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Rajbanshi A, Hilton E, Dreiss CA, Murnane D, Cook MT. Stimuli-Responsive Polymers for Engineered Emulsions. Macromol Rapid Commun 2024; 45:e2300723. [PMID: 38395416 DOI: 10.1002/marc.202300723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/14/2024] [Indexed: 02/25/2024]
Abstract
Emulsions are complex. Dispersing two immiscible phases, thus expanding an interface, requires effort to achieve and the resultant dispersion is thermodynamically unstable, driving the system toward coalescence. Furthermore, physical instabilities, including creaming, arise due to presence of dispersed droplets of different densities to a continuous phase. Emulsions allow the formulation of oils, can act as vehicles to solubilize both hydrophilic and lipophilic molecules, and can be tailored to desirable rheological profiles, including "gel-like" behavior and shear thinning. The usefulness of emulsions can be further expanded by imparting stimuli-responsive or "smart" behaviors by inclusion of a stimuli-responsive emulsifier, polymer or surfactant. This enables manipulation like gelation, breaking, or aggregation, by external triggers such as pH, temperature, or salt concentration changes. This platform generates functional materials for pharmaceuticals, cosmetics, oil recovery, and colloid engineering, combining both smart behaviors and intrinsic benefit of emulsions. However, with increased functionality comes greater complexity. This review focuses on the use of stimuli-responsive polymers for the generation of smart emulsions, motivated by the great adaptability of polymers for this application and their efficacy as steric stabilizers. Stimuli-responsive emulsions are described according to the trigger used to provide the reader with an overview of progress in this field.
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Affiliation(s)
- Abhishek Rajbanshi
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, AL10 9AB, UK
| | - Eleanor Hilton
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Cécile A Dreiss
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - Darragh Murnane
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, AL10 9AB, UK
| | - Michael T Cook
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
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2
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Ghosh S, Ghosh S, Sharma H, Bhaskar R, Han SS, Sinha JK. Harnessing the power of biological macromolecules in hydrogels for controlled drug release in the central nervous system: A review. Int J Biol Macromol 2024; 254:127708. [PMID: 37923043 DOI: 10.1016/j.ijbiomac.2023.127708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 10/20/2023] [Accepted: 10/25/2023] [Indexed: 11/07/2023]
Abstract
Hydrogels have immense potential in revolutionizing central nervous system (CNS) drug delivery, improving outcomes for neurological disorders. They serve as promising tools for controlled drug delivery to the CNS. Available hydrogel types include natural macromolecules (e.g., chitosan, hyaluronic acid, alginate), as well as hybrid hydrogels combining natural and synthetic polymers. Each type offers distinct advantages in terms of biocompatibility, mechanical properties, and drug release kinetics. Design and engineering considerations encompass hydrogel composition, crosslinking density, porosity, and strategies for targeted drug delivery. The review emphasizes factors affecting drug release profiles, such as hydrogel properties and formulation parameters. CNS drug delivery applications of hydrogels span a wide range of therapeutics, including small molecules, proteins and peptides, and nucleic acids. However, challenges like limited biodegradability, clearance, and effective CNS delivery persist. Incorporating 3D bioprinting technology with hydrogel-based CNS drug delivery holds the promise of highly personalized and precisely controlled therapeutic interventions for neurological disorders. The review explores emerging technologies like 3D bioprinting and nanotechnology as opportunities for enhanced precision and effectiveness in hydrogel-based CNS drug delivery. Continued research, collaboration, and technological advancements are vital for translating hydrogel-based therapies into clinical practice, benefiting patients with CNS disorders. This comprehensive review article delves into hydrogels for CNS drug delivery, addressing their types, design principles, applications, challenges, and opportunities for clinical translation.
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Affiliation(s)
- Shampa Ghosh
- GloNeuro, Sector 107, Vishwakarma Road, Noida, Uttar Pradesh 201301, India; ICMR - National Institute of Nutrition, Tarnaka, Hyderabad, Telangana 500007, India
| | - Soumya Ghosh
- GloNeuro, Sector 107, Vishwakarma Road, Noida, Uttar Pradesh 201301, India
| | - Hitaishi Sharma
- GloNeuro, Sector 107, Vishwakarma Road, Noida, Uttar Pradesh 201301, India
| | - Rakesh Bhaskar
- School of Chemical Engineering, Yeungnam University, Gyeonsang 38541, Republic of Korea; Research Institute of Cell Culture, Yeungnam University, Gyeonsang 38541, Republic of Korea.
| | - Sung Soo Han
- School of Chemical Engineering, Yeungnam University, Gyeonsang 38541, Republic of Korea; Research Institute of Cell Culture, Yeungnam University, Gyeonsang 38541, Republic of Korea.
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3
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Rajbanshi A, da Silva MA, Murnane D, Porcar L, Dreiss CA, Cook MT. Polymer architecture dictates thermoreversible gelation in engineered emulsions stabilised with branched copolymer surfactants. Polym Chem 2022. [DOI: 10.1039/d2py00876a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymer architecture allows control of thermoreversible gelation in branched copolymer-stabilised emulsions.
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Affiliation(s)
- A. Rajbanshi
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - M. A. da Silva
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - D. Murnane
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
| | - L. Porcar
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - C. A. Dreiss
- Institute of Pharmaceutical Science, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London, SE1 9NH, UK
| | - M. T. Cook
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, Hertfordshire, AL10 9AB, UK
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Design of Biopolymer-Based Interstitial Therapies for the Treatment of Glioblastoma. Int J Mol Sci 2021; 22:ijms222313160. [PMID: 34884965 PMCID: PMC8658694 DOI: 10.3390/ijms222313160] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 12/31/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most common form of primary brain cancer and has the highest morbidity rate and current treatments result in a bleak 5-year survival rate of 5.6%. Interstitial therapy is one option to increase survival. Drug delivery by interstitial therapy most commonly makes use of a polymer implant encapsulating a drug which releases as the polymer degrades. Interstitial therapy has been extensively studied as a treatment option for GBM as it provides several advantages over systemic administration of chemotherapeutics. Primarily, it can be applied behind the blood–brain barrier, increasing the number of possible chemotherapeutic candidates that can be used and reducing systemic levels of the therapy while concentrating it near the cancer source. With interstitial therapy, multiple drugs can be released locally into the brain at the site of resection as the polymer of the implant degrades, and the release profile of these drugs can be tailored to optimize combination therapy or maintain synergistic ratios. This can bypass the blood–brain barrier, alleviate systemic toxicity, and resolve drug resistance in the tumor. However, tailoring drug release requires appropriate consideration of the complex relationship between the drug, polymer, and formulation method. Drug physicochemical properties can result in intermolecular bonding with the polymeric matrix and affect drug distribution in the implant depending on the formulation method used. This review is focused on current works that have applied interstitial therapy towards GBM, discusses polymer and formulation methods, and provides design considerations for future implantable biodegradable materials.
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Erthal LCS, Gobbo OL, Ruiz-Hernandez E. Biocompatible copolymer formulations to treat glioblastoma multiforme. Acta Biomater 2021; 121:89-102. [PMID: 33227487 DOI: 10.1016/j.actbio.2020.11.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 11/12/2020] [Accepted: 11/17/2020] [Indexed: 12/20/2022]
Abstract
The treatment for glioblastoma multiforme (GBM) has not changed for more than 20 years while the prognosis for the patients is still poor and most of them survive less than 1 year after diagnosis. The standard of care for GBM is comprised of surgical resection followed by radiotherapy and oral chemotherapy with temozolomide. The placement of carmustine wafers in the brain after tumour removal is added in cases of recurrent glioma. Significant research is underway to improve the GBM therapy outcome and patient quality of life. Biomaterials are in the front line of the research focus for new treatment options. Specially, biocompatible polymers have been proposed in hydrogel-based formulations aiming at injectable and localized therapies. These formulations can comprise many different pharmacological agents such as chemotherapeutic drugs, nanoparticles, cells, nucleic acids, and diagnostic agents. In this manuscript, we review the most recent formulations developed and tested both in vitro and in vivo using different types of hydrogels. Firstly, we describe three common types of thermo-responsive polymers addressing the advantages and drawbacks of their formulations. Then, we focus on formulations specifically developed for GBM treatment.
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Affiliation(s)
- Luiza C S Erthal
- School of Pharmacy and Pharmaceutical Sciences & Trinity St. James's Cancer Institute, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences & Trinity St. James's Cancer Institute, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Eduardo Ruiz-Hernandez
- School of Pharmacy and Pharmaceutical Sciences & Trinity St. James's Cancer Institute, Trinity College Dublin, College Green, Dublin 2, Ireland.
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Bellotti E, Schilling AL, Little SR, Decuzzi P. Injectable thermoresponsive hydrogels as drug delivery system for the treatment of central nervous system disorders: A review. J Control Release 2021; 329:16-35. [PMID: 33259851 DOI: 10.1016/j.jconrel.2020.11.049] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/24/2020] [Accepted: 11/24/2020] [Indexed: 12/13/2022]
Abstract
The central nervous system (CNS), consisting of the brain, spinal cord, and retina, superintends to the acquisition, integration and processing of peripheral information to properly coordinate the activities of the whole body. Neurodegenerative and neurodevelopmental disorders, trauma, stroke, and brain tumors can dramatically affect CNS functions resulting in serious and life-long disabilities. Globally, the societal and economic burden associated with CNS disorders continues to grow with the ageing of the population thus demanding for more effective and definitive treatments. Despite the variety of clinically available therapeutic molecules, medical interventions on CNS disorders are mostly limited to treat symptoms rather than halting or reversing disease progression. This is attributed to the complexity of the underlying disease mechanisms as well as to the unique biological microenvironment. Given its central importance, multiple barriers, including the blood brain barrier and the blood cerebrospinal fluid barrier, protect the CNS from external agents. This limits the access of drug molecules to the CNS thus contributing to the modest therapeutic successes. Loco-regional therapies based on the deposition of thermoresponsive hydrogels loaded with therapeutic agents and cells are receiving much attention as an alternative and potentially more effective approach to manage CNS disorders. In this work, the current understanding and challenges in the design of thermoresponsive hydrogels for CNS therapy are reviewed. First, the biological barriers that hinder mass and drug transport to the CNS are described, highlighting the distinct features of each barrier. Then, the realization, characterization and biomedical application of natural and synthetic thermoresponsive hydrogels are critically presented. Advantages and limitations of each design and application are discussed with the objective of identifying general rules that could enhance the effective translation of thermoresponsive hydrogel-based therapies for the treatment of CNS disorders.
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Affiliation(s)
- Elena Bellotti
- Laboratory of Nanotechnology for Precision Medicine, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.
| | - Andrea L Schilling
- Department of Chemical Engineering, University of Pittsburgh, 427 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA
| | - Steven R Little
- Department of Chemical Engineering, University of Pittsburgh, 427 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, USA; Department of Bioengineering, University of Pittsburgh, 302 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15216, USA; Department of Clinical and Translational Science, University of Pittsburgh, Forbes tower, Suite 7057, Pittsburgh, PA 15213, USA; McGowan Institute of Regenerative Medicine, University of Pittsburgh, 450 Technology Drive, Suite 300, Pittsburgh, PA, 15219, USA; Department of Immunology, University of Pittsburgh, 200 Lothrop Street, Pittsburgh, PA, 15213, USA; Department of Pharmaceutical Science, University of Pittsburgh, 3501 Terrace Street, Pittsburgh, PA, 15213, USA
| | - Paolo Decuzzi
- Laboratory of Nanotechnology for Precision Medicine, Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
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Moody CT, Palvai S, Brudno Y. Click cross-linking improves retention and targeting of refillable alginate depots. Acta Biomater 2020; 112:112-121. [PMID: 32497743 PMCID: PMC7365769 DOI: 10.1016/j.actbio.2020.05.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 05/23/2020] [Accepted: 05/26/2020] [Indexed: 12/13/2022]
Abstract
Injectable alginate hydrogels have demonstrated utility in tissue engineering and drug delivery applications due in part to their mild gelation conditions, low host responses and chemical versatility. Recently, the potential of these gels has expanded with the introduction of refillable hydrogel depots - alginate gels chemically decorated with click chemistry groups to efficiently capture prodrug refills from the blood. Unfortunately, high degrees of click group substitution on alginate lead to poor viscoelastic properties and loss of ionic cross-linking. In this work, we introduce tetrabicyclononyne (tBCN) agents that covalently cross-link azide-modified alginate hydrogels for tissue engineering and drug delivery application in vivo. Adjusting cross-linker concentration allowed tuning the hydrogel mechanical properties for tissue-specific mechanical strength. The bioorthogonal and specific click reaction creates stable hydrogels with improved in vivo properties, including improved retention at injected sites. Azide-alginate hydrogels cross-linked with tBCN elicited minimal inflammation and maintained structural integrity over several months and efficiently captured therapeutics drug surrogates from the circulation. Taken together, azide-alginate hydrogels cross-linked with tBCN convey the benefits of alginate hydrogels for use in tissue engineering and drug delivery applications of refillable drug delivery depots. STATEMENT OF SIGNIFICANCE: Ionically cross-linked, injectable alginate biomaterials hold promise in many different clinical settings. However, adding new chemical functionality to alginate can disrupt their ionic cross-linking, limiting their utility. We have developed a "click" cross-linking strategy to improve the mechanical properties and tissue function of modified alginate biomaterials and enable them to capture small molecule drugs from the blood. We show that click cross-linked materials remain in place better than ionically cross-linked materials and efficiently capture payloads from the blood. Development of click cross-linking for refillable depots represents a crucial step toward clinical application of this promising drug delivery platform.
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Affiliation(s)
- Christopher T Moody
- Joint Department of Biomedical Engineering, University of North Carolina - Chapel Hill and North Carolina State University - Raleigh, 1840 Entrepreneur Drive, Raleigh, NC 27695, USA
| | - Sandeep Palvai
- Joint Department of Biomedical Engineering, University of North Carolina - Chapel Hill and North Carolina State University - Raleigh, 1840 Entrepreneur Drive, Raleigh, NC 27695, USA
| | - Yevgeny Brudno
- Joint Department of Biomedical Engineering, University of North Carolina - Chapel Hill and North Carolina State University - Raleigh, 1840 Entrepreneur Drive, Raleigh, NC 27695, USA.
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8
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Duwa R, Emami F, Lee S, Jeong JH, Yook S. Polymeric and lipid-based drug delivery systems for treatment of glioblastoma multiforme. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.06.050] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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9
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Tabet A, Jensen MP, Parkins CC, Patil PG, Watts C, Scherman OA. Designing Next-Generation Local Drug Delivery Vehicles for Glioblastoma Adjuvant Chemotherapy: Lessons from the Clinic. Adv Healthc Mater 2019; 8:e1801391. [PMID: 30632715 DOI: 10.1002/adhm.201801391] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/03/2018] [Indexed: 12/11/2022]
Abstract
To date, the clinical outcomes and survival rates for patients with glioblastoma (GB) remain poor. A promising approach to disease-modification involves local delivery of adjuvant chemotherapy into the resection cavity, thus circumventing the restrictions imposed by the blood-brain barrier. The clinical performance of the only FDA-approved local therapy for GB [carmustine (BCNU)-loaded polyanhydride wafers], however, has been disappointing. There is an unmet medical need in the local treatment of GB for drug delivery vehicles that provide sustained local release of small molecules and combination drugs over several months. Herein, key quantitative lessons from the use of local and systemic adjuvant chemotherapy for GB in the clinic are outlined, and it is discussed how these can inform the development of next-generation therapies. Several recent approaches are highlighted, and it is proposed that long-lasting soft materials can capture the value of stiff BCNU-loaded wafers while addressing a number of unmet medical needs. Finally, it is suggested that improved communication between materials scientists, biomedical scientists, and clinicians may facilitate translation of these materials into the clinic and ultimately lead to improved clinical outcomes.
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Affiliation(s)
- Anthony Tabet
- Melville Laboratory for Polymer Synthesis; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Melanie P. Jensen
- Division of Neurosurgery; Department of Clinical Neurosciences; Addenbrooke's Hospital; University of Cambridge; Hills Road Cambridge CB2 0QQ UK
| | - Christopher C. Parkins
- Melville Laboratory for Polymer Synthesis; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Parag G. Patil
- Department of Neurosurgery; University of Michigan Medical School; Ann Arbor MI 48109 USA
| | - Colin Watts
- Division of Neurosurgery; Department of Clinical Neurosciences; Addenbrooke's Hospital; University of Cambridge; Hills Road Cambridge CB2 0QQ UK
- Department of Neurosurgery; Birmingham Brain Cancer Program; Institute of Cancer and Genomic Sciences; University of Birmingham; Birmingham B15 2TT UK
| | - Oren A. Scherman
- Melville Laboratory for Polymer Synthesis; Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
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Yu F, Asghar S, Zhang M, Zhang J, Ping Q, Xiao Y. Local strategies and delivery systems for the treatment of malignant gliomas. J Drug Target 2018; 27:367-378. [PMID: 30101621 DOI: 10.1080/1061186x.2018.1509982] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Glioma is one of the most common type of malignant tumours with high morbidity and mortality rates. Due to the particular features of the brain, such as blood-brain barrier or blood-tumour barrier, therapeutic agents are ineffective by systemic administration. The tumour inevitably recurs and devitalises patients. Herein, an overview of the localised gliomas treatment strategies is provided, including direct intratumoural/intracerebral injection, convection-enhanced delivery, and the implant of biodegradable polymer systems. The advantages and disadvantages of each therapy are discussed. Subsequently, we have reviewed the recent developments of therapeutic delivery systems aimed at transporting sufficient amounts of antineoplastic drugs into the brain tumour sites while minimising the potential side effects. To treat gliomas, localised and controlled delivery of drugs at their desired site of action is preferred as it reduces toxicity and increases treatment efficiency. Simultaneously, various drug delivery systems (DDS) have been used to enhance drug delivery to the brain. Use of non-conventional DDS for localised therapy has greatly expanded the spectrum of drugs available for the treatment of malignant tumours. Use smart DDS via localised delivery strategies, in combination with radiotherapy and multiple drug loading would serve as a promising approach to treat gliomas.
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Affiliation(s)
- Feng Yu
- a Department of Pharmaceutics, State Key Laboratory of Natural Medicines , China Pharmaceutical University , Nanjing , People's Republic of China
| | - Sajid Asghar
- b Faculty of Pharmaceutical Sciences , Government College University Faisalabad , Faisalabad , Pakistan
| | - Mei Zhang
- a Department of Pharmaceutics, State Key Laboratory of Natural Medicines , China Pharmaceutical University , Nanjing , People's Republic of China
| | - Jingwei Zhang
- a Department of Pharmaceutics, State Key Laboratory of Natural Medicines , China Pharmaceutical University , Nanjing , People's Republic of China
| | - Qineng Ping
- a Department of Pharmaceutics, State Key Laboratory of Natural Medicines , China Pharmaceutical University , Nanjing , People's Republic of China
| | - Yanyu Xiao
- a Department of Pharmaceutics, State Key Laboratory of Natural Medicines , China Pharmaceutical University , Nanjing , People's Republic of China
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11
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Rowland MJ, Parkins CC, McAbee JH, Kolb AK, Hein R, Loh XJ, Watts C, Scherman OA. An adherent tissue-inspired hydrogel delivery vehicle utilised in primary human glioma models. Biomaterials 2018; 179:199-208. [PMID: 30037456 DOI: 10.1016/j.biomaterials.2018.05.054] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 05/29/2018] [Accepted: 05/29/2018] [Indexed: 11/17/2022]
Abstract
A physical hydrogel cross-linked via the host-guest interactions of cucurbit[8]uril and utilised as an implantable drug-delivery vehicle for the brain is described herein. Constructed from hyaluronic acid, this hydrogel is biocompatible and has a high water content of 98%. The mechanical properties have been characterised by rheology and compared with the modulus of human brain tissue demonstrating the production of a soft material that can be moulded into the cavity it is implanted into following surgical resection. Furthermore, effective delivery of therapeutic compounds and antibodies to primary human glioblastoma cell lines is showcased by a variety of in vitro and ex vivo viability and immunocytochemistry based assays.
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Affiliation(s)
- Matthew J Rowland
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Christopher C Parkins
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Joseph H McAbee
- Department of Clinical Neurosciences, Cambridge Centre for Brain Repair, University of Cambridge, Cambridge, CB2 0PY, UK
| | - Anna K Kolb
- Department of Clinical Neurosciences, Cambridge Centre for Brain Repair, University of Cambridge, Cambridge, CB2 0PY, UK
| | - Robert Hein
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Innovis, Singapore
| | - Colin Watts
- Department of Clinical Neurosciences, Cambridge Centre for Brain Repair, University of Cambridge, Cambridge, CB2 0PY, UK; Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Addenbrooke's Hospital, Cambridge, CB2 0QQ, UK
| | - Oren A Scherman
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK.
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12
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Hyun H, Park MH, Lim W, Kim SY, Jo D, Jung JS, Jo G, Um S, Lee DW, Yang DH. Injectable visible light-cured glycol chitosan hydrogels with controlled release of anticancer drugs for local cancer therapy in vivo: a feasible study. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2018; 46:874-882. [DOI: 10.1080/21691401.2018.1470529] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Hoon Hyun
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Min Ho Park
- Department of Surgery, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Wonbong Lim
- Department of Premedical Program, School of Medicine, Chosun University, Gwangju, Republic of Korea
| | - So Yeon Kim
- Department of Dental Hygiene, College of Health Sciences, Cheongju University, Cheongju, Republic of Korea
| | - Danbi Jo
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Jin Seok Jung
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Gayoung Jo
- Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - Sewook Um
- Department of Veterinary Surgery, College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Deok-Won Lee
- Department of Oral and Maxillofacial Surgery, Kyung Hee University Dental Hospital at Gangdong, Kyung Hee University, Seoul, Republic of Korea
| | - Dae Hyeok Yang
- Institute of Cell and Tissue Engineering, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Alfurhood JA, Sun H, Kabb CP, Tucker BS, Matthews JH, Luesch H, Sumerlin BS. Poly( N-(2-Hydroxypropyl) Methacrylamide)-Valproic Acid Conjugates as Block Copolymer Nanocarriers. Polym Chem 2017; 8:4983-4987. [PMID: 28959359 PMCID: PMC5612619 DOI: 10.1039/c7py00196g] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We report nanoassemblies based on block copolymers of N-(2-hydroxypropyl) methacrylamide (HPMA) in which drug cleavage enhances the biological compatibility of the original polymer carrier by regeneration of HPMA units. Drug release via ester hydrolysis suggests this approach offers potential for stimuli-responsive drug delivery under acidic conditions.
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Affiliation(s)
- Jawaher A Alfurhood
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611-7200, USA
| | - Hao Sun
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611-7200, USA
| | - Christopher P Kabb
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611-7200, USA
| | - Bryan S Tucker
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611-7200, USA
| | - James H Matthews
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610-7200, USA
| | - Hendrik Luesch
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610-7200, USA
| | - Brent S Sumerlin
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL 32611-7200, USA
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14
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Anticancer drug-loaded hydrogels as drug delivery systems for the local treatment of glioblastoma. J Control Release 2016; 243:29-42. [DOI: 10.1016/j.jconrel.2016.09.034] [Citation(s) in RCA: 144] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 09/15/2016] [Accepted: 09/25/2016] [Indexed: 12/16/2022]
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Tomuleasa C, Braicu C, Irimie A, Craciun L, Berindan-Neagoe I. Nanopharmacology in translational hematology and oncology. Int J Nanomedicine 2014; 9:3465-79. [PMID: 25092977 PMCID: PMC4113407 DOI: 10.2147/ijn.s60488] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nanoparticles have displayed considerable promise for safely delivering therapeutic agents with miscellaneous therapeutic properties. Current progress in nanotechnology has put forward, in the last few years, several therapeutic strategies that could be integrated into clinical use by using constructs for molecular diagnosis, disease detection, cytostatic drug delivery, and nanoscale immunotherapy. In the hope of bringing the concept of nanopharmacology toward a viable and feasible clinical reality in a cancer center, the present report attempts to present the grounds for the use of cell-free nanoscale structures for molecular therapy in experimental hematology and oncology.
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Affiliation(s)
- Ciprian Tomuleasa
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Hematology, Ion Chiricuta Cancer Center, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Cornelia Braicu
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Alexandra Irimie
- Department of Prosthetic Dentistry and Dental Materials, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Lucian Craciun
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Ioana Berindan-Neagoe
- Research Center for Functional Genomics, Biomedicine and Translational Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Immunology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania ; Department of Functional Genomics and Experimental Pathology, the Oncological Institute "Prof Dr Ion Chiricuta", Cluj-Napoca, Romania
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16
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Al-Abd AM, Al-Abbasi FA, Asaad GF, Abdel-Naim AB. Didox potentiates the cytotoxic profile of doxorubicin and protects from its cardiotoxicity. Eur J Pharmacol 2013; 718:361-9. [DOI: 10.1016/j.ejphar.2013.08.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 07/14/2013] [Accepted: 08/05/2013] [Indexed: 11/24/2022]
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17
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Ozeki T, Kaneko D, Hashizawa K, Imai Y, Tagami T, Okada H. Combination therapy of surgical tumor resection with implantation of a hydrogel containing camptothecin-loaded poly(lactic-co-glycolic acid) microspheres in a C6 rat glioma model. Biol Pharm Bull 2012; 35:545-50. [PMID: 22466559 DOI: 10.1248/bpb.35.545] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have developed a drug-loaded poly(lactic-co-glycolic acid) (PLGA) microsphere-containing thermoreversible gelation polymer (TGP) (drug/PLGA/TGP) formulation as a novel device for implantation after surgical glioma resection. TGP is a thermosensitive polymer that is a gel at body temperature and a sol at room temperature. When a drug/PLGA/TGP formulation is injected into a target site, PLGA microspheres in TGP gel localize at the injection site and do not diffuse across the entire brain tissue, and thus, sustained drug release from the PLGA microspheres at the target site is expected. Using in vivo imaging, we confirmed that the implantation of indocyanine green (ICG)/PLGA/TGP formulation exhibited a stronger localization of ICG at the injection site 28 d after injection compared with that of ICG/PLGA formulation. The therapeutic effect (mean survival) was evaluated in a C6 rat glioma model. Surgical tumor resection alone showed almost no effect on survival (controls, 18 d; surgical resection; 18.5 d). Survival was prolonged after the treatment with a camptothecin (CPT; 10 µg)/PLGA/TGP formulation (24 d). The combination treatment of surgical tumor resection and CPT/PLGA/TGP showed almost the same therapeutic effect (24 d) compared with CPT/PLGA/TGP alone, while the combination treatment produced long term survivors (>60 d). Therefore, the CPT/PLGA/TGP formulation can be an effective candidate for localized and sustained long-term glioma therapy.
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Affiliation(s)
- Tetsuya Ozeki
- Drug Delivery and Nano Pharmaceutics, Graduate School of Pharmaceutical Sciences, Nagoya City University, Aichi, Japan.
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18
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Improvement of survival in C6 rat glioma model by a sustained drug release from localized PLGA microspheres in a thermoreversible hydrogel. Int J Pharm 2012; 427:299-304. [DOI: 10.1016/j.ijpharm.2012.02.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 01/21/2012] [Accepted: 02/09/2012] [Indexed: 11/20/2022]
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19
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Cunha-Filho MSS, Alvarez-Lorenzo C, Martínez-Pacheco R, Landin M. Temperature-sensitive gels for intratumoral delivery of β-lapachone: effect of cyclodextrins and ethanol. ScientificWorldJournal 2012; 2012:126723. [PMID: 22629119 PMCID: PMC3349311 DOI: 10.1100/2012/126723] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 01/15/2012] [Indexed: 12/16/2022] Open
Abstract
This work evaluated the potential of Pluronics (varieties F127 and P123) in combination with solubilizing agents to be used as syringeable in situ gelling depots of intratumoral β-lapachone (βLAP). Pluronic dispersions prepared at various concentrations in the absence and the presence of ethanol and randomly methylated β-cyclodextrin (RMβCD) were characterized regarding their rheological properties, drug solubilization capacity, and in vitro release. Pluronic F127 (18-23%) formulations combined high ability to solubilize βLAP (enhancement solubility factor up to 50), adequate gel temperature range (over 25 °C), and gel strength at 37 °C enough to guarantee the permanence of the formulation in the administration site for a period of time. βLAP release rate was finely tuned by the concentration of the polymer and the addition of RMβCD (diffusion coefficient ranging between 9 and 69 μg · cm(-2)). The ethanol increases βLAP release rate but simultaneously led to weak gels. This paper shows that βLAP formulations involving temperature-reversible Pluronic gels may be suitable for intratumoral drug delivery purposes.
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Affiliation(s)
- Marcilio S S Cunha-Filho
- Faculdade de Ciências da Saúde, Universidade de Brasília, Campus Universitário Darcy Ribeiro, 70910-900 Brasília-DF, Brazil
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20
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Li L, Zhao M, Li W, Wang Y, Zhang Z, An R, Peng S. Self-complexation and complexation-controlled target cancer therapy. MEDCHEMCOMM 2012. [DOI: 10.1039/c2md20003a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Torres AJ, Zhu C, Shuler ML, Pannullo S. Paclitaxel delivery to brain tumors from hydrogels: A computational study. Biotechnol Prog 2011; 27:1478-87. [DOI: 10.1002/btpr.665] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 05/08/2011] [Indexed: 11/05/2022]
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22
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Osanai T, Kuroda S, Yasuda H, Chiba Y, Maruichi K, Hokari M, Sugiyama T, Shichinohe H, Iwasaki Y. Noninvasive Transplantation of Bone Marrow Stromal Cells for Ischemic Stroke: Preliminary Study With a Thermoreversible Gelation Polymer Hydrogel. Neurosurgery 2010; 66:1140-7; discussion 1147. [DOI: 10.1227/01.neu.0000369610.76181.cf] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Toshiya Osanai
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Satoshi Kuroda
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Hiroshi Yasuda
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Yasuhiro Chiba
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Katsuhiko Maruichi
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masaaki Hokari
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Taku Sugiyama
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Hideo Shichinohe
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Yoshinobu Iwasaki
- Department of Neurosurgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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Kataoka K, Huh N. Application of a thermo-reversible gelation polymer, mebiol gel, for stem cell culture and regenerative medicine. J Stem Cells Regen Med 2010. [PMID: 24693055 PMCID: PMC3908250 DOI: 10.46582/jsrm.0601003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recent studies have revealed the possible utility of a three-dimensional culture system using a thermo-reversible gelation polymer, Mebiol Gel. It is a purely synthesized biocompatible copolymer composed of thermoresponsive polymer blocks [poly(N-isopropylacrylamide-co-n-butyl methacrylate) poly(NIPAAm-co-BMA)] and hydrophilic polymer blocks (polyethylene glycol [PEG]). Mebiol Gel is characterized by its temperature-dependent dynamic visccoelastic properties. Mebiol Gel is used as a biocompatible scaffold for three-dimensional culture without any toxicity. Representative biological scaffolds for three-dimensional culture, i.e. type I collagen and Matrigel, interact with cells and affect cellular functions, but Mebiol Gel hardly showed such effects. Because of its innertness, Mebiol Gel enables clonal expansion of single stem cells. Application of Mebiol Gel to tissue defects in animal models revealed that Mebiol Gel enhanced tissue regeneration with activation of stem cells and prevention of inflammation. Thus, Mebiol Gel is suitable for preparation of cells for transplantation and is useful for direct application to promote regeneration of damaged tissues in vivo.
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Affiliation(s)
- K Kataoka
- Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Kita-ku, Okayama, Japan
| | - N Huh
- Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Kita-ku, Okayama, Japan
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24
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Pharmacokinetics of doxorubicin after intratumoral injection using a thermosensitive hydrogel in tumor-bearing mice. J Control Release 2010; 142:101-7. [DOI: 10.1016/j.jconrel.2009.10.003] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Revised: 09/07/2009] [Accepted: 10/03/2009] [Indexed: 12/26/2022]
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Takao H, Murayama Y, Yuki I, Ishibashi T, Ebara M, Irie K, Yoshioka H, Mori Y, Vinuela F, Abe T. ENDOVASCULAR TREATMENT OF EXPERIMENTAL ANEURYSMS USING A COMBINATION OF THERMOREVERSIBLE GELATION POLYMER AND PROTECTION DEVICES. Neurosurgery 2009; 65:601-9; discussion 609. [DOI: 10.1227/01.neu.0000350929.31743.c2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Abstract
OBJECTIVE
We developed a new liquid embolic agent, an aqueous solution of thermoreversible gelation polymer (TGP) for the treatment of cerebral aneurysms. This polymer solution has the unique characteristics that allow it to solidify at a specific temperature without solvent. We performed an experimental aneurysm embolization using this liquid embolic agent with and without different protective devices to evaluate its technical feasibility for the treatment of aneurysms.
METHODS
Fourteen side-wall aneurysms were surgically constructed on 14 common carotid arteries of 7 swine. Embolizations were conducted in combination with balloon protection (balloon group, n = 4), microstent protection (stent group, n = 4), and microcoil and microstent protection (stent-coil group, n = 4). Two aneurysms were used as controls. One control aneurysm was not embolized, and the other received control stent placement only. Angiographic follow-up was performed on day 14 and was followed by histopathological evaluation.
RESULTS
Successful TGP solution delivery was conducted in all cases. Complete aneurysm occlusion was achieved in all cases without TGP migration. Follow-up angiograms demonstrated complete occlusion in the stent and stent-coil groups. A small recurrence was observed in the balloon group. Histopathological findings demonstrated neoendothelialization across the necks of the aneurysms.
CONCLUSION
Experimental aneurysms were safely embolized using TGP. Further modifications related to mechanical stability and long-term safety evaluation results are necessary before clinical application.
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Affiliation(s)
- Hiroyuki Takao
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
| | - Yuichi Murayama
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
| | - Ichiro Yuki
- Department of Radiological Science, Division of Interventional Neuroradiology, UCLA School of Medicine and Medical Center, Los Angeles, California
| | - Toshihiro Ishibashi
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
| | - Masaki Ebara
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
| | - Koreaki Irie
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
| | - Hiroshi Yoshioka
- Advanced Research Center for Science and Engineering, Waseda University, Tokyo, Japan
| | - Yuichi Mori
- Advanced Research Center for Science and Engineering, Waseda University, Tokyo, Japan
| | - Fernando Vinuela
- Department of Radiological Science, Division of Interventional Neuroradiology, UCLA School of Medicine and Medical Center, Los Angeles, California
| | - Toshiaki Abe
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan
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Chen LC, Liu YC, Liang YC, Ho YS, Lee WS. Magnolol inhibits human glioblastoma cell proliferation through upregulation of p21/Cip1. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:7331-7337. [PMID: 19645506 DOI: 10.1021/jf901477g] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Previously, we demonstrated that magnolol isolated from the bark of Magnolia officinalis has anticancer activity in colon, hepatoma, and leukemia cell lines. In this study, we show that magnolol concentration dependently (0-40 microM) decreased the cell number in a cultured human glioblastoma cancer cell line (U373) and arrested the cells at the G0/G1 phase of the cell cycle. Magnolol treatment decreased the protein levels of cyclins A and D1 and increased p21/Cip1, but not cyclins B and D3, cyclin-dependent kinase (CDK)2, CDK4, CDC25C, Weel, p27/Kip1, and p53. The CDK2-p21/Cip1 complex was increased, and the CDK2 kinase activity was decreased in the magnolol-treated U373. Pretreatment of U373 with p21/Cip1 specific antisense oligodeoxynucleotide prevented the magnolol-induced increase of p21/Cip1 protein levels and the decrease of DNA synthesis. Magnolol at a concentration of 100 microM induced DNA fragmentation in U373. Our findings suggest the potential applications of magnolol in the treatment of human brain cancers.
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Affiliation(s)
- Li-Ching Chen
- Graduate Institute of Medical Sciences, School of Medicine, Taipei Medical University, Taipei, Taiwan
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Lu D, Wen X, Liang J, Gu Z, Zhang X, Fan Y. A pH-sensitive nano drug delivery system derived from pullulan/doxorubicin conjugate. J Biomed Mater Res B Appl Biomater 2009; 89:177-83. [DOI: 10.1002/jbm.b.31203] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Takao H, Murayama Y, Ebara M, Ishibashi T, Saguchi T, Irie K, Yoshioka H, Mori Y, Vinuela F, Abe T. New thermoreversible liquid embolic agent for embolotherapy: technical report. Neuroradiology 2008; 51:95-8. [PMID: 18936932 DOI: 10.1007/s00234-008-0469-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2008] [Accepted: 10/01/2008] [Indexed: 11/27/2022]
Abstract
INTRODUCTION To evaluate potential feasibility of new liquid embolic agent, thermoreversible gelation polymer (TGP), for embolotherapy. METHODS TGP is a liquid polymer that was originally developed as a cell culture medium for tissue engineering. TGP becomes liquid at temperatures lower than the sol-gel transition temperature (TT) and becomes a gel at temperatures higher than the TT. The TT can be adjusted from 10 degrees C to 40 degrees C, allowing gelation at body temperature without solvent. The renal arteries in six swine were embolized with TGP. Angiographic evaluations were obtained 0, 3 h, and 14 days after embolization. The animals were sacrificed at day 14 after angiogram. RESULTS All renal arteries were successfully embolized with TGP using cooling catheter. No acute and chronic clinical complication was observed. Follow-up angiogram demonstrated complete or near complete occlusion of renal arteries. No untoward inflammatory response was observed in acute and chronic specimen. CONCLUSION This embolic material has potential feasibility to be used in the treatment of cerebral arteriovenous malformations, aneurysms, or hyper vascular tumors.
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Affiliation(s)
- Hiroyuki Takao
- Division of Endovascular Neurosurgery, Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan.
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Ta HT, Dass CR, Dunstan DE. Injectable chitosan hydrogels for localised cancer therapy. J Control Release 2008; 126:205-16. [DOI: 10.1016/j.jconrel.2007.11.018] [Citation(s) in RCA: 184] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Accepted: 11/26/2007] [Indexed: 01/15/2023]
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