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Lu J, Xu F, Rao C, Shen C, Jin J, Zhu Z, Wang C, Li Q. Mechanism of action of paclitaxel for treating glioblastoma based on single-cell RNA sequencing data and network pharmacology. Front Pharmacol 2022; 13:1076958. [PMID: 36506527 PMCID: PMC9727555 DOI: 10.3389/fphar.2022.1076958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 11/11/2022] [Indexed: 11/22/2022] Open
Abstract
Paclitaxel is an herbal active ingredient used in clinical practice that shows anti-tumor effects. However, its biological activity, mechanism, and cancer cell-killing effects remain unknown. Information on the chemical gene interactions of paclitaxel was obtained from the Comparative Toxicogenomics Database, SwishTargetPrediction, Binding DB, and TargetNet databases. Gene expression data were obtained from the GSE4290 dataset. Differential gene analysis, Kyoto Encyclopedia of Genes and Genomes, and Gene Ontology analyses were performed. Gene set enrichment analysis was performed to evaluate disease pathway activation; weighted gene co-expression network analysis with diff analysis was used to identify disease-associated genes, analyze differential genes, and identify drug targets via protein-protein interactions. The Molecular Complex Detection (MCODE) analysis of critical subgroup networks was conducted to identify essential genes affected by paclitaxel, assess crucial cluster gene expression differences in glioma versus standard samples, and perform receiver operator characteristic mapping. To evaluate the pharmacological targets and signaling pathways of paclitaxel in glioblastoma, the single-cell GSE148196 dataset was acquired from the Gene Expression Omnibus database and preprocessed using Seurat software. Based on the single-cell RNA-sequencing dataset, 24 cell clusters were identified, along with marker genes for the two different cell types in each cluster. Correlation analysis revealed that the mechanism of paclitaxel treatment involves effects on neurons. Paclitaxel may affect glioblastoma by improving glucose metabolism and processes involved in modulating immune function in the body.
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Wu Y, Rakotoarisoa M, Angelov B, Deng Y, Angelova A. Self-Assembled Nanoscale Materials for Neuronal Regeneration: A Focus on BDNF Protein and Nucleic Acid Biotherapeutic Delivery. NANOMATERIALS 2022; 12:nano12132267. [PMID: 35808102 PMCID: PMC9268293 DOI: 10.3390/nano12132267] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/26/2022] [Accepted: 06/27/2022] [Indexed: 02/04/2023]
Abstract
Enabling challenging applications of nanomedicine and precision medicine in the treatment of neurodegenerative disorders requires deeper investigations of nanocarrier-mediated biomolecular delivery for neuronal targeting and recovery. The successful use of macromolecular biotherapeutics (recombinant growth factors, antibodies, enzymes, synthetic peptides, cell-penetrating peptide–drug conjugates, and RNAi sequences) in clinical developments for neuronal regeneration should benefit from the recent strategies for enhancement of their bioavailability. We highlight the advances in the development of nanoscale materials for drug delivery in neurodegenerative disorders. The emphasis is placed on nanoformulations for the delivery of brain-derived neurotrophic factor (BDNF) using different types of lipidic nanocarriers (liposomes, liquid crystalline or solid lipid nanoparticles) and polymer-based scaffolds, nanofibers and hydrogels. Self-assembled soft-matter nanoscale materials show favorable neuroprotective characteristics, safety, and efficacy profiles in drug delivery to the central and peripheral nervous systems. The advances summarized here indicate that neuroprotective biomolecule-loaded nanoparticles and injectable hydrogels can improve neuronal survival and reduce tissue injury. Certain recently reported neuronal dysfunctions in long-COVID-19 survivors represent early manifestations of neurodegenerative pathologies. Therefore, BDNF delivery systems may also help in prospective studies on recovery from long-term COVID-19 neurological complications and be considered as promising systems for personalized treatment of neuronal dysfunctions and prevention or retarding of neurodegenerative disorders.
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Affiliation(s)
- Yu Wu
- CNRS, Institut Galien Paris-Saclay, Université Paris-Saclay, F-92290 Châtenay-Malabry, France; (Y.W.); (M.R.)
| | - Miora Rakotoarisoa
- CNRS, Institut Galien Paris-Saclay, Université Paris-Saclay, F-92290 Châtenay-Malabry, France; (Y.W.); (M.R.)
| | - Borislav Angelov
- Institute of Physics, ELI Beamlines, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ-18221 Prague, Czech Republic;
| | - Yuru Deng
- Wenzhou Institute, University of Chinese Academy of Sciences, No. 1, Jinlian Road, Longwan District, Wenzhou 325001, China;
| | - Angelina Angelova
- CNRS, Institut Galien Paris-Saclay, Université Paris-Saclay, F-92290 Châtenay-Malabry, France; (Y.W.); (M.R.)
- Correspondence:
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Habib S, Singh M. Angiopep-2-Modified Nanoparticles for Brain-Directed Delivery of Therapeutics: A Review. Polymers (Basel) 2022; 14:polym14040712. [PMID: 35215625 PMCID: PMC8878382 DOI: 10.3390/polym14040712] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/06/2022] [Accepted: 02/08/2022] [Indexed: 12/14/2022] Open
Abstract
Nanotechnology has opened up a world of possibilities for the treatment of brain disorders. Nanosystems can be designed to encapsulate, carry, and deliver a variety of therapeutic agents, including drugs and nucleic acids. Nanoparticles may also be formulated to contain photosensitizers or, on their own, serve as photothermal conversion agents for phototherapy. Furthermore, nano-delivery agents can enhance the efficacy of contrast agents for improved brain imaging and diagnostics. However, effective nano-delivery to the brain is seriously hampered by the formidable blood–brain barrier (BBB). Advances in understanding natural transport routes across the BBB have led to receptor-mediated transcytosis being exploited as a possible means of nanoparticle uptake. In this regard, the oligopeptide Angiopep-2, which has high BBB transcytosis capacity, has been utilized as a targeting ligand. Various organic and inorganic nanostructures have been functionalized with Angiopep-2 to direct therapeutic and diagnostic agents to the brain. Not only have these shown great promise in the treatment and diagnosis of brain cancer but they have also been investigated for the treatment of brain injury, stroke, epilepsy, Parkinson’s disease, and Alzheimer’s disease. This review focuses on studies conducted from 2010 to 2021 with Angiopep-2-modified nanoparticles aimed at the treatment and diagnosis of brain disorders.
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Banerjee K, Núñez FJ, Haase S, McClellan BL, Faisal SM, Carney SV, Yu J, Alghamri MS, Asad AS, Candia AJN, Varela ML, Candolfi M, Lowenstein PR, Castro MG. Current Approaches for Glioma Gene Therapy and Virotherapy. Front Mol Neurosci 2021; 14:621831. [PMID: 33790740 PMCID: PMC8006286 DOI: 10.3389/fnmol.2021.621831] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 02/16/2021] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma (GBM) is the most common and aggressive primary brain tumor in the adult population and it carries a dismal prognosis. Inefficient drug delivery across the blood brain barrier (BBB), an immunosuppressive tumor microenvironment (TME) and development of drug resistance are key barriers to successful glioma treatment. Since gliomas occur through sequential acquisition of genetic alterations, gene therapy, which enables to modification of the genetic make-up of target cells, appears to be a promising approach to overcome the obstacles encountered by current therapeutic strategies. Gene therapy is a rapidly evolving field with the ultimate goal of achieving specific delivery of therapeutic molecules using either viral or non-viral delivery vehicles. Gene therapy can also be used to enhance immune responses to tumor antigens, reprogram the TME aiming at blocking glioma-mediated immunosuppression and normalize angiogenesis. Nano-particles-mediated gene therapy is currently being developed to overcome the BBB for glioma treatment. Another approach to enhance the anti-glioma efficacy is the implementation of viro-immunotherapy using oncolytic viruses, which are immunogenic. Oncolytic viruses kill tumor cells due to cancer cell-specific viral replication, and can also initiate an anti-tumor immunity. However, concerns still remain related to off target effects, and therapeutic and transduction efficiency. In this review, we describe the rationale and strategies as well as advantages and disadvantages of current gene therapy approaches against gliomas in clinical and preclinical studies. This includes different delivery systems comprising of viral, and non-viral delivery platforms along with suicide/prodrug, oncolytic, cytokine, and tumor suppressor-mediated gene therapy approaches. In addition, advances in glioma treatment through BBB-disruptive gene therapy and anti-EGFRvIII/VEGFR gene therapy are also discussed. Finally, we discuss the results of gene therapy-mediated human clinical trials for gliomas. In summary, we highlight the progress, prospects and remaining challenges of gene therapies aiming at broadening our understanding and highlighting the therapeutic arsenal for GBM.
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Affiliation(s)
- Kaushik Banerjee
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Felipe J. Núñez
- Laboratory of Molecular and Cellular Therapy, Fundación Instituto Leloir, Buenos Aires, Argentina
| | - Santiago Haase
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Brandon L. McClellan
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Immunology Graduate Program, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Syed M. Faisal
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Stephen V. Carney
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Cancer Biology Graduate Program, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Jin Yu
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Mahmoud S. Alghamri
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Antonela S. Asad
- Departamento de Biología e Histología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Alejandro J. Nicola Candia
- Departamento de Biología e Histología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Maria Luisa Varela
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Marianela Candolfi
- Departamento de Biología e Histología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Pedro R. Lowenstein
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
| | - Maria G. Castro
- Department of Neurosurgery, University of Michigan Medical School, Ann Arbor, MI, United States
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, United States
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He C, Zhang Z, Ding Y, Xue K, Wang X, Yang R, An Y, Liu D, Hu C, Tang Q. LRP1-mediated pH-sensitive polymersomes facilitate combination therapy of glioblastoma in vitro and in vivo. J Nanobiotechnology 2021; 19:29. [PMID: 33482822 PMCID: PMC7821499 DOI: 10.1186/s12951-020-00751-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/08/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Glioblastoma (GBM) is the most invasive primary intracranial tumor, and its effective treatment is one of the most daunting challenges in oncology. The blood-brain barrier (BBB) is the main obstacle that prevents the delivery of potentially active therapeutic compounds. In this study, a new type of pH-sensitive polymersomes has been designed for glioblastoma therapy to achieve a combination of radiotherapy and chemotherapy for U87-MG human glioblastoma xenografts in nude mice and significantly increased survival time. RESULTS The Au-DOX@PO-ANG has a good ability to cross the blood-brain barrier and target tumors. This delivery system has pH-sensitivity and the ability to respond to the tumor microenvironment. Gold nanoparticles and doxorubicin are designed as a complex drug. This type of complex drug improve the radiotherapy (RT) effect of glioblastoma. The mice treated with Au-DOX@PO-ANG NPs have a significant reduction in tumor volume. CONCLUSION In summary, a new pH-sensitive drug delivery system was fabricated for the treatment of glioblastoma. The new BBB-traversing drug delivery system potentially represents a novel approach to improve the effects of the treatment of intracranial tumors and provides hope for glioblastoma treatment.
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Affiliation(s)
- Chen He
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Zhiyuan Zhang
- Department of Neurosurgery, Nanjing Jinling Hospital, Nanjing University, Nanjing, China
| | - Yinan Ding
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Kangli Xue
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Xihui Wang
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Rui Yang
- Research Institute for Reproductive Health and Genetic Diseases, The Affiliated Wuxi Maternity and Child Health Care Hospital of Nanjing Medical University, Wuxi, China
| | - Yanli An
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Dongfang Liu
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China
| | - Chunmei Hu
- Department of Tuberculosis, the Second Affiliated Hospital of Southeast University, Nanjing, China.
| | - Qiusha Tang
- Medical School of Southeast University, 87 Dingjiaqiao Road, Nanjing, China.
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Giotta Lucifero A, Luzzi S, Brambilla I, Guarracino C, Mosconi M, Foiadelli T, Savasta S. Gene therapies for high-grade gliomas: from the bench to the bedside. ACTA BIO-MEDICA : ATENEI PARMENSIS 2020; 91:32-50. [PMID: 32608374 PMCID: PMC7975827 DOI: 10.23750/abm.v91i7-s.9953] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 06/01/2020] [Indexed: 02/05/2023]
Abstract
Background: Gene therapy is the most attractive therapeutic approach against high-grade gliomas (HGGs). This is because of its theoretical capability to rework gene makeup in order to yield oncolytic effects. However, some factors still limit the upgrade of these therapies at a clinical level of evidence. We report an overview of glioblastoma gene therapies, mainly focused on the rationale, classification, advances and translational challenges. Methods: An extensive review of the online literature on gene therapy for HGGs was carried out. The PubMed/MEDLINE and ClinicalTrials.gov websites were the main sources. Articles in English published in the last five years were sorted according to the best match with the multiple relevant keywords chosen. A descriptive analysis of the clinical trials was also reported. Results: A total of 85 articles and 45 clinical trials were selected. The main types of gene therapies are the suicide gene, tumor suppressor gene, immunomodulatory gene and oncolytic therapies (virotherapies). The transfer of genetic material entails replication-deficient and replication-competent oncolytic viruses and nanoparticles, such as liposomes and cationic polymers, each of them having advantages and drawbacks. Forty-eight clinical trials were collected, mostly phase I/II. Conclusion: Gene therapies constitute a promising approach against HGGs. The selection of new and more effective target genes, the implementation of gene-delivery vectors capable of greater and safer spreading capacity, and the optimization of the administration routes constitute the main translational challenges of this approach. (www.actabiomedica.it)
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Affiliation(s)
- Alice Giotta Lucifero
- Neurosurgery Unit, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.
| | - Sabino Luzzi
- Neurosurgery Unit, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy; Neurosurgery Unit, Department of Surgical Sciences, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
| | - Ilaria Brambilla
- Pediatric Clinic, Department of Pediatrics, Fondazione IRCCS Policlinico San Matteo, Uni-versity of Pavia, Pavia, Italy.
| | - Carmen Guarracino
- Pediatric Clinic, Department of Pediatrics, Fondazione IRCCS Policlinico San Matteo, Uni-versity of Pavia, Pavia, Italy.
| | - Mario Mosconi
- Orthopaedic and Traumatology Unit, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy.
| | - Thomas Foiadelli
- Pediatric Clinic, Department of Pediatrics, Fondazione IRCCS Policlinico San Matteo, Uni-versity of Pavia, Pavia, Italy.
| | - Salvatore Savasta
- Pediatric Clinic, Department of Pediatrics, Fondazione IRCCS Policlinico San Matteo, Uni-versity of Pavia, Pavia, Italy.
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Double-Edged Lipid Nanoparticles Combining Liposome-Bound TRAIL and Encapsulated Doxorubicin Showing an Extraordinary Synergistic Pro-Apoptotic Potential. Cancers (Basel) 2019; 11:cancers11121948. [PMID: 31817469 PMCID: PMC6966652 DOI: 10.3390/cancers11121948] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/27/2019] [Accepted: 11/28/2019] [Indexed: 12/29/2022] Open
Abstract
Although TRAIL (TNF-related apoptosis-inducing ligand, also known as Apo2L) was described as capable of inducing apoptosis in transformed cells while sparing normal cells, limited results obtained in clinical trials has limited its use as an anti-tumor agent. Consequently, novel TRAIL formulations with enhanced bioactivity are necessary for overcoming resistance to conventional soluble TRAIL (sTRAIL) exhibited by many primary tumors. Our group has generated artificial liposomes with sTRAIL anchored on their surface (large unilamellar vesicle (LUV)-TRAIL), which have shown a greater cytotoxic activity both in vitro and in vivo when compared to sTRAIL against distinct hematologic and epithelial carcinoma cells. In this study, we have improved LUV-TRAIL by loading doxorubicin (DOX) in its liposomal lumen (LUVDOX-TRAIL) in order to improve their cytotoxic potential. LUVDOX-TRAIL killed not only to a higher extent, but also with a much faster kinetic than LUV-TRAIL. In addition, the concerted action of the liposomal DOX and TRAIL was specific of the liposomal DOX and was not observed when with soluble DOX. The cytotoxicity induced by LUVDOX-TRAIL was proven to rely on two processes due to different molecular mechanisms: a dynamin-mediated internalization of the doxorubicin-loaded particle, and the strong activation of caspase-8 exerted by the liposomal TRAIL. Finally, greater cytotoxic activity of LUVDOX-TRAIL was also observed in vivo in a tumor xenograft model. Therefore, we developed a novel double-edged nanoparticle combining the cytotoxic potential of DOX and TRAIL, showing an exceptional and remarkable synergistic effect between both agents.
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Zhu Y, Liu C, Pang Z. Dendrimer-Based Drug Delivery Systems for Brain Targeting. Biomolecules 2019; 9:E790. [PMID: 31783573 PMCID: PMC6995517 DOI: 10.3390/biom9120790] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/14/2019] [Accepted: 11/22/2019] [Indexed: 02/06/2023] Open
Abstract
Human neuroscience has made remarkable progress in understanding basic aspects of functional organization; it is a renowned fact that the blood-brain barrier (BBB) impedes the permeation and access of most drugs to central nervous system (CNS) and that many neurological diseases remain undertreated. Therefore, a number of nanocarriers have been designed over the past few decades to deliver drugs to the brain. Among these nanomaterials, dendrimers have procured an enormous attention from scholars because of their nanoscale uniform size, ease of multi-functionalization, and available internal cavities. As hyper-branched 3D macromolecules, dendrimers can be maneuvered to transport diverse therapeutic agents, incorporating small molecules, peptides, and genes; diminishing their cytotoxicity; and improving their efficacy. Herein, the present review will give exhaustive details of extensive researches in the field of dendrimer-based vehicles to deliver drugs through the BBB in a secure and effectual manner. It is also a souvenir in commemorating Donald A. Tomalia on his 80th birthday.
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Affiliation(s)
- Yuefei Zhu
- Key Laboratory of Smart Drug Delivery, School of Pharmacy, Fudan University, Ministry of Education, 826 Zhangheng Road, Shanghai 201203, China; (Y.Z.); (C.L.)
- Department of Biomedical Engineering, Columbia University Medical Center, 3960 Broadway, New York, NY 10032, USA
| | - Chunying Liu
- Key Laboratory of Smart Drug Delivery, School of Pharmacy, Fudan University, Ministry of Education, 826 Zhangheng Road, Shanghai 201203, China; (Y.Z.); (C.L.)
| | - Zhiqing Pang
- Key Laboratory of Smart Drug Delivery, School of Pharmacy, Fudan University, Ministry of Education, 826 Zhangheng Road, Shanghai 201203, China; (Y.Z.); (C.L.)
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Sahoo S, Kayal S, Poddar P, Dhara D. Redox-Responsive Efficient DNA and Drug Co-Release from Micelleplexes Formed from a Fluorescent Cationic Amphiphilic Polymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14616-14627. [PMID: 31613101 DOI: 10.1021/acs.langmuir.9b02921] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cationic polymeric micelles that are capable of co-releasing drugs and DNA into cells have attracted considerable interest as combination chemotherapy in cancer treatment. To this effect, we have presently developed a cationic fluorescent amphiphilic copolymer, poly(N,N'-dimethylaminoethylmethacrylate)-b-(poly(2-(methacryloyl)oxyethyl-2'-hydroxyethyl disulfidecholate)-r-2-(methacryloyloxy)ethyl-1-pyrenebutyrate) [PDMAEMA-b-(PMAODCA-r-PPBA)], having pendent cholate moiety linked through a redox-responsive disulfide bond. The amphiphilic nature of the copolymer facilitated the formation of cationic micellar nanoparticles in aqueous medium. The self-assembly of the copolymer to form micelles and subsequent destabilization of the micelles in the presence of glutathione (GSH) was monitored by the change in the fluorescence characteristic of the attached pyrene resulting from alteration in the hydrophobicity of its neighborhood. These micellar nanoparticles were subsequently utilized in encapsulating hydrophobic anticancer drug, doxorubicin (DOX), in the core of the micelles, whereas the cationic shell of the micelles was used for complexation with oppositely charged DNA to form micelleplexes. Gel retardation assays, ethidium bromide (EB) exclusion assay, and DLS and AFM studies confirmed the successful binding of the cationic micelles with DNA. The binding capability of the micelles was higher than corresponding cationic linear PDMAEMA. The kinetics of the simultaneous release of encapsulated DOX and complexed DNA in the presence of glutathione was thoroughly studied using various techniques. All the experiments showed fast and efficient release of DOX and DNA from DOX-loaded micelleplexes. The study implies that these redox-responsive cationic micelles may open up new opportunities toward co-delivery of DNA and anticancer drugs in combinatorial therapy.
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Affiliation(s)
- Satyagopal Sahoo
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur , West Bengal 721302 , India
| | - Shibayan Kayal
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur , West Bengal 721302 , India
| | - Puja Poddar
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur , West Bengal 721302 , India
| | - Dibakar Dhara
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur , West Bengal 721302 , India
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Qu F, Wang P, Zhang K, Shi Y, Li Y, Li C, Lu J, Liu Q, Wang X. Manipulation of Mitophagy by "All-in-One" nanosensitizer augments sonodynamic glioma therapy. Autophagy 2019; 16:1413-1435. [PMID: 31674265 PMCID: PMC7480814 DOI: 10.1080/15548627.2019.1687210] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Limited penetration of chemotherapeutic drugs through the blood brain barrier (BBB), and the increased chemo-resistance of glioma cells due to macroautophagy/autophagy, result in high tumor recurrence and extremely limited survival of glioma patients. Ultrasound-targeted microbubble destruction (UTMD) is a technique of transient and reversible BBB disruption, which greatly facilitates intracerebral drug delivery. In addition, sonodynamic therapy (SDT) based on ultrasound stimulation and a sonosensitizer, can be a safe and noninvasive strategy for treating glioma. We innovatively designed a smart "all-in-one" nanosensitizer platform by incorporating the sonoactive chlorin e6 (Ce6) and an autophagy inhibitor-hydroxychloroquine (HCQ) into angiopep-2 peptide-modified liposomes (designated as ACHL), which integrates multiple diagnostic and therapeutic functions. ACHL selectively accumulated in the brain tumors during the optimal time-window of transient UTMD-mediated BBB opening. The nanosensitizer then responded to a second ultrasonic stimulation, and simultaneously unloaded HCQ and generated ROS in the glioma cells. The sonotherapy triggered apoptosis as well as MAPK/p38-PINK1-PRKN-dependent mitophagy, in which the antioxidant relieved the sonotoxicity and MAPK/p38 activation, while the inhibition of MAPK/p38 attenuated the progression toward mitophagy by compromising redistribution of PRKN. Moreover, HCQ blocking autophagosome degradation, augmented intracellular ROS production and resulted in an oxidative-damage regenerative loop. ACHL-SDT treatment using this construct significantly inhibited the xenograft-tumor growth and prolonged the survival time of tumor-bearing mice, exhibiting an improved therapeutic efficiency. All together, we demonstrated a precision sonotherapy with simultaneous apoptosis induction and mitophagy inhibition, which served as an intelligently strategic sense of working alongside, providing new insights into the theranostics of brain tumors. ABBREVIATIONS ACHL: Angiopep-2-modified liposomes loaded with Ce6 and hydroxychloroquine; ACL: Angiopep-2-modified liposomes loaded with Ce6; BBB: blood brain barrier; Ce6: chlorin e6; CHL: liposomes loaded with Ce6 and hydroxychloroquine; CL: liposomes loaded with Ce6; CNS: central nervous system; DDS: drug delivery system; EB: Evans blue; FUS: focused ultrasound; HCQ: hydroxychloroquine; LRP1: low density lipoprotein receptor-related protein 1; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MAPK: mitogen-activated protein kinase; MBs: microbubbles; MTG: MitoTracker Green; MTR: MitoTracker Red; MTT: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; PBS: phosphate-buffered saline; PDI: polydispersity index; PINK1: PTEN induced kinase 1; PRKN/parkin: parkin RBR E3 ubiquitin protein ligase; ROS: reactive oxygen species; SDT: sonodynamic therapy; SQSTM1: sequestome 1; TA: terephthalic acid; TEM: transmission electron microscopy; TUNEL: terminal deoxynucleotidyl transferase mediated dUTP nick-end labeling; US: ultrasound; UTMD: ultrasound-targeted microbubble destruction.
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Affiliation(s)
- Fei Qu
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Pan Wang
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Kun Zhang
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Yin Shi
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Yixiang Li
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Chengren Li
- Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Army Medical University, Chongqing, China
| | - Junhan Lu
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Quanhong Liu
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Xiaobing Wang
- National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest China; Key Laboratory of Medicinal Resources and Natural Pharmaceutical Chemistry, Ministry of Education; College of Life Sciences, Shaanxi Normal University, Xi'an, China
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Zhong HH, Wang HY, Li J, Huang YZ. TRAIL-based gene delivery and therapeutic strategies. Acta Pharmacol Sin 2019; 40:1373-1385. [PMID: 31444476 PMCID: PMC6889127 DOI: 10.1038/s41401-019-0287-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/04/2019] [Indexed: 12/11/2022] Open
Abstract
TRAIL (tumor necrosis factor-related apoptosis-inducing ligand), also known as APO2L, belongs to the tumor necrosis factor family. By binding to the death receptor 4 (DR4) or DR5, TRAIL induces apoptosis of tumor cells without causing side toxicity in normal tissues. In recent years TRAIL-based therapy has attracted great attention for its promise of serving as a cancer drug candidate. However, the treatment efficacy of TRAIL protein was under expectation in the clinical trials because of the short half-life and the resistance of cancer cells. TRAIL gene transfection can produce a "bystander effect" of tumor cell killing and provide a potential solution to TRAIL-based cancer therapy. In this review we focus on TRAIL gene therapy and various design strategies of TRAIL DNA delivery including non-viral vectors and cell-based TRAIL therapy. In order to sensitize the tumor cells to TRAIL-induced apoptosis, combination therapy of TRAIL DNA with other drugs by the codelivery methods for yielding a synergistic antitumor efficacy is summarized. The opportunities and challenges of TRAIL-based gene delivery and therapy are discussed.
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Affiliation(s)
- Hui-Hai Zhong
- Shanghai University College of Sciences, Shanghai, 200444, China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Hui-Yuan Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China
| | - Jian Li
- Shanghai University College of Sciences, Shanghai, 200444, China
| | - Yong-Zhuo Huang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
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12
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Liu G, Gao N, Zhou Y, Nie J, Cheng W, Luo M, Mei L, Zeng X, Deng W. Polydopamine-Based "Four-in-One" Versatile Nanoplatforms for Targeted Dual Chemo and Photothermal Synergistic Cancer Therapy. Pharmaceutics 2019; 11:E507. [PMID: 31581532 PMCID: PMC6835447 DOI: 10.3390/pharmaceutics11100507] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Revised: 09/11/2019] [Accepted: 09/26/2019] [Indexed: 12/27/2022] Open
Abstract
Abstract: The development of versatile nanoscale drug delivery systems that integrate with multiple therapeutic agents or methods and improve the efficacy of cancer therapy is urgently required. To satisfy this demand, polydopamine (PDA)-modified polymeric nanoplatforms were constructed for the dual loading of chemotherapeutic drugs. The hydrophobic anticancer drug docetaxel (DTX) was loaded into the polymeric nanoparticles (NPs) which were fabricated from the star-shaped copolymer CA-PLGA. Then DTX-loaded NPs were coated with PDA, followed by conjugation of polyelethyl glycol (PEG)-modified targeting ligand aptamer AS1411(Apt) and adsorption of the hydrophilic anticancer drug doxorubicin (DOX). This "four-in-one" nanoplatform, referred to as DTX/NPs@PDA/DOX-PEG-Apt, demonstrated high near-infrared photothermal conversion efficiency and exhibited pH and thermo-responsive drug release behavior. Furthermore, it was able to specifically target MCF-7 human breast carcinoma cells and provide synergistic chemo-photothermal therapy to further improve the anticancer effect both in vitro and in vivo, providing a novel promising strategy for cancer therapy.
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Affiliation(s)
- Gan Liu
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
| | - Nansha Gao
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
| | - Yun Zhou
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
| | - Junpeng Nie
- Division of Life and Health Sciences, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Wei Cheng
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
- Division of Life and Health Sciences, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Miaomiao Luo
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
| | - Lin Mei
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
- Division of Life and Health Sciences, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Xiaowei Zeng
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
- Division of Life and Health Sciences, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Wenbin Deng
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China.
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13
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Sun X, Chen Y, Zhao H, Qiao G, Liu M, Zhang C, Cui D, Ma L. Dual-modified cationic liposomes loaded with paclitaxel and survivin siRNA for targeted imaging and therapy of cancer stem cells in brain glioma. Drug Deliv 2019; 25:1718-1727. [PMID: 30269613 PMCID: PMC6171435 DOI: 10.1080/10717544.2018.1494225] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Development of safe, efficient nanocomplex for targeted imaging and therapy of cancer stem cells in brain glioma has become a great challenge. Herein, a low-density lipoprotein receptor-related protein and a RNA aptamer bound CD133 were used as dual-targeting ligands to prepare dual-modified cationic liposomes (DP-CLPs) loaded with survivin siRNA and paclitaxel (DP-CLPs–PTX–siRNA) for actively targeting imaging and treating CD133+ glioma stem cells after passing through the blood–brain barrier. After being administrated with DP-CLPs–PTX–siRNA nanocomplex, DP-CLPs showed a persistent target ability to bind glioma cells and brain microvascular endothelial cells (BCECs) and to deliver drugs (PTX/siRNA) to CD133+ glioma stem cells. Prepared DP-CLPs–PTX–siRNA nanocomplex showed very low cytotoxicity to BCECs, but induced selectively apoptosis of CD133+ glioma stem cells, and improved CD133+ glioma stem cells' differentiation into non-stem-cell lineages, also markedly inhibited tumorigenesis, induced CD133+ glioma cell apoptosis in intracranial glioma tumor-bearing nude mice and improved survival rates. In conclusion, prepared DP-CLPs–PTX–siRNA nanocomplex selectively induced CD133+ glioma stem cell apoptosis in vitro and in vivo exhibits great potential for targeted imaging and therapy of brain glioma stem cells.
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Affiliation(s)
- Xiyang Sun
- a Department of Oncology, Tongren Hospital , Shanghai Jiao Tong University School of Medicine , Shanghai , PR China
| | - Ying Chen
- a Department of Oncology, Tongren Hospital , Shanghai Jiao Tong University School of Medicine , Shanghai , PR China
| | - Hui Zhao
- b Department of Geriatrics, Tongren Hospital , Shanghai Jiao Tong University School of Medicine , Shanghai , PR China
| | - Guanglei Qiao
- a Department of Oncology, Tongren Hospital , Shanghai Jiao Tong University School of Medicine , Shanghai , PR China
| | - Meiyang Liu
- c Institute of Nano Biomedicine and Engineering, Shanghai Engineering Research Center for Intelligent Instrument for Diagnosis and Therapy, Department of Instrument Science and Engineering , Shanghai Jiao Tong University , Shanghai , PR China
| | - Chunlei Zhang
- c Institute of Nano Biomedicine and Engineering, Shanghai Engineering Research Center for Intelligent Instrument for Diagnosis and Therapy, Department of Instrument Science and Engineering , Shanghai Jiao Tong University , Shanghai , PR China
| | - Daxiang Cui
- c Institute of Nano Biomedicine and Engineering, Shanghai Engineering Research Center for Intelligent Instrument for Diagnosis and Therapy, Department of Instrument Science and Engineering , Shanghai Jiao Tong University , Shanghai , PR China.,d National Center for Translational Medicine, Collaborative Innovational Center for System Biology , Shanghai Jiao Tong University , Shanghai , PR China
| | - Lijun Ma
- a Department of Oncology, Tongren Hospital , Shanghai Jiao Tong University School of Medicine , Shanghai , PR China
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14
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Challenges of gene delivery to the central nervous system and the growing use of biomaterial vectors. Brain Res Bull 2019; 150:216-230. [PMID: 31173859 DOI: 10.1016/j.brainresbull.2019.05.024] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 05/08/2019] [Accepted: 05/29/2019] [Indexed: 12/18/2022]
Abstract
Gene therapy is a promising form of treatment for those suffering from neurological disorders or central nervous system (CNS) injury, however, obstacles remain that limit its translational potential. The CNS is protected by the blood brain barrier, and this barrier blocks genes from traversing into the CNS if administered outside of the CNS. Viral and non-viral gene delivery vehicles, commonly referred to as vectors, are modified to enhance delivery efficiency to target locations in the CNS. Still, there are few gene therapy approaches approved by the FDA for CNS disease or injury treatment. The lack of viable clinical approaches is due, in part, to the unpredictable nature of many vector systems. In particular, safety concerns exist with the use of viral vectors for CNS gene delivery. To seek some alternatives to viral vectors, development of new non-viral, biomaterial vectors is occurring at a rapid rate. This review discusses the challenges of delivering various forms of genetic material to the CNS, the use and limitations of current viral vector delivery systems, and the use of non-viral, biomaterial vectors for CNS applications.
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15
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Zhou X, Chen F, Lu H, Kong L, Zhang S, Zhang W, Nie J, Du B, Wang X. Ionic Microgel Loaded with Gold Nanoparticles for the Synergistic Dual-Drug Delivery of Doxorubicin and Diclofenac Sodium. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01904] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xianjing Zhou
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Feng Chen
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Haipeng Lu
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Lingli Kong
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Siyu Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Wei Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | | | | | - Xinping Wang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
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16
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Raucher D. Tumor targeting peptides: novel therapeutic strategies in glioblastoma. Curr Opin Pharmacol 2019; 47:14-19. [PMID: 30776641 DOI: 10.1016/j.coph.2019.01.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 01/17/2019] [Accepted: 01/18/2019] [Indexed: 01/27/2023]
Abstract
Peptides are a promising new therapeutic approach for glioblastoma with potential for more effective targeting and fewer devastating side effects compared to conventional cancer therapies. With the specificity to target receptors which are uniquely or overexpressed on cancer cells as well as accurately targeting dysregulated signaling pathways, peptides demonstrate a high potential for the treatment of even the most aggressive cancers. By binding to these targets, peptides can be used to deliver drugs, serve as antagonists to various ligands, or, given some inherent anticancer activity, provide additional treatment options alone or in combination therapy. The highly specific targeting capacity of peptides is critical to achieve effective cancer treatment with limited side effects, and in preclinical studies peptides have shown to have both cell and blood brain barrier penetrating capacity. As tumor targeting peptides move beyond the preclinical setting, identification of additional glioblastoma-specific peptide ligands becomes imperative to expand the potential of this encouraging treatment strategy.
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Affiliation(s)
- Drazen Raucher
- Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, United States.
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17
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Bao Q, Hu P, Xu Y, Cheng T, Wei C, Pan L, Shi J. Simultaneous Blood-Brain Barrier Crossing and Protection for Stroke Treatment Based on Edaravone-Loaded Ceria Nanoparticles. ACS NANO 2018; 12:6794-6805. [PMID: 29932327 DOI: 10.1021/acsnano.8b01994] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cerebral vasculature and neuronal networks will be largely destroyed due to the oxidative damage by overproduced reactive oxygen species (ROS) during a stroke, accompanied by the symptoms of ischemic injury and blood-brain barrier (BBB) disruption. Ceria nanoparticles, acting as an effective and recyclable ROS scavenger, have been shown to be highly effective in neuroprotection. However, the brain access of nanoparticles can only be achieved by targeting the damaged area of BBB, leading to the disrupted BBB being unprotected and to turbulence of the microenvironment in the brain. Nevertheless, the integrity of the BBB will cause very limited accumulation of therapeutic nanoparticles in brain lesions. This dilemma is a great challenge in the development of efficient stroke nanotherapeutics. Herein, we have developed an effective stroke treatment agent based on monodisperse ceria nanoparticles, which are loaded with edaravone and modified with Angiopep-2 and poly(ethylene glycol) on their surface (E-A/P-CeO2). The as-designed E-A/P-CeO2 features highly effective BBB crossing via receptor-mediated transcytosis to access brain tissues and synergistic elimination of ROS by both the loaded edaravone and ceria nanoparticles. As a result, the E-A/P-CeO2 with low toxicity and excellent hemo/histocompatibility can be used to effectively treat strokes due to great intracephalic uptake enhancement and, in the meantime, effectively protect the BBB, holding great potentials in stroke therapy with much mitigated harmful side effects and sequelae.
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Affiliation(s)
- Qunqun Bao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
| | - Ping Hu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
| | - Yingying Xu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
| | - Tiansheng Cheng
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
- School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China
| | - Chenyang Wei
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
| | - Limin Pan
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
| | - Jianlin Shi
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
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18
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Chen Q, Zheng C, Li Y, Bian S, Pan H, Zhao X, Lu WW. Bone Targeted Delivery of SDF-1 via Alendronate Functionalized Nanoparticles in Guiding Stem Cell Migration. ACS APPLIED MATERIALS & INTERFACES 2018; 10:23700-23710. [PMID: 29939711 DOI: 10.1021/acsami.8b08606] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Stem cells are well-known for their great capacity for tissue regeneration. This provides a promising source for cell-based therapies in treating various bone degenerative disorders. However, the major hurdles for their application in transplantation are the poor bone marrow homing and engraftment efficiencies. Stromal cell-derived factor 1 (SDF-1) has been identified as a major stem cell homing factor. With the aims of bone targeted SDF-1 delivery and regulating MSCs migration, alendronate modified liposomal nanoparticles (Aln-Lipo) carrying SDF-1 gene were developed in this study. Alendronate modification significantly increased the mineral binding affinity of liposomes, and facilitated the gene delivery to osteoblastic cells. Up-regulated SDF-1 expression in osteoblasts triggered MSCs migration. Systemic infusion of Aln-Lipo-SDF-1 with fluorescence labeling in mice showed the accumulation in osseous tissue by biophotonic imaging. Corresponding to the delivered SDF-1, the transplanted GFP+ MSCs were attracted to bone marrow and contributed to bone regeneration. This study may provide a useful technique in regulating stem cell migration.
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Affiliation(s)
- Qingchang Chen
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
| | - Chuping Zheng
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
- School of Pharmaceutical Science , Guangzhou Medical University , Guangzhou , Guangdong , 511436 , PR China
| | - Yanqun Li
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
| | - Shaoquan Bian
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
| | - Haobo Pan
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
| | - Xiaoli Zhao
- Research Center for Human Tissues and Organs Degeneration, Institute of Biomedicine and Biotechnology , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen , 518055 , PR China
| | - William W Lu
- Department of Orthopaedic and Traumatology , The University of Hong Kong , 21 Sassoon Rd. , Pokfulam , 999077 , Hong Kong, PR China
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19
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Guimarães PP, Gaglione S, Sewastianik T, Carrasco RD, Langer R, Mitchell MJ. Nanoparticles for Immune Cytokine TRAIL-Based Cancer Therapy. ACS NANO 2018; 12:912-931. [PMID: 29378114 PMCID: PMC5834400 DOI: 10.1021/acsnano.7b05876] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The immune cytokine tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has received significant attention as a cancer therapeutic due to its ability to selectively trigger cancer cell apoptosis without causing toxicity in vivo. While TRAIL has demonstrated significant promise in preclinical studies in mice as a cancer therapeutic, challenges including poor circulation half-life, inefficient delivery to target sites, and TRAIL resistance have hindered clinical translation. Recent advances in drug delivery, materials science, and nanotechnology are now being exploited to develop next-generation nanoparticle platforms to overcome barriers to TRAIL therapeutic delivery. Here, we review the design and implementation of nanoparticles to enhance TRAIL-based cancer therapy. The platforms we discuss are diverse in their approaches to the delivery problem and provide valuable insight into guiding the design of future nanoparticle-based TRAIL cancer therapeutics to potentially enable future translation into the clinic.
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Affiliation(s)
- Pedro P.G. Guimarães
- Department of Chemical Engineering, David H. Koch Institute for Integrative Cancer Research, MIT, Cambridge, Massachusetts 02139, United States
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Stephanie Gaglione
- Department of Chemical Engineering, David H. Koch Institute for Integrative Cancer Research, MIT, Cambridge, Massachusetts 02139, United States
| | - Tomasz Sewastianik
- Department of Oncologic Pathology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02215, United States
- Department of Experimental Hematology, Institute of Hematology and Transfusion Medicine, Warsaw, Poland
| | - Ruben D. Carrasco
- Department of Oncologic Pathology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02215, United States
- Department of Pathology, Brigham & Women’s Hospital, Boston, Massachusetts 02115, United States
| | - Robert Langer
- Department of Chemical Engineering, David H. Koch Institute for Integrative Cancer Research, MIT, Cambridge, Massachusetts 02139, United States
- Corresponding Authors. .,
| | - Michael J. Mitchell
- Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Corresponding Authors. .,
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20
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Li XT, Tang W, Jiang Y, Wang XM, Wang YH, Cheng L, Meng XS. Multifunctional targeting vinorelbine plus tetrandrine liposomes for treating brain glioma along with eliminating glioma stem cells. Oncotarget 2017; 7:24604-22. [PMID: 27029055 PMCID: PMC5029727 DOI: 10.18632/oncotarget.8360] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 03/04/2016] [Indexed: 11/26/2022] Open
Abstract
Malignant brain glioma is the most lethal and aggressive type of cancer. Surgery and radiotherapy cannot eliminate all glioma stem cells (GSCs) and blood–brain barrier (BBB) restricts the movement of antitumor drugs from blood to brain, thus leading to the poor prognosis with high recurrence rate. In the present study, the targeting conjugates of cholesterol polyethylene glycol polyethylenimine (CHOL-PEG2000-PEI) and D-a-tocopheryl polyethylene glycol 1000 succinate vapreotide (TPGS1000-VAP) were newly synthesized for transporting drugs across the BBB and targeting glioma cells and GSCs. The multifunctional targeting vinorelbine plus tetrandrine liposomes were constructed by modifying the targeting conjugates. The studies were undertaken on BBB model, glioma cells, GSCs, and glioma-bearing mice. In vitro results showed that multifunctional targeting drugs-loaded liposomes with suitable physicochemical property could enhance the transport drugs across the BBB, increase the intracellular uptake, inhibit glioma cells and GSCs, penetrate and destruct the GSCs spheroids, and induce apoptosis via activating related apoptotic proteins. In vivo results demonstrated that multifunctional targeting drugs-loaded liposomes could significantly accumulate into brain tumor location, show the specificity to tumor sites, and result in a robust overall antitumor efficacy in glioma-bearing mice. These data suggested that the multifunctional targeting vinorelbine plus tetrandrine liposomes could offer a promising strategy for treating brain glioma.
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Affiliation(s)
- Xue-Tao Li
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
| | - Wei Tang
- Linyi Food and Drug Testing Center, Linyi 276000, China
| | - Ying Jiang
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
| | - Xiao-Min Wang
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
| | - Yan-Hong Wang
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
| | - Lan Cheng
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
| | - Xian-Sheng Meng
- School of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116600, China
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21
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Lu F, Pang Z, Zhao J, Jin K, Li H, Pang Q, Zhang L, Pang Z. Angiopep-2-conjugated poly(ethylene glycol)- co- poly(ε-caprolactone) polymersomes for dual-targeting drug delivery to glioma in rats. Int J Nanomedicine 2017; 12:2117-2127. [PMID: 28356732 PMCID: PMC5360408 DOI: 10.2147/ijn.s123422] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The blood–brain barrier is a formidable obstacle for glioma chemotherapy due to its compact structure and drug efflux ability. In this study, a dual-targeting drug delivery system involving Angiopep-2-conjugated biodegradable polymersomes loaded with doxorubicin (Ang-PS-DOX) was developed to exploit transport by the low-density lipoprotein receptor-related protein 1 (LRP1), which is overexpressed in both blood–brain barrier and glioma cells. The polymersomes (PS) were prepared using a thin-film hydration method. The PS were loaded with doxorubicin using the pH gradient method (Ang-PS-DOX). The resulting PS were uniformly spherical, with diameters of ~135 nm and with ~159.9 Angiopep-2 molecules on the surface of each PS. The drug-loading capacity and the encapsulation efficiency for doxorubicin were 7.94%±0.17% and 95.0%±1.6%, respectively. Permeability tests demonstrated that the proton diffusion coefficient across the PS membrane was far slower than that across the liposome membrane, and the common logarithm value was linearly dependent on the dioxane content in the external phase. Compared with PS-DOX, Ang-PS-DOX demonstrated significantly higher cellular uptake and stronger cytotoxicity in C6 cells. In vivo pharmacokinetics and brain distribution experiments revealed that Ang-PS-DOX achieved a more extensive distribution and more abundant accumulation in glioma cells than PS-DOX. Moreover, the survival time of glioma-bearing rats treated with Ang-PS-DOX was significantly prolonged compared with those treated with PS-DOX or a solution of free doxorubicin. These results suggested that Ang-PS-DOX can target glioma cells and enhance chemotherapeutic efficacy.
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Affiliation(s)
- Fei Lu
- Department of Pharmacy, Xianju People's Hospital, Xianju, Zhejiang; Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
| | - Zhiyong Pang
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai; Chongyang Center for Disease Control and Prevention, Xianning, Hubei
| | - Jingjing Zhao
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
| | - Kai Jin
- School of Life Science, Fudan University, Shanghai, People's Republic of China
| | - Haichun Li
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
| | - Qiang Pang
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
| | - Long Zhang
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
| | - Zhiqing Pang
- Department of Pharmaceutics, Key Laboratory of Smart Drug Delivery, Ministry of Education and PLA, School of Pharmacy, Fudan University, Shanghai
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22
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Ying M, Zhan C, Wang S, Yao B, Hu X, Song X, Zhang M, Wei X, Xiong Y, Lu W. Liposome-Based Systemic Glioma-Targeted Drug Delivery Enabled by All-d Peptides. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29977-29985. [PMID: 27797175 DOI: 10.1021/acsami.6b10146] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
As the most aggressive brain tumor, chemotherapy of malignant glioma remains to be extremely challenging in clinic. The blood-brain barrier (BBB) and blood-brain tumor barrier (BBTB) are physiological and pathological barriers preventing therapeutic drugs from reaching the glioma region. In addition, vasculogenic mimicry (VM) formed by invasive glioma cells instead of endothelial cells and angiogenesis are very common in glioma, leading to the poor prognosis and recurrence of glioma. An ideal drug delivery system for glioma chemotherapy needs to traverse the BBB and BBTB and then target VM, angiogenesis, and glioma cells. Herein we developed a liposome-based drug delivery system with the modification of proteolytically stable d-peptide ligands (dCDX/dA7R-LS). dCDX is a d-peptide ligand of nicotine acetylcholine receptors (nAChRs) capable of circumventing the BBB, and dA7R is a d-peptide ligand of vascular endothelial growth factor receptor 2 (VEGFR2) and neuropilin-1 (NRP-1) overexpressed on angiogenesis, VM, and glioma, presenting excellent glioma-homing property. dCDX/dA7R-LS could efficiently internalize into the brain capillary endothelial cells, glioma cells, tumor neovascular endothelial cells, and tumor spheroids and cross the in vitro BBB and BBTB models. Ex vivo imaging and in vivo immunofluorescence assays confirmed the superiority of dCDX/dA7R-LS in targeting intracranial glioma in comparison to plain liposomes or liposomes modified with an individual d-peptide ligand (either dCDX or dA7R). When loaded with doxorubicin, dCDX/dA7R-LS achieved the best antiglioma, antiangiogenesis, and anti-VM effects among all tested formulations. These results suggested that systemic glioma-targeted drug delivery enabled by all-d peptide ligands was promising for the antiglioma therapy.
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Affiliation(s)
- Man Ying
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Changyou Zhan
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
- Department of Pharmacology, School of Basic Medical Sciences, Fudan University , Shanghai 200032, China
| | - Songli Wang
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Bingxin Yao
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Xuefeng Hu
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Xianfei Song
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Mingfei Zhang
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Xiaoli Wei
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
- State Key Laboratory of Medical Neurobiology, The Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
| | - Yan Xiong
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
| | - Weiyue Lu
- Department of Pharmaceutics, School of Pharmacy, Fudan University & Key Laboratory of Smart Drug Delivery (Fudan University), Ministry of Education , Shanghai 201203, China
- State Key Laboratory of Medical Neurobiology, The Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
- State Key Laboratory of Molecular Engineering of Polymers, Fudan University , Shanghai 200433, China
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Zhang RX, Wong HL, Xue HY, Eoh JY, Wu XY. Nanomedicine of synergistic drug combinations for cancer therapy - Strategies and perspectives. J Control Release 2016; 240:489-503. [PMID: 27287891 PMCID: PMC5064882 DOI: 10.1016/j.jconrel.2016.06.012] [Citation(s) in RCA: 223] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/27/2016] [Accepted: 06/06/2016] [Indexed: 12/26/2022]
Abstract
Nanomedicine of synergistic drug combinations has shown increasing significance in cancer therapy due to its promise in providing superior therapeutic benefits to the current drug combination therapy used in clinical practice. In this article, we will examine the rationale, principles, and advantages of applying nanocarriers to improve anticancer drug combination therapy, review the use of nanocarriers for delivery of a variety of combinations of different classes of anticancer agents including small molecule drugs and biologics, and discuss the challenges and future perspectives of the nanocarrier-based combination therapy. The goal of this review is to provide better understanding of this increasingly important new paradigm of cancer treatment and key considerations for rational design of nanomedicine of synergistic drug combinations for cancer therapy.
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Affiliation(s)
- Rui Xue Zhang
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario, Canada M5S 2S2
| | - Ho Lun Wong
- Temple University School of Pharmacy, 3304 North Broad Street, Philadelphia, PA 19140, USA
| | - Hui Yi Xue
- Temple University School of Pharmacy, 3304 North Broad Street, Philadelphia, PA 19140, USA
| | - June Young Eoh
- Temple University School of Pharmacy, 3304 North Broad Street, Philadelphia, PA 19140, USA
| | - Xiao Yu Wu
- Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario, Canada M5S 2S2
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24
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Naoum GE, Tawadros F, Farooqi AA, Qureshi MZ, Tabassum S, Buchsbaum DJ, Arafat W. Role of nanotechnology and gene delivery systems in TRAIL-based therapies. Ecancermedicalscience 2016; 10:660. [PMID: 27594905 PMCID: PMC4990059 DOI: 10.3332/ecancer.2016.660] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Indexed: 12/11/2022] Open
Abstract
Since its identification as a member of the tumour necrosis factor (TNF) family, TRAIL (TNF-related apoptosis-inducing ligand) has emerged as a new avenue in apoptosis-inducing cancer therapies. Its ability to circumvent the chemoresistance of conventional therapeutics and to interact with cancer stem cells (CSCs) self-renewal pathways, amplified its potential as a cancer apoptotic agent. Many recombinant preparations of this death ligand and monoclonal antibodies targeting its death receptors have been tested in monotherapy and combinational clinical trials. Gene therapy is a new approach for cancer treatment which implies viral or non-viral functional transgene induction of apoptosis in cancer cells or repair of the underlying genetic abnormality on a molecular level. The role of this approach in overcoming the traditional barriers of radiation and chemotherapeutics systemic toxicity, risk of recurrence, and metastasis made it a promising platform for cancer treatment. The recent first Food Drug Administration (FDA) approved oncolytic herpes virus for melanoma treatment brings forth the potency of the cancer gene therapy approach in the future. Many gene delivery systems have been studied for intratumoural TRAIL gene delivery alone or in combination with chemotherapeutic agents to produce synergistic cancer cytotoxicity. However, there still remain many obstacles to be conquered for this different gene delivery systems. Nanomedicine on the other hand offers a new frontier for clinical trials and biomedical research. The FDA approved nanodrugs motivates horizon exploration for other nanoscale designed particles’ implications in gene delivery. In this review we aim to highlight the molecular role of TRAIL in apoptosis and interaction with cancer stem cells (CSCs) self-renewal pathways. Finally, we also aim to discuss the different roles of gene delivery systems, mesenchymal cells, and nanotechnology designs in TRAIL gene delivery.
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Affiliation(s)
| | - Fady Tawadros
- East Tennessee State University, 1276 Gilbreath Dr, Johnson City, TN 37604, USA
| | | | | | - Sobia Tabassum
- Institute of Biomedical and Genetic Engineering (IBGE), Islamabad, Pakistan
| | - Donald J Buchsbaum
- University of Alabama at Birmingham, 1720 2nd Ave S, Birmingham, AL 35233, USA
| | - Waleed Arafat
- University of Alabama at Birmingham, 1720 2nd Ave S, Birmingham, AL 35233, USA; University of Alexandria, El-Gaish Rd, Egypt, Alexandria, Egypt
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25
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Gao H. Progress and perspectives on targeting nanoparticles for brain drug delivery. Acta Pharm Sin B 2016; 6:268-86. [PMID: 27471668 PMCID: PMC4951594 DOI: 10.1016/j.apsb.2016.05.013] [Citation(s) in RCA: 281] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/06/2016] [Accepted: 05/09/2016] [Indexed: 02/06/2023] Open
Abstract
Due to the ability of the blood-brain barrier (BBB) to prevent the entry of drugs into the brain, it is a challenge to treat central nervous system disorders pharmacologically. The development of nanotechnology provides potential to overcome this problem. In this review, the barriers to brain-targeted drug delivery are reviewed, including the BBB, blood-brain tumor barrier (BBTB), and nose-to-brain barrier. Delivery strategies are focused on overcoming the BBB, directly targeting diseased cells in the brain, and dual-targeted delivery. The major concerns and perspectives on constructing brain-targeted delivery systems are discussed.
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26
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Gao H. Perspectives on Dual Targeting Delivery Systems for Brain Tumors. J Neuroimmune Pharmacol 2016; 12:6-16. [PMID: 27270720 DOI: 10.1007/s11481-016-9687-4] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/31/2016] [Indexed: 12/30/2022]
Abstract
Brain tumor remains one of the most serious threats to human beings. Different from peripheral tumors, drug delivery to brain tumor is largely restricted by the blood brain barrier (BBB). To fully conquer this barrier and specifically deliver drugs to brain tumor, dual targeting delivery systems were explored, which are functionalized with two active targeting ligands: one to the BBB and the other to the brain tumor. The development of dual targeting delivery system is still in its early stage, and attentions need to be paid to issues and concerns that remain unresolved in future studies.
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Affiliation(s)
- Huile Gao
- Key Laboratory of Drug Targeting and Drug Delivery Systems, West China School of Pharmacy, Sichuan University, Chengdu, China.
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27
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Gilad Y, Firer M, Gellerman G. Recent Innovations in Peptide Based Targeted Drug Delivery to Cancer Cells. Biomedicines 2016; 4:E11. [PMID: 28536378 PMCID: PMC5344250 DOI: 10.3390/biomedicines4020011] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 05/16/2016] [Accepted: 05/23/2016] [Indexed: 12/21/2022] Open
Abstract
Targeted delivery of chemotherapeutics and diagnostic agents conjugated to carrier ligands has made significant progress in recent years, both in regards to the structural design of the conjugates and their biological effectiveness. The goal of targeting specific cell surface receptors through structural compatibility has encouraged the use of peptides as highly specific carriers as short peptides are usually non-antigenic, are structurally simple and synthetically diverse. Recent years have seen many developments in the field of peptide based drug conjugates (PDCs), particularly for cancer therapy, as their use aims to bypass off-target side-effects, reducing the morbidity common to conventional chemotherapy. However, no PDCs have as yet obtained regulatory approval. In this review, we describe the evolution of the peptide-based strategy for targeted delivery of chemotherapeutics and discuss recent innovations in the arena that should lead in the near future to their clinical application.
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Affiliation(s)
- Yosi Gilad
- Department of Chemical Sciences, Ariel University, Ariel 40700, Israel.
- Department of Chemical Engineering and Biotechnology, Ariel University, Ariel 40700, Israel.
| | - Michael Firer
- Department of Chemical Engineering and Biotechnology, Ariel University, Ariel 40700, Israel.
| | - Gary Gellerman
- Department of Chemical Sciences, Ariel University, Ariel 40700, Israel.
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28
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de Miguel D, Lemke J, Anel A, Walczak H, Martinez-Lostao L. Onto better TRAILs for cancer treatment. Cell Death Differ 2016; 23:733-47. [PMID: 26943322 PMCID: PMC4832109 DOI: 10.1038/cdd.2015.174] [Citation(s) in RCA: 230] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 12/11/2015] [Accepted: 12/17/2015] [Indexed: 01/01/2023] Open
Abstract
Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL), also known as Apo-2 ligand (Apo2L), is a member of the TNF cytokine superfamily. By cross-linking TRAIL-Receptor (TRAIL-R) 1 or TRAIL-R2, also known as death receptors 4 and 5 (DR4 and DR5), TRAIL has the capability to induce apoptosis in a wide variety of tumor cells while sparing vital normal cells. The discovery of this unique property among TNF superfamily members laid the foundation for testing the clinical potential of TRAIL-R-targeting therapies in the cancer clinic. To date, two of these therapeutic strategies have been tested clinically: (i) recombinant human TRAIL and (ii) antibodies directed against TRAIL-R1 or TRAIL-R2. Unfortunately, however, these TRAIL-R agonists have basically failed as most human tumors are resistant to apoptosis induction by them. It recently emerged that this is largely due to the poor agonistic activity of these agents. Consequently, novel TRAIL-R-targeting agents with increased bioactivity are currently being developed with the aim of rendering TRAIL-based therapies more active. This review summarizes these second-generation novel formulations of TRAIL and other TRAIL-R agonists, which exhibit enhanced cytotoxic capacity toward cancer cells, thereby providing the potential of being more effective when applied clinically than first-generation TRAIL-R agonists.
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Affiliation(s)
- D de Miguel
- Departamento de Bioquímica, Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Investigación Sanitaria de Aragón, Zaragoza, Spain
| | - J Lemke
- UCL Cancer Institute, Faculty of Medical Sciences, University College London, London, UK
| | - A Anel
- Departamento de Bioquímica, Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Investigación Sanitaria de Aragón, Zaragoza, Spain
| | - H Walczak
- UCL Cancer Institute, Faculty of Medical Sciences, University College London, London, UK
| | - L Martinez-Lostao
- Departamento de Bioquímica, Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Investigación Sanitaria de Aragón, Zaragoza, Spain
- Instituto de Nanociencia de Aragón, Zaragoza, Spain
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29
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Sigg SJ, Postupalenko V, Duskey JT, Palivan CG, Meier W. Stimuli-Responsive Codelivery of Oligonucleotides and Drugs by Self-Assembled Peptide Nanoparticles. Biomacromolecules 2016; 17:935-45. [PMID: 26871486 DOI: 10.1021/acs.biomac.5b01614] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Ever more emerging combined treatments exploiting synergistic effects of drug combinations demand smart, responsive codelivery carriers to reveal their full potential. In this study, a multifunctional stimuli-responsive amphiphilic peptide was designed and synthesized to self-assemble into nanoparticles capable of co-bearing and -releasing hydrophobic drugs and antisense oligonucleotides for combined therapies. The rational design was based on a hydrophobic l-tryptophan-d-leucine repeating unit derived from a truncated sequence of gramicidin A (gT), to entrap hydrophobic cargo, which is combined with a hydrophilic moiety of histidines to provide electrostatic affinity to nucleotides. Stimuli-responsiveness was implemented by linking the hydrophobic and hydrophilic sequence through an artificial amino acid bearing a disulfide functional group (H3SSgT). Stimuli-responsive peptides self-assembled in spherical nanoparticles in sizes (100-200 nm) generally considered as preferable for drug delivery applications. Responsive peptide nanoparticles revealed notable nucleotide condensing abilities while maintaining the ability to load hydrophobic cargo. The disulfide cleavage site introduced in the peptide sequence induced responsiveness to physiological concentrations of reducing agent, serving to release the incorporated molecules. Furthermore, the peptide nanoparticles, singly loaded or coloaded with boron-dipyrromethene (BODIPY) and/or antisense oligonucleotides, were efficiently taken up by cells. Such amphiphilic peptides that led to noncytotoxic, reduction-responsive nanoparticles capable of codelivering hydrophobic and nucleic acid payloads simultaneously provide potential toward combined treatment strategies to exploit synergistic effects.
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Affiliation(s)
- Severin J Sigg
- Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Viktoriia Postupalenko
- Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Jason T Duskey
- Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel , Klingelbergstrasse 80, CH-4056 Basel, Switzerland
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30
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Kang HC, Cho H, Bae YH. DNA Polyplexes as Combinatory Drug Carriers of Doxorubicin and Cisplatin: An in Vitro Study. Mol Pharm 2015; 12:2845-57. [PMID: 26132975 DOI: 10.1021/mp500873k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Double helix nucleic acids were used as a combination drug carrier for doxorubicin (DOX), which physically intercalates with DNA double helices, and cisplatin (CDDP), which binds to DNA without an alkylation reaction. DNA interacting with DOX, CDDP, or both was complexed with positively charged, endosomolytic polymers. Compared with the free drug, the polyplexes (100-170 nm in size) delivered more drug into the cytosol and the nucleus and demonstrated similar or superior (up to a 7-fold increase) in vitro cell-killing activity. Additionally, the gene expression activities of most of the chemical drug-loaded plasmid DNA (pDNA) polyplexes were not impaired by the physical interactions between the nucleic acid and DOX/CDDP. When a model reporter pDNA (luciferase) was employed, it expressed luciferase protein at 0.7- to 1.4-fold the amount expressed by the polyplex with no bound drugs (a control), which indicated the fast translocation of the intercalated or bound drugs from the "carrier DNA" to the "nuclear DNA" of target cells. The proposed concept may offer the possibility of versatile combination therapies of genetic materials and small molecule drugs that bind to nucleic acids to treat various diseases.
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Affiliation(s)
- Han Chang Kang
- †Department of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, College of Pharmacy, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea
| | - Hana Cho
- †Department of Pharmacy and Integrated Research Institute of Pharmaceutical Sciences, College of Pharmacy, The Catholic University of Korea, 43 Jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do 420-743, Republic of Korea
| | - You Han Bae
- ‡Department of Pharmaceutics and Pharmaceutical Chemistry, The University of Utah, 30 S 2000 E, Rm 2972, Salt Lake City, Utah 84112, United States.,§Utah-Inha Drug Delivery Systems (DDS) and Advanced Therapeutics Research Center, 7-50 Songdo-dong, Yeonsu-gu, Incheon 406-840, Republic of Korea
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31
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Kang L, Gao Z, Huang W, Jin M, Wang Q. Nanocarrier-mediated co-delivery of chemotherapeutic drugs and gene agents for cancer treatment. Acta Pharm Sin B 2015; 5:169-75. [PMID: 26579443 PMCID: PMC4629232 DOI: 10.1016/j.apsb.2015.03.001] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 12/17/2014] [Accepted: 01/16/2015] [Indexed: 02/04/2023] Open
Abstract
The efficacy of chemotherapeutic drug in cancer treatment is often hampered by drug resistance of tumor cells, which is usually caused by abnormal gene expression. RNA interference mediated by siRNA and miRNA can selectively knock down the carcinogenic genes by targeting specific mRNAs. Therefore, combining chemotherapeutic drugs with gene agents could be a promising strategy for cancer therapy. Due to poor stability and solubility associated with gene agents and drugs, suitable protective carriers are needed and have been widely researched for the co-delivery. In this review, we summarize the most commonly used nanocarriers for co-delivery of chemotherapeutic drugs and gene agents, as well as the advances in co-delivery systems.
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Key Words
- ANG-CLP, angiopep-2 modified cationic liposome
- CMC, critical micelle concentration
- CPLA, cationic polylactide
- Chemotherapeutic drug
- Co-delivery
- DOTAP, 1,2-dioleoyl-3-trimethylammonium-propane
- Dendrimer
- FA, folic acid
- FCAP, ferrocenium capped amphiphilic pillar[5]arene
- GSH, glutathione
- Gene
- Liposome
- Micelle
- Nanocarrier
- OEI, oligoethylenimine
- PAMAM, poly(amido amine)
- PAsp(AED), poly(N-(2,2ʹ-dithiobis(ethylamine))aspartamide)
- PCL, poly(ε-caprolactone)
- PDMAEMA, polydimethylaminoethyl methacrylate
- PDPA, poly(2-(diisopropyl amino)ethyl methacrylate)
- PEG, polyethyleneglycol
- PEI, poly(ethyleneimine)
- PEI-Fc, ferrocene modified poly(ethyleneimine)
- PEI-PCHLG, poly(ethylene imine)-poly(γ-cholesterol-l-glutamate)
- PEI-PCL, poly(ethyleneimine) and poly(ε-caprolactone)
- PLA, polylactic acid (or polylactide)
- PLGA, poly(lactic-co-glycolic acid)
- PPEEA, poly(2-aminoethyl ethylene phosphate)
- PnBA, poly(n-butyl acrylate)
- RNAi, RNA interference
- SNPs, supramolecular nanoparticles
- SSTRs, somatostatin receptors poly(N-(2,2′-dithiobis(ethylamine))aspartamide)
- Supramolecular system
- miRNA, micro-RNA
- siRNA, small interfering RNA
- siVEGF, VEGF-targeted siRNA
- γ-CD, γ-cyclodextrin
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32
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Agile delivery of protein therapeutics to CNS. J Control Release 2014; 190:637-63. [PMID: 24956489 DOI: 10.1016/j.jconrel.2014.06.017] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/10/2014] [Accepted: 06/13/2014] [Indexed: 12/11/2022]
Abstract
A variety of therapeutic proteins have shown potential to treat central nervous system (CNS) disorders. Challenge to deliver these protein molecules to the brain is well known. Proteins administered through parenteral routes are often excluded from the brain because of their poor bioavailability and the existence of the blood-brain barrier (BBB). Barriers also exist to proteins administered through non-parenteral routes that bypass the BBB. Several strategies have shown promise in delivering proteins to the brain. This review, first, describes the physiology and pathology of the BBB that underscore the rationale and needs of each strategy to be applied. Second, major classes of protein therapeutics along with some key factors that affect their delivery outcomes are presented. Third, different routes of protein administration (parenteral, central intracerebroventricular and intraparenchymal, intranasal and intrathecal) are discussed along with key barriers to CNS delivery associated with each route. Finally, current delivery strategies involving chemical modification of proteins and use of particle-based carriers are overviewed using examples from literature and our own work. Whereas most of these studies are in the early stage, some provide proof of mechanism of increased protein delivery to the brain in relevant models of CNS diseases, while in few cases proof of concept had been attained in clinical studies. This review will be useful to broad audience of students, academicians and industry professionals who consider critical issues of protein delivery to the brain and aim developing and studying effective brain delivery systems for protein therapeutics.
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33
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Wei X, Chen X, Ying M, Lu W. Brain tumor-targeted drug delivery strategies. Acta Pharm Sin B 2014; 4:193-201. [PMID: 26579383 PMCID: PMC4629063 DOI: 10.1016/j.apsb.2014.03.001] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Revised: 02/07/2014] [Accepted: 02/24/2014] [Indexed: 12/18/2022] Open
Abstract
Despite the application of aggressive surgery, radiotherapy and chemotherapy in clinics, brain tumors are still a difficult health challenge due to their fast development and poor prognosis. Brain tumor-targeted drug delivery systems, which increase drug accumulation in the tumor region and reduce toxicity in normal brain and peripheral tissue, are a promising new approach to brain tumor treatments. Since brain tumors exhibit many distinctive characteristics relative to tumors growing in peripheral tissues, potential targets based on continuously changing vascular characteristics and the microenvironment can be utilized to facilitate effective brain tumor-targeted drug delivery. In this review, we briefly describe the physiological characteristics of brain tumors, including blood–brain/brain tumor barriers, the tumor microenvironment, and tumor stem cells. We also review targeted delivery strategies and introduce a systematic targeted drug delivery strategy to overcome the challenges.
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34
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Ligand modified nanoparticles increases cell uptake, alters endocytosis and elevates glioma distribution and internalization. Sci Rep 2014; 3:2534. [PMID: 23982586 PMCID: PMC3755284 DOI: 10.1038/srep02534] [Citation(s) in RCA: 217] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 08/12/2013] [Indexed: 12/22/2022] Open
Abstract
Nanoparticles (NPs) were widely used in drugs/probes delivery for improved disease diagnosis and/or treatment. Targeted delivery to cancer cells is a highly attractive application of NPs. However, few studies have been performed on the targeting mechanisms of these ligand-modified delivery systems. Additional studies are needed to understand the transport of nanoparticles in the cancer site, the interactions between nanoparticles and cancer cells, the intracellular trafficking of nanoparticles within the cancer cells and the subcellular destiny and potential toxicity. Interleukin 13 (IL-13) peptide can specifically bind IL-13Rα2, a receptor that is highly expressed on glioma cells but is expressed at low levels on other normal cells. It was shown that the nanoparticels modification with the IL-13 peptide could improve glioma treatment by selectively increasing cellular uptake, facilitating cell internalization, altering the uptake pathway and increasing glioma localization.
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35
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Godsey ME, Suryaprakash S, Leong KW. Materials innovation for co-delivery of diverse therapeutic cargos. RSC Adv 2013; 3:24794-24811. [PMID: 24818000 PMCID: PMC4012692 DOI: 10.1039/c3ra43094d] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Co-delivery is a rapidly growing sector of drug delivery that aspires to enhance therapeutic efficacy through controlled delivery of diverse therapeutic cargoes with synergistic activities. It requires the design of carriers capable of simultaneously transporting to and releasing multiple therapeutics at a disease site. Co-delivery has arisen from the emerging trend of combination therapy, where treatment with two or more therapeutics at the same time can succeed where single therapeutics fail. However, conventional combination therapy offers little control over achieving an optimized therapeutic ratio at the target site. Co-delivery via inclusion of multiple therapeutic cargos within the same carrier addresses this issue by not only ensuring delivery of both therapeutics to the same cell, but also offering a platform for control of the delivery process, from loading to release. Co-delivery systems have been formulated using a number of carriers previously developed for single-therapeutic delivery. Liposomes, polymeric micelles, PLGA nanoparticles, and dendrimers have all been adapted for co-delivery. Much of the effort focuses on dealing with drugs having dissimilar properties, increasing loading efficiencies, and controlling loading and release ratios. In this review, we highlight the innovations in carrier designs and formulations to deliver combination cargoes of drug/drug, drug/siRNA, and drug/pDNA toward disease therapy. With rapid advances in mechanistic understanding of interrelating molecular pathways and development of molecular medicine, the future of co-delivery will become increasingly promising and prominent.
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Affiliation(s)
- Megan E Godsey
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | - Smruthi Suryaprakash
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
| | - Kam W Leong
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA
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36
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Kwiatkowska A, Nandhu MS, Behera P, Chiocca EA, Viapiano MS. Strategies in gene therapy for glioblastoma. Cancers (Basel) 2013; 5:1271-305. [PMID: 24202446 PMCID: PMC3875940 DOI: 10.3390/cancers5041271] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 10/15/2013] [Indexed: 01/01/2023] Open
Abstract
Glioblastoma (GBM) is the most aggressive form of brain cancer, with a dismal prognosis and extremely low percentage of survivors. Novel therapies are in dire need to improve the clinical management of these tumors and extend patient survival. Genetic therapies for GBM have been postulated and attempted for the past twenty years, with variable degrees of success in pre-clinical models and clinical trials. Here we review the most common approaches to treat GBM by gene therapy, including strategies to deliver tumor-suppressor genes, suicide genes, immunomodulatory cytokines to improve immune response, and conditionally-replicating oncolytic viruses. The review focuses on the strategies used for gene delivery, including the most common and widely used vehicles (i.e., replicating and non-replicating viruses) as well as novel therapeutic approaches such as stem cell-mediated therapy and nanotechnologies used for gene delivery. We present an overview of these strategies, their targets, different advantages, and challenges for success. Finally, we discuss the potential of gene therapy-based strategies to effectively attack such a complex genetic target as GBM, alone or in combination with conventional therapy.
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Affiliation(s)
- Aneta Kwiatkowska
- Department of Neurosurgery, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
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TRAIL and paclitaxel synergize to kill U87 cells and U87-derived stem-like cells in vitro. Int J Mol Sci 2012; 13:9142-9156. [PMID: 22942757 PMCID: PMC3430288 DOI: 10.3390/ijms13079142] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 07/11/2012] [Accepted: 07/11/2012] [Indexed: 11/16/2022] Open
Abstract
U87-derived stem-like cells (U87-SLCs) were cultured using serum-free stem cell media and identified by both biological behaviors and markers. Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) and paclitaxel (PX), in combination or alone, was used to treat U87-MG human glioma cells (U87 cells) or U87-SLCs. The results showed that TRAIL/PX cannot only synergistically inhibit U87 cells but also U87-SLCs. We observed a significantly higher apoptotic rate in U87 cells simultaneously treated with TRAIL/PX for 24 h compared to cells treated with either drug alone. Furthermore, there was a remarkably higher apoptosis rate in U87-SLCs induced by the TRAIL/PX combination compared with either drug alone. Unlike the simultaneous treatment in U87 cells, U87-SLCs were pretreated for 24 h with 1 μmol/L of PX followed by 1000 ng/mL of TRAIL. Protein assays revealed that TRAIL/PX synergy was related to DR4, cleaved caspase-8 and cleaved caspase-3 upregulation, whereas the mitochondrial pathway was not involved in TRAIL-induced apoptosis. The present study indicates that PX can sensitize U87 cells and U87-SLCs to TRAIL treatment through an extrinsic pathway of cell apoptosis. The combined treatment of TRAIL and PX may be a promising glioma chemotherapy because of its successful inhibition of U87-SLCs, which are hypothesized to influence chemotherapeutic outcomes of gliomas.
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