1
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Hannon G, Bogdanska A, Keogh A, Finn SP, Gobbo OL, Prina-Mello A. Biodistribution and histological analysis of iron oxide-dextran nanoparticles in wistar rats. Nanotoxicology 2023; 17:562-580. [PMID: 37982374 DOI: 10.1080/17435390.2023.2276413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/11/2023] [Indexed: 11/21/2023]
Abstract
Iron oxide nanoparticles (IONP) are showing promise in many biomedical applications. One of these- magnetic hyperthermia- utilizes externally applied alternating magnetic fields and tumor-residing magnetic nanoparticles to generate localized therapeutic temperature elevations. Magnetic hyperthermia is approved in Europe to treat glioblastoma and is undergoing clinical assessment in the United States to treat prostate cancer. In this study, we performed biodistribution and histological analysis of a new IONP (RCL-01) in Wistar rats. These nanoparticles are currently undergoing clinical assessment in locally advanced pancreatic ductal adenocarcinoma to determine the feasibility of magnetic hyperthermia treatment in this disease. The study presented here aimed to determine the fate of these nanoparticles in vivo and whether this results in organ damage. Wistar rats were injected intravenously with relatively high doses of IONP (30 mgFe/kg, 45 mgFe/kg and 60 mgFe/kg) and compared to a vehicle control to determine the accumulation of iron in organs and whether this resulted in histological changes in these tissues. Dose-dependent increases of iron were observed in the liver, spleen and lungs of IONP-treated animals at 7 days postinjection; however, this did not result in significant histological changes in these tissues. Immunofluorescent imaging determined these nanoparticles are internalized by macrophages in tissue, suggesting they are readily phagocytosed by the reticuloendothelial system for eventual recycling. Notably, no changes in iron or dextran staining were found in the kidneys across all treatment groups, providing evidence for potential renal clearance.
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Affiliation(s)
- Gary Hannon
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Ireland
- Laboratory of Biological Characterization of Advanced Materials (LBCAM), Trinity Translational Medicine Institute, Trinity College Dublin, Ireland
| | - Anna Bogdanska
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Ireland
- Laboratory of Biological Characterization of Advanced Materials (LBCAM), Trinity Translational Medicine Institute, Trinity College Dublin, Ireland
| | - Anna Keogh
- Department of Histopathology, Trinity College Dublin, Ireland
| | - Stephen P Finn
- Department of Histopathology, Trinity College Dublin, Ireland
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Ireland
- Trinity St James's Cancer Institute, Ireland
| | - Adriele Prina-Mello
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Ireland
- Laboratory of Biological Characterization of Advanced Materials (LBCAM), Trinity Translational Medicine Institute, Trinity College Dublin, Ireland
- Advanced Materials and Bioengineering Research (AMBER) Centre, CRANN Institute, Trinity College Dublin, Ireland
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2
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Erthal LCS, Shi Y, Sweeney KJ, Gobbo OL, Ruiz-Hernandez E. Nanocomposite formulation for a sustained release of free drug and drug-loaded responsive nanoparticles: an approach for a local therapy of glioblastoma multiforme. Sci Rep 2023; 13:5094. [PMID: 36991081 PMCID: PMC10060267 DOI: 10.1038/s41598-023-32257-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 03/24/2023] [Indexed: 03/31/2023] Open
Abstract
Malignant gliomas are a type of primary brain tumour that originates in glial cells. Among them, glioblastoma multiforme (GBM) is the most common and the most aggressive brain tumour in adults, classified as grade IV by the World Health Organization. The standard care for GBM, known as the Stupp protocol includes surgical resection followed by oral chemotherapy with temozolomide (TMZ). This treatment option provides a median survival prognosis of only 16-18 months to patients mainly due to tumour recurrence. Therefore, enhanced treatment options are urgently needed for this disease. Here we show the development, characterization, and in vitro and in vivo evaluation of a new composite material for local therapy of GBM post-surgery. We developed responsive nanoparticles that were loaded with paclitaxel (PTX), and that showed penetration in 3D spheroids and cell internalization. These nanoparticles were found to be cytotoxic in 2D (U-87 cells) and 3D (U-87 spheroids) models of GBM. The incorporation of these nanoparticles into a hydrogel facilitates their sustained release in time. Moreover, the formulation of this hydrogel containing PTX-loaded responsive nanoparticles and free TMZ was able to delay tumour recurrence in vivo after resection surgery. Therefore, our formulation represents a promising approach to develop combined local therapies against GBM using injectable hydrogels containing nanoparticles.
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Affiliation(s)
- Luiza C S Erthal
- School of Pharmacy and Pharmaceutical Sciences and Trinity St. James's Cancer Institute, Panoz Institute, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Yang Shi
- Department of Nanomedicine and Theranostics, Institute for Experimental Molecular Imaging, RWTH Aachen University Clinic, Forckenbeckstrasse 55, 52074, Aachen, Germany
| | - Kieron J Sweeney
- National Neurosurgical Centre, Beaumont Hospital, Dublin 9, Ireland
- Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences and Trinity St. James's Cancer Institute, Panoz Institute, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Eduardo Ruiz-Hernandez
- School of Pharmacy and Pharmaceutical Sciences and Trinity St. James's Cancer Institute, Panoz Institute, Trinity College Dublin, College Green, Dublin 2, Ireland.
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3
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Stavropoulou AP, Theodosiou M, Sakellis E, Boukos N, Papanastasiou G, Wang C, Tavares A, Corral CA, Gournis D, Chalmpes N, Gobbo OL, Efthimiadou EK. Bimetallic gold-platinum nanoparticles as a drug delivery system coated with a new drug to target glioblastoma. Colloids Surf B Biointerfaces 2022; 214:112463. [PMID: 35316703 DOI: 10.1016/j.colsurfb.2022.112463] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 03/09/2022] [Accepted: 03/14/2022] [Indexed: 01/04/2023]
Abstract
A drug delivery nanosystem of noble bimetallic nanoparticles (NPs) which consists of Au NPs capped with Pt NPs (Au@Pt NPs) is constructed and functionalised with a quinazoline based small molecule (Au@Pt@Q NPs), acting as a theranostic agent against glioblastoma. Two different hydrothermal synthetic procedures for bimetallic Au@Pt NPs are presented and the resulting nanostructures are fully characterised by means of spectroscopic and microscopic methods. The imaging and targeting capacity of the new drug delivery system is assessed through fluorescent optical microscopy and cytotoxicity evaluations. The constructed Au@Pt NPs consist a monodispersed colloidal solution of 25 nm with photoluminescent, fluorescent and X-Ray absorption properties that confirm their diagnostic potential. Haemolysis testing demonstrated that Au@Pt NPs are biocompatible and fluorescent microscopy confirmed their entering the cells. Cytological evaluation of the NPs through MTT assay showed that they do not inhibit the proliferation of control cell line HEK293, whereas they are toxic in U87MG, U251 and D54 glioblastoma cell lines; rendering them selective targeting agents for treating glioblastoma.
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Affiliation(s)
- Anastasia P Stavropoulou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Maria Theodosiou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece
| | - Giorgos Papanastasiou
- School of Computer Science and Electronic Engineering, University of Essex, Colchester Campus, CO4 3SQ, UK; Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Chengjia Wang
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Adriana Tavares
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Carlos Alcaide Corral
- Edinburgh Imaging Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Dimitrios Gournis
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Nikolaos Chalmpes
- Department of Materials Science & Engineering, University of Ioannina, 45110 Ioannina, Greece
| | - Oliviero L Gobbo
- Trinity College Dublin, School of Pharmacy & Pharmaceutical Sciences, Dublin, Ireland
| | - Eleni K Efthimiadou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimioupolis, Zografou, Athens, Greece; Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Agia Paraskevi, Athens, Greece.
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4
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Fernández Y, Movellan J, Foradada L, Giménez V, García‐Aranda N, Mancilla S, Armiñán A, Borgos SE, Hyldbakk A, Bogdanska A, Gobbo OL, Prina‐Mello A, Ponti J, Calzolai L, Zagorodko O, Gallon E, Niño‐Pariente A, Paul A, Schwartz Jr S, Abasolo I, Vicent MJ. In Vivo Antitumor and Antimetastatic Efficacy of a Polyacetal-Based Paclitaxel Conjugate for Prostate Cancer Therapy. Adv Healthc Mater 2022; 11:e2101544. [PMID: 34706167 DOI: 10.1002/adhm.202101544] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/25/2021] [Indexed: 12/12/2022]
Abstract
Prostate cancer (PCa), one of the leading causes of cancer-related deaths, currently lacks effective treatment for advanced-stage disease. Paclitaxel (PTX) is a highly active chemotherapeutic drug and the first-line treatment for PCa; however, conventional PTX formulation causes severe hypersensitivity reactions and limits PTX use at high concentrations. In the pursuit of high molecular weight, biodegradable, and pH-responsive polymeric carriers, one conjugates PTX to a polyacetal-based nanocarrier to yield a tert-Ser-PTX polyacetal conjugate. tert-Ser-PTX conjugate provides sustained release of PTX over 2 weeks in a pH-responsive manner while also obtaining a degree of epimerization of PTX to 7-epi-PTX. Serum proteins stabilize tert-Ser-PTX, with enhanced stability in human serum versus PBS (pH 7.4). In vitro efficacy assessments in PCa cells demonstrate IC50 values above those for the free form of PTX due to the differential cell trafficking modes; however, in vivo tolerability assays demonstrate that tert-Ser-PTX significantly reduces the systemic toxicities associated with free PTX treatment. tert-Ser-PTX also effectively inhibits primary tumor growth and hematologic, lymphatic, and coelomic dissemination, as confirmed by in vivo and ex vivo bioluminescence imaging and histopathological evaluations in mice carrying orthotopic LNCaP tumors. Overall, the results suggest the application of tert-Ser-PTX as a robust antitumor/antimetastatic treatment for PCa.
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Affiliation(s)
- Yolanda Fernández
- Functional Validation & Preclinical Research (FVPR) CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - Julie Movellan
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Laia Foradada
- Functional Validation & Preclinical Research (FVPR) CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - Vanessa Giménez
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Natalia García‐Aranda
- Functional Validation & Preclinical Research (FVPR) CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - Sandra Mancilla
- Functional Validation & Preclinical Research (FVPR) CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - Ana Armiñán
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Sven Even Borgos
- Department of Biotechnology and Nanomedicine SINTEF Industry Trondheim NO‐7465 Norway
| | - Astrid Hyldbakk
- Department of Biotechnology and Nanomedicine SINTEF Industry Trondheim NO‐7465 Norway
| | - Anna Bogdanska
- Laboratory for Biological Characterization of Advanced Materials (LBCAM) Trinity Translational Medicine Institute Trinity College Dublin Dublin D08 W9RT Ireland
- Trinity St James's Cancer Institute Trinity College Dublin the University of Dublin Dublin D08 W9RT Ireland
| | - Oliviero L. Gobbo
- Trinity St James's Cancer Institute Trinity College Dublin the University of Dublin Dublin D08 W9RT Ireland
- School of Pharmacy and Pharmaceutical Sciences Trinity College Dublin Dublin D02 R590 Ireland
| | - Adriele Prina‐Mello
- Laboratory for Biological Characterization of Advanced Materials (LBCAM) Trinity Translational Medicine Institute Trinity College Dublin Dublin D08 W9RT Ireland
- Trinity St James's Cancer Institute Trinity College Dublin the University of Dublin Dublin D08 W9RT Ireland
| | - Jessica Ponti
- European Commission Joint Research Centre (JRC) via Fermi 2749 Ispra 21027 Italy
| | - Luigi Calzolai
- European Commission Joint Research Centre (JRC) via Fermi 2749 Ispra 21027 Italy
| | - Oleksandr Zagorodko
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Elena Gallon
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Amaya Niño‐Pariente
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
| | - Alison Paul
- School of Chemistry Cardiff University Main Building, Park Place Cardiff CF10 3AT UK
| | - Simó Schwartz Jr
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - Ibane Abasolo
- Functional Validation & Preclinical Research (FVPR) CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Drug Delivery & Targeting Group CIBBIM‐Nanomedicine Vall d'Hebron Institut de Recerca (VHIR) Universitat Autònoma de Barcelona (UAB) Barcelona 08035 Spain
- Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN) Barcelona 08035 Spain
| | - María J. Vicent
- Polymer Therapeutics Laboratory. Centro de Investigación Príncipe Felipe. Av. Eduardo Primo Yúfera 3 Valencia 46012 Spain
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5
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Bogdanska A, Gobbo OL, Volkov Y, Prina-Mello A. 3D volume segmentation and reconstruction. Supervised image classification and automated quantification of superparamagnetic iron oxide nanoparticles in histology slides for safety assessment. Nanotoxicology 2021; 15:1151-1167. [PMID: 34752713 DOI: 10.1080/17435390.2021.1991502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
This article presents an automated image-processing workflow for quantitative assessment of SPION accumulation in tissue sections stained with Prussian blue for iron detection. We utilized supervised machine learning with manually labeled features used for training the classifier. Performance of the classifier was validated by 10-fold cross-validation of obtained data and by measuring Dice and Jaccard Similarity Coefficients between manually segmented image and automated segmentation. The proposed approach provides time and cost-effective solution for quantitative imaging analysis of SPION in tissue with a precision similar to that obtained via thresholding method for stain quantification. Furthermore, we exploited the classifiers to generate segmented 3D volumes from histological slides. This enabled visualization of particles which were obscured in original 3D histology stacks. Our approach offers a powerful tool for preclinical assessment of the precise tissue-specific SPION biodistribution, which could affect both their toxicity and their efficacy as nanocarriers for medicines.
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Affiliation(s)
- Anna Bogdanska
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,Trinity St James's Cancer Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland
| | - Oliviero L Gobbo
- Trinity St James's Cancer Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, the University of Dublin, Dublin, Ireland
| | - Yuri Volkov
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,Trinity St James's Cancer Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,Laboratory of Biological Characterization of Advanced Materials (LBCAM), Trinity Translational Medicine Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland
| | - Adriele Prina-Mello
- Nanomedicine and Molecular Imaging Group, Trinity Translational Medicine Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,Trinity St James's Cancer Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland.,Laboratory of Biological Characterization of Advanced Materials (LBCAM), Trinity Translational Medicine Institute, Trinity College Dublin, the University of Dublin, Dublin, Ireland
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6
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Lynch MJ, Gobbo OL. Advances in Non-Animal Testing Approaches towards Accelerated Clinical Translation of Novel Nanotheranostic Therapeutics for Central Nervous System Disorders. Nanomaterials (Basel) 2021; 11:2632. [PMID: 34685073 PMCID: PMC8538557 DOI: 10.3390/nano11102632] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/21/2021] [Accepted: 10/01/2021] [Indexed: 12/11/2022]
Abstract
Nanotheranostics constitute a novel drug delivery system approach to improving systemic, brain-targeted delivery of diagnostic imaging agents and pharmacological moieties in one rational carrier platform. While there have been notable successes in this field, currently, the clinical translation of such delivery systems for the treatment of neurological disorders has been limited by the inadequacy of correlating in vitro and in vivo data on blood-brain barrier (BBB) permeation and biocompatibility of nanomaterials. This review aims to identify the most contemporary non-invasive approaches for BBB crossing using nanotheranostics as a novel drug delivery strategy and current non-animal-based models for assessing the safety and efficiency of such formulations. This review will also address current and future directions of select in vitro models for reducing the cumbersome and laborious mandate for testing exclusively in animals. It is hoped these non-animal-based modelling approaches will facilitate researchers in optimising promising multifunctional nanocarriers with a view to accelerating clinical testing and authorisation applications. By rational design and appropriate selection of characterised and validated models, ranging from monolayer cell cultures to organ-on-chip microfluidics, promising nanotheranostic particles with modular and rational design can be screened in high-throughput models with robust predictive power. Thus, this article serves to highlight abbreviated research and development possibilities with clinical translational relevance for developing novel nanomaterial-based neuropharmaceuticals for therapy in CNS disorders. By generating predictive data for prospective nanomedicines using validated in vitro models for supporting clinical applications in lieu of requiring extensive use of in vivo animal models that have notable limitations, it is hoped that there will be a burgeoning in the nanotherapy of CNS disorders by virtue of accelerated lead identification through screening, optimisation through rational design for brain-targeted delivery across the BBB and clinical testing and approval using fewer animals. Additionally, by using models with tissue of human origin, reproducible therapeutically relevant nanomedicine delivery and individualised therapy can be realised.
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Affiliation(s)
- Mark J. Lynch
- School of Pharmacy and Pharmaceutical Sciences, Panoz Building, Trinity College Dublin, D02 PN40 Dublin, Ireland
| | - Oliviero L. Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Panoz Building, Trinity College Dublin, D02 PN40 Dublin, Ireland
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7
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Spirou SV, Costa Lima SA, Bouziotis P, Vranješ-Djurić S, Efthimiadou EΚ, Laurenzana A, Barbosa AI, Garcia-Alonso I, Jones C, Jankovic D, Gobbo OL. Recommendations for In Vitro and In Vivo Testing of Magnetic Nanoparticle Hyperthermia Combined with Radiation Therapy. Nanomaterials (Basel) 2018; 8:E306. [PMID: 29734795 PMCID: PMC5977320 DOI: 10.3390/nano8050306] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/22/2018] [Accepted: 04/29/2018] [Indexed: 12/23/2022]
Abstract
Magnetic nanoparticle (MNP)-mediated hyperthermia (MH) coupled with radiation therapy (RT) is a novel approach that has the potential to overcome various practical difficulties encountered in cancer treatment. In this work, we present recommendations for the in vitro and in vivo testing and application of the two treatment techniques. These recommendations were developed by the members of Working Group 3 of COST Action TD 1402: Multifunctional Nanoparticles for Magnetic Hyperthermia and Indirect Radiation Therapy ("Radiomag"). The purpose of the recommendations is not to provide definitive answers and directions but, rather, to outline those tests and considerations that a researcher must address in order to perform in vitro and in vivo studies. The recommendations are divided into 5 parts: (a) in vitro evaluation of MNPs; (b) in vitro evaluation of MNP-cell interactions; (c) in vivo evaluation of the MNPs; (d) MH combined with RT; and (e) pharmacokinetic studies of MNPs. Synthesis and characterization of the MNPs, as well as RT protocols, are beyond the scope of this work.
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Affiliation(s)
- Spiridon V Spirou
- Department of Radiology, Sismanoglio General Hospital of Attica, Sismanogliou 1, Marousi 15126, Athens, Greece.
| | - Sofia A Costa Lima
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto 4050-313, Portugal.
| | - Penelope Bouziotis
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", Aghia Paraskevi, Athens 15310, Greece.
| | - Sanja Vranješ-Djurić
- "Vinča" Institute of Nuclear Sciences, University of Belgrade, Belgrade 11351, Serbia.
| | - Eleni Κ Efthimiadou
- Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou 15784, Greece.
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Agia Paraskevi Attikis, Athens 15310, Greece.
| | - Anna Laurenzana
- Department of Biomedical and Clinical Science "Mario Serio", University of Florence, 50134 Firenze, Italy.
| | - Ana Isabel Barbosa
- LAQV, REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto 4050-313, Portugal.
| | - Ignacio Garcia-Alonso
- Department of Surgery, Radiology & Ph.M. University of the Basque Country, Bilbao E48940, Spain.
| | - Carlton Jones
- NanoTherics Ltd., Studio 3, Unit 3, Silverdale Enterprise Centre Kents Lane, Newcastle under Lyme ST5 6SR, UK.
| | - Drina Jankovic
- "Vinča" Institute of Nuclear Sciences, University of Belgrade, Belgrade 11351, Serbia.
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Panoz Institute, Trinity College Dublin, D02PN40 Dublin, Ireland.
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9
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Bianchi A, Gobbo OL, Dufort S, Sancey L, Lux F, Tillement O, Coll JL, Crémillieux Y. Orotracheal manganese-enhanced MRI (MEMRI): An effective approach for lung tumor detection. NMR Biomed 2017; 30:e3790. [PMID: 28857310 DOI: 10.1002/nbm.3790] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 07/15/2017] [Accepted: 07/19/2017] [Indexed: 06/07/2023]
Abstract
Lung cancer is a primary cause of cancer deaths worldwide. Timely detection of this pathology is necessary to delay or interrupt lung cancer progression, ultimately resulting in a possible better prognosis for the patient. In this context, magnetic resonance imaging (MRI) is especially promising. Ultra-short echo time (UTE) MRI sequences, in combination with gadolinium-based contrast agents, have indeed shown to be especially adapted to the detection of lung neoplastic lesions at submillimeter precision. Manganese-enhanced MRI (MEMRI) increasingly appears to be a possible effective alternative to gadolinium-enhanced MRI. In this work, we investigated whether low-dose MEMRI can effectively target non-small-cell lung cancer in rodents, whilst minimizing the potential toxic effect of manganese. Both systemic and orotracheal administration modalities allowed the identification of tumors of submillimeter size, as confirmed by bioluminescence imaging and histology. Equivalent tumor signal enhancements and contrast-to-noise ratios were observed with orotracheal administration using 20 times lower doses compared with the more conventional systemic route. This finding is of crucial importance as it supports the observation that higher performances of contrast agents can be obtained using an orotracheal administration route when targeting lung diseases. As a consequence, lower concentrations of contrast media can be employed, reducing the dose and potential safety issues. The non-detectable accumulation of ionic manganese in the brain and liver following orotracheal administration observed in vivo is extremely encouraging with regard to the safety of the orotracheal protocol with low-dose Mn2+ administration. To our knowledge, this is the first time that a study has clearly allowed the high-precision detection of lung tumor and its contours via the synergic employment of a strongly T1 -weighted MRI UTE sequence and ionic manganese, an inexpensive contrast agent. Overall, these results support the growing interest in drug and contrast agent delivery via the airways to target and diagnose several diseases of the lungs.
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Affiliation(s)
- Andrea Bianchi
- Centre de Résonance Magnétique des Systèmes Biologiques,CNRS UMR 5536, Université Bordeaux, Bordeaux, France
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences and Institute of Neuroscience, Trinity College Dublin, Ireland
| | - Sandrine Dufort
- Nano-H S.A.S, Saint Quentin-Fallavier, France
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR 5309, Université Grenoble Alpes, Grenoble, France
| | - Lucie Sancey
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumiére Matiére, Lyon, France
| | - François Lux
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumiére Matiére, Lyon, France
| | - Olivier Tillement
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumiére Matiére, Lyon, France
| | - Jean-Luc Coll
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR 5309, Université Grenoble Alpes, Grenoble, France
| | - Yannick Crémillieux
- Centre de Résonance Magnétique des Systèmes Biologiques,CNRS UMR 5536, Université Bordeaux, Bordeaux, France
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Edge D, Shortt CM, Johns E, Gobbo OL, Markos F, Abdulla MH, Barry EF. Assessment of renal function in the anaesthetised rat following injection of superparamagnetic iron oxide nanoparticles. Can J Physiol Pharmacol 2017; 95:443-446. [PMID: 28177696 DOI: 10.1139/cjpp-2016-0405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A recent study showed that a significant fall in mean arterial pressure (MAP) occurred following intravenous injection of two novel superparamagnetic iron oxide nanoparticles (SPIONs), MF66 and OD15. To assess if this was caused by excessive glomerular clearance, the effect of both particles on renal function was studied. Experiments were performed on sodium pentobarbital anaesthetised male Wistar rats (250–350 g). Twenty-minute urine clearances were taken followed by an i.v. bolus of MF66, OD15 (2 mg·kg–1), or dH2O (0.4 mL·kg–1). MF6 or OD15 injection resulted in a significant transient drop in MAP and renal blood flow by approximately 33% and 50% (P < 0.05). The absolute excretion of sodium was significantly increased (P < 0.05) by almost 80% and 70% following OD15 and MF66, respectively. Similarly, fractional excretion of sodium was increased by almost 80% and 60% following OD15 and MF66, respectively. The glomerular filtration rate was not significantly affected, but urine flow increased nonsignificantly by approximately 50% and 66% following i.v. injection of OD15 and MF66, respectively. SPIONs produce a decrease in blood pressure and a natriuresis; however, the rate of fluid filtration in the kidney was not significantly affected.
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Affiliation(s)
- Deirdre Edge
- Department of Physiology, University College Cork, Cork, Ireland
- Department of Physiology, School of Medicine, Trinity Biomedical Sciences Institute, Dublin, Ireland
| | | | - E.J. Johns
- Department of Physiology, University College Cork, Cork, Ireland
| | - Oliviero L. Gobbo
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Dublin, Ireland
| | - Farouk Markos
- Department of Physiology, University College Cork, Cork, Ireland
| | | | - Elaine F. Barry
- Department of Physiology, University College Cork, Cork, Ireland
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Edge D, Shortt CM, Gobbo OL, Teughels S, Prina-Mello A, Volkov Y, MacEneaney P, Radomski MW, Markos F. Pharmacokinetics and bio-distribution of novel super paramagnetic iron oxide nanoparticles (SPIONs) in the anaesthetized pig. Clin Exp Pharmacol Physiol 2016; 43:319-26. [PMID: 26707795 DOI: 10.1111/1440-1681.12533] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 12/17/2015] [Accepted: 12/18/2015] [Indexed: 11/29/2022]
Abstract
Manufactured nanomaterials have a variety of medical applications, including diagnosis and targeted treatment of cancer. A series of experiments were conducted to determine the pharmacokinetic, biodistribution and biocompatibility of two novel magnetic nanoparticles (MNPs) in the anaesthetized pig. Dimercaptosuccinic acid (DMSA) coated superparamagnetic iron oxide nanoparticles (MF66-labelled 12 nm, core nominal diameter and OD15 15 nm); at 0.5, or 2.0 mg/kg) were injected intravenously. Particles induced a dose-dependent decrease in blood pressure following administration which recovered to control levels several minutes after injection. Blood samples were collected for a 5-h period and stored for determination of particle concentration using particle electron paramagnetic resonance (pEPR). Organs were harvested post-mortem for magnetic resonance imaging (MRI at 1.5 T field strength) and histology. OD15 (2.0 mg/kg) MNP had a plasma half-life of approximately 15 min. Both doses of the MF66 (0.5 and 2.0 mg/kg) MNP were below detection limits. MNP accumulation was observed primarily in the liver and spleen with MRI scans which was confirmed by histology. MRI also showed that both MNPs were present in the lungs. The results show that further modifications may be required to improve the biocompatibility of these particles for use as diagnostic and therapeutic agents.
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Affiliation(s)
- Deirdre Edge
- Department of Physiology, School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Ireland
| | | | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Dublin, Ireland
| | | | - Adriele Prina-Mello
- School of Medicine, Trinity College Dublin, Dublin, Ireland.,CRANN, Trinity College Dublin, Dublin, Ireland
| | - Yuri Volkov
- School of Medicine, Trinity College Dublin, Dublin, Ireland.,CRANN, Trinity College Dublin, Dublin, Ireland
| | | | - Marek W Radomski
- School of Pharmacy and Pharmaceutical Sciences and Trinity Biomedical Sciences Institute, Dublin, Ireland
| | - Farouk Markos
- Department of Physiology, University College Cork, Cork, Ireland
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12
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Tewes F, Gobbo OL, Ehrhardt C, Healy AM. Amorphous Calcium Carbonate Based-Microparticles for Peptide Pulmonary Delivery. ACS Appl Mater Interfaces 2016; 8:1164-1175. [PMID: 26692360 DOI: 10.1021/acsami.5b09023] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Amorphous calcium carbonate (ACC) is known to interact with proteins, for example, in biogenic ACC, to form stable amorphous phases. The control of amorphous/crystalline and inorganic/organic ratios in inhalable calcium carbonate microparticles may enable particle properties to be adapted to suit the requirements of dry powders for pulmonary delivery by oral inhalation. For example, an amorphous phase can immobilize and stabilize polypeptides in their native structure and amorphous and crystalline phases have different mechanical properties. Therefore, inhalable composite microparticles made of inorganic (i.e., calcium carbonate and calcium formate) and organic (i.e., hyaluronan (HA)) amorphous and crystalline phases were investigated for peptide and protein pulmonary aerosol delivery. The crystalline/amorphous ratio and polymorphic form of the inorganic component was altered by changing the microparticle drying rate and by changing the ammonium carbonate and HA initial concentration. The bioactivity of the model peptide, salmon calcitonin (sCT), coprocessed with alpha-1-antitrypsin (AAT), a model protein with peptidase inhibitor activity, was maintained during processing and the microparticles had excellent aerodynamic properties, making them suitable for pulmonary aerosol delivery. The bioavailability of sCT after aerosol delivery as sCT and AAT-loaded composite microparticles to rats was 4-times higher than that of sCT solution.
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Affiliation(s)
- Frederic Tewes
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin , Dublin 2, Ireland
- INSERM U 1070, Pôle Biologie-Santé, Université de Poitiers , Faculté de Médecine & Pharmacie, 1 Rue Georges Bonnet, 86022 Poitiers Cedex, France
| | - Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin , Dublin 2, Ireland
| | - Carsten Ehrhardt
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin , Dublin 2, Ireland
| | - Anne Marie Healy
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin , Dublin 2, Ireland
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Abstract
In a report from 2008, The International Agency for Research on Cancer predicted a tripled cancer incidence from 1975, projecting a possible 13-17 million cancer deaths worldwide by 2030. While new treatments are evolving and reaching approval for different cancer types, the main prevention of cancer mortality is through early diagnosis, detection and treatment of malignant cell growth. The last decades have seen a development of new imaging techniques now in widespread clinical use. The development of nano-imaging through fluorescent imaging and magnetic resonance imaging (MRI) has the potential to detect and diagnose cancer at an earlier stage than with current imaging methods. The characteristic properties of nanoparticles result in their theranostic potential allowing for simultaneous detection of and treatment of the disease. This review provides state of the art of the nanotechnological applications for cancer therapy. Furthermore, it advances a novel concept of personalized nanomedical theranostic therapy using iron oxide magnetic nanoparticles in conjunction with MRI imaging. Regulatory and industrial perspectives are also included to outline future perspectives in nanotechnological cancer research.
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Affiliation(s)
- Oliviero L. Gobbo
- 1. School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Ireland
- 2. Trinity College Institute of Neuroscience, Trinity College Dublin, Ireland
- 4. Trinity Biomedical Sciences Institute, Dublin, Ireland
| | - Kristine Sjaastad
- 3. Department of Clinical Medicine Trinity Centre for Health Science, St. James's Hospital, Dublin, Ireland
| | - Marek W. Radomski
- 1. School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Ireland
- 4. Trinity Biomedical Sciences Institute, Dublin, Ireland
- 5. Silesian Medical University and Kardio-Med Silesia, Zabrze, Poland
| | - Yuri Volkov
- 3. Department of Clinical Medicine Trinity Centre for Health Science, St. James's Hospital, Dublin, Ireland
- 6. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Ireland
| | - Adriele Prina-Mello
- 3. Department of Clinical Medicine Trinity Centre for Health Science, St. James's Hospital, Dublin, Ireland
- 6. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Ireland
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Gobbo OL, Wetterling F, Vaes P, Teughels S, Markos F, Edge D, Shortt CM, Crosbie-Staunton K, Radomski MW, Volkov Y, Prina-Mello A. Biodistribution and pharmacokinetic studies of SPION using particle electron paramagnetic resonance, MRI and ICP-MS. Nanomedicine (Lond) 2015; 10:1751-60. [DOI: 10.2217/nnm.15.22] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Aim: Superparamagnetic iron oxide nanoparticles (SPIONs) may play an important role in nanomedicine by serving as drug carriers and imaging agents. In this study, we present the biodistribution and pharmacokinetic properties of SPIONs using a new detection method, particle electron paramagnetic resonance (pEPR). Materials & methods: The pEPR technique is based on a low-field and low-frequency electron paramagnetic resonance. pEPR was compared with inductively coupled plasma mass spectrometry and MRI, in in vitro and in vivo. Results: The pEPR, inductively coupled plasma mass spectrometry and MRI results showed a good correlation between the techniques. Conclusion: The results indicate that pEPR can be used to detect SPIONs in both preclinical and clinical studies.
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Affiliation(s)
- Oliviero L Gobbo
- School of Pharmacy & Pharmaceutical Sciences, Dublin, Ireland
- Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland
| | | | | | | | - Farouk Markos
- Department of Physiology, University College Cork, Cork, Ireland
| | - Deirdre Edge
- Department of Physiology, University College Cork, Cork, Ireland
| | | | | | | | - Yuri Volkov
- School of Medicine, Dublin, Ireland
- CRANN, Trinity College Dublin, Dublin, Ireland
| | - Adriele Prina-Mello
- School of Medicine, Dublin, Ireland
- CRANN, Trinity College Dublin, Dublin, Ireland
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15
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Rouine J, Gobbo OL, Campbell M, Gigliucci V, Ogden I, McHugh Smith K, Duffy P, Behan B, Byrne D, Kelly ME, Blau CW, Kerskens CM, Harkin A. MDMA 'ecstasy' increases cerebral cortical perfusion determined by bolus-tracking arterial spin labelling (btASL) MRI. Br J Pharmacol 2015; 169:974-87. [PMID: 23517012 DOI: 10.1111/bph.12178] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Revised: 12/10/2012] [Accepted: 02/18/2013] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND PURPOSE The purpose of this study was to assess cerebral perfusion changes following systemic administration of the recreational drug 3,4-methylendioxymethamphetamine (MDMA 'ecstasy') to rats. EXPERIMENTAL APPROACH Cerebral perfusion was quantified using bolus-tracking arterial spin labelling (btASL) MRI. Rats received MDMA (20 mg·kg(-1); i.p.) and were assessed 1, 3 or 24 h later. Rats received MDMA (5 or 20 mg·kg(-1); i.p.) and were assessed 3 h later. In addition, rats received MDMA (5 or 10 mg·kg(-1); i.p.) or saline four times daily over 2 consecutive days and were assessed 8 weeks later. Perfusion-weighted images were generated in a 7 tesla (7T) MRI scanner and experimental data was fitted to a quantitative model of cerebral perfusion to generate mean transit time (MTT), capillary transit time (CTT) and signal amplitude. KEY RESULTS MDMA reduces MTT and CTT and increases amplitude in somatosensory and motor cortex 1 and 3 h following administration, indicative of an increase in perfusion. Prior exposure to MDMA provoked a long-term reduction in cortical 5-HT concentration, but did not produce a sustained effect on cerebral cortical perfusion. The response to acute MDMA challenge (20 mg·kg(-1); i.p.) was attenuated in these animals indicating adaptation in response to prior MDMA exposure. CONCLUSIONS AND IMPLICATIONS MDMA provokes changes in cortical perfusion, which are quantifiable by btASL MRI, a neuroimaging tool with translational potential. Future studies are directed towards elucidation of the mechanisms involved and correlating changes in cerebrovascular function with potential behavioural deficits associated with drug use.
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Affiliation(s)
- J Rouine
- Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland
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Swaminathan J, Gobbo OL, Tewes F, Healy AM, Ehrhardt C. Encapsulation into PEG-Liposomes Does Not Improve the Bioavailability of Pulmonary Delivered Salmon Calcitonin. J Aerosol Med Pulm Drug Deliv 2014; 27:1-11. [DOI: 10.1089/jamp.2013.1049] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Janani Swaminathan
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
| | - Oliviero L. Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
- Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
| | - Frederic Tewes
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
- INSERM U 1070, Pôle Biologie-Santé, Faculté de Médecine & Pharmacie, Université de Poitiers, 86000 Poitiers, France
| | - Anne Marie Healy
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
| | - Carsten Ehrhardt
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Panoz Institute, Dublin 2, Ireland
- Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
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Gobbo OL, Zurek M, Tewes F, Ehrhardt C, Crémillieux Y. Manganese: a new contrast agent for lung imaging? Contrast Media Mol Imaging 2013; 7:542-6. [PMID: 22991321 DOI: 10.1002/cmmi.1483] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Lung parenchyma remains one of the most difficult tissues to be imaged by means of magnetic resonance imaging (MRI). Several MRI techniques are routinely used for lung imaging. However, manganese-enhancement MRI (MEMRI) technique has not been associated with pulmonary MRI. Here, we evaluated T(1) -enhancement in the rat lung after a manganese instillation, using a 4.7 T magnet with a radial ultrashort echo time sequence. Our data showed that the signal intensity was increased in lungs receiving a manganese solution compared with a control solution to the lungs. MR signal enhancements above 30% were measured in lung parenchyma following 200 µl instillation of a 1 mm manganese chloride solution. MEMRI, therefore, may be a useful novel tool for enhancing signal intensity and image contrast in lung tissue.
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Affiliation(s)
- Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin, Ireland
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18
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Gaspar MM, Radomska A, Gobbo OL, Bakowsky U, Radomski MW, Ehrhardt C. Targeted delivery of transferrin-conjugated liposomes to an orthotopic model of lung cancer in nude rats. J Aerosol Med Pulm Drug Deliv 2012; 25:310-8. [PMID: 22857016 DOI: 10.1089/jamp.2011.0928] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Lung cancer is the leading cause of cancer death worldwide. Pulmonary anticancer therapy might offer several advantages over systemic delivery, leading to an increased exposure of the lung tumor to the drug, while minimizing side effects, due to regional containment. Here, we studied if a combination of inhalation therapy and drug targeting holds potential as an even more efficient lung cancer therapy. METHODS Transferrin (Tf )-conjugated PEG liposomes loaded with doxorubicin (DOX) were administered using an intracorporeal nebulizing catheter to an orthotopic lung cancer model established in athymic Rowett nude rats. Different DOX formulations and doses (0.2 and 0.4 mg/kg) were tested and the influence on tumor progression and life span of rats was evaluated in comparison with the i.v. administration of Tf-PEG-liposomes loaded with DOX at a therapeutic dose of 2 mg/kg. RESULTS Rats in the untreated control group showed significant weight loss 2 weeks after tumor induction and died between days 19 and 29. Lungs of these animals showed multiple foci of neoplastic deposits, ranging up to 20 mm replacing the entire lobe. Empty Tf-liposomes showed a significant effect on survival time. This might be caused by the secondary cytotoxicity via stimulation of pulmonary macrophages. All animal treated intravenously also perished before the end of the study. No significant (p<0.05) improvement in survival was observed between the groups treated with aerosols of free drug, DOX encapsulated in plain and in Tf-modified liposomes. However, more animals survived in the Tf-liposome groups than in the other treatment regimes, and their lung tissue generally had fewer and smaller tumors. Nevertheless, the size of the groups, and the duration of the trial render it impossible to come to a definite conclusion. CONCLUSIONS Drug targeting demonstrated potential for improving the aerosol treatment of lung cancer.
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Affiliation(s)
- Maria Manuela Gaspar
- School of Pharmacy and Pharmaceutical Sciences, Trinity College Dublin, Dublin, Ireland
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Campbell M, Hanrahan F, Gobbo OL, Kelly ME, Kiang AS, Humphries MM, Nguyen AT, Ozaki E, Keaney J, Blau CW, Kerskens CM, Cahalan SD, Callanan JJ, Wallace E, Grant GA, Doherty CP, Humphries P. Targeted suppression of claudin-5 decreases cerebral oedema and improves cognitive outcome following traumatic brain injury. Nat Commun 2012; 3:849. [DOI: 10.1038/ncomms1852] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 04/18/2012] [Indexed: 02/04/2023] Open
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Gobbo OL, Petit F, Gurden H, Dhenain M. In vivo detection of excitotoxicity by manganese-enhanced MRI: comparison with physiological stimulation. Magn Reson Med 2011; 68:234-40. [PMID: 22127903 DOI: 10.1002/mrm.23210] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2011] [Revised: 07/27/2011] [Accepted: 08/17/2011] [Indexed: 11/11/2022]
Abstract
Manganese-enhanced MRI (MEMRI) is a powerful technique for the in vivo monitoring of brain function in animals. Manganese enters into cells through calcium channels, i.e., voltage-gated calcium channels and activated glutamate receptors (e.g., N-methyl-D-aspartate receptors). N-methyl-D-aspartate receptors are activated both in normal physiological and pathophysiological conditions. Consistent with these mechanisms, we showed that in the olfactory bulb, the MEMRI signal strongly increases when excitotoxic mechanisms are induced by an administration of a N-methyl-D-aspartate receptor agonist, quinolinate. We found that the intensity of the MEMRI signal in excitotoxic conditions is similar to the odor-evoked signal in normal physiological conditions. Finally, we showed that the dynamics of the MEMRI signal are determined by the early phase of manganese in the olfactory bulb. Overall, these data show that, in addition to physiological studies, MEMRI can be used as an in vivo method to follow-up the dynamics of excitotoxic events.
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Affiliation(s)
- Oliviero L Gobbo
- School of Pharmacy and Pharmaceutical Sciences, and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin 2, Ireland
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Tewes F, Gobbo OL, Amaro MI, Tajber L, Corrigan OI, Ehrhardt C, Healy AM. Evaluation of HPβCD-PEG microparticles for salmon calcitonin administration via pulmonary delivery. Mol Pharm 2011; 8:1887-98. [PMID: 21882837 DOI: 10.1021/mp200231c] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For therapeutic peptides, the lung represents an attractive, noninvasive route into the bloodstream. To achieve optimal bioavailability and control their fast rate of absorption, peptides can be protected by coprocessing with polymers such as polyethylene glycol (PEG). Here, we formulated and characterized salmon calcitonin (sCT)-loaded microparticles using linear or branched PEG (L-PEG or B-PEG) and hydroxypropyl-beta-cyclodextrin (HPβCD) for pulmonary administration. Mixtures of sCT, L-PEG or B-PEG and HPβCD were co-spray dried. Based on the particle properties, the best PEG:HPβCD ratio was 1:1 w:w for both PEGs. In the sCT-loaded particles, the L-PEG was more crystalline than B-PEG. Thus, L-PEG-based particles had lower surface free energy and better aerodynamic behavior than B-PEG-based particles. However, B-PEG-based particles provided better protection against chemical degradation of sCT. A decrease in sCT permeability, measured across Calu-3 bronchial epithelial monolayers, occurred when the PEG and HPβCD concentrations were both 1.6 wt %. This was attributed to an increase in buffer viscosity, caused by the two excipients. sCT pharmacokinetic profiles in Wistar rats were evaluated using a 2-compartment model after iv injection or lung insufflation. The maximal sCT plasma concentration was reached within 3 min following nebulization of sCT solution. L-PEG and B-PEG-based microparticles were able to increase T(max) to 20 ± 1 min and 18 ± 8 min, respectively. Furthermore, sCT absolute bioavailability after L-PEG-based microparticle aerosolization at 100 μg/kg was 2.3 times greater than for the nebulized sCT solution.
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Affiliation(s)
- Frederic Tewes
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College Dublin, Dublin 2, Ireland
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22
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Campbell M, Humphries MM, Kiang AS, Nguyen ATH, Gobbo OL, Tam LCS, Suzuki M, Hanrahan F, Ozaki E, Farrar GJ, Kenna PF, Humphries P. Systemic low-molecular weight drug delivery to pre-selected neuronal regions. EMBO Mol Med 2011; 3:235-45. [PMID: 21374818 PMCID: PMC3377070 DOI: 10.1002/emmm.201100126] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 02/04/2011] [Accepted: 02/07/2011] [Indexed: 01/23/2023] Open
Abstract
We describe a procedure for controlled, periodic, reversible modulation of selected regions of the blood–brain barrier (BBB) or the inner-blood–retina barrier (iBRB) based on incorporation into an AAV-2/9 vector of a doxycycline-inducible gene encoding shRNA targeting claudin-5, one of 30 or so proteins constituting the BBB and iBRB. The vector may be introduced stereotaxically into pre-selected regions of the brain or into the retina, rendering these regions permeable to low-molecular weight compounds up to approximately 1 kDa for the period of time during which the inducing agent, doxycycline, is administered in drinking water, but excluding potentially toxic higher molecular weight materials. We report on the use of barrier modulation in tandem with systemic drug therapy to prevent retinal degeneration and to suppress laser-induced choroidal neovascularization (CNV), the latter being the hallmark pathology associated with the exudative, or wet, form of age-related macular degeneration (AMD). These observations constitute the basis of a minimally invasive systemic therapeutic modality for retinal diseases, including retinitis pigmentosa and AMD, where, in early stage disease, the iBRB is intact and impervious to systemically administered drugs.
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Affiliation(s)
- Matthew Campbell
- Ocular Genetics Unit, Department of Genetics, Trinity College Dublin, Dublin 2, Ireland.
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Colgan NC, Cronin MM, Gobbo OL, O'Mara SM, O'Connor WT, Gilchrist MD. Quantitative MRI Analysis of Brain Volume Changes due to Controlled Cortical Impact. J Neurotrauma 2010; 27:1265-74. [DOI: 10.1089/neu.2009.1267] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Niall C. Colgan
- School of Electrical, Electronic & Mechanical Engineering, University College Dublin, Belfield, Dublin, Ireland
| | | | | | | | - William T. O'Connor
- Conway Institute, University College Dublin, Belfield, Dublin, Ireland
- Graduate Entry Medical School, University of Limerick, Castletroy, County Limerick, Ireland
| | - Michael D. Gilchrist
- School of Electrical, Electronic & Mechanical Engineering, University College Dublin, Belfield, Dublin, Ireland
- School of Human Kinetics, University of Ottawa, Ontario, Canada
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Kelly ME, Blau CW, Griffin KM, Gobbo OL, Jones JFX, Kerskens CM. Quantitative functional magnetic resonance imaging of brain activity using bolus-tracking arterial spin labeling. J Cereb Blood Flow Metab 2010; 30:913-22. [PMID: 20068581 PMCID: PMC2949184 DOI: 10.1038/jcbfm.2009.284] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) is the most widely used method for mapping neural activity in the brain. The interpretation of altered BOLD signals is problematic when cerebral blood flow (CBF) or cerebral blood volume change because of aging and/or neurodegenerative diseases. In this study, a recently developed quantitative arterial spin labeling (ASL) approach, bolus-tracking ASL (btASL), was applied to an fMRI experiment in the rat brain. The mean transit time (MTT), capillary transit time (CTT), relative cerebral blood volume of labeled water (rCBV(lw)), relative cerebral blood flow (rCBF), and perfusion coefficient in the forelimb region of the somatosensory cortex were quantified during neuronal activation and in the resting state. The average MTT and CTT were 1.939+/-0.175 and 1.606+/-0.106 secs, respectively, in the resting state. Both times decreased significantly to 1.616+/-0.207 and 1.305+/-0.201 secs, respectively, during activation. The rCBV(lw), rCBF, and perfusion coefficient increased on average by a factor of 1.123+/-0.006, 1.353+/-0.078, and 1.479+/-0.148, respectively, during activation. In contrast to BOLD techniques, btASL yields physiologically relevant indices of the functional hyperemia that accompanies neuronal activation.
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Affiliation(s)
- Michael E Kelly
- Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland
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Dunleavy M, Shinoda S, Schindler C, Ewart C, Dolan R, Gobbo OL, Kerskens CM, Henshall DC. Experimental neonatal status epilepticus and the development of temporal lobe epilepsy with unilateral hippocampal sclerosis. Am J Pathol 2009; 176:330-42. [PMID: 19948825 DOI: 10.2353/ajpath.2010.090119] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Hippocampal sclerosis is a common pathological finding in patients with temporal lobe epilepsy, including children, but a causal relationship to early-life seizures remains in question. Neonatal status epilepticus in animals can result in neuronal death within the hippocampus, although macroscopic features of hippocampal shrinkage are not evident at adulthood. Here, we examined electrophysiological and pathological consequences of focally evoked status epilepticus triggered by intra-amygdala microinjection of kainic acid in postnatal day 10 rat pups. Neonatal status epilepticus resulted in extensive neuronal death in the ipsilateral hippocampal CA1 and CA3 subfields and hilus, as assessed by DNA fragmentation and Fluoro-Jade B staining 72 hours later. The contralateral hippocampus was not significantly damaged. Histopathology at P55/P65 revealed unilateral hippocampal sclerosis (grade IV, modified Wyler/Watson scale) comprising >50% CA1 and CA3 neuron loss and astrogliosis. Additional features included hydrocephalus ex vacuo, modest dentate granule cell layer widening, and altered neuropeptide Y immunoreactivity indicative of synaptic rearrangement. Hippocampal atrophy was also evident on magnetic resonance imaging. Depth electrode recordings at adulthood detected spontaneous seizures that involved the ipsilateral hippocampus and amygdala. A significant positive correlation was found between hippocampal pathology grade and both frequency and duration of epileptic seizures at adulthood. The current study demonstrates that experimental neonatal status epilepticus can result in classical unilateral hippocampal sclerosis and temporal lobe epilepsy.
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Affiliation(s)
- Mark Dunleavy
- Department of Physiology and Medical Physics, Royal College of Surgeons in Ireland, Dublin 2, Ireland
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Gobbo OL, O'Mara SM. Combining exercise and cyclooxygenase-2 inhibition does not ameliorate learning deficits after brain insult, despite an increase in BDNF levels. Brain Res 2005; 1046:224-9. [PMID: 15885662 DOI: 10.1016/j.brainres.2005.03.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2004] [Revised: 03/22/2005] [Accepted: 03/29/2005] [Indexed: 10/25/2022]
Abstract
Neurodegeneration can produce behavioral impairments. Previously, we have found that inhibition of cyclooxygenase-2 activity or physical activity was neuroprotective during kainic-acid-induced neural loss. Here, we investigated the combined effect of exercise pre-insult and cyclooxygenase inhibitor treatment post-kainate-induced brain damage. However, in spite of an increase in BDNF levels, the combination did not improve behavioral performance in Morris watermaze and object exploration tasks.
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Affiliation(s)
- O L Gobbo
- Department of Psychology and Trinity College Institute of Neuroscience, Trinity College, Ireland
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Gobbo OL, O'Mara SM. Exercise, but not environmental enrichment, improves learning after kainic acid-induced hippocampal neurodegeneration in association with an increase in brain-derived neurotrophic factor. Behav Brain Res 2004; 159:21-6. [PMID: 15794993 DOI: 10.1016/j.bbr.2004.09.021] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2004] [Revised: 09/24/2004] [Accepted: 09/29/2004] [Indexed: 11/17/2022]
Abstract
Previous studies have suggested that exercise in a running wheel can be neuroprotective, perhaps due to, among others, gene-expression changes after exercise, increases in trophic proteins and/or enhanced cardiovascular responsivity. Here we ask whether physical exercise or environmental enrichment provide protection after brain damage, especially in terms of recovery of cognitive function. To evaluate the neuroprotective effect of these conditions, we used the kainic acid (KA) model of neuronal injury. Systemically-administered KA induces excitotoxicity by overstimulation of glutamate receptors, resulting in neuronal death by necrosis and apoptosis. Our results show that exercise, but not enriched environment, prior to KA-induced brain damage, improved behavioural performance in both Morris watermaze and object exploration tasks. However, prior exercise did not decrease to control levels the hyperactivity normally seen in KA-treated animals, as measured by ambulation in the open field. Furthermore, both exercise and enriched environment did not protect against neuron loss in CA1, CA2 and CA3 areas of the hippocampus, despite a substantial increase in brain-derived neutrophic factor (BDNF) levels in dentate gyrus of the exercise and KA-treated animals.
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Affiliation(s)
- O L Gobbo
- Department of Psychology and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland
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28
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Gobbo OL, O'Mara SM. Impact of enriched-environment housing on brain-derived neurotrophic factor and on cognitive performance after a transient global ischemia. Behav Brain Res 2004; 152:231-41. [PMID: 15196790 DOI: 10.1016/j.bbr.2003.10.017] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2003] [Revised: 10/01/2003] [Accepted: 10/04/2003] [Indexed: 10/26/2022]
Abstract
Environmental enrichment promotes structural and functional changes in the brain, including enhanced learning and memory performance in rodents. Transient global cerebral ischemia (15 min) causes specific damage to dorsal hippocampal area CA1 pyramidal cells of the rat concomitantly with cognitive deficits. Thus, we investigated if environmental enrichment can protect rats against the cognitive and neurological consequences of transient ischemia. We evaluated the impairment of learning and memory with three tasks: odour discrimination, object exploration and spatial learning. Contrary to expectation, we found that the enriched environment improved performances for both ischemic and sham rats in odour discrimination and object exploration tasks compared with standard condition housed rats. After exposure to an enriched environment, ischemic rats performed better in the water maze than those in the standard housing conditions. However, exposure to an enriched environment does not protect against actual loss of CA1 pyramidal cells. Brain-derived neurotrophic factor (BDNF) levels were increased in environmental enrichment animals compared to those housed in standard conditions. We conclude that environmental enrichment has positive effects that are independent of the effects of ischemic brain lesions.
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Affiliation(s)
- O L Gobbo
- Department of Psychology and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland
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Gobbo OL, O'Mara SM. Post-treatment, but not pre-treatment, with the selective cyclooxygenase-2 inhibitor celecoxib markedly enhances functional recovery from kainic acid-induced neurodegeneration. Neuroscience 2004; 125:317-27. [PMID: 15062975 DOI: 10.1016/j.neuroscience.2004.01.045] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/28/2004] [Indexed: 11/29/2022]
Abstract
We have investigated the role of inflammation in the excitotoxicity induced by overstimulation of glutamate receptors using kainic acid, an important tool for studying functions related to excitatory amino acid transmission and for producing neuronal death, especially in areas CA1 and CA3 of the hippocampus. We hypothesised that by inhibiting one of the major components of the neuroinflammation response, after kainic acid injection, that there would be less inflammation and therefore a reduction in cell loss, an enhancement of cognitive function (using spatial learning and object exploration tasks) or both. We examined brain-derived neurotrophic factor levels, expecting that there would be a correlation between its level and subsequent recovery. Our results confirmed our hypothesis: the kainic acid injected-rats treated with celecoxib (after kainic injection) performed better in the spatial and non-spatial tasks than the kainic acid-treated group. However, there was not any improvement if celecoxib was given before kainic acid treatment, underlining also the importance of the production of prostaglandin at the beginning of inflammation.
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Affiliation(s)
- O L Gobbo
- Department of Psychology and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland
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