further therapeutic modalities with novel targets to inhibit. Due to the lack of cumulative information describing different agents and methods of TBCT, this review focuses on the most important agents and methods of TBCT that are currently under investigation.
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Affiliation(s)
- Mohammad Hojjat-Farsangi
- Department of Oncology-Pathology, Immune and Gene therapy Lab, Cancer Center Karolinska (CCK), Karolinska University Hospital Solna and Karolinska Institute, SE-171 76, Stockholm, Sweden,
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Mao Y, Zhang Y, Qu Q, Zhao M, Lou Y, Liu J, huang O, Chen X, Wu J, Shen K. Cancer-associated fibroblasts induce trastuzumab resistance in HER2 positive breast cancer cells. MOLECULAR BIOSYSTEMS 2015; 11:1029-40. [PMID: 25648538 DOI: 10.1039/c4mb00710g] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
CAFs isolated from HER2+ patients secreted higher levels of IL6 which expanded cancer stem cells and activated multiple pathways, then induced trastuzumab resistance in HER2 positive breast cancer cells.
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Martin EC, Rhodes LV, Elliott S, Krebs AE, Nephew KP, Flemington EK, Collins-Burow BM, Burow ME. microRNA regulation of mammalian target of rapamycin expression and activity controls estrogen receptor function and RAD001 sensitivity. Mol Cancer 2014; 13:229. [PMID: 25283550 PMCID: PMC4203920 DOI: 10.1186/1476-4598-13-229] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 09/24/2014] [Indexed: 01/28/2023] Open
Abstract
Background The AKT/mammalian target of rapamycin (mTOR) signaling pathway is regulated by 17α-estradiol (E2) signaling and mediates E2-induced proliferation and progesterone receptor (PgR) expression in breast cancer. Methods and results Here we use deep sequencing analysis of previously published data from The Cancer Genome Atlas to demonstrate that expression of a key component of mTOR signaling, rapamycin-insensitive companion of mTOR (Rictor), positively correlated with an estrogen receptor-α positive (ERα+) breast tumor signature. Through increased microRNA-155 (miR-155) expression in the ERα+ breast cancer cells we demonstrate repression of Rictor enhanced activation of mTOR complex 1 (mTORC1) signaling with both qPCR and western blot. miR-155-mediated mTOR signaling resulted in deregulated ERα signaling both in cultured cells in vitro and in xenografts in vivo in addition to repressed PgR expression and activity. Furthermore we observed that miR-155 enhanced mTORC1 signaling (observed through western blot for increased phosphorylation on mTOR S2448) and induced inhibition of mTORC2 signaling (evident through repressed Rictor and tuberous sclerosis 1 (TSC1) gene expression). mTORC1 induced deregulation of E2 signaling was confirmed using qPCR and the mTORC1-specific inhibitor RAD001. Co-treatment of MCF7 breast cancer cells stably overexpressing miR-155 with RAD001 and E2 restored E2-induced PgR gene expression. RAD001 treatment of SCID/CB17 mice inhibited E2-induced tumorigenesis of the MCF7 miR-155 overexpressing cell line. Finally we demonstrated a strong positive correlation between Rictor and PgR expression and a negative correlation with Raptor expression in Luminal B breast cancer samples, a breast cancer histological subtype known for having an altered ERα-signaling pathway. Conclusions miRNA mediated alterations in mTOR and ERα signaling establishes a new mechanism for altered estrogen responses independent of growth factor stimulation. Electronic supplementary material The online version of this article (doi:10.1186/1476-4598-13-229) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | | | | | | | - Matthew E Burow
- Department of Medicine-Section of Hematology and Medical Oncology, Tulane University, New Orleans, LA, USA.
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Sharma A, Janocha AJ, Hill BT, Smith MR, Erzurum SC, Almasan A. Targeting mTORC1-mediated metabolic addiction overcomes fludarabine resistance in malignant B cells. Mol Cancer Res 2014; 12:1205-15. [PMID: 25061101 DOI: 10.1158/1541-7786.mcr-14-0124] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED MTOR complex-1(mTORC1) activation occurs frequently in cancers, yet clinical efficacy of rapalogs is limited because of the associated activation of upstream survival pathways. An alternative approach is to inhibit downstream of mTORC1; therefore, acquired resistance to fludarabine (Flu), a purine analogue and antimetabolite chemotherapy, active agent for chronic lymphocytic leukemia (CLL) was investigated. Elevated phospho-p70S6K, also known as RPS6KB1 (ribosomal protein S6 kinase, 70kDa, polypeptide 1) (T389), an mTORC1 activation marker, predicted Flu resistance in a panel of B-cell lines, isogenic Flu-resistant (FluR) derivatives, and primary human CLL cells. Consistent with the anabolic role of mTORC1, FluR cells had higher rates of glycolysis and oxidative phosphorylation than Flu-sensitive (FluS) cells. Rapalogs (everolimus and rapamycin) induced moderate cell death in FluR and primary CLL cells, and everolimus significantly inhibited glycolysis and oxidative phosphorylation in FluR cells. Strikingly, the higher oxidative phosphorylation in FluR cells was not coupled to higher ATP synthesis. Instead, it contributed primarily to an essential, dihydroorotate dehydrogenase catalyzed, step in de novo pyrimidine biosynthesis. mTORC1 promotes pyrimidine biosynthesis by p70S6 kinase-mediated phosphorylation of CAD (carbamoyl-phosphate synthetase 2, aspartate transcarbamylase, and dihydroorotase; Ser1859) and favors S-phase cell-cycle progression. We found increased phospho-CAD (S1859) and higher S-phase population in FluR cells. Pharmacological inhibition of de novo pyrimidine biosynthesis using N-phosphonacetyl-l-aspartate and leflunomide, RNAi-mediated knockdown of p70S6K, and inhibition of mitochondrial respiration were selectively cytotoxic to FluR, but not FluS, cells. These results reveal a novel link between mTORC1-mediated metabolic reprogramming and Flu resistance identifying mitochondrial respiration and de novo pyrimidine biosynthesis as potential therapeutic targets. IMPLICATIONS This study provides the first evidence for mTORC1/p70S6K-dependent regulation of pyrimidine biosynthesis in a relevant disease setting.
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Affiliation(s)
- Arishya Sharma
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio. Department of Biological, Geological and Environmental Sciences, Cleveland State University, Cleveland, Ohio
| | - Allison J Janocha
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
| | - Brian T Hill
- Department of Hematologic Oncology and Blood Disorders, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio
| | - Mitchell R Smith
- Department of Hematologic Oncology and Blood Disorders, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio
| | - Serpil C Erzurum
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
| | - Alexandru Almasan
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio.
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Sun X, Mao Y, Wang J, Zu L, Hao M, Cheng G, Qu Q, Cui D, Keller ET, Chen X, Shen K, Wang J. IL-6 secreted by cancer-associated fibroblasts induces tamoxifen resistance in luminal breast cancer. Oncogene 2014:onc2014158. [PMID: 24909173 DOI: 10.1038/onc.2014.158] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/22/2014] [Accepted: 04/24/2014] [Indexed: 11/09/2022]
Abstract
Cancer-associated fibroblasts (CAFs) have been implicated in the development of resistance to anticancer drugs; however, the role and mechanism underlying CAFs in luminal breast cancer (BrCA) tamoxifen resistance are unclear. We found that stromal fibroblasts isolated from the central or peripheral area of BrCA have similar CAF phenotype and activity. In vitro and in vivo experiments showed that CAFs derived from clinical-luminal BrCAs induce tamoxifen resistance through decreasing estrogen receptor-α (ER-α) level when cultured with luminal BrCA cell lines MCF7 and T47D. CAFs promoted tamoxifen resistance through interleukin-6 (IL-6) secretion, which activates Janus kinase/signal transducers and activators of transcription (JAK/STAT3) and phosphatidylinositol 3-kinase (PI3K)/AKT pathways in tumor cells, followed by induction of epithelial-mesenchymal transition and upregulation of E3 ubiquitin ligase anaphase-promoting complex 10 activity, which targeted ER-α degradation through the ubiquitin-proteasome pathway. Inhibition of proteasome activity, IL-6 activity or either the JAK/STAT3 or PI3K/AKT pathways markedly reduced CAF-induced tamoxifen resistance. In xenograft experiments of CAFs mixed with MCF7 cells, CAF-specific IL-6 knockdown inhibited tumorigenesis and restored tamoxifen sensitivity. These findings indicate that CAFs mediate tamoxifen resistance through IL-6-induced degradation of ER-α in luminal BrCAs.Oncogene advance online publication, 9 June 2014; doi:10.1038/onc.2014.158.
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Affiliation(s)
- X Sun
- Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Y Mao
- Comprehensive Breast Health Center, Shanghai Jiaotong University School of Medicine, Ruijin Hospital, Shanghai, China
| | - J Wang
- Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - L Zu
- Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - M Hao
- Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - G Cheng
- Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Q Qu
- Comprehensive Breast Health Center, Shanghai Jiaotong University School of Medicine, Ruijin Hospital, Shanghai, China
| | - D Cui
- Department of Urology, University of Michigan, Ann Arbor, MI, USA
| | - E T Keller
- Department of Urology, University of Michigan, Ann Arbor, MI, USA
| | - X Chen
- Comprehensive Breast Health Center, Shanghai Jiaotong University School of Medicine, Ruijin Hospital, Shanghai, China
| | - K Shen
- Comprehensive Breast Health Center, Shanghai Jiaotong University School of Medicine, Ruijin Hospital, Shanghai, China
| | - J Wang
- 1] Department of Biochemistry and Molecular and Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiaotong University School of Medicine, Shanghai, China [2] Comprehensive Breast Health Center, Renji Hospital, Shanghai, China
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35
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Ingels A, Zhao H, Thong AE, Saar M, Valta MP, Nolley R, Santos J, Peehl DM. Preclinical trial of a new dual mTOR inhibitor, MLN0128, using renal cell carcinoma tumorgrafts. Int J Cancer 2013; 134:2322-9. [PMID: 24243565 DOI: 10.1002/ijc.28579] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 10/06/2013] [Accepted: 10/22/2013] [Indexed: 01/01/2023]
Abstract
mTOR is a rational target in renal cell carcinoma (RCC) because of its role in disease progression. However, the effects of temsirolimus, the only first-generation mTOR inhibitor approved by the FDA for first-line treatment of metastatic RCC, on tumor reduction and progression-free survival are minimal. Second-generation mTOR inhibitors have not been evaluated on RCC. We compared the effects of temsirolimus and MLN0128, a potent second-generation mTOR inhibitor, on RCC growth and metastasis using a realistic patient-derived tissue slice graft (TSG) model. TSGs were derived from three fresh primary RCC specimens by subrenal implantation of precision-cut tissue slices into immunodeficient mice that were randomized and treated with MLN0128, temsirolimus, or placebo. MLN0128 consistently suppressed primary RCC growth, monitored by magnetic resonance imaging (MRI), in three TSG cohorts for up to 2 months. Temsirolimus, in contrast, only transiently inhibited the growth of TSGs in one of two cohorts before resistance developed. In addition, MLN0128 reduced liver metastases, determined by human-specific quantitative polymerase chain reaction, in two TSG cohorts, whereas temsirolimus failed to have any significant impact. Moreover, MLN0128 decreased levels of key components of the two mTOR subpathways including TORC1 targets 4EBP1, p-S6K1, HIF1α and MTA1 and the TORC2 target c-Myc, consistent with dual inhibition. Our results demonstrated that MLN0128 is superior to temsirolimus in inhibiting primary RCC growth as well as metastases, lending strong support for further clinical development of dual mTOR inhibitors for RCC treatment.
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Affiliation(s)
- Alexandre Ingels
- Department of Urology, Stanford University School of Medicine, Stanford, CA; Department of Urology, Centre Hospitalier Universitaire du Kremlin-Bicêtre, Kremlin-Bicêtre, France
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36
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Johnston PG, Zucker I. Lability and diversity of circadian rhythms of cotton rats Sigmodon hispidus. Sci Rep 1983; 9:236. [PMID: 30659204 PMCID: PMC6338744 DOI: 10.1038/s41598-018-35619-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 11/02/2018] [Indexed: 02/06/2023] Open
Abstract
Tumor initiating cells (TIC) have been suggested as a mechanism for driving chemoresistance and tumor recurrence in human cancers including triple negative breast cancer (TNBC). Significant progress has been made in targeting TICs. However, methods for simultaneously targeting heterogeneous TIC populations are lacking. In this study, we found that treating TNBC cells with chemotherapeutic agents led to a significant accumulation of the ALDH+ TIC population. Treating TNBC cells with a disulfiram and copper mixture (DSF/Cu) specifically decreased the ALDH+ TIC population and treatment with BKM120, a pan-PI3K inhibitor, significantly decreased the CD44+/CD24− TIC population. Furthermore, treatment with DSF/Cu or BKM120 induced higher levels of apoptosis in ALDH+ or CD44+/CD24− populations, respectively, than in bulk tumor cells. Combining DSF/Cu and BKM120 treatment simultaneously decreased the ALDH+ and CD44+/CD24− TICs. Using a TNBC tumor xenograft mouse model, we found that DSF/BKM in combination with Taxol significantly reduced the tumor burden and delayed tumor recurrence compared to Taxol treatment alone. Our study is the first of its kind to use two different drugs to abolish two major TIC subtypes simultaneously and inhibit tumor recurrence. These results lay a foundation for developing a novel therapy that can improve chemotherapeutic efficacy.
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