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Fernández-Rodríguez J, Creus-Bachiller E, Zhang X, Martínez-Iniesta M, Ortega-Bertran S, Guha R, Thomas CJ, Wallace MR, Romagosa C, Salazar-Huayna L, Reilly KM, Blakely JO, Serra-Musach J, Pujana MA, Serra E, Villanueva A, Ferrer M, Lázaro C. A High-Throughput Screening Platform Identifies Novel Combination Treatments for Malignant Peripheral Nerve Sheath Tumors. Mol Cancer Ther 2022; 21:1246-1258. [PMID: 35511749 PMCID: PMC9256801 DOI: 10.1158/1535-7163.mct-21-0947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 03/09/2022] [Accepted: 04/28/2022] [Indexed: 01/07/2023]
Abstract
Malignant peripheral nerve sheath tumors (MPNST) are soft-tissue sarcomas that are the leading cause of mortality in patients with Neurofibromatosis type 1 (NF1). Single chemotherapeutic agents have shown response rates ranging from 18% to 44% in clinical trials, so there is still a high medical need to identify chemotherapeutic combination treatments that improve clinical prognosis and outcome. We screened a collection of compounds from the NCATS Mechanism Interrogation PlatE (MIPE) library in three MPNST cell lines, using cell viability and apoptosis assays. We then tested whether compounds that were active as single agents were synergistic when screened as pairwise combinations. Synergistic combinations in vitro were further evaluated in patient-derived orthotopic xenograft/orthoxenograft (PDOX) athymic models engrafted with primary MPNST matching with their paired primary-derived cell line where synergism was observed. The high-throughput screening identified 21 synergistic combinations, from which four exhibited potent synergies in a broad panel of MPNST cell lines. One of the combinations, MK-1775 with Doxorubicin, significantly reduced tumor growth in a sporadic PDOX model (MPNST-SP-01; sevenfold) and in an NF1-PDOX model (MPNST-NF1-09; fourfold) and presented greater effects in TP53 mutated MPNST cell lines. The other three combinations, all involving Panobinostat (combined with NVP-BGT226, Torin 2, or Carfilzomib), did not reduce the tumor volume in vivo at noncytotoxic doses. Our results support the utility of our screening platform of in vitro and in vivo models to explore new therapeutic approaches for MPNSTs and identified that combination MK-1775 with Doxorubicin could be a good pharmacologic option for the treatment of these tumors.
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Affiliation(s)
- Juana Fernández-Rodríguez
- Hereditary Cancer Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain,Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain
| | - Edgar Creus-Bachiller
- Hereditary Cancer Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain,Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain
| | - Xiaohu Zhang
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, Rockville, MD, USA
| | - Maria Martínez-Iniesta
- Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Procure Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain
| | - Sara Ortega-Bertran
- Hereditary Cancer Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain,Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain
| | - Rajarshi Guha
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, Rockville, MD, USA
| | - Craig J. Thomas
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, Rockville, MD, USA
| | - Margaret R. Wallace
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, FL, USA
| | - Cleofe Romagosa
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain.,Department of Pathology, Vall d’Hebron University Hospital, Barcelona, Spain
| | | | - Karlyne M. Reilly
- Pediatric Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD, USA
| | - Jaishri O. Blakely
- Neurofibromatosis Therapeutic Acceleration Program (NTAP), Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jordi Serra-Musach
- Procure Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain
| | - Miguel Angel Pujana
- Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Procure Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain
| | - Eduard Serra
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain.,Hereditary Cancer Group. The Institute for Health Science Research Germans Trias i Pujol (IGTP) - PMPPC; Badalona, Barcelona, Spain
| | - Alberto Villanueva
- Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Procure Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain
| | - Marc Ferrer
- Division of Preclinical Innovation, National Center for Advancing Translational Sciences, NIH, Rockville, MD, USA.,Correspondence:Conxi Lázaro, Ph.D. Hereditary Cancer Program, Catalan Institute of Oncology, IDIBELL and CIBERONC. Av. Gran Via 199-203, 08908, Hospitalet de Llobregat, Spain, Tel: (+34) 93 2607145, , Marc Ferrer, Ph.D. National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Drive, Rockville, MD 20850, Tel: (240) 515-4118,
| | - Conxi Lázaro
- Hereditary Cancer Program, Catalan Institute of Oncology, Hospitalet de Llobregat, Barcelona, Spain,Program in Molecular Mechanisms and Experimental Therapy in Oncology (Oncobell), IDIBELL, Hospitalet de Llobregat, Barcelona, Spain.,Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Spain.,Correspondence:Conxi Lázaro, Ph.D. Hereditary Cancer Program, Catalan Institute of Oncology, IDIBELL and CIBERONC. Av. Gran Via 199-203, 08908, Hospitalet de Llobregat, Spain, Tel: (+34) 93 2607145, , Marc Ferrer, Ph.D. National Center for Advancing Translational Sciences, NIH, 9800 Medical Center Drive, Rockville, MD 20850, Tel: (240) 515-4118,
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2
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Bhagya N, Chandrashekar KR. Autophagy and cancer: Can tetrandrine be a potent anticancer drug in the near future? Biomed Pharmacother 2022; 148:112727. [PMID: 35219119 DOI: 10.1016/j.biopha.2022.112727] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 02/14/2022] [Accepted: 02/15/2022] [Indexed: 11/02/2022] Open
Abstract
Autophagy is an essential catabolic process in mammalian cells to maintain cellular integrity and viability by degrading the old and damaged cell organelles and other contents with the help of lysosomes. Deregulation in autophagy can be one of the major contributors leading to the continuous cell proliferation and development of tumors. Tetrandrine, a bisbenzylisoquinoline alkaloid known to have potent bioactivities such as anticancer, antimicrobial, anti-inflammatory, antidiabetic, antioxidant, immunosuppressive, cardiovascular, and calcium channel blocking effects. The present review evaluated the effectiveness of tetrandrine in targeting key proteins in the autophagy pathway to induce anticancer effect based on the available literature. An attempt is also made to understand the influence of tetrandrine in regulating autophagy by mTOR dependant and mTOR-independent pathways. In addition, the review also highlights the limitations involved and future perspectives in developing tetrandrine as a chemotherapeutic drug to treat cancer.
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Affiliation(s)
- N Bhagya
- Yenepoya Research Center, Yenepoya (Deemed to be University), Deralakatte, Mangalore, Karnataka 575018, India
| | - K R Chandrashekar
- Yenepoya (Deemed to be University), Deralakatte, Mangalore, Karnataka 575018, India.
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3
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Mo J, Moye SL, McKay RM, Le LQ. Neurofibromin and suppression of tumorigenesis: beyond the GAP. Oncogene 2022; 41:1235-1251. [PMID: 35066574 PMCID: PMC9063229 DOI: 10.1038/s41388-021-02156-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/01/2021] [Accepted: 12/13/2021] [Indexed: 12/15/2022]
Abstract
Neurofibromatosis type 1 (NF1) is an autosomal dominant genetic disease and one of the most common inherited tumor predisposition syndromes, affecting 1 in 3000 individuals worldwide. The NF1 gene encodes neurofibromin, a large protein with RAS GTP-ase activating (RAS-GAP) activity, and loss of NF1 results in increased RAS signaling. Neurofibromin contains many other domains, and there is considerable evidence that these domains play a role in some manifestations of NF1. Investigating the role of these domains as well as the various signaling pathways that neurofibromin regulates and interacts with will provide a better understanding of how neurofibromin acts to suppress tumor development and potentially open new therapeutic avenues. In this review, we discuss what is known about the structure of neurofibromin, its interactions with other proteins and signaling pathways, its role in development and differentiation, and its function as a tumor suppressor. Finally, we discuss the latest research on potential therapeutics for neurofibromin-deficient neoplasms.
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Affiliation(s)
- Juan Mo
- Department of Dermatology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA
| | - Stefanie L. Moye
- Department of Dermatology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA
| | - Renee M. McKay
- Department of Dermatology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA
| | - Lu Q. Le
- Department of Dermatology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA,Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA,UTSW Comprehensive Neurofibromatosis Clinic, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA,Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA,O’Donnell Brain Institute, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390-9069, USA,Correspondence and requests for materials should be addressed to Lu Q. Le.
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4
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Raufi AG, Liguori NR, Carlsen L, Parker C, Hernandez Borrero L, Zhang S, Tian X, Louie A, Zhou L, Seyhan AA, El-Deiry WS. Therapeutic Targeting of Autophagy in Pancreatic Ductal Adenocarcinoma. Front Pharmacol 2021; 12:751568. [PMID: 34916936 PMCID: PMC8670090 DOI: 10.3389/fphar.2021.751568] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 10/25/2021] [Indexed: 12/24/2022] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is an aggressive disease characterized by early metastasis, late detection, and poor prognosis. Progress towards effective therapy has been slow despite significant efforts. Novel treatment approaches are desperately needed and autophagy, an evolutionary conserved process through which proteins and organelles are recycled for use as alternative energy sources, may represent one such target. Although incompletely understood, there is growing evidence suggesting that autophagy may play a role in PDAC carcinogenesis, metastasis, and survival. Early clinical trials involving autophagy inhibiting agents, either alone or in combination with chemotherapy, have been disappointing. Recently, evidence has demonstrated synergy between the MAPK pathway and autophagy inhibitors in PDAC, suggesting a promising therapeutic intervention. In addition, novel agents, such as ONC212, have preclinical activity in pancreatic cancer, in part through autophagy inhibition. We discuss autophagy in PDAC tumorigenesis, metabolism, modulation of the immune response, and preclinical and clinical data with selected autophagy modulators as therapeutics.
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Affiliation(s)
- Alexander G. Raufi
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Hematology/Oncology Division, Department of Medicine, Lifespan Health System and Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- *Correspondence: Wafik S. El-Deiry, ; Alexander G. Raufi,
| | - Nicholas R. Liguori
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Temple University, Lewis Katz School of Medicine, Philadelphia, PA, United States
| | - Lindsey Carlsen
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Pathobiology Graduate Program, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Cassandra Parker
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Department of Surgery, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Liz Hernandez Borrero
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Pathobiology Graduate Program, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Shengliang Zhang
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Xiaobing Tian
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Anna Louie
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Department of Surgery, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Lanlan Zhou
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Attila A. Seyhan
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI, United States
| | - Wafik S. El-Deiry
- Laboratory of Translational Oncology and Experimental Cancer Therapeutics, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Hematology/Oncology Division, Department of Medicine, Lifespan Health System and Brown University, Providence, RI, United States
- Joint Program in Cancer Biology, Lifespan Health System and Brown University, Providence, RI, United States
- Cancer Center at Brown University, Providence, RI, United States
- Pathobiology Graduate Program, Warren Alpert Medical School, Brown University, Providence, RI, United States
- Department of Pathology and Laboratory Medicine, Warren Alpert Medical School, Brown University, Providence, RI, United States
- *Correspondence: Wafik S. El-Deiry, ; Alexander G. Raufi,
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5
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Ferdoushi A, Jamaluddin MFB, Li X, Pundavela J, Faulkner S, Hondermarck H. Secretome analysis of human schwann cells derived from malignant peripheral nerve sheath tumor. Proteomics 2021; 22:e2100063. [PMID: 34648240 DOI: 10.1002/pmic.202100063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 08/26/2021] [Accepted: 09/23/2021] [Indexed: 11/06/2022]
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are highly aggressive, nerve-associated tumors and the main cause of death amongst neurofibromatosis type I (NF1) patients. Schwann cells (SCs) are the pathogenic cell type in MPNST, however the secretome of human MPNST -derived SCs is poorly defined. In this study, a comprehensive proteomic analysis of the proteins secreted by the sNF96.2 human SC line, derived from a patient with MPNST, was performed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). A total of 17,354 unique peptides corresponding to 1538 individual proteins were identified. Among them, 995 proteins were confirmed as secreted using various bioinformatics tools including SignalP, SecretomeP, Vertebrate Secretome Database (VerSeDa), and Ingenuity Pathway Analysis (IPA). Gene Ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment were conducted to assign protein localization and function, and to define enriched pathways. Protein binding was the most enriched molecular function, and the most enriched biological process was cell-cell adhesion. Metabolic pathways showed the highest levels of enrichment. In addition, 13 of the identified proteins were validated in Western blotting. This comprehensive secretome map constitutes a reference library providing a new molecular insight into MPNST.
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Affiliation(s)
- Aysha Ferdoushi
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, New South Wales, Australia.,Department of Biotechnology and Genetic Engineering, Mawlana Bhashani Science and Technology University, Tangail, Bangladesh
| | - M Fairuz B Jamaluddin
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, New South Wales, Australia
| | - Xiang Li
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, New South Wales, Australia
| | - Jay Pundavela
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Sam Faulkner
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, New South Wales, Australia
| | - Hubert Hondermarck
- School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, New South Wales, Australia.,Hunter Medical Research Institute, University of Newcastle, New Lambton, New South Wales, Australia
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6
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Kumar P, Jagtap YA, Patwa SM, Kinger S, Dubey AR, Prajapati VK, Dhiman R, Poluri KM, Mishra A. Autophagy based cellular physiological strategies target oncogenic progression. J Cell Physiol 2021; 237:258-277. [PMID: 34448206 DOI: 10.1002/jcp.30567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 07/27/2021] [Accepted: 08/16/2021] [Indexed: 12/22/2022]
Abstract
Evidence accumulated from past findings indicates that defective proteostasis may contribute to risk factors for cancer generation. Irregular assembly of abnormal proteins catalyzes the disturbance of cellular proteostasis and induces the ability of abnormal cellular proliferation. The autophagy mechanism plays a key role in the regular clearance of abnormal/poor lipids, proteins, and various cellular organelles. The results of functional and effective autophagy deliver normal cellular homeostasis, which establishes supportive metabolism and avoids unexpected tumorigenesis events. Still, the precise molecular mechanism of autophagy in tumor suppression has not been clear. How autophagy triggers selective or nonselective bulk degradation to dissipate tumor promotion under stress conditions is not clear. Under proteotoxic insults to knockdown the drive of tumorigenesis, it is critical for us to figure out the detailed molecular functions of autophagy in human cancers. The current article summarizes autophagy-based theragnostic strategies targeting various phases of tumorigenesis and suggests the preventive roles of autophagy against tumor progression. A better understanding of various molecular partners of autophagic flux will improve and innovate therapeutic approaches based on autophagic-susceptible effects against cellular oncogenic transformation.
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Affiliation(s)
- Prashant Kumar
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
| | - Yuvraj Anandrao Jagtap
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
| | - Som Mohanlal Patwa
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
| | - Sumit Kinger
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
| | - Ankur Rakesh Dubey
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
| | - Vijay Kumar Prajapati
- Department of Biochemistry, School of Life Sciences, Central University of Rajasthan, Ajmer, Rajasthan, India
| | - Rohan Dhiman
- Laboratory of Mycobacterial Immunology, Department of Life Science, National Institute of Technology, Rourkela, Odisha, India
| | - Krishna Mohan Poluri
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
| | - Amit Mishra
- Department of Bioscience & Bioengineering, Cellular and Molecular Neurobiology Unit, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan, India
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7
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Martins WK, Silva MDND, Pandey K, Maejima I, Ramalho E, Olivon VC, Diniz SN, Grasso D. Autophagy-targeted therapy to modulate age-related diseases: Success, pitfalls, and new directions. CURRENT RESEARCH IN PHARMACOLOGY AND DRUG DISCOVERY 2021; 2:100033. [PMID: 34909664 PMCID: PMC8663935 DOI: 10.1016/j.crphar.2021.100033] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 04/15/2021] [Accepted: 05/02/2021] [Indexed: 02/08/2023] Open
Abstract
Autophagy is a critical metabolic process that supports homeostasis at a basal level and is dynamically regulated in response to various physiological and pathological processes. Autophagy has some etiologic implications that support certain pathological processes due to alterations in the lysosomal-degradative pathway. Some of the conditions related to autophagy play key roles in highly relevant human diseases, e.g., cardiovascular diseases (15.5%), malignant and other neoplasms (9.4%), and neurodegenerative conditions (3.7%). Despite advances in the discovery of new strategies to treat these age-related diseases, autophagy has emerged as a therapeutic option after preclinical and clinical studies. Here, we discuss the pitfalls and success in regulating autophagy initiation and its lysosome-dependent pathway to restore its homeostatic role and mediate therapeutic effects for cancer, neurodegenerative, and cardiac diseases. The main challenge for the development of autophagy regulators for clinical application is the lack of specificity of the repurposed drugs, due to the low pharmacological uniqueness of their target, including those that target the PI3K/AKT/mTOR and AMPK pathway. Then, future efforts must be conducted to deal with this scenery, including the disclosure of key components in the autophagy machinery that may intervene in its therapeutic regulation. Among all efforts, those focusing on the development of novel allosteric inhibitors against autophagy inducers, as well as those targeting autolysosomal function, and their integration into therapeutic regimens should remain a priority for the field.
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Affiliation(s)
- Waleska Kerllen Martins
- Laboratory of Cell and Membrane (LCM), Anhanguera University of São Paulo (UNIAN), Rua Raimundo Pereira de Magalhães, 3,305. Pirituba, São Paulo, 05145-200, Brazil
| | - Maryana do Nascimento da Silva
- Laboratory of Cell and Membrane (LCM), Anhanguera University of São Paulo (UNIAN), Rua Raimundo Pereira de Magalhães, 3,305. Pirituba, São Paulo, 05145-200, Brazil
| | - Kiran Pandey
- Center for Neural Science, New York University, Meyer Building, Room 823, 4 Washington Place, New York, NY, 10003, USA
| | - Ikuko Maejima
- Laboratory of Molecular Traffic, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa Machi, Maebashi, Gunma, 3718512, Japan
| | - Ercília Ramalho
- Laboratory of Cell and Membrane (LCM), Anhanguera University of São Paulo (UNIAN), Rua Raimundo Pereira de Magalhães, 3,305. Pirituba, São Paulo, 05145-200, Brazil
| | - Vania Claudia Olivon
- Laboratory of Pharmacology and Physiology, UNIDERP, Av. Ceará, 333. Vila Miguel Couto, Campo Grande, MS, 79003-010, Brazil
| | - Susana Nogueira Diniz
- Laboratory of Molecular Biology and Functional Genomics, Anhanguera University of São Paulo (UNIAN), Rua Raimundo Pereira de Magalhães, 3,305. Pirituba, São Paulo, 05145-200, Brazil
| | - Daniel Grasso
- Instituto de Estudios de la Inmunidad Humoral (IDEHU), Universidad de Buenos Aires, CONICET, Junín 954 p4, Buenos Aires, C1113AAD, Argentina
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8
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The PTEN Tumor Suppressor Gene in Soft Tissue Sarcoma. Cancers (Basel) 2019; 11:cancers11081169. [PMID: 31416195 PMCID: PMC6721622 DOI: 10.3390/cancers11081169] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Revised: 07/26/2019] [Accepted: 08/08/2019] [Indexed: 02/07/2023] Open
Abstract
Soft tissue sarcoma (STS) is a rare malignancy of mesenchymal origin classified into more than 50 different subtypes with distinct clinical and pathologic features. Despite the poor prognosis in the majority of patients, only modest improvements in treatment strategies have been achieved, largely due to the rarity and heterogeneity of these tumors. Therefore, the discovery of new prognostic and predictive biomarkers, together with new therapeutic targets, is of enormous interest. Phosphatase and tensin homolog (PTEN) is a well-known tumor suppressor that commonly loses its function via mutation, deletion, transcriptional silencing, or protein instability, and is frequently downregulated in distinct sarcoma subtypes. The loss of PTEN function has consequent alterations in important pathways implicated in cell proliferation, survival, migration, and genomic stability. PTEN can also interact with other tumor suppressors and oncogenic signaling pathways that have important implications for the pathogenesis in certain STSs. The aim of the present review is to summarize the biological significance of PTEN in STS and its potential role in the development of new therapeutic strategies.
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9
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Zhao H, Chen G, Liang H. Dual PI3K/mTOR Inhibitor, XL765, suppresses glioblastoma growth by inducing ER stress-dependent apoptosis. Onco Targets Ther 2019; 12:5415-5424. [PMID: 31360067 PMCID: PMC6625605 DOI: 10.2147/ott.s210128] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/21/2019] [Indexed: 11/26/2022] Open
Abstract
Background: Deregulated phosphoinositide 3-kinase (PI3K)/mTOR signaling commonly exists in glioblastoma (GBM), making this axis an attractive target for therapeutic manipulation. A recent dual inhibitor of PI3K/mTOR pathway, XL765, exhibited an attractive suppression effect on GBM tumor growth. However, the exact functional mechanisms of tumor suppression mediated by XL765 have not yet been fully characterized. Purpose: In this study, we took efforts to assess the effects of PI3K/mTOR blockade by XL765 on GBM growth in vitro and in vivo. Methods: We analyzed the cytotoxicity of XL765 in three different GBM cell lines, A172, U87MG, and T98G, by using Hoechst 33258 (Invitrogen), Annexin V/propidium iodide (PI), as well as Cell Counting Kit -8 (CCK‐8) assay. We also used A172 xenograft model to study the effect of XL765 in vivo. Results: We found that XL765 inhibits GBM viability with a wide range of potencies. Importantly, XL765 suppressed GBM cell growth by inducing endoplasmic reticulum (ER) stress dependent apoptosis. The activation of CHOP/DR5 pathway by XL765 induced ER stress is responsible for the induction of apoptosis. Moreover, the inhibition of mTOR signal by XL765 is the major source of ER stress, rather than inhibition of PI3K. At last, we demonstrated that combination of XL765 with GMB chemotherapeutic drug, temozolomide (TMZ), can achieved better therapy effect in vitro and in vivo. Conclusion: Overall, our data show that targeting PI3K/mTOR by XL765 is a promising therapeutic strategy to relieve tumor burden in GBM patients.
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Affiliation(s)
- Hang Zhao
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin 130033, People's Republic of China
| | - Guangyong Chen
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin 130033, People's Republic of China
| | - Huaxin Liang
- Department of Neurosurgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin 130033, People's Republic of China
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10
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Kim MY, Kruger AJ, Jeong JY, Kim J, Shin PK, Kim SY, Cho JY, Hahm KB, Hong SP. Combination Therapy with a PI3K/mTOR Dual Inhibitor and Chloroquine Enhances Synergistic Apoptotic Cell Death in Epstein-Barr Virus-Infected Gastric Cancer Cells. Mol Cells 2019; 42:448-459. [PMID: 31085812 PMCID: PMC6602147 DOI: 10.14348/molcells.2019.2395] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 03/26/2019] [Accepted: 03/27/2019] [Indexed: 02/06/2023] Open
Abstract
The phosphoinositide 3-kinase/protein kinase B/mammalian target of rapamycin (PI3K/AKT/mTOR) signaling pathway is a promising target for gastric cancer (GC) treatment; however the efficacy of PI3K/mTOR dual inhibitors in GC has not yet been maximized. Additionally, the effect of autophagy regulation by PI3K/mTOR dual inhibitors has not been clearly elucidated in GC treatment. We aimed to show that our newly developed PI3K/mTOR dual inhibitor, CMG002, when combined with an autophagy inhibitor, chloroquine (CQ), potently induces effective cancer cell death in Epstein–Barr virus (EBV)-associated gastric cancer (EBVaGC) cells, where both the PI3K/AKT/mTOR and autophagy pathways play important roles in disease pathogenesis. EBV- and mock-infected AGS and NUGC3 GC cell lines were treated with CMG002 +/− CQ. PI3K/AKT/mTOR signaling pathway mediators, cellular apoptosis and autophagy markers were confirmed by Western blot assay. Cell viability was assessed using the Cell Counting Kit-8 (CCK-8) assay. CMG002 effectively blocked the PI3K/AKT/mTOR pathway by markedly decreasing phosphorylation of AKT and its downstream mediator S6. CMG002 induced G0/G1 cell cycle arrest and enhanced apoptotic cell death in AGS and NUGC3 cells, particularly EBV-infected cells compared with mock-infected cells, as confirmed by flow cytometric analyses and TUNEL (terminal deoxynucleotidyl transferase dUTP nick end labeling) assays. The combination of CMG002 plus CQ synergistically increased apoptotic cell death in EBV-infected GC cell lines when compared with CMG002 alone (P < 0.05). Our results suggest that the new PI3K/mTOR dual inhibitor, CMG002, when used in combination with the autophagy inhibitor, CQ, provides enhanced therapeutic efficacy against EBVaGC.
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Affiliation(s)
- Mi-Young Kim
- Digestive Disease Center, CHA University, Seongnam 13496,
Korea
- Liver Center and Gastrointestinal Division, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114,
USA
| | - Annie J. Kruger
- Liver Center and Gastrointestinal Division, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114,
USA
- Division of Gastroenterology, MedStar Georgetown University Hospital, Washington, DC 20007,
USA
| | - Ju-Yeon Jeong
- Institute for Clinical Research, CHA Bundang Medical Center, CHA University, Seongnam 13496,
Korea
| | - Jaehee Kim
- Institute for Clinical Research, CHA Bundang Medical Center, CHA University, Seongnam 13496,
Korea
| | - Phil kyung Shin
- Institute for Clinical Research, CHA Bundang Medical Center, CHA University, Seongnam 13496,
Korea
| | - Sun Young Kim
- Department of Hematology and Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351,
Korea
| | - Joo Young Cho
- Digestive Disease Center, CHA University, Seongnam 13496,
Korea
| | - Ki Baik Hahm
- Digestive Disease Center, CHA University, Seongnam 13496,
Korea
| | - Sung Pyo Hong
- Digestive Disease Center, CHA University, Seongnam 13496,
Korea
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11
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Anticancer compound XL765 as PI3K/mTOR dual inhibitor: A structural insight into the inhibitory mechanism using computational approaches. PLoS One 2019; 14:e0219180. [PMID: 31247018 PMCID: PMC6597235 DOI: 10.1371/journal.pone.0219180] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 06/18/2019] [Indexed: 12/16/2022] Open
Abstract
The PI3K-AKT-mTOR pathway is often a commonly disrupted pathway in human cancer and, therefore, it is widely exploited for cancer therapy. The inhibitors for the important proteins of the pathway including PI3K and mTOR have been increasingly designed. The dual inhibitors targeting PI3K and mTOR both have proven to be more effective than those targeting single protein only. An orally-active compound XL765 is well established as PI3K/mTOR dual inhibitor and have shown in vitro and in vivo anticancer activity against a variety of cancer types and is undergoing clinical trials. The present study explored the exact binding pose and the the interactive forces holding XL765 within the active sites of PI3Kγ and mTOR using molecular docking analyses. The XL765 interacting residues of both the proteins were delineated and the degree of participation in binding was estimated by various methods. In the process, among the interacting residues of PI3Kγ, the Lys-890 and the Met-953 were recognized as the key residues involved in XL765 binding. While, in mTOR case, the Trp-2239 was recognized as the key residue playing role in the XL765 binding. In order to explore the better inhibitors, the study also generated combinatorial chemical library by modifying the scaffold considered from XL765. The virtual screening of the generated compound library led to identification of six novel promising compounds proposed as PI3K/mTOR dual inhibitors. Thus, the present work will through light on the drug inhibitory mechanism of XL765 for PI3K and mTOR, and will also assist in designing novel efficacious drug candidates.
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12
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Lin X, Peng Z, Wang X, Zou J, Chen D, Chen Z, Li Z, Dong B, Gao J, Shen L. Targeting autophagy potentiates antitumor activity of Met-TKIs against Met-amplified gastric cancer. Cell Death Dis 2019; 10:139. [PMID: 30760701 PMCID: PMC6374362 DOI: 10.1038/s41419-019-1314-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 12/05/2018] [Accepted: 12/20/2018] [Indexed: 12/19/2022]
Abstract
Met tyrosine kinase inhibitors (Met-TKIs) subjected to ongoing clinical trials are a promising option for Met-amplified gastric cancer (GC), but how to optimize their antitumor activity especially with combination schemes remains unclear. Since autophagy is known to be initiated by Met-TKIs, we investigated its underlying mechanisms and therapeutic potentials of Met-TKIs combined with autophagy inhibitors against Met-amplified GC. As expected, four Met-TKIs induced autophagy in Met-amplified GC cells marked by p62 degradation, LC3-II accumulation and increased LC3-positive puncta. Autophagy flux activation by Met-TKIs was further validated with combined lysosomal inhibitors, bafilomycin A1 (Baf A1) and hydroxychloroquine (HCQ). Molecular investigations reveal that autophagy induction along with mTOR and ULK1 de-phosphorylation upon Met-TKI treatment could be relieved by hepatocyte growth factor (HGF) and mTOR agonist MHY1485 (MHY), suggesting that autophagy was initiated by Met-TKIs via Met/mTOR/ULK1 cascade. Intriguingly, Met-TKIs further suppressed cell survival and tumor growth in the presence of autophagy blockade in Met-amplified GC preclinical models. Thus, these findings indicate Met/mTOR/ULK1 cascade responsible for Met-TKI-mediated autophagy and Met-TKIs combined with autophagy inhibitors as a promising choice to treat Met-amplified GC.
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Affiliation(s)
- Xiaoting Lin
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Zhi Peng
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Xiaojuan Wang
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Jianling Zou
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Dongshao Chen
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Zuhua Chen
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Zhongwu Li
- Department of Pathology, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Bin Dong
- Department of Pathology, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, 100142, China
| | - Jing Gao
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China.
| | - Lin Shen
- Department of Gastrointestinal Oncology, Peking University Cancer Hospital & Institute, Beijing, 100142, China.
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13
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Li X, Zhang S, Chiu AP, Lo LH, Huang J, Rowlands DK, Wang J, Keng VW. Targeting of AKT/ERK/CTNNB1 by DAW22 as a potential therapeutic compound for malignant peripheral nerve sheath tumor. Cancer Med 2018; 7:4791-4800. [PMID: 30112810 PMCID: PMC6144169 DOI: 10.1002/cam4.1732] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 07/11/2018] [Accepted: 07/25/2018] [Indexed: 01/30/2023] Open
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are an aggressive form of soft tissue neoplasm with extremely poor prognosis and no effective medical options currently available. MPNSTs can occur either sporadically or in association with the neurofibromatosis type 1 (NF1) syndrome. Importantly, activation of RAS/RAF/MEK/ERK, PI3K/AKT/mTOR, and WNT/CTNNB1 signaling pathways has been reported in both NF1-related and late-stage sporadic MPNSTs. In this study, we found that DAW22, a natural sesquiterpene coumarin compound isolated from Ferula ferulaeoides (Steud.) Korov., could inhibit cell proliferation and colony formation in five established human MPNST cancer cell lines. Further molecular mechanism exploration indicated that DAW22 could target the main components in the MPNST tumorigenic pathways: namely suppress phosphorylation of AKT and ERK, and reduce levels of non-phospho (active) CTNNB1. Using the xenograft mouse model transplanted with human MPNST cancer cell line, daily treatment with DAW22 for 25 days was effective in reducing tumor growth. These results support DAW22 as an alternative therapeutic compound for MPNST treatment by affecting multiple signaling transduction pathways in its disease progression.
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Affiliation(s)
- Xiao‐Xiao Li
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityKowloonHong Kong
| | - Shi‐Jie Zhang
- Institute of Clinical PharmacologyGuangzhou University of Chinese MedicineGuangzhouChina
| | - Amy P. Chiu
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityKowloonHong Kong
| | - Lilian H. Lo
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityKowloonHong Kong
| | - Jian Huang
- Department of Medicinal Chemistry and Natural Medicine Chemistry (State‐Province Key Laboratories of Biomedicine‐Pharmaceutics of China)Harbin Medical UniversityHarbinChina
| | - Dewi K. Rowlands
- Laboratory Animal Services CentreThe Chinese University of Hong KongSha TinNew TerritoriesHong Kong
| | - Jinhui Wang
- Department of Medicinal Chemistry and Natural Medicine Chemistry (State‐Province Key Laboratories of Biomedicine‐Pharmaceutics of China)Harbin Medical UniversityHarbinChina
| | - Vincent W. Keng
- Department of Applied Biology and Chemical TechnologyThe Hong Kong Polytechnic UniversityKowloonHong Kong
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14
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Neurofibromin level directs RAS pathway signaling and mediates sensitivity to targeted agents in malignant peripheral nerve sheath tumors. Oncotarget 2018; 9:22571-22585. [PMID: 29854299 PMCID: PMC5978249 DOI: 10.18632/oncotarget.25181] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 04/04/2018] [Indexed: 12/11/2022] Open
Abstract
Malignant peripheral nerve sheath tumor (MPNST) is a type of soft-tissue sarcoma strongly associated with dysfunction in neurofibromin; an inhibitor of the RAS pathway. We performed high-throughput screening of an array of FDA approved and promising agents in clinical development both alone and in combination at physiologically achievable concentrations against a panel of established MPNST cell line models. We found that drugs targeting a variety of factors in the RAS pathway can effectively lead to cell death in vitro with considerable drug combination synergy in regimens that target MEK or mTOR. We observed that the degree of relative sensitivity to chemotherapeutic agents was associated with the status of neurofibromin in these cell line models. Using a combination of agents that target MEK and mTORC1/2, we effectively silenced RAS/PI3K/MEK/mTOR signaling in vitro. Moreover, we employed RNAi against NF1 to establish that MPNST drug sensitivity is directly proportional to relative level of intracellular neurofibromin. Thus, two-drug combinations that target MEK and mTORC1/2 are most effective in halting the RAS signaling cascade, and the relative success of this and related small molecule interventions in MPNSTs may be predicated upon the molecular status of neurofibromin.
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15
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Wolfram J, Nizzero S, Liu H, Li F, Zhang G, Li Z, Shen H, Blanco E, Ferrari M. A chloroquine-induced macrophage-preconditioning strategy for improved nanodelivery. Sci Rep 2017; 7:13738. [PMID: 29062065 PMCID: PMC5653759 DOI: 10.1038/s41598-017-14221-2] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 10/06/2017] [Indexed: 11/09/2022] Open
Abstract
Site-specific localization is critical for improving the therapeutic efficacy and safety of drugs. Nanoparticles have emerged as promising tools for localized drug delivery. However, over 90% of systemically injected nanocarriers typically accumulate in the liver and spleen due to resident macrophages that form the mononuclear phagocyte system. In this study, the clinically approved antimalarial agent chloroquine was shown to reduce nanoparticle uptake in macrophages by suppressing endocytosis. Pretreatment of mice with a clinically relevant dose of chloroquine substantially decreased the accumulation of liposomes and silicon particles in the mononuclear phagocyte system and improved tumoritropic and organotropic delivery. The novel use of chloroquine as a macrophage-preconditioning agent presents a straightforward approach for addressing a major barrier in nanomedicine. Moreover, this priming strategy has broad applicability for improving the biodistribution and performance of particulate delivery systems. Ultimately, this study defines a paradigm for the combined use of macrophage-modulating agents with nanotherapeutics for improved site-specific delivery.
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Affiliation(s)
- Joy Wolfram
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA. .,Department of Transplantation, Mayo Clinic, Jacksonville, FL, 32224, USA.
| | - Sara Nizzero
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA.,Applied Physics Graduate Program, Rice University, Houston, TX, 77005, USA
| | - Haoran Liu
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Feng Li
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Guodong Zhang
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Zheng Li
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Haifa Shen
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA.,Department of Cell and Developmental Biology, Weill Cornell Medicine, New York, NY, 10065, USA
| | - Elvin Blanco
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Mauro Ferrari
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, 77030, USA. .,Department of Medicine, Weill Cornell Medicine, Weill Cornell Medicine, New York, NY, 10065, USA.
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16
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Zhu X, Ji M, Han Y, Guo Y, Zhu W, Gao F, Yang X, Zhang C. PGRMC1-dependent autophagy by hyperoside induces apoptosis and sensitizes ovarian cancer cells to cisplatin treatment. Int J Oncol 2017; 50:835-846. [PMID: 28197632 DOI: 10.3892/ijo.2017.3873] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 12/12/2016] [Indexed: 11/06/2022] Open
Abstract
Cisplatin treatment some times leads to chemoresistance, which is now acknowledged partially due to the inductive expression of progesterone receptor membrane component (PGRMC)1 in ovarian cancer cells. PGRMC1 enhances autophagy, activates cytochrome p450, and inveigles signaling pathways to promote cell survival and reduce the effect of drug treatments. In this study, we give first line evidence that hyperoside inhibits cell viability, triggers autophagy and apoptosis in ovarian cancer cell lines. Mechanistically, PGRMC1-dependent autophagy was utilized by hyperoside to induce apoptotic cell death. Hyperoside induced the conversion of LC3B-I to LC3B-II and the formation of autophagosomes in ovarian cancer cells. Notably, PGRMC1 colocolized with LC3B‑II, and PGRMC1 overexpression enhanced hyperoside-induced autophagy and apoptosis, while PGRMC1 knockdown abrogated the action. Additionally, AKT signaling and Bcl-2 family were also involved in the hyperoside-induced autophagy and apoptosis. Importantly, in cisplatin-resistant ovarian cancer cells where PGRMC1 was overexpressed, hyperoside sensitized the cells to cisplatin treatment. Together these findings indicate hyperoside functions as a complementary therapy for ovarian cancer patients receiving platinum-based therapy.
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Affiliation(s)
- Xiaofei Zhu
- Department of Laboratory Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Mingde Ji
- Department of Laboratory Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Yue Han
- Department of Gynecology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Yuanyuan Guo
- Department of Biochemistry, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, P.R. China
| | - Wenqiang Zhu
- Department of Surgical Oncology, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Feng Gao
- Department of Laboratory Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Xuewen Yang
- Department of Laboratory Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Chunbing Zhang
- Department of Laboratory Medicine, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
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17
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An X, Sarmiento C, Tan T, Zhu H. Regulation of multidrug resistance by microRNAs in anti-cancer therapy. Acta Pharm Sin B 2017; 7:38-51. [PMID: 28119807 PMCID: PMC5237711 DOI: 10.1016/j.apsb.2016.09.002] [Citation(s) in RCA: 137] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/30/2016] [Accepted: 07/06/2016] [Indexed: 12/31/2022] Open
Abstract
Multidrug resistance (MDR) remains a major clinical obstacle to successful cancer treatment. Although diverse mechanisms of MDR have been well elucidated, such as dysregulation of drugs transporters, defects of apoptosis and autophagy machinery, alterations of drug metabolism and drug targets, disrupti on of redox homeostasis, the exact mechanisms of MDR in a specific cancer patient and the cross-talk among these different mechanisms and how they are regulated are poorly understood. MicroRNAs (miRNAs) are a new class of small noncoding RNAs that could control the global activity of the cell by post-transcriptionally regulating a large variety of target genes and proteins expression. Accumulating evidence shows that miRNAs play a key regulatory role in MDR through modulating various drug resistant mechanisms mentioned above, thereby holding much promise for developing novel and more effective individualized therapies for cancer treatment. This review summarizes the various MDR mechanisms and mainly focuses on the role of miRNAs in regulating MDR in cancer treatment.
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Affiliation(s)
- Xin An
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, China
- Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Cesar Sarmiento
- Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Tao Tan
- Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
- Corresponding authors..
| | - Hua Zhu
- Department of Surgery, Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
- Corresponding authors..
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18
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Yang X, Niu B, Wang L, Chen M, Kang X, Wang L, Ji Y, Zhong J. Autophagy inhibition enhances colorectal cancer apoptosis induced by dual phosphatidylinositol 3-kinase/mammalian target of rapamycin inhibitor NVP-BEZ235. Oncol Lett 2016; 12:102-106. [PMID: 27347108 PMCID: PMC4906634 DOI: 10.3892/ol.2016.4590] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 05/17/2016] [Indexed: 12/31/2022] Open
Abstract
Phosphatidylinositol 3-kinase (PI3K)/mammalian target of rapamycin (mTOR) signaling pathway performs a central role in tumorigenesis and is constitutively activated in many malignancies. As a novel dual PI3K/mTOR inhibitor currently undergoing evaluation in a phase I/II clinical trial, NVP-BEZ235 indicates a significant antitumor efficacy in diverse solid tumors, including colorectal cancer (CRC). Autophagy is a catabolic process that maintains cellular homeostasis and reduces diverse stresses through lysosomal recycling of the unnecessary and damaged cell components. This process is also observed to antagonize the antitumor efficacy of PI3K/mTOR inhibitor agents such as NVP-BEZ235, via apoptosis inhibition. In the present study, we investigated anti-proliferative and apoptosis-inducing ability of NVP-BEZ235 in SW480 cells and the crosstalk between autophagy and apoptosis in SW480 cells treated with NVP-BEZ235 in combination with an autophagy inhibitor. The results revealed that, NVP-BEZ235 effectively inhibit the growth of SW480 cells by targeting the PI3K/mTOR signaling pathway and induced apoptosis. The inhibition of autophagy with 3-methyladenine or chloroquine inhibitors in combination with NVP-BEZ235 in SW480 cells enhanced the apoptotic rate as componets to NVP-BEZ235 alone. In conclusion, the findings provide a rationale for chemotherapy targeting the PI3K/mTOR signaling pathway presenting a potential therapeutic strategy to enhance the efficacy of dual PI3K/mTOR inhibitor NVP-BEZ235 in combination with an autophagy inhibitor in CRC treatment and treatment of other tumors.
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Affiliation(s)
- Xiaoyu Yang
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Bingxuan Niu
- College of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Libo Wang
- Department of Gastroenterology, The First Affiliated Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Meiling Chen
- Department of Oncology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China
| | - Xiaochun Kang
- Department of Oncology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China
| | - Luonan Wang
- Department of Oncology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China
| | - Yinghua Ji
- Department of Oncology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China
| | - Jiateng Zhong
- Department of Pathology, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
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19
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Blockage of glutaminolysis enhances the sensitivity of ovarian cancer cells to PI3K/mTOR inhibition involvement of STAT3 signaling. Tumour Biol 2016; 37:11007-15. [PMID: 26894601 DOI: 10.1007/s13277-016-4984-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 02/07/2016] [Indexed: 12/30/2022] Open
Abstract
The PI3K/Akt/mTOR axis in ovarian cancer is frequently activated and implicated in tumorigenesis. Specific targeting of this pathway is therefore an attractive therapeutic approach for ovarian cancer. However, ovarian cancer cells are resistant to PP242, a dual inhibitor of mTORC1 and mTORC2. Interestingly, blockage of GLS1 with a selective inhibitor, CB839, or siRNA dramatically sensitized the PP242-induced cell death, as evident from increased PARP cleavage. The anti-cancer activity of CB-839 and PP242 was abrogated by the addition of the TCA cycle product α-ketoglutarate, indicating the critical function of GLS1 in ovarian cancer cell survival. Finally, glutaminolysis inhibition activated apoptosis and synergistically sensitized ovarian cancer cells to priming with the mTOR inhibitor PP242. GLS1 inhibition significantly reduced phosphorylated STAT3 expression in ovarian cancer cells. These findings show that targeting glutamine addiction via GLS1 inhibition offers a potential novel therapeutic strategy to overcome resistance to PI3K/Akt/mTOR inhibition.
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20
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Inhibition of autophagy sensitizes malignant pleural mesothelioma cells to dual PI3K/mTOR inhibitors. Cell Death Dis 2015; 6:e1757. [PMID: 25950487 PMCID: PMC4669703 DOI: 10.1038/cddis.2015.124] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 03/26/2015] [Accepted: 03/30/2015] [Indexed: 01/01/2023]
Abstract
Malignant pleural mesothelioma (MPM) originates in most of the cases from chronic inflammation of the mesothelium due to exposure to asbestos fibers. Given the limited effect of chemotherapy, a big effort is being made to find new treatment options. The PI3K/mTOR pathway was reported to be upregulated in MPM. We tested the cell growth inhibition properties of two dual PI3K/mTOR inhibitors NVP-BEZ235 and GDC-0980 on 19 MPM cell lines. We could identify resistant and sensitive lines; however, there was no correlation to the downregulation of PI3K/mTOR activity markers. As a result of mTOR inhibition, both drugs efficiently induced long-term autophagy but not cell death. Autophagy blockade by chloroquine in combination with the dual PI3K/mTOR inhibitors significantly induced caspase-independent cell death involving RIP1 in the sensitive cell line SPC212. Cell death in the resistant cell line Mero-82 was less pronounced, and it was not induced via RIP1-dependent mechanism, suggesting the involvement of RIP1 downstream effectors. Cell death induction was confirmed in 3D systems. Based on these results, we identify autophagy as one of the main mechanisms of cell death resistance against dual PI3K/mTOR inhibitors in MPM. As PI3K/mTOR inhibitors are under investigation in clinical trials, these results may help interpreting their outcome and suggest ways for intervention.
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Zhao XG, Sun RJ, Yang XY, Liu DY, Lei DP, Jin T, Pan XL. Chloroquine-enhanced efficacy of cisplatin in the treatment of hypopharyngeal carcinoma in xenograft mice. PLoS One 2015; 10:e0126147. [PMID: 25923669 PMCID: PMC4414471 DOI: 10.1371/journal.pone.0126147] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 03/30/2015] [Indexed: 12/13/2022] Open
Abstract
Hypopharyngeal squamous cell carcinoma (HSCC) has the worst prognosis among head and neck cancers. Cisplatin (DDP)-based chemotherapy is an important part of multimodal treatments. However, resistance to DDP severely impairs the effectiveness of chemotherapy for HSCC. Chloroquine (CQ) has been reported to enhance the effectiveness of chemotherapy and radiotherapy in liver, pancreas, breast, prostate and colon tumors, but it is unclear whether CQ could increase the efficacy of DDP for treating HSCC. We inoculated BALB/c nude mice with a subcutaneous injection of human hypopharyngeal FaDu cells to generate our animal model. Mice were randomly divided into 4 groups and treated with vehicle control, CQ (60 mg/kg/day), DDP (5 mg/kg/6 days), or a combination of DDP and CQ. Tumor growth and survival of the mice were monitored. We found that CQ inhibited autophagy and increased DDP-induced apoptosis in the xenograft mouse model. CQ enhanced the efficacy of DDP, resulting in decreased tumor growth and prolonged survival of the mice. To test whether blocking autophagy enhanced the efficacy of DDP, FaDu cells were infected with lentiviral shRNA to Beclin-1 and inoculated into the flanks of nude mice. Inhibition of autophagy markedly enhanced the DDP-induced antitumor effect. Our study suggests that the addition of CQ to DDP-based chemotherapy could be a potential therapeutic strategy for treating HSCC, and the inhibition of autophagy may contribute to chemotherapy sensitization in HSCC.
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Affiliation(s)
- Xing-guo Zhao
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Rui-jie Sun
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Xiao-yan Yang
- Key Laboratory of Cardiovascular Remodeling and Function Research, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Da-yu Liu
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Da-peng Lei
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Tong Jin
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
| | - Xin-liang Pan
- Department of Otolaryngology, Qilu Hospital, Shandong University, Jinan, Shandong Province, China
- * E-mail:
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Chu QSC, Nielsen TO, Alcindor T, Gupta A, Endo M, Goytain A, Xu H, Verma S, Tozer R, Knowling M, Bramwell VB, Powers J, Seymour LK, Eisenhauer EA. A phase II study of SB939, a novel pan-histone deacetylase inhibitor, in patients with translocation-associated recurrent/metastatic sarcomas-NCIC-CTG IND 200†. Ann Oncol 2015; 26:973-981. [PMID: 25632070 DOI: 10.1093/annonc/mdv033] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 01/09/2015] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND A subgroup of sarcomas is characterized by defining chromosomal translocations, creating fusion transcription factor oncogenes. Resultant fusion oncoproteins associate with chromatin-modifying complexes containing histone deacetylases (HDAC), and lead to epigenetic transcriptional dysregulation. HDAC inhibitors were shown to be effective in vitro, reversing gene repression by these complexes, restoring PTEN expression and apoptosis via the PI3K/Akt/mTOR pathway. PATIENTS AND METHODS SB939 is an oral inhibitor of classes 1 and 2 HDAC. Eligible patients with recurrent or metastatic translocation-associated sarcoma (TAS) by local pathology were treated with 60 mg/day every other day for 3 of 4 weeks. Central pathology review was conducted with fusion oncogenes characterized, and HDAC2 expression correlated with efficacy in pre-specified methods. RESULTS Twenty-two patients were treated with a median of 2 cycles. Fourteen patients were assessable for response with confirmed specific chromosomal translocations; 8 had a best response of stable disease (SD) (median duration 5.4 months) with no confirmed objective responses. The 3-month progression-free survival (PFS) rate was 49%. Among those with HDAC2 score ≥5, 7/10 had SD, versus 0/3 with HDAC2 score <5. SB939 was considered as well tolerated with <10% patients experienced ≥grade 3 toxicity. CONCLUSION This study was stopped prematurely due to prolonged unavailability of SB939. No objective responses were seen. Although the observed SD in HDAC2 high patients was interesting, due to the small sample size, no definitive conclusion can be drawn about the efficacy of SB939 in this patient population. CLINICAL TRIAL NCT01112384.
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Affiliation(s)
- Q S-C Chu
- Division of Medical Oncology, Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton.
| | - T O Nielsen
- Department of Pathology, British Columbia Cancer Agency, Vancouver
| | - T Alcindor
- Division of Medical Oncology, Department of Oncology, McGill University, Montreal
| | - A Gupta
- Division of Medical Oncology, Department of Oncology, Mount Sinai Hospital/Princess Margaret Hospital, University of Toronto, Toronto, Canada
| | - M Endo
- Department of Orthopedic Surgery, Kyushu University, Fukuoka, Japan
| | - A Goytain
- Department of Pathology, British Columbia Cancer Agency, Vancouver
| | - H Xu
- Investigational New Drug Program, NCIC-Clinical Trials Group, Kingston
| | - S Verma
- Department of Medical Oncology, Ottawa Cancer Centre, University of Ottawa, Ottawa
| | - R Tozer
- Division of Medical Oncology, Department of Oncology, Jurvinski Cancer Centre, McMaster University, Hamilton
| | - M Knowling
- Department of Pathology, British Columbia Cancer Agency, Vancouver
| | - V B Bramwell
- Division of Medical Oncology, Department of Oncology, Tom Baker Cancer Centre, University of Calgary, Calgary, Canada
| | - J Powers
- Investigational New Drug Program, NCIC-Clinical Trials Group, Kingston
| | - L K Seymour
- Investigational New Drug Program, NCIC-Clinical Trials Group, Kingston
| | - E A Eisenhauer
- Investigational New Drug Program, NCIC-Clinical Trials Group, Kingston
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Mabuchi S, Sasano T, Kawano M, Kuroda H, Kimura T. Targeting mTOR Signaling in Ovarian Cancer. CURRENT OBSTETRICS AND GYNECOLOGY REPORTS 2015. [DOI: 10.1007/s13669-014-0102-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Bhattacharya B, Low SHH, Soh C, Kamal Mustapa N, Beloueche-Babari M, Koh KX, Loh J, Soong R. Increased drug resistance is associated with reduced glucose levels and an enhanced glycolysis phenotype. Br J Pharmacol 2015; 171:3255-67. [PMID: 24597478 DOI: 10.1111/bph.12668] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 02/25/2014] [Accepted: 02/28/2014] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND AND PURPOSE The testing of anticancer compounds in vitro is usually performed in hyperglycaemic cell cultures, although many tumours and their in vivo microenvironments are hypoglycaemic. Here, we have assessed, in cultures of tumour cells, the effects of reduced glucose levels on resistance to anticancer drugs and investigated the underlying cellular mechanisms. EXPERIMENTAL APPROACH PIK3CA mutant (AGS, HGC27), and wild-type (MKN45, NUGC4) gastric cancer cells were cultured in high-glucose (HG, 25 mM) or low-glucose (LG, 5 mM) media and tested for sensitivity to two cytotoxic compounds, 5-fluorouracil (5-FU) and carboplatin, the PI3K/mTOR inhibitor, PI103 and the mTOR inhibitor, Ku-0063794. KEY RESULTS All cells had increased resistance to 5-FU and carboplatin when cultured in LG compared with HG conditions despite having similar growth and cell cycle characteristics. On treatment with PI103 or Ku-0063794, only the PIK3CA mutant cells displayed increased resistance in LG conditions. The PIK3CA mutant LG cells had selectively increased p-mTOR, p-S6, p-4EBP1, GLUT1 and lactate production, and reduced reactive oxygen species, consistent with increased glycolysis. Combination analysis indicated PI103 and Ku-0063794 were synergistic in PIK3CA mutant LG cells only. Synergism was accompanied by reduced mTOR signalling and increased autophagy. CONCLUSIONS AND IMPLICATIONS Hypoglycaemia increased resistance to cytotoxic agents, especially in tumour cells with a high dependence on glycolysis. Dual inhibition of the PI3K/mTOR pathway may be able to attenuate such hypoglycaemia-associated resistance.
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Affiliation(s)
- B Bhattacharya
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
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25
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Yu X, Long YC, Shen HM. Differential regulatory functions of three classes of phosphatidylinositol and phosphoinositide 3-kinases in autophagy. Autophagy 2015; 11:1711-28. [PMID: 26018563 PMCID: PMC4824607 DOI: 10.1080/15548627.2015.1043076] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 04/11/2015] [Accepted: 04/14/2015] [Indexed: 02/06/2023] Open
Abstract
Autophagy is an evolutionarily conserved and exquisitely regulated self-eating cellular process with important biological functions. Phosphatidylinositol 3-kinases (PtdIns3Ks) and phosphoinositide 3-kinases (PI3Ks) are involved in the autophagic process. Here we aim to recapitulate how 3 classes of these lipid kinases differentially regulate autophagy. Generally, activation of the class I PI3K suppresses autophagy, via the well-established PI3K-AKT-MTOR (mechanistic target of rapamycin) complex 1 (MTORC1) pathway. In contrast, the class III PtdIns3K catalytic subunit PIK3C3/Vps34 forms a protein complex with BECN1 and PIK3R4 and produces phosphatidylinositol 3-phosphate (PtdIns3P), which is required for the initiation and progression of autophagy. The class II enzyme emerged only recently as an alternative source of PtdIns3P and autophagic initiator. However, the orthodox paradigm is challenged by findings that the PIK3CB catalytic subunit of class I PI3K acts as a positive regulator of autophagy, and PIK3C3 was thought to be an amino acid sensor for MTOR, which curbs autophagy. At present, a number of PtdIns3K and PI3K inhibitors, including specific PIK3C3 inhibitors, have been developed for suppression of autophagy and for clinical applications in autophagy-related human diseases.
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Affiliation(s)
- Xinlei Yu
- a Department of Biochemistry; Yong Loo Lin School of Medicine, National University of Singapore ; Singapore
| | - Yun Chau Long
- a Department of Biochemistry; Yong Loo Lin School of Medicine, National University of Singapore ; Singapore
| | - Han-Ming Shen
- b Department of Physiology; Yong Loo Lin School of Medicine, National University of Singapore ; Singapore
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Abstract
The mammalian target of rapamycin (mTOR) has emerged as a potential target for drug development, particularly due to the fact that it plays such a crucial role in cancer biology. In addition, next-generation mTOR inhibitors have become available, marking an exciting new phase in mTOR-based therapy. However, the verdict on their therapeutic efectiveness remains unclear. Here we review phosphatidylinositol-3-kinase (PI3K)/Akt/mTOR signaling as one of the primary mechanisms for sustaining tumor outgrowth and metastasis, recent advances in the development of mTOR inhibitors, and current studies addressing mTOR activation/inhibition in colorectal cancer (CRC). We will also discuss our recent comparative study of diferent mTOR inhibitors in a population of colon cancer stem cells (CSCs), and current major challenges for achieving individualized drug therapy using kinase inhibitors.
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Papadopoulos KP, Egile C, Ruiz-Soto R, Jiang J, Shi W, Bentzien F, Rasco D, Abrisqueta P, Vose JM, Tabernero J. Efficacy, safety, pharmacokinetics and pharmacodynamics of SAR245409 (voxtalisib, XL765), an orally administered phosphoinositide 3-kinase/mammalian target of rapamycin inhibitor: a phase 1 expansion cohort in patients with relapsed or refractory lymphoma. Leuk Lymphoma 2014; 56:1763-70. [PMID: 25300944 DOI: 10.3109/10428194.2014.974040] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The maximum tolerated dose of SAR245409 (voxtalisib), a pan-class I phosphoinositide 3-kinase (PI3K) and mammalian target of rapamycin (mTOR) inhibitor, was determined in a phase 1 dose-escalation study in advanced solid tumors. We report safety, pharmacokinetics (PK), pharmacodynamics and preliminary efficacy of SAR245409 capsules 50 mg twice daily in an expansion cohort of 16 patients with relapsed/refractory lymphoma. The most common treatment-related adverse events (AEs) were nausea (31.3%) and diarrhea (25.0%). The most common grade 3/4 treatment-related AE was increased alanine aminotransferase (12.5%). PK results were consistent with solid tumors, confirming a relatively short steady-state half-life (mean 4.61 h). Among 12 evaluable patients, one complete response and two partial responses were achieved in patients with and without PI3K/mTOR pathway alterations. In a patient with mantle cell lymphoma achieving PR, SAR245409 was associated with significant inhibition of PI3K/mTOR and extracellular signal-related kinase (ERK) pathways. Preliminary efficacy warrants further evaluation of SAR245409 in lymphoma.
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28
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Lau D, Moon DH, Park P, Hervey-Jumper S, McKeever PE, Orringer DA. Radiation-induced intradural malignant peripheral nerve sheath tumor of the cauda equina with diffuse leptomeningeal metastasis. J Neurosurg Spine 2014; 21:719-26. [DOI: 10.3171/2014.7.spine13802] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are rare, affecting only a small portion of the general population. In many cases, MPNSTs occur in association with neurofibromatosis Type 1 and at times arise secondary to previous radiation therapy (RT). These tumors can be found essentially anywhere a peripheral nerve is present, but they rarely originate primarily from the spinal nerve or cauda equina and cause leptomeningeal spread. This report describes the treatment course of a 43-year-old man with a history of testicular seminoma treated with RT a decade before, who was found to have a large sacral MPNST. The patient underwent complete sacrectomy for gross-total resection. Despite this effort, he was eventually found to have metastatic lesions throughout the spine and brain, ultimately resulting in acute hydrocephalus and death. Biopsy results of these metastatic lesions proved to be characteristic of his original MPNST. The literature is also reviewed and the diagnostic modalities, management strategies, and prognosis of MPNST are discussed.
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Affiliation(s)
- Darryl Lau
- 1Department of Neurological Surgery, University of California, San Francisco, California
| | | | - Paul Park
- 4Neurosurgery, University of Michigan, Ann Arbor, Michigan
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Santulli G, Totary-Jain H. Tailoring mTOR-based therapy: molecular evidence and clinical challenges. Pharmacogenomics 2014; 14:1517-26. [PMID: 24024901 DOI: 10.2217/pgs.13.143] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The mTOR signaling pathway integrates inputs from a variety of upstream stimuli to regulate diverse cellular processes including proliferation, growth, survival, motility, autophagy, protein synthesis and metabolism. The mTOR pathway is dysregulated in a number of human pathologies including cancer, diabetes, obesity, autoimmune disorders, neurological disease and aging. Ongoing clinical trials testing mTOR-targeted treatments number in the hundreds and underscore its therapeutic potential. To date mTOR inhibitors are clinically approved to prevent organ rejection, to inhibit restenosis after angioplasty, and to treat several advanced cancers. In this review we discuss the continuously evolving field of mTOR pharmacogenomics, as well as highlight the emerging efforts in identifying diagnostic and prognostic markers, including miRNAs, in order to assess successful therapeutic responses.
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Affiliation(s)
- Gaetano Santulli
- Department of Physiology & Cellular Biophysics, The Clyde & Helen Wu Center for Molecular Cardiology, Columbia University Medical Center, New York, NY 10032, USA
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30
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Kuo WL, Sharifi MN, Lingen MW, Ahmed O, Liu J, Nagilla M, Macleod KF, Cohen EEW. p62/SQSTM1 accumulation in squamous cell carcinoma of head and neck predicts sensitivity to phosphatidylinositol 3-kinase pathway inhibitors. PLoS One 2014; 9:e90171. [PMID: 24599075 PMCID: PMC3943907 DOI: 10.1371/journal.pone.0090171] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 01/23/2014] [Indexed: 11/25/2022] Open
Abstract
The phosphoinositol-3 kinase (PI3K) pathway is highly dysregulated in squamous cell carcinoma of the head and neck (SCCHN). While inhibitors of the PI3K/AKT pathway are being developed in cancer, their efficacy does not appear to be related to the presence of mutations or amplification in pathway genes. The PI3K pathway is a major regulator of macro-autophagy, an evolutionarily conserved catabolic process that degrades cellular materials to promote cellular homeostasis and survival under stress. Employing a panel of SCCHN cell lines, we observed a significant correlation between the activity of PI3K/AKT inhibitors and their ability to induce autophagy. More specifically, resistance to these inhibitors was associated with accumulation of p62/SQSTM1, a pleotropic protein that is consumed during autophagy, while loss of autophagy was, for the first time, found to be due to silencing of an essential autophagy gene, ATG7. Moreover, modulating ATG7 and p62/SQSTM1 could regulate sensitivity to PI3K/AKT inhibitors, underscoring a mechanistic link between autophagy and drug sensitivity. Analysis of human tissues revealed progressive accumulation of p62/SQSTM1 in a significant proportion of cancer samples compared to normal tissue, suggesting that defective autophagy has relevance to SCCHN. These findings are further validated by analysis of TCGA data confirming homozygous deletion and mRNA down-regulation of ATG7 in 10.0% of SCCHN samples. Taken together, these data indicate that p62/SQSTM1 levels modulate sensitivity to PI3K/AKT inhibitors; cancers vary in their capacity to undergo autophagy through epigenetic modification and, when deficient, accumulate p62/SQSTM1; and expression of autophagy-related proteins may serve as markers for resistance to PI3K/AKT inhibitors in SCCHN.
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Affiliation(s)
- Wen-Liang Kuo
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Marina N Sharifi
- Committee on Cancer Biology, University of Chicago, Chicago, Illinois, United States of America; Ben May Department for Cancer Research, University of Chicago, Chicago, Illinois, United States of America
| | - Mark W Lingen
- Committee on Cancer Biology, University of Chicago, Chicago, Illinois, United States of America; Department of Pathology, University of Chicago, Chicago, Illinois, United States of America; Comprehensive Cancer Center; University of Chicago, Chicago, Illinois, United States of America
| | - Omar Ahmed
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Jing Liu
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Madhavi Nagilla
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America
| | - Kay F Macleod
- Committee on Cancer Biology, University of Chicago, Chicago, Illinois, United States of America; Ben May Department for Cancer Research, University of Chicago, Chicago, Illinois, United States of America; Comprehensive Cancer Center; University of Chicago, Chicago, Illinois, United States of America
| | - Ezra E W Cohen
- Department of Medicine, University of Chicago, Chicago, Illinois, United States of America; Committee on Cancer Biology, University of Chicago, Chicago, Illinois, United States of America; Comprehensive Cancer Center; University of Chicago, Chicago, Illinois, United States of America
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Farid M, Demicco EG, Garcia R, Ahn L, Merola PR, Cioffi A, Maki RG. Malignant peripheral nerve sheath tumors. Oncologist 2014; 19:193-201. [PMID: 24470531 PMCID: PMC3926794 DOI: 10.1634/theoncologist.2013-0328] [Citation(s) in RCA: 213] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 11/16/2013] [Indexed: 12/12/2022] Open
Abstract
Malignant peripheral nerve sheath tumors (MPNST) are uncommon, biologically aggressive soft tissue sarcomas of neural origin that pose tremendous challenges to effective therapy. In 50% of cases, they occur in the context of neurofibromatosis type I, characterized by loss of function mutations to the tumor suppressor neurofibromin; the remainder arise sporadically or following radiation therapy. Prognosis is generally poor, with high rates of relapse following multimodality therapy in early disease, low response rates to cytotoxic chemotherapy in advanced disease, and propensity for rapid disease progression and high mortality. The last few years have seen an explosion in data surrounding the potential molecular drivers and targets for therapy above and beyond neurofibromin loss. These data span multiple nodes at various levels of cellular control, including major signal transduction pathways, angiogenesis, apoptosis, mitosis, and epigenetics. These include classical cancer-driving genetic aberrations such as TP53 and phosphatase and tensin homolog (PTEN) loss of function, and upregulation of mitogen-activated protein kinase (MAPK) and (mechanistic) target of rapamycin (TOR) pathways, as well as less ubiquitous molecular abnormalities involving inhibitors of apoptosis proteins, aurora kinases, and the Wingless/int (Wnt) signaling pathway. We review the current understanding of MPNST biology, current best practices of management, and recent research developments in this disease, with a view to informing future advancements in patient care.
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Affiliation(s)
- Mohamad Farid
- Tisch Cancer Institute, Mount Sinai School of Medicine, New York, New York, USA
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Sui X, Chen R, Wang Z, Huang Z, Kong N, Zhang M, Han W, Lou F, Yang J, Zhang Q, Wang X, He C, Pan H. Autophagy and chemotherapy resistance: a promising therapeutic target for cancer treatment. Cell Death Dis 2013; 4:e838. [PMID: 24113172 PMCID: PMC3824660 DOI: 10.1038/cddis.2013.350] [Citation(s) in RCA: 907] [Impact Index Per Article: 82.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 08/25/2013] [Accepted: 08/27/2013] [Indexed: 01/11/2023]
Abstract
Induction of cell death and inhibition of cell survival are the main principles of cancer therapy. Resistance to chemotherapeutic agents is a major problem in oncology, which limits the effectiveness of anticancer drugs. A variety of factors contribute to drug resistance, including host factors, specific genetic or epigenetic alterations in the cancer cells and so on. Although various mechanisms by which cancer cells become resistant to anticancer drugs in the microenvironment have been well elucidated, how to circumvent this resistance to improve anticancer efficacy remains to be defined. Autophagy, an important homeostatic cellular recycling mechanism, is now emerging as a crucial player in response to metabolic and therapeutic stresses, which attempts to maintain/restore metabolic homeostasis through the catabolic lysis of excessive or unnecessary proteins and injured or aged organelles. Recently, several studies have shown that autophagy constitutes a potential target for cancer therapy and the induction of autophagy in response to therapeutics can be viewed as having a prodeath or a prosurvival role, which contributes to the anticancer efficacy of these drugs as well as drug resistance. Thus, understanding the novel function of autophagy may allow us to develop a promising therapeutic strategy to enhance the effects of chemotherapy and improve clinical outcomes in the treatment of cancer patients.
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Affiliation(s)
- X Sui
- Department of Medical Oncology, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou, China
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Dodd RD, Mito JK, Eward WC, Chitalia R, Sachdeva M, Ma Y, Barretina J, Dodd L, Kirsch DG. NF1 deletion generates multiple subtypes of soft-tissue sarcoma that respond to MEK inhibition. Mol Cancer Ther 2013; 12:1906-17. [PMID: 23858101 PMCID: PMC3825462 DOI: 10.1158/1535-7163.mct-13-0189] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Soft-tissue sarcomas are a heterogeneous group of tumors arising from connective tissue. Recently, mutations in the neurofibromin 1 (NF1) tumor suppressor gene were identified in multiple subtypes of human soft-tissue sarcomas. To study the effect of NF1 inactivation in the initiation and progression of distinct sarcoma subtypes, we have developed a novel mouse model of temporally and spatially restricted NF1-deleted sarcoma. To generate primary sarcomas, we inject adenovirus containing Cre recombinase into NF1(flox/flox); Ink4a/Arf(flox/flox) mice at two distinct orthotopic sites: intramuscularly or in the sciatic nerve. The mice develop either high-grade myogenic sarcomas or malignant peripheral nerve sheath tumor (MPNST)-like tumors, respectively. These tumors reflect the histologic properties and spectrum of sarcomas found in patients. To explore the use of this model for preclinical studies, we conducted a study of mitogen-activated protein kinase (MAPK) pathway inhibition with the MEK inhibitor PD325901. Treatment with PD325901 delays tumor growth through decreased cyclin D1 mRNA and cell proliferation. We also examined the effects of MEK inhibition on the native tumor stroma and find that PD325901 decreases VEGFα expression in tumor cells with a corresponding decrease in microvessel density. Taken together, our results use a primary tumor model to show that sarcomas can be generated by loss of NF1 and Ink4a/Arf, and that these tumors are sensitive to MEK inhibition by direct effects on tumor cells and the surrounding microenvironment. These studies suggest that MEK inhibitors should be further explored as potential sarcoma therapies in patients with tumors containing NF1 deletion.
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Affiliation(s)
- Rebecca D Dodd
- Corresponding Author: David G. Kirsch, Duke University Medical Center, Box 91006, Durham, NC 27708.
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Abstract
Autophagy is a tightly controlled self-degradation process utilised by cells to sustain cellular homeostasis and to support cell survival in response to metabolic stress and starvation. Thus, autophagy plays a critical role in promoting cell integrity and maintaining proper function of cellular processes. Defects in autophagy, however, can have drastic implications in human health and diseases, including cancer. Described as a double-edged sword in the context of cancer, autophagy can act as both suppressor and facilitator of tumorigenesis. As such, defining the precise role of autophagy in a multistep event like cancer progression can be complex. Recent findings have implicated a role for components of the autophagy pathway in oncogene-mediated cell transformation, tumour growth, and survival. Notably, aggressive cancers driven by Ras oncoproteins rely on autophagy to sustain a reprogrammed mitochondrial metabolic signature and evade cell death. In this review, we summarize our current understanding of the role of oncogene-induced autophagy in cancer progression and discuss how modulators of autophagic responses can bring about therapeutic benefit and eradication of a subset of cancers that are addicted to this ancient recycling machinery.
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Anthricin Isolated from Anthriscus sylvestris (L.) Hoffm. Inhibits the Growth of Breast Cancer Cells by Inhibiting Akt/mTOR Signaling, and Its Apoptotic Effects Are Enhanced by Autophagy Inhibition. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:385219. [PMID: 23818925 PMCID: PMC3681310 DOI: 10.1155/2013/385219] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 05/08/2013] [Accepted: 05/08/2013] [Indexed: 12/20/2022]
Abstract
Anthricin (deoxypodophyllotoxin) is a natural product isolated from Anthriscus sylvestris (L.) Hoffm. (Apiaceae). Here, we investigated the effect of anthricin on autophagy and mammalian target of rapamycin (mTOR) signaling as anticancer actions in breast cancer cells. Many studies have supported the contention that the phosphoinositide 3-kinase (PI3K)/Akt/mTORC1 pathway is considerably deregulated in breast cancer and that autophagy plays important roles in the development of this type of cancer, although the exact underlying mechanisms remain unknown. Our data confirmed that anthricin markedly induced apoptosis in 2 breast cancer cell lines, MCF7 (estrogen receptor positive) and MDA-MB-231 (estrogen receptor, progesterone receptor, and Her2/Neu receptor negative). Anthricin treatment decreased the levels of phosphorylated Akt and mTORC1, followed by inhibition of cell growth. Interestingly, blockage of autophagy by a pharmacological inhibitor or genetic deletion of ULK1 and Atg13 accelerated anthricin-induced apoptosis, suggesting that autophagy has cytoprotective effects. Taken together, our results indicate that anthricin is an inhibitor of mTOR and that a combination of an autophagy inhibitor and anthricin may serve as a new promising strategy for the treatment of breast cancer cells.
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Forward genetic screen for malignant peripheral nerve sheath tumor formation identifies new genes and pathways driving tumorigenesis. Nat Genet 2013; 45:756-66. [PMID: 23685747 PMCID: PMC3695033 DOI: 10.1038/ng.2641] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 04/25/2013] [Indexed: 12/27/2022]
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are sarcomas of Schwann cell-lineage origin that occur sporadically or in association with the inherited syndrome, Neurofibromatosis Type 1. To identify genetic drivers of MPNST development, we utilized the Sleeping Beauty (SB) transposon-based somatic mutagenesis system in mice with somatic loss of tumor protein p53 (Trp53) function and/or overexpression of epidermal growth factor receptor (EGFR). Common insertion site (CIS) analysis of 269 neurofibromas and 106 MPNSTs identified 695 and 87 sites with a statistically significant number of recurrent transposon insertions, respectively. Comparison to human data sets revealed novel and known driver genes for MPNST formation at these sites. Pairwise co-occurrence analysis of CIS-associated genes identified many cooperating mutations that are enriched for in Wnt/CTNNB1, PI3K/Akt/mTor, and growth factor receptor signaling pathways. Lastly, we identified several novel proto-oncogenes including forkhead box R2 (Foxr2), which we functionally validated as a proto-oncogene involved in MPNST maintenance.
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Xie X, White EP, Mehnert JM. Coordinate autophagy and mTOR pathway inhibition enhances cell death in melanoma. PLoS One 2013; 8:e55096. [PMID: 23383069 PMCID: PMC3559441 DOI: 10.1371/journal.pone.0055096] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 12/19/2012] [Indexed: 02/07/2023] Open
Abstract
The phosphatidylinositol 3-kinase/AKT/mammalian target of rapamycin (PI3K/AKT/mTOR) pathway promotes melanoma tumor growth and survival while suppressing autophagy, a catabolic process through which cells collect and recycle cellular components to sustain energy homeostasis in starvation. Conversely, inhibitors of the PI3K/AKT/mTOR pathway, in particular the mTOR inhibitor temsirolimus (CCI-779), induce autophagy, which can promote tumor survival and thus, these agents potentially limit their own efficacy. We hypothesized that inhibition of autophagy in combination with mTOR inhibition would block this tumor survival mechanism and hence improve the cytotoxicity of mTOR inhibitors in melanoma. Here we found that melanoma cell lines of multiple genotypes exhibit high basal levels of autophagy. Knockdown of expression of the essential autophagy gene product ATG7 resulted in cell death, indicating that survival of melanoma cells is autophagy-dependent. We also found that the lysosomotropic agent and autophagy inhibitor hydroxychloroquine (HCQ) synergizes with CCI-779 and led to melanoma cell death via apoptosis. Combination treatment with CCI-779 and HCQ suppressed melanoma growth and induced cell death both in 3-dimensional (3D) spheroid cultures and in tumor xenografts. These data suggest that coordinate inhibition of the mTOR and autophagy pathways promotes apoptosis and could be a new therapeutic paradigm for the treatment of melanoma.
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Affiliation(s)
- Xiaoqi Xie
- The Cancer Institute of New Jersey, New Brunswick, New Jersey, United States of America
- Division of Medical Oncology, Department of Medicine, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
| | - Eileen P. White
- The Cancer Institute of New Jersey, New Brunswick, New Jersey, United States of America
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey, United States of America
- University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
| | - Janice M. Mehnert
- The Cancer Institute of New Jersey, New Brunswick, New Jersey, United States of America
- Division of Medical Oncology, Department of Medicine, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
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Bristol ML, Emery SM, Maycotte P, Thorburn A, Chakradeo S, Gewirtz DA. Autophagy inhibition for chemosensitization and radiosensitization in cancer: do the preclinical data support this therapeutic strategy? J Pharmacol Exp Ther 2013; 344:544-52. [PMID: 23291713 DOI: 10.1124/jpet.112.199802] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Recognition of the cytoprotective functions of autophagy that occur in tumor cells exposed to various forms of chemotherapy or radiation has generated intense interest in the possibility that pharmacological interference with autophagy could provide a clinical strategy for overcoming therapeutic resistance. Multiple clinical trials are currently in progress to evaluate the antimalarial agent chloroquine (generally in its clinical formulation as hydroxychloroquine) and its impact on various forms of cancer therapy. In this commentary/review, we focus on the relatively limited number of studies in the literature where chloroquine has been tested in combination with chemotherapy or radiation in experimental tumor-bearing animal models. We also present recent data from our own laboratories, in cell culture experiments as well as in vivo studies, which demonstrate that neither chloroquine nor silencing of an autophagy regulatory gene was effective in conferring radiation sensitivity in an experimental model of breast cancer. The capacity for sensitization by chloroquine appears to be quite wide-ranging, with dramatic effects for some drugs/tumor models and modest or minimal effects in others. One possible caveat is that, with only a few exceptions, experiments have generally been performed in xenograft models, thereby eliminating the involvement of the immune system, which might ultimately be proven to play a central role in determining the effectiveness of autophagy inhibition in chemosensitization or radiosensitization. Nevertheless, a careful review of the current literature suggests that caution is likely to be warranted in translating preclinical findings relating to autophagy inhibition as an adjunctive therapeutic strategy.
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Affiliation(s)
- Molly L Bristol
- Department of Pathology, Virginia Commonwealth University, Richmond, VA, USA
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