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Hu F, Wang D, Ma X, Hu T, Yue Y, Tang W, Wu P, Tong T, Peng W. Concurrent Dual-Contrast Enhancement Using Fe 3O 4 Nanoparticles to Achieve a CEST Signal Controllability. ACS OMEGA 2023; 8:24153-24164. [PMID: 37457473 PMCID: PMC10339402 DOI: 10.1021/acsomega.2c07000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/13/2023] [Indexed: 07/18/2023]
Abstract
Traditional T2 magnetic resonance imaging (MRI) contrast agents have defects inherent to negative contrast agents, while chemical exchange saturation transfer (CEST) contrast agents can quantify substances at trace concentrations. After reaching a certain concentration, iron-based contrast agents can "shut down" CEST signals. The application range of T2 contrast agents can be widened through a combination of CEST and T2 contrast agents, which has promising application prospects. The purpose of this study is to develop a T2 MRI negative contrast agent with a controllable size and to explore the feasibility of dual contrast enhancement by combining T2 with CEST contrast agents. The study was carried out in vitro with HCT-116 human colon cancer cells. A GE SIGNA Pioneer 3.0 T medical MRI scanner was used to acquire CEST images with different saturation radio-frequency powers (1.25/2.5/3.75/5 μT) by 2D spin echo-echo planar imaging (SE-EPI). Magnetic resonance image compilation (MAGiC) was acquired by a multidynamic multiecho 2D fast spin-echo sequence. The feasibility of this dual-contrast enhancement method was assessed by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, dynamic light scattering, ζ potential analysis, inductively coupled plasma, X-ray photoelectron spectroscopy, X-ray powder diffraction, vibrating-sample magnetometry, MRI, and a Cell Counting Kit-8 assay. The association between the transverse relaxation rate r2 and the pH of the iron-based contrast agents was analyzed by linear fitting, and the linear relationship between the CEST effect in different B1 fields and pH was analyzed by the ratio method. Fe3O4 nanoparticles (NPs) with a mean particle size of 82.6 ± 22.4 nm were prepared by a classical process, and their surface was successfully modified with -OH active functional groups. They exhibited self-aggregation in an acidic environment. The CEST effect was enhanced as the B1 field increased, and an in vitro pH map was successfully plotted using the ratio method. Fe3O4 NPs could stably serve as reference agents at different pH values. At a concentration of 30 μg/mL, Fe3O4 NPs "shut down" the CEST signals, but when the concentration of Fe3O4 NPs was less than 10 μg/mL, the two contrast agents coexisted. The prepared Fe3O4 NPs had almost no toxicity, and when their concentration rose to 200 μg/mL at pH 6.5 or 7.4, they did not reach the half-maximum inhibitory concentration (IC50). Fe3O4 magnetic NPs with a controllable size and no toxicity were successfully synthesized. By combining Fe3O4 NPs with a CEST contrast agent, the two contrast agents could be imaged simultaneously; at higher concentrations, the iron-based contrast agent "shut down" the CEST signal. An in vitro pH map was successfully plotted by the ratio method. CEST signal inhibition can be used to realize the pH mapping of solid tumors and the identification of tumor active components, thus providing a new imaging method for tumor efficacy evaluation.
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Affiliation(s)
- Feixiang Hu
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Dan Wang
- Department
of Ultrasound, Shanghai Municipal Hospital of Traditional Chinese
Medicine, Shanghai University of Traditional
Chinese Medicine, Shanghai, People’s Republic of China. 200071
| | - Xiaowen Ma
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Tingdan Hu
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Yali Yue
- Department
of Radiology, Children’s Hospital
of Fudan University, Shanghai, People’s Republic of China 200000
| | - Wei Tang
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - PuYe Wu
- GE
Healthcare, Beijing, People’s Republic of China 100176
| | - Tong Tong
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Weijun Peng
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
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Recent Progress on Heparin–Protamine Particles for Biomedical Application. Polymers (Basel) 2022; 14:polym14050932. [PMID: 35267754 PMCID: PMC8912589 DOI: 10.3390/polym14050932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 02/01/2023] Open
Abstract
Biomolecules are attractive building blocks with self-assembly ability, structural diversity, and excellent functionality for creating artificial materials. Heparin and protamine, a clinically relevant pair of biomolecules used in cardiac and vascular surgery, have been shown to coassemble into particulate polyelectrolyte complexes in vitro. The resulting heparin–protamine particles exhibit adhesive properties that enable advantageous interactions with proteins, cells, and various other substances and have been employed as functional materials for biomedical applications. In this review article, we summarize recent progress in research on the use of heparin–protamine particles as drug carriers, cell adhesives, and cell labels. Studies have demonstrated that heparin–protamine particles are potentially versatile in biomedical fields from drug delivery and regenerative medicine to plastic surgery.
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Chen J, Hu H, Feng L, Zhu Q, Hancharou A, Liu B, Yan C, Xu Y, Guo R. Preparation and characterization of 3D porous conductive scaffolds with magnetic resonance enhancement in tissue engineering. Biomed Mater 2019; 14:045013. [DOI: 10.1088/1748-605x/ab1d9c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Mesentier-Louro LA, Dodd R, Domizi P, Nobuta H, Wernig M, Wernig G, Liao YJ. Direct targeting of the mouse optic nerve for therapeutic delivery. J Neurosci Methods 2019; 313:1-5. [PMID: 30389488 PMCID: PMC10870831 DOI: 10.1016/j.jneumeth.2018.10.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 10/29/2018] [Accepted: 10/29/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Animal models of optic nerve injury are often used to study central nervous system (CNS) degeneration and regeneration, and targeting the optic nerve is a powerful approach for axon-protective or remyelination therapy. However, the experimental delivery of drugs or cells to the optic nerve is rarely performed because injections into this structure are difficult in small animals, especially in mice. NEW METHOD We investigated and developed methods to deliver drugs or cells to the mouse optic nerve through 3 different routes: a) intraorbital, b) through the optic foramen and c) transcranial. RESULTS The methods targeted different parts of the mouse optic nerve: intraorbital proximal (intraorbital), intracranial middle (optic-foramen) or intracranial distal (transcranial) portion. COMPARISON WITH EXISTING METHODS Most existing methods target the optic nerve indirectly. For instance, intravitreally delivered cells often cannot cross the inner limiting membrane to reach retinal neurons and optic nerve axons. Systemic delivery, eye drops and intraventricular injections do not always successfully target the optic nerve. Intraorbital and transcranial injections into the optic nerve or chiasm have been performed but these methods have not been well described. We approached the optic nerve with more selective and precise targeting than existing methods. CONCLUSIONS We successfully targeted the murine optic nerve intraorbitally, through the optic foramen, and transcranially. Of all methods, the injection through the optic foramen is likely the most innovative and fastest. These methods offer additional approaches for therapeutic intervention to be used by those studying white matter damage and axonal regeneration in the CNS.
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Affiliation(s)
| | - Robert Dodd
- Department of Neurosurgery Stanford University School of Medicine, Palo Alto, CA, USA
| | - Pablo Domizi
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Hiroko Nobuta
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Marius Wernig
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Gerlinde Wernig
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Yaping Joyce Liao
- Department of Ophthalmology, Stanford University School of Medicine, Palo Alto, CA, USA; Department of Neurology, Stanford University School of Medicine, Palo Alto, CA, USA.
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5
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Orsini G, Pagella P, Putignano A, Mitsiadis TA. Novel Biological and Technological Platforms for Dental Clinical Use. Front Physiol 2018; 9:1102. [PMID: 30135661 PMCID: PMC6092501 DOI: 10.3389/fphys.2018.01102] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 07/23/2018] [Indexed: 12/27/2022] Open
Abstract
Human teeth have a limited capacity to regenerate and thus biological reconstruction of damaged or lost dental tissues remains a significant challange in modern dentistry. Recent efforts focus on alternative therapeutic approaches for partial or whole tooth regeneration that complement traditional dental treatments using sophisticated materials and dental implants. These multidisciplinary approaches are based on the combination of stem cells with advanced tissue engineer products and computing technology, and they hold great promise for future applications in dentistry. The administration to patients of dynamic biological agents composed by stem cells and scaffolds will certainly increase the regenerative capacity of dental pathological tissues. The design of innovative materials for tissue restoration, diagnostics, imaging, and targeted pharmaceutical treatment will significantly improve the quality of dental care and will have a major societal impact. This review depicts the current challenges in dentistry and describes the possibilities for novel and succesful therapeutic applications in the near future.
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Affiliation(s)
- Giovanna Orsini
- Orofacial Development and Regeneration, Institute of Oral Biology, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland
- Department of Clinical Sciences and Stomatology, Marche Polytechnic University, Ancona, Italy
| | - Pierfrancesco Pagella
- Orofacial Development and Regeneration, Institute of Oral Biology, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | - Angelo Putignano
- Department of Clinical Sciences and Stomatology, Marche Polytechnic University, Ancona, Italy
| | - Thimios A. Mitsiadis
- Orofacial Development and Regeneration, Institute of Oral Biology, Center of Dental Medicine, Faculty of Medicine, University of Zurich, Zurich, Switzerland
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Mangoni M, Livi L, Biti G, Di Cataldo V, Capaccioli N, Castier Y, Loriot Y, Mordant P, Deutsch E. Stem Cell Tracking: Toward Clinical Application in Oncology? TUMORI JOURNAL 2018; 98:535-42. [DOI: 10.1177/030089161209800501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Noninvasive cellular imaging allows the tracking of grafted cells as well as the monitoring of their migration, suggesting potential applications to track both cancer and therapeutic stem cells. Cell tracking can be performed by two approaches: direct labeling (cells are labeled with tags) and indirect labeling (cells are transfected with a reporter gene and visualized after administration of a reporter probe). Techniques for in vivo detection of grafted cells include optic imaging, nuclear medicine imaging, magnetic resonance imaging, microCT imaging and ultrasound imaging. The ideal imaging modality would bring together high sensitivity, high resolution and low toxicity. All of the available imaging methods are based on different principles, have different properties and different limitations, so several of them can be considered complementary. Transfer of these preclinical cellular imaging modalities to stem cells has already been reported, and transfer to clinical practice within the next years can be reasonably considered.
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Affiliation(s)
- Monica Mangoni
- UPRES EA 2710, Gustave Roussy
Institute, Villejuif, France
- Clinical Physiopathology Department,
Radiotherapy Unit, University of Florence, Florence, Italy
| | - Lorenzo Livi
- Clinical Physiopathology Department,
Radiotherapy Unit, University of Florence, Florence, Italy
| | - Giampaolo Biti
- Clinical Physiopathology Department,
Radiotherapy Unit, University of Florence, Florence, Italy
| | - Vanessa Di Cataldo
- Clinical Physiopathology Department,
Radiotherapy Unit, University of Florence, Florence, Italy
| | - Neri Capaccioli
- Department of Anatomy, Histology and
Forensic Medicine, University of Florence, Florence, Italy
- Radiology Unit, Val di Sieve Clinic,
Florence, Italy
| | - Yves Castier
- Department of General Thoracic and
Vascular Surgery, Bichat Hospital, Paris Diderot University, Paris, France
| | - Yohann Loriot
- UPRES EA 2710, Gustave Roussy
Institute, Villejuif, France
- Department of General Thoracic and
Vascular Surgery, Bichat Hospital, Paris Diderot University, Paris, France
| | - Pierre Mordant
- UPRES EA 2710, Gustave Roussy
Institute, Villejuif, France
- Department of Medicine, Gustave Roussy
Institute, Villejuif, France
| | - Eric Deutsch
- UPRES EA 2710, Gustave Roussy
Institute, Villejuif, France
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Facile Synthesis of Folic Acid-Modified Iron Oxide Nanoparticles for Targeted MR Imaging in Pulmonary Tumor Xenografts. Mol Imaging Biol 2017; 18:569-78. [PMID: 26620721 DOI: 10.1007/s11307-015-0918-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
PURPOSE The purpose of this study was to develop folic acid (FA)-modified iron oxide (Fe3O4) nanoparticles (NPs) for targeted magnetic resonance imaging (MRI) of H460 lung carcinoma cells. PROCEDURES Water-dispersible Fe3O4 NPs synthesized via a mild reduction method were conjugated with FA to generate FA-targeted Fe3O4 NPs. The specificity of FA-targeted Fe3O4 NPs to bind FA receptor was investigated in vitro by cellular uptake and cell MRI and in vivo by MRI of H460 tumors. RESULTS The formed NPs displayed good biocompatibility and ultrahigh r 2 relaxivity (440.01/mM/s). The targeting effect of the NPs to H460 cells was confirmed by in vitro cellular uptake and cell MRI. H460 tumors showed a significant reduction in T2 signal intensity at 0.85 h, which then recovered and returned to control at 2.35 h. CONCLUSIONS The results indicate that the prepared FA-targeted Fe3O4 NPs have potential to be used as T2 negative contrast agents in targeted MRI.
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Zhao J, Guan X, Liu Y, Piao H, Liu R, Zhou X, Sun B, Du Y, Liu J. Potential role of tracing stem cell transplantation and effects on the immune cell function of ferumoxytol combining with heparin and protamine in vivo/in vitro. Cell Biol Int 2017; 41:423-432. [PMID: 28150359 DOI: 10.1002/cbin.10737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 01/31/2017] [Indexed: 11/10/2022]
Abstract
Cell labeling and tracing have played an increasingly important role in the field of stem cell transplantation. Nanocomplexes combining three Food and Drug Administration (FDA)-approved drugs: heparin (H), protamine (P), and ferumoxytol (F) (HPF nanocomplexes) display high labeling efficiency in human adipose tissue-derived stem cells (hADSCs), but their biological safety has not been determined. In this study, we tested the labeling efficiency of HPF in hADSCs through in vitro cytotoxicity studies and in vivo murine preclinical studies using HPF-labeled hADSCs. The labeling process did not cause cell apoptosis and had little effect on cell proliferation. In vivo magnetic resonance imaging (MRI) showed that the HPF-labeled cells produced a hypointense signal that did not affect liver and kidney functions. However, after injection of HPF-labeled cells into mice, lymphocyte transformation testing showed that T and B lymphocyte proliferation was significantly increased. These findings suggest that extensive safety testing of HPF nanocomplexes is necessary; the process to evaluate HPF as an investigative new drug application could therefore be postponed.
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Affiliation(s)
- Jingyuan Zhao
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
| | - Xin Guan
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
| | - Yang Liu
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
| | - Hua Piao
- College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Rutao Liu
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
| | - Xiang Zhou
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
| | - Bo Sun
- Department of Radiology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yue Du
- College of Basic Medical Sciences, Dalian Medical University, Dalian, China
| | - Jing Liu
- Regenerative Medicine Center, The First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, 116011, China
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9
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Yoon HY, Jeon S, You DG, Park JH, Kwon IC, Koo H, Kim K. Inorganic Nanoparticles for Image-Guided Therapy. Bioconjug Chem 2016; 28:124-134. [DOI: 10.1021/acs.bioconjchem.6b00512] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hong Yeol Yoon
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Sangmin Jeon
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- School
of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro,
Jangan-gu, Suwon 16419, Republic of Korea
| | - Dong Gil You
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- School
of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro,
Jangan-gu, Suwon 16419, Republic of Korea
| | - Jae Hyung Park
- School
of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro,
Jangan-gu, Suwon 16419, Republic of Korea
| | - Ick Chan Kwon
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Heebeom Koo
- Department
of Medical Lifescience, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul 06591, Republic of Korea
| | - Kwangmeyung Kim
- Center
for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
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Review of Preclinical and Clinical Studies of Bone Marrow-Derived Cell Therapies for Intracerebral Hemorrhage. Stem Cells Int 2016; 2016:4617983. [PMID: 27698671 PMCID: PMC5028871 DOI: 10.1155/2016/4617983] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 06/01/2016] [Indexed: 12/22/2022] Open
Abstract
Stroke is the second leading cause of mortality worldwide, causing millions of deaths annually, and is also a major cause of disability-adjusted life years. Hemorrhagic stroke accounts for approximately 10 to 27% of all cases and has a fatality rate of about 50% in the first 30 days, with limited treatment possibilities. In the past two decades, the therapeutic potential of bone marrow-derived cells (particularly mesenchymal stem cells and mononuclear cells) has been intensively investigated in preclinical models of different neurological diseases, including models of intracerebral hemorrhage and subarachnoid hemorrhage. More recently, clinical studies, most of them small, unblinded, and nonrandomized, have suggested that the therapy with bone marrow-derived cells is safe and feasible in patients with ischemic or hemorrhagic stroke. This review discusses the available evidence on the use of bone marrow-derived cells to treat hemorrhagic strokes. Distinctive properties of animal studies are analyzed, including study design, cell dose, administration route, therapeutic time window, and possible mechanisms of action. Furthermore, clinical trials are also reviewed and discussed, with the objective of improving future studies in the field.
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11
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Physicochemical characterization of ferumoxytol, heparin and protamine nanocomplexes for improved magnetic labeling of stem cells. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 13:503-513. [PMID: 27520728 DOI: 10.1016/j.nano.2016.07.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 07/05/2016] [Accepted: 07/27/2016] [Indexed: 12/25/2022]
Abstract
Stem cell-based therapies have become a major focus in regenerative medicine and to treat diseases. A straightforward approach combining three drugs, heparin (H), protamine (P) with ferumoxytol (F) in the form of nanocomplexes (NCs) effectively labeled stem cells for cellular MRI. We report on the physicochemical characteristics for optimizing the H, P, and F components in different ratios, and mixing sequences, producing NCs that varied in hydrodynamic size. NC size depended on the order in which drugs were mixed in media. Electron microscopy of HPF or FHP showed that F was located on the surface of spheroidal shaped HP complexes. Human stem cells incubated with FHP NCs resulted in a significantly greater iron concentration per cell compared to that found in HPF NCs with the same concentration of F. These results indicate that FHP could be useful for labeling stem cells in translational studies in the clinic.
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12
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Ariza de Schellenberger A, Kratz H, Farr TD, Löwa N, Hauptmann R, Wagner S, Taupitz M, Schnorr J, Schellenberger EA. Labeling of mesenchymal stem cells for MRI with single-cell sensitivity. Int J Nanomedicine 2016; 11:1517-35. [PMID: 27110112 PMCID: PMC4835118 DOI: 10.2147/ijn.s101141] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Sensitive cell detection by magnetic resonance imaging (MRI) is an important tool for the development of cell therapies. However, clinically approved contrast agents that allow single-cell detection are currently not available. Therefore, we compared very small iron oxide nanoparticles (VSOP) and new multicore carboxymethyl dextran-coated iron oxide nanoparticles (multicore particles, MCP) designed by our department for magnetic particle imaging (MPI) with discontinued Resovist® regarding their suitability for detection of single mesenchymal stem cells (MSC) by MRI. We achieved an average intracellular nanoparticle (NP) load of >10 pg Fe per cell without the use of transfection agents. NP loading did not lead to significantly different results in proliferation, colony formation, and multilineage in vitro differentiation assays in comparison to controls. MRI allowed single-cell detection using VSOP, MCP, and Resovist® in conjunction with high-resolution T2*-weighted imaging at 7 T with postprocessing of phase images in agarose cell phantoms and in vivo after delivery of 2,000 NP-labeled MSC into mouse brains via the left carotid artery. With optimized labeling conditions, a detection rate of ~45% was achieved; however, the experiments were limited by nonhomogeneous NP loading of the MSC population. Attempts should be made to achieve better cell separation for homogeneous NP loading and to thus improve NP-uptake-dependent biocompatibility studies and cell detection by MRI and future MPI. Additionally, using a 7 T MR imager equipped with a cryocoil resulted in approximately two times higher detection. In conclusion, we established labeling conditions for new high-relaxivity MCP, VSOP, and Resovist® for improved MRI of MSC with single-cell sensitivity.
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Affiliation(s)
| | - Harald Kratz
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Tracy D Farr
- Department of Experimental Neurology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany; School of Life Sciences, University of Nottingham, Medical School, Nottingham, UK
| | - Norbert Löwa
- Department of Biomagnetic Signals, Physikalisch-Technische Bundesanstalt Berlin, Berlin, Germany
| | - Ralf Hauptmann
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Susanne Wagner
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Matthias Taupitz
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Jörg Schnorr
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Eyk A Schellenberger
- Department of Radiology, Center for Stroke Research Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
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13
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In Vivo Tracking of Cell Therapies for Cardiac Diseases with Nuclear Medicine. Stem Cells Int 2016; 2016:3140120. [PMID: 26880951 PMCID: PMC4737458 DOI: 10.1155/2016/3140120] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 10/18/2015] [Accepted: 10/20/2015] [Indexed: 12/31/2022] Open
Abstract
Even though heart diseases are amongst the main causes of mortality and morbidity in the world, existing treatments are limited in restoring cardiac lesions. Cell transplantations, originally developed for the treatment of hematologic ailments, are presently being explored in preclinical and clinical trials for cardiac diseases. Nonetheless, little is known about the possible efficacy and mechanisms for these therapies and they are the center of continuous investigation. In this scenario, noninvasive imaging techniques lead to greater comprehension of cell therapies. Radiopharmaceutical cell labeling, firstly developed to track leukocytes, has been used successfully to evaluate the migration of cell therapies for myocardial diseases. A substantial rise in the amount of reports employing this methodology has taken place in the previous years. We will review the diverse radiopharmaceuticals, imaging modalities, and results of experimental and clinical studies published until now. Also, we report on current limitations and potential advances of radiopharmaceutical labeling for cell therapies in cardiac diseases.
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14
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Bone Marrow-Derived Cells as a Therapeutic Approach to Optic Nerve Diseases. Stem Cells Int 2015; 2016:5078619. [PMID: 26649049 PMCID: PMC4663341 DOI: 10.1155/2016/5078619] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 09/10/2015] [Indexed: 12/16/2022] Open
Abstract
Following optic nerve injury associated with acute or progressive diseases, retinal ganglion cells (RGCs) of adult mammals degenerate and undergo apoptosis. These diseases have limited therapeutic options, due to the low inherent capacity of RGCs to regenerate and due to the inhibitory milieu of the central nervous system. Among the numerous treatment approaches investigated to stimulate neuronal survival and axonal extension, cell transplantation emerges as a promising option. This review focuses on cell therapies with bone marrow mononuclear cells and bone marrow-derived mesenchymal stem cells, which have shown positive therapeutic effects in animal models of optic neuropathies. Different aspects of available preclinical studies are analyzed, including cell distribution, potential doses, routes of administration, and mechanisms of action. Finally, published and ongoing clinical trials are summarized.
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15
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Kim SJ, Lewis B, Steiner MS, Bissa UV, Dose C, Frank JA. Superparamagnetic iron oxide nanoparticles for direct labeling of stem cells and in vivo MRI tracking. CONTRAST MEDIA & MOLECULAR IMAGING 2015; 11:55-64. [PMID: 26234504 DOI: 10.1002/cmmi.1658] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 05/05/2015] [Accepted: 06/22/2015] [Indexed: 12/12/2022]
Abstract
To develop effective stem cell therapies, it is important to track therapeutic cells non-invasively and monitor homing to areas of pathology. The purpose of this study was to design and evaluate the labeling efficiency of commercially available dextran-coated superparamagnetic iron oxide nanoparticles, FeraTrack Direct (FTD), in various stem and immune cells; assess the cytotoxicity and tolerability of the FTD in stem cells; and monitor stem cell homing using FTD-labeled bone-marrow-derived mesenchymal stromal cells (BMSCs) and neural stem cells (NSCs) in a tumor model by in vivo MRI. BMSCs, NSCs, hematopoietic stem cells (HSCs), T-lymphocytes, and monocytes were labeled effectively with FTD without the need for transfection agents, and Prussian blue (PB) staining and transmission electron microscopy (TEM) confirmed intracellular uptake of the agent. The viability, proliferation, and functionality of the labeled cells were minimally or not affected after labeling. When 10(6) FTD-labeled BMSCs or NSCs were injected into C6 glioma bearing nude mice, the cells homing to the tumors were detected as hypointense regions within the tumor using 3 T clinical MRI up to 10 days post injection. Histological analysis confirmed the homing of injected cells to the tumor by the presence of PB positive cells that are not macrophages. Labeling of stem cells or immune cells with FTD was non-toxic, and should facilitate the translation of this agent to clinical trials for evaluation of trafficking of cells by MRI.
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Affiliation(s)
- Saejeong J Kim
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA
| | - Bobbi Lewis
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA
| | | | | | | | - Joseph A Frank
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA.,Intramural Research Program, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
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Yin Y, Zhou X, Guan X, Liu Y, Jiang CB, Liu J. In vivo tracking of human adipose-derived stem cells labeled with ferumoxytol in rats with middle cerebral artery occlusion by magnetic resonance imaging. Neural Regen Res 2015. [PMID: 26199607 PMCID: PMC4498352 DOI: 10.4103/1673-5374.158355] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Ferumoxytol, an iron replacement product, is a new type of superparamagnetic iron oxide approved by the US Food and Drug Administration. Herein, we assessed the feasibility of tracking transplanted human adipose-derived stem cells labeled with ferumoxytol in middle cerebral artery occlusion-injured rats by 3.0 T MRI in vivo. 1 × 104 human adipose-derived stem cells labeled with ferumoxytol-heparin-protamine were transplanted into the brains of rats with middle cerebral artery occlusion. Neurologic impairment was scored at 1, 7, 14, and 28 days after transplantation. T2-weighted imaging and enhanced susceptibility-weighted angiography were used to observe transplanted cells. Results of imaging tests were compared with results of Prussian blue staining. The modified neurologic impairment scores were significantly lower in rats transplanted with cells at all time points except 1 day post-transplantation compared with rats without transplantation. Regions with hypointense signals on T2-weighted and enhanced susceptibility-weighted angiography images corresponded with areas stained by Prussian blue, suggesting the presence of superparamagnetic iron oxide particles within the engrafted cells. Enhanced susceptibility-weighted angiography image exhibited better sensitivity and contrast in tracing ferumoxytol-heparin-protamine-labeled human adipose-derived stem cells compared with T2-weighted imaging in routine MRI.
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Affiliation(s)
- Yan Yin
- Department of Neurology, the Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
| | - Xiang Zhou
- Department of Neurology, the First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
| | - Xin Guan
- College of Life Sciences, Liaoning Normal University, Dalian, Liaoning Province, China
| | - Yang Liu
- Regenerative Medicine Center, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
| | - Chang-Bin Jiang
- Department of Neurology, the First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
| | - Jing Liu
- Regenerative Medicine Center, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning Province, China
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17
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Turtzo LC, Budde MD, Dean DD, Gold EM, Lewis BK, Janes L, Lescher J, Coppola T, Yarnell A, Grunberg NE, Frank JA. Failure of intravenous or intracardiac delivery of mesenchymal stromal cells to improve outcomes after focal traumatic brain injury in the female rat. PLoS One 2015; 10:e0126551. [PMID: 25946089 PMCID: PMC4422703 DOI: 10.1371/journal.pone.0126551] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 04/03/2015] [Indexed: 01/16/2023] Open
Abstract
Mesenchymal stromal cells secrete a variety of anti-inflammatory factors and may provide a regenerative medicine option for the treatment of traumatic brain injury. The present study investigates the efficacy of multiple intravenous or intracardiac administrations of rat mesenchymal stromal cells or human mesenchymal stromal cells in female rats after controlled cortical impact by in vivo MRI, neurobehavior, and histopathology evaluation. Neither intravenous nor intracardiac administration of mesenchymal stromal cells derived from either rats or humans improved MRI measures of lesion volume or neurobehavioral outcome compared to saline treatment. Few mesenchymal stromal cells (<0.0005% of injected dose) were found within 3 days of last dosage at the site of injury after either delivery route, with no mesenchymal stromal cells being detectable in brain at 30 or 56 days post-injury. These findings suggest that non-autologous mesenchymal stromal cells therapy via intravenous or intracardiac administration is not a promising treatment after focal contusion traumatic brain injury in this female rodent model.
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Affiliation(s)
- L. Christine Turtzo
- Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
| | - Matthew D. Budde
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Dana D. Dean
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Eric M. Gold
- Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Bobbi K. Lewis
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Lindsay Janes
- Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Jacob Lescher
- Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Tiziana Coppola
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Angela Yarnell
- Department of Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
| | - Neil E. Grunberg
- Department of Medical and Clinical Psychology, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States of America
| | - Joseph A. Frank
- Frank Laboratory, National Institutes of Health, Bethesda, Maryland, United States of America
- National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland, United States of America
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18
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Sanganeria P, Chandra S, Bahadur D, Khanna A. Effect of HSA coated iron oxide labeling on human umbilical cord derived mesenchymal stem cells. NANOTECHNOLOGY 2015; 26:125103. [PMID: 25744689 DOI: 10.1088/0957-4484/26/12/125103] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Human umbilical cord derived mesenchymal stem cells (hUC-MSCs) are known for self-renewal and differentiation into cells of various lineages like bone, cartilage and fat. They have been used in biomedical applications to treat degenerative disorders. However, to exploit the therapeutic potential of stem cells, there is a requirement of sensitive non-invasive imaging techniques which will offer the ability to track transplanted cells, bio-distribution, proliferation and differentiation. In this study, we have analyzed the efficacy of human serum albumin coated iron oxide nanoparticles (HSA-IONPs) on the differentiation of hUC-MSCs. The colloidal stability of the HSA-IONPs was tested over a long period of time (≥20 months) and the optimized concentration of HSA-IONPs for labeling the stem cells was 60 μg ml(-1). Detailed in vitro assays have been performed to ascertain the effect of the nanoparticles (NPs) on stem cells. Lactate dehydrogenase (LDH) assay showed minimum release of LDH depicting the least disruptions in cellular membrane. At the same time, mitochondrial impairment of the cells was also not observed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Flow cytometry analysis revealed lesser generation of reactive oxygen species in HSA-IONPs labeled hUC-MSCs in comparison to bare and commercial IONPs. Transmission electron microscopy showed endocytic engulfment of the NPs by the hUC-MSCs. During the process, the gross morphologies of the actin cytoskeleton were found to be intact as shown by immunofluorescence microscopy. Also, the engulfment of the HSA-IONPs did not show any detrimental effect on the differentiation potential of the stem cells into adipocytes, osteocytes and chondrocytes, thereby confirming that the inherent properties of stem cells were maintained.
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Affiliation(s)
- Purva Sanganeria
- Department of Biological Sciences, School of Science, NMIMS University, Vile Parle (West), Mumbai 400056, India
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19
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Verma VK, Kamaraju SR, Kancherla R, Kona LK, Beevi SS, Debnath T, Usha SP, Vadapalli R, Arbab AS, Chelluri LK. Fluorescent magnetic iron oxide nanoparticles for cardiac precursor cell selection from stromal vascular fraction and optimization for magnetic resonance imaging. Int J Nanomedicine 2015; 10:711-26. [PMID: 25653519 PMCID: PMC4309779 DOI: 10.2147/ijn.s75445] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Fluorescent magnetic iron oxide nanoparticles have been used to label cells for imaging as well as for therapeutic purposes. The purpose of this study was to modify the approach to develop a nanoprobe for cell selection and imaging with a direct therapeutic translational focus. The approach involves physical coincubation and adsorption of superparamagnetic iron oxide nanoparticle-polyethylene glycol (SPION-PEG) complexes with a monoclonal antibody (mAb) or a set of antibodies. Flow cytometry, confocal laser scanning microscopy, transmission electron microscopy, iron staining, and magnetic resonance imaging were used to assess cell viability, function, and labeling efficiency. This process has been validated by selecting adipose tissue-derived cardiac progenitor cells from the stromal vascular fraction using signal regulatory protein alpha (SIRPA)/kinase domain receptor (KDR) mAbs. These markers were chosen because of their sustained expression during cardiomyocyte differentiation. Sorting of cells positive for SIRPA and KDR allowed the enrichment of cardiac progenitors with 90% troponin-I positivity in differentiation cultures. SPION labeled cardiac progenitor cells (1×10(5) cells) was mixed with gel and used for 3T magnetic resonance imaging at a concentration, as low as 12.5 μg of iron. The toxicity assays, at cellular and molecular levels, did not show any detrimental effects of SPION. Our study has the potential to achieve moderate to high specific cell selection for the dual purpose of imaging and therapy.
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Affiliation(s)
- Vinod Kumar Verma
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Suguna Ratnakar Kamaraju
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Ravindranath Kancherla
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Lakshmi K Kona
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Syed Sultan Beevi
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Tanya Debnath
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | - Shalini P Usha
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
| | | | - Ali Syed Arbab
- Department of Biochemistry and Molecular Biology, Georgia Regents University, Augusta, GA, USA
| | - Lakshmi Kiran Chelluri
- Department of Transplant Biology, Immunology and Stem Cell Laboratory, Global Hospitals, Hyderabad, India
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21
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Delling U, Brehm W, Metzger M, Ludewig E, Winter K, Jülke H. In vivo tracking and fate of intra-articularly injected superparamagnetic iron oxide particle-labeled multipotent stromal cells in an ovine model of osteoarthritis. Cell Transplant 2014; 24:2379-90. [PMID: 25506789 DOI: 10.3727/096368914x685654] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In this study, superparamagnetic iron oxide (SPIO) particle-labeled mesenchymal stromal cells (MSCs) were injected intra-articularly into osteoarthritic knee joints. Their fate and distribution were evaluated using magnetic resonance imaging (MRI) and macroscopic and histologic postmortem examination. Osteoarthritis was induced in 12 sheep by bilateral meniscectomy. After 6 weeks, one knee joint received 10 × 10(6) SPIO-labeled MSCs (Molday Ion Rhodamine B). Contralateral knees received a control injection of a) PBS, b) SPIO in PBS, c) 10 × 10(6) nonvital SPIO-labeled MSCs in PBS, or d) no injection. MR images were acquired immediately after injection and 1, 4, 8, and 12 weeks thereafter using a 0.5-T unit and a T2* sequence. Signal intensity of synovial fluid and synovial lining was assessed semiquantitatively using a scoring system. Viable SPIO-labeled MSCs produced a strong hypointense signal in the synovial fluid immediately after injection, but normal signal intensity of the synovial fluid was observed 1 week later. Synovial lining maintained its hypointensity throughout the study period. Nonvital SPIO-labeled MSCs induced hypointense signals of the synovial fluid; synovial lining appeared weak and inconsistently hypointense in the following weeks. Pure SPIO produced a strong hyperintense signal in the synovial fluid at the time of injection only. Histologically, in all knee joints receiving viable SPIO-labeled MSCs, SPIO particles were detected (Prussian blue) within the synovial lining, dorsal fat pad, and neomeniscus tissue, but not in osteochondral samples. Few SPIO particles were detected in joints injected with nonvital SPIO-labeled MSCs. Immunohistologically, no increased cell death (TUNEL) was observed in the area of detected SPIO particles, but we did observe potential chondrogenic cell differentiation (Safranin O or S100β). We conclude that viable SPIO-labeled MSCs remain detectable within the joint for 12 weeks and attach themselves to some but not all diseased joint structures.
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Affiliation(s)
- Uta Delling
- University of Leipzig, Faculty of Veterinary Medicine, Large Animal Clinic for Surgery, Leipzig, Germany
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22
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Shalaby T, Fiaschetti G, Baumgartner M, Grotzer MA. MicroRNA signatures as biomarkers and therapeutic target for CNS embryonal tumors: the pros and the cons. Int J Mol Sci 2014; 15:21554-86. [PMID: 25421247 PMCID: PMC4264241 DOI: 10.3390/ijms151121554] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/07/2014] [Accepted: 11/08/2014] [Indexed: 12/19/2022] Open
Abstract
Embryonal tumors of the central nervous system represent a heterogeneous group of childhood cancers with an unknown pathogenesis; diagnosis, on the basis of histological appearance alone, is controversial and patients’ response to therapy is difficult to predict. They encompass medulloblastoma, atypical teratoid/rhabdoid tumors and a group of primitive neuroectodermal tumors. All are aggressive tumors with the tendency to disseminate throughout the central nervous system. The large amount of genomic and molecular data generated over the last 5–10 years encourages optimism that new molecular targets will soon improve outcomes. Recent neurobiological studies have uncovered the key role of microRNAs (miRNAs) in embryonal tumors biology and their potential use as biomarkers is increasingly being recognized and investigated. However the successful use of microRNAs as reliable biomarkers for the detection and management of pediatric brain tumors represents a substantial challenge. This review debates the importance of miRNAs in the biology of central nervous systemembryonal tumors focusing on medulloblastoma and atypical teratoid/rhabdoid tumors and highlights the advantages as well as the limitations of their prospective application as biomarkers and candidates for molecular therapeutic targets.
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Affiliation(s)
- Tarek Shalaby
- Department of Oncology, University Children's Hospital of Zurich, Steinwiesstrasse 75, Zurich 8032, Switzerland.
| | - Giulio Fiaschetti
- Department of Oncology, University Children's Hospital of Zurich, Steinwiesstrasse 75, Zurich 8032, Switzerland.
| | - Martin Baumgartner
- Department of Oncology, University Children's Hospital of Zurich, Steinwiesstrasse 75, Zurich 8032, Switzerland.
| | - Michael A Grotzer
- Department of Oncology, University Children's Hospital of Zurich, Steinwiesstrasse 75, Zurich 8032, Switzerland.
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23
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A simple way to track single gold-loaded alginate microcapsules using x-ray CT in small animal longitudinal studies. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2014; 10:1821-8. [DOI: 10.1016/j.nano.2014.06.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 06/11/2014] [Indexed: 12/12/2022]
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Doyle KP, Quach LN, Arceuil HED, Buckwalter MS. Ferumoxytol administration does not alter infarct volume or the inflammatory response to stroke in mice. Neurosci Lett 2014; 584:236-40. [PMID: 25449870 DOI: 10.1016/j.neulet.2014.10.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 10/16/2014] [Accepted: 10/23/2014] [Indexed: 10/24/2022]
Abstract
Ferumoxytol is an ultrasmall superparamagnetic iron oxide (USPIO) nanoparticle that is FDA-approved as an intravenous iron replacement therapy for the treatment of iron deficiency anemia in patients with chronic kidney disease. Ferumoxytol has also been used as a contrast agent for cerebral blood volume mapping by magnetic resonance imaging (MRI), which suggests it could be used for imaging hemodynamic abnormalities after stroke. However, circulating macrophages can internalize USPIOs, and recent data indicate that the accumulation of iron in macrophages can lead them to adopt the M1 pro-inflammatory phenotype. Therefore, the uptake of intravenously administered iron particles by circulating macrophages that home to the stroke core could potentially alter the inflammatory response to stroke. To test this possibility in vivo we administered a dose of ferumoxytol previously used to obtain cerebral blood volume maps in healthy humans by steady-state susceptibility contrast (SSC) MRI to BALB/cJ mice 48h after stroke and examined cytokine levels, microglial/macrophage activation, and lesion volume in the brain 5 days later. Treatment with ferumoxytol did not lead to any differences in these parameters. These data indicate that the use of ferumoxytol as a contrast agent for brain imaging after stroke does not alter the inflammatory response to stroke in mice, and is therefore unlikely to do so in human subjects.
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Affiliation(s)
- Kristian P Doyle
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA; Department of Immunobiology, Department of Neurology, and the Arizona Center on Aging, University of Arizona, Tucson, AZ, USA
| | - Lisa N Quach
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Helen E D' Arceuil
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Marion S Buckwalter
- Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA, USA; Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA, USA.
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25
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Naumova AV, Modo M, Moore A, Murry CE, Frank JA. Clinical imaging in regenerative medicine. Nat Biotechnol 2014; 32:804-18. [PMID: 25093889 PMCID: PMC4164232 DOI: 10.1038/nbt.2993] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 07/15/2014] [Indexed: 01/09/2023]
Abstract
In regenerative medicine, clinical imaging is indispensable for characterizing damaged tissue and for measuring the safety and efficacy of therapy. However, the ability to track the fate and function of transplanted cells with current technologies is limited. Exogenous contrast labels such as nanoparticles give a strong signal in the short term but are unreliable long term. Genetically encoded labels are good both short- and long-term in animals, but in the human setting they raise regulatory issues related to the safety of genomic integration and potential immunogenicity of reporter proteins. Imaging studies in brain, heart and islets share a common set of challenges, including developing novel labeling approaches to improve detection thresholds and early delineation of toxicity and function. Key areas for future research include addressing safety concerns associated with genetic labels and developing methods to follow cell survival, differentiation and integration with host tissue. Imaging may bridge the gap between cell therapies and health outcomes by elucidating mechanisms of action through longitudinal monitoring.
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Affiliation(s)
- Anna V Naumova
- Department of Radiology, University of Washington, Seattle, Washington, USA,Center for Cardiovascular Biology, University of Washington, Seattle, Washington, USA,Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington, USA
| | - Michel Modo
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA,Centre for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania, USA,Department of Radiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA,Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Anna Moore
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, Massachusetts, USA
| | - Charles E Murry
- Center for Cardiovascular Biology, University of Washington, Seattle, Washington, USA,Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, Washington, USA,Department of Pathology, University of Washington, Seattle, Washington, USA,Department of Bioengineering, University of Washington, Seattle, Washington, USA,Department of Medicine/Cardiology, University of Washington, Seattle, Washington, USA
| | - Joseph A Frank
- Radiology and Imaging Sciences, Clinical, National Institutes of Health, Bethesda, Maryland, USA,National Institutes of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland, USA
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Radiopharmaceutical stem cell tracking for neurological diseases. BIOMED RESEARCH INTERNATIONAL 2014; 2014:417091. [PMID: 24982880 PMCID: PMC4055613 DOI: 10.1155/2014/417091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 05/03/2014] [Indexed: 01/27/2023]
Abstract
Although neurological ailments continue to be some of the main causes of disease burden in the world, current therapies such as pharmacological agents have limited potential in the restoration of neural functions. Cell therapies, firstly applied to treat different hematological diseases, are now being investigated in preclinical and clinical studies for neurological illnesses. However, the potential applications and mechanisms for such treatments are still poorly comprehended and are the focus of permanent research. In this setting, noninvasive in vivo imaging allows better understanding of several aspects of stem cell therapies. Amongst the various methods available, radioisotope cell labeling has become one of the most promising since it permits tracking of cells after injection by different routes to investigate their biodistribution. A significant increase in the number of studies utilizing this method has occurred in the last years. Here, we review the different radiopharmaceuticals, imaging techniques, and findings of the preclinical and clinical reports published up to now. Moreover, we discuss the limitations and future applications of radioisotope cell labeling in the field of cell transplantation for neurological diseases.
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27
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Toxicity evaluation following intratracheal instillation of iron oxide in a silica matrix in rats. BIOMED RESEARCH INTERNATIONAL 2014; 2014:134260. [PMID: 24949417 PMCID: PMC4053145 DOI: 10.1155/2014/134260] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 04/22/2014] [Indexed: 12/15/2022]
Abstract
Iron oxide-silica nanoparticles (IOSi-NPs) were prepared from a mixture of ferrous chloride tetrahydrate and ferric chloride hexahydrate dropped into a silica xerogel composite. The structure and morphology of the synthesized maghemite nanoparticles into the silica xerogel were analysed by X-ray diffraction measurements, scanning electron microscopy equipped with an energy dispersive X-ray spectrometer, and transmission electron microscopy. The results of the EDAX analysis indicated that the embedded particles were iron oxide nanoparticles. The particle size of IOSi-NPs calculated from the XRD analysis was estimated at around 12.5 nm. The average size deduced from the particle size distribution is 13.7 ± 0.6 nm, which is in good agreement with XRD analysis. The biocompatibility of IOSi-NPs was assessed by cell viability and cytoskeleton analysis. Histopathology analysis was performed after 24 hours and 7 days, respectively, from the intratracheal instillation of a solution containing 0.5, 2.5, or 5 mg/kg IOSi-NPs. The pathological micrographs of lungs derived from rats collected after the intratracheal instillation with a solution containing 0.5 mg/kg and 2.5 mg/kg IOSi-NPs show that the lung has preserved the architecture of the control specimen with no significant differences. However, even at concentrations of 5 mg/kg, the effect of IOSi-NPS on the lungs was markedly reduced at 7 days posttreatment.
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28
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Al Faraj A, Shaik AS, Afzal S, Al Sayed B, Halwani R. MR imaging and targeting of a specific alveolar macrophage subpopulation in LPS-induced COPD animal model using antibody-conjugated magnetic nanoparticles. Int J Nanomedicine 2014; 9:1491-503. [PMID: 24711699 PMCID: PMC3969341 DOI: 10.2147/ijn.s59394] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Purpose Targeting and noninvasive imaging of a specific alveolar macrophage subpopulation in the lung has revealed the importance for early and better diagnosis and therapy of chronic obstructive pulmonary disease (COPD). In this study, the in vivo effect of pulmonary administration of iron oxide nanoparticles on the polarization profile of macrophages was assessed, and a noninvasive free-breathing magnetic resonance imaging (MRI) protocol coupled with the use of biocompatible antibody-conjugated superparamagnetic iron oxide (SPIO) nanoparticles was developed to enable specific targeting and imaging of a particular macrophage subpopulation in lipopolysaccharide-induced COPD mice model. Materials and methods Enzyme-linked immunosorbent assay, Real-time polymerase chain reaction, and flow cytometry analysis were performed to assess the biocompatibility of PEGylated dextran-coated SPIO nanoparticles. Specific biomarkers for M1 and M2 macrophages subsets were selected for conjugation with magnetic nanoparticles. MRI protocol using ultra-short echo time sequence was optimized to enable simultaneous detection of inflammation progress in the lung and detection of macrophages subsets. Flow cytometry and immunohistochemistry analysis were finally performed to confirm MRI readouts and to characterize the polarization profile of targeted macrophages. Results The tested SPIO nanoparticles, under the current experimental conditions, were found to be biocompatible for lung administration in preclinical settings. Cluster of differentiation (CD)86- and CD206-conjugated magnetic nanoparticles enabled successful noninvasive detection of M1 and M2 macrophage subpopulations, respectively, and were found to co-localize with inflammatory regions induced by lipopolysaccharide challenge. No variation in the polarization profile of targeted macrophages was observed, even though a continuum switch in their polarization might occur. However, further confirmatory studies are required to conclusively establish this observation. Conclusion Coupling of magnetic iron oxide nanoparticles with a specific antibody targeted to a particular macrophage subpopulation could offer a promising strategy for an early and better diagnosis of pulmonary inflammatory diseases using noninvasive MRI.
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Affiliation(s)
- Achraf Al Faraj
- King Saud University, College of Applied Medical Sciences, Department of Radiological Sciences, Molecular and Cellular Imaging Lab, Riyadh, Saudi Arabia
| | - Asma Sultana Shaik
- King Saud University, College of Applied Medical Sciences, Department of Radiological Sciences, Molecular and Cellular Imaging Lab, Riyadh, Saudi Arabia
| | - Sibtain Afzal
- King Saud University, Prince Naif Center for Immunology Research, Asthma Research Chair, College of Medicine, Riyadh, Saudi Arabia
| | - Baraa Al Sayed
- King Saud University, College of Applied Medical Sciences, Department of Radiological Sciences, Molecular and Cellular Imaging Lab, Riyadh, Saudi Arabia
| | - Rabih Halwani
- King Saud University, Prince Naif Center for Immunology Research, Asthma Research Chair, College of Medicine, Riyadh, Saudi Arabia
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Li K, Shen M, Zheng L, Zhao J, Quan Q, Shi X, Zhang G. Magnetic resonance imaging of glioma with novel APTS-coated superparamagnetic iron oxide nanoparticles. NANOSCALE RESEARCH LETTERS 2014; 9:304. [PMID: 24994959 PMCID: PMC4067370 DOI: 10.1186/1556-276x-9-304] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 06/06/2014] [Indexed: 05/09/2023]
Abstract
We report in vitro and in vivo magnetic resonance (MR) imaging of C6 glioma cells with a novel acetylated 3-aminopropyltrimethoxysilane (APTS)-coated iron oxide nanoparticles (Fe3O4 NPs). In the present study, APTS-coated Fe3O4 NPs were formed via a one-step hydrothermal approach and then chemically modified with acetic anhydride to generate surface charge-neutralized NPs. Prussian blue staining and transmission electron microscopy (TEM) data showed that acetylated APTS-coated Fe3O4 NPs can be taken up by cells. Combined morphological observation, cell viability, and flow cytometric analysis of the cell cycle indicated that the acetylated APTS-coated Fe3O4 NPs did not significantly affect cell morphology, viability, or cell cycle, indicating their good biocompatibility. Finally, the acetylated APTS-coated Fe3O4 nanoparticles were used in magnetic resonance imaging of C6 glioma. Our results showed that the developed acetylated APTS-coated Fe3O4 NPs can be used as an effective labeling agent to detect C6 glioma cells in vitro and in vivo for MR imaging. The results from the present study indicate that the developed acetylated APTS-coated Fe3O4 NPs have a potential application in MR imaging.
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Affiliation(s)
- Kangan Li
- Department of Radiology, Shanghai First People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200080, People’s Republic of China
| | - Mingwu Shen
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Linfeng Zheng
- Department of Radiology, Shanghai First People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200080, People’s Republic of China
| | - Jinglong Zhao
- Department of Radiology, Shanghai First People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200080, People’s Republic of China
| | - Qimeng Quan
- Department of Radiology, Shanghai First People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200080, People’s Republic of China
| | - Xiangyang Shi
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People’s Republic of China
| | - Guixiang Zhang
- Department of Radiology, Shanghai First People’s Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200080, People’s Republic of China
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Khurana A, Chapelin F, Beck G, Lenkov OD, Donig J, Nejadnik H, Messing S, Derugin N, Chan RCF, Gaur A, Sennino B, McDonald DM, Kempen PJ, Tikhomirov GA, Rao J, Daldrup-Link HE. Iron administration before stem cell harvest enables MR imaging tracking after transplantation. Radiology 2013; 269:186-97. [PMID: 23850832 DOI: 10.1148/radiol.13130858] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
PURPOSE To determine whether intravenous ferumoxytol can be used to effectively label mesenchymal stem cells (MSCs) in vivo and can be used for tracking of stem cell transplants. MATERIALS AND METHODS This study was approved by the institutional animal care and use committee. Sprague-Dawley rats (6-8 weeks old) were injected with ferumoxytol 48 hours prior to extraction of MSCs from bone marrow. Ferumoxytol uptake by these MSCs was evaluated with fluorescence, confocal, and electron microscopy and compared with results of traditional ex vivo-labeling procedures. The in vivo-labeled cells were subsequently transplanted in osteochondral defects of 14 knees of seven athymic rats and were evaluated with magnetic resonance (MR) imaging up to 4 weeks after transplantation. T2 relaxation times of in vivo-labeled MSC transplants and unlabeled control transplants were compared by using t tests. MR data were correlated with histopathologic results. RESULTS In vivo-labeled MSCs demonstrated significantly higher ferumoxytol uptake compared with ex vivo-labeled cells. With electron microscopy, iron oxide nanoparticles were localized in secondary lysosomes. In vivo-labeled cells demonstrated significant T2 shortening effects in vitro and in vivo when they were compared with unlabeled control cells (T2 in vivo, 15.4 vs 24.4 msec; P < .05) and could be tracked in osteochondral defects for 4 weeks. Histologic examination confirmed the presence of iron in labeled transplants and defect remodeling. CONCLUSION Intravenous ferumoxytol can be used to effectively label MSCs in vivo and can be used for tracking of stem cell transplants with MR imaging. This method eliminates risks of contamination and biologic alteration of MSCs associated with ex vivo-labeling procedures.
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Affiliation(s)
- Aman Khurana
- Department of Radiology and Molecular Imaging Program at Stanford, Stanford University School of Medicine, 725 Welch Rd, Room 1665, Stanford, CA 94305-5654; Department of Communication and Statistics and Department of Materials Science and Engineering, Stanford University, Stanford, Calif; Department of Neurology, Comprehensive Cancer Center, Cardiovascular Research Institute and Department of Anatomy, University of California San Francisco, San Francisco, Calif
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Al Faraj A, Luciani N, Kolosnjaj-Tabi J, Mattar E, Clement O, Wilhelm C, Gazeau F. Real-time high-resolution magnetic resonance tracking of macrophage subpopulations in a murine inflammation model: a pilot study with a commercially available cryogenic probe. CONTRAST MEDIA & MOLECULAR IMAGING 2013; 8:193-203. [PMID: 23281292 DOI: 10.1002/cmmi.1516] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 09/12/2012] [Accepted: 10/10/2012] [Indexed: 12/14/2022]
Abstract
Macrophages present different polarization states exhibiting distinct functions in response to environmental stimuli. However, the dynamic of their migration to sites of inflammation is not fully elucidated. Here we propose a real-time in vivo cell tracking approach, using high-resolution (HR)-MRI obtained with a commercially available cryogenic probe (Cryoprobe™), to monitor trafficking of differently polarized macrophages after systemic injection into mice. Murine bone marrow-derived mononuclear cells were differentiated ex vivo into nonpolarized M0, pro-inflammatory M1 and immunomodulator M2 macrophage subsets and labeled with citrate-coated anionic iron oxide nanoparticles (AMNP). These cells were subsequently intravenously injected to mice bearing calf muscle inflammation. Whole body migration dynamics of macrophage subsets was monitored by MRI at 4.7 T with a volume transmission/reception radiofrequency coil and macrophage infiltration to the inflamed paw was monitored with the cryogenic probe, allowing 3D spatial resolution of 50 µm with a scan time of only 10 min. Capture of AMNP was rapid and efficient regardless of macrophage polarization, with the highest uptake in M2 macrophages. Flow cytometry confirmed that macrophages preserved their polarization hallmarks after labeling. Migration kinetics of labeled cells differed from that of free AMNP. A preferential homing of M2-polarized macrophages to inflammation sites was observed. Our in vivo HR-MRI protocol highlights the extent of macrophage infiltration to the inflammation site. Coupled to whole body imaging, HR-MRI provides quantitative information on the time course of migration of ex vivo-polarized intravenously injected macrophages.
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Affiliation(s)
- Achraf Al Faraj
- Laboratoire Matière et Systèmes Complexes MSC, CNRS UMR7057, Université Paris Diderot, Paris, France
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Khurana A, Nejadnik H, Chapelin F, Lenkov O, Gawande R, Lee S, Gupta SN, Aflakian N, Derugin N, Messing S, Lin G, Lue TF, Pisani L, Daldrup-Link HE. Ferumoxytol: a new, clinically applicable label for stem-cell tracking in arthritic joints with MRI. Nanomedicine (Lond) 2013; 8:1969-83. [PMID: 23534832 DOI: 10.2217/nnm.12.198] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
AIM To develop a clinically applicable MRI technique for tracking stem cells in matrix-associated stem-cell implants, using the US FDA-approved iron supplement ferumoxytol. MATERIALS & METHODS Ferumoxytol-labeling of adipose-derived stem cells (ADSCs) was optimized in vitro. A total of 11 rats with osteochondral defects of both femurs were implanted with ferumoxytol- or ferumoxides-labeled or unlabeled ADSCs, and underwent MRI up to 4 weeks post matrix-associated stem-cell implant. The signal-to-noise ratio of different matrix-associated stem-cell implant was compared with t-tests and correlated with histopathology. RESULTS An incubation concentration of 500 µg iron/ml ferumoxytol and 10 µg/ml protamine sulfate led to significant cellular iron uptake, T2 signal effects and unimpaired ADSC viability. In vivo, ferumoxytol- and ferumoxides-labeled ADSCs demonstrated significantly lower signal-to-noise ratio values compared with unlabeled controls (p < 0.01). Histopathology confirmed engraftment of labeled ADSCs, with slow dilution of the iron label over time. CONCLUSION Ferumoxytol can be used for in vivo tracking of stem cells with MRI.
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Affiliation(s)
- Aman Khurana
- Department of Radiology & Molecular Imaging Program at Stanford, Stanford University, Stanford, CA, USA
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Sundstrøm T, Daphu I, Wendelbo I, Hodneland E, Lundervold A, Immervoll H, Skaftnesmo KO, Babic M, Jendelova P, Sykova E, Lund-Johansen M, Bjerkvig R, Thorsen F. Automated Tracking of Nanoparticle-labeled Melanoma Cells Improves the Predictive Power of a Brain Metastasis Model. Cancer Res 2013; 73:2445-56. [DOI: 10.1158/0008-5472.can-12-3514] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Raschzok N, Morgül MH, Stelter L, Sauer IM. Noninvasive monitoring of liver cell transplantation. ACTA ACUST UNITED AC 2013. [DOI: 10.2217/iim.13.2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dadashzadeh ER, Hobson M, Bryant LH, Dean DD, Frank JA. Rapid spectrophotometric technique for quantifying iron in cells labeled with superparamagnetic iron oxide nanoparticles: potential translation to the clinic. CONTRAST MEDIA & MOLECULAR IMAGING 2013; 8:50-6. [PMID: 23109392 PMCID: PMC3490434 DOI: 10.1002/cmmi.1493] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Labeling cells with superparamagnetic iron oxide (SPIO) nanoparticles provides the ability to track cells by magnetic resonance imaging. Quantifying intracellular iron concentration in SPIO labeled cells would allow for the comparison of agents and techniques used to magnetically label cells. Here we describe a rapid spectrophotometric technique (ST) to quantify iron content of SPIO-labeled cells, circumventing the previous requirement of an overnight acid digestion. Following lysis with 10% sodium dodecyl sulfate (SDS) of magnetically labeled cells, quantification of SPIO doped or labeled cells was performed using commonly available spectrophotometric instrument(s) by comparing absorptions at 370 and 750 nm with correction for turbidity of cellular products to determine the iron content of each sample. Standard curves demonstrated high linear correlation (R(2) = 0.998) between absorbance spectra of iron oxide nanoparticles and concentration in known SPIO-doped cells. Comparisons of the ST with inductively coupled plasma-mass spectroscopy (ICP-MS) or nuclear magnetic resonance relaxometric (R(2)) determinations of intracellular iron contents in SPIO containing samples resulted in significant linear correlation between the techniques (R(2) vs ST, R(2) > 0.992, p < 0.0001; ST vs ICP-MS, R(2) > 0.995, p < 0.0001) with the limit of detection of ST for iron = 0.66 µg ml(-1) for 10(6) cells ml(-1). We have developed a rapid straightforward protocol that does not require overnight acid digestion for quantifying iron oxide content in magnetically labeled cells using readily available analytic instrumentation that should greatly expedite advances in comparing SPIO agents and protocols for labeling cells.
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Affiliation(s)
- Esmaeel R. Dadashzadeh
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
- Howard Hughes Medical Scholar, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
| | - Matthew Hobson
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
| | - L. Henry Bryant
- Laboratory of Diagnostic Radiology Research, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
| | - Dana D. Dean
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
| | - Joseph A. Frank
- Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
- Laboratory of Diagnostic Radiology Research, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, Maryland 20892
- Intramural Research Program, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland 20892
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Guenoun J, Ruggiero A, Doeswijk G, Janssens RC, Koning GA, Kotek G, Krestin GP, Bernsen MR. In vivoquantitative assessment of cell viability of gadolinium or iron-labeled cells using MRI and bioluminescence imaging. CONTRAST MEDIA & MOLECULAR IMAGING 2012; 8:165-74. [DOI: 10.1002/cmmi.1513] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 08/21/2012] [Accepted: 09/10/2012] [Indexed: 01/09/2023]
Affiliation(s)
- Jamal Guenoun
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Alessandro Ruggiero
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gabriela Doeswijk
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Roel C. Janssens
- Department of Genetics; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gerben A. Koning
- Laboratory of Experimental Surgical Oncology, Section Surgical Oncology, Department of Surgery; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gyula Kotek
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gabriel P. Krestin
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
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Arbab AS, Thiffault C, Navia B, Victor SJ, Hong K, Zhang L, Jiang Q, Varma NR, Iskander A, Chopp M. Tracking of In-111-labeled human umbilical tissue-derived cells (hUTC) in a rat model of cerebral ischemia using SPECT imaging. BMC Med Imaging 2012; 12:33. [PMID: 23217090 PMCID: PMC3538050 DOI: 10.1186/1471-2342-12-33] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Accepted: 11/29/2012] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND In order to increase understanding of how infused cells work, it becomes important to track their initial movement, localization, and engraftment efficiency following transplantation. However, the available in vivo cell tracking techniques are suboptimal. The study objective was to determine the biodistribution of intravenously administered Indium-111 (In-111) oxine labeled human umbilical tissue-derived cells (hUTC) in a rat model of transient middle cerebral occlusion (tMCAo) using single photon emission computed tomography (SPECT). METHODS Rats received 3 million In-111 labeled hUTC (i.v.) 48 hrs after tMCAo. Following the administration of either hUTC or equivalent dose of In-111-oxine (18.5 MBq), animals underwent SPECT imaging on days 0, 1, and 3. Radioactivity in various organs as well as in the stroke area and contralateral hemisphere was determined, decay corrected and normalized to the total (whole body including head) radioactivity on day 0. Immunohistochemical analysis was also performed to confirm the beneficial effects of hUTC on vascular and synaptic density, and apoptosis. RESULTS Most of the radioactivity (43.36±23.07% on day 0) trafficked to the lungs immediately following IV administration of In-111 labeled hUTC (day 0) and decreased drastically to 8.81±7.75 and 4.01±4.52% on days 1 and 3 post-injection, respectively. In contrast, radioactivity measured in the lung of animals that received In-111-oxine alone remained relatively unchanged from day 0 to day 1 (18.38±5.45% at day 0 to 12.59±5.94%) and decreased to 8.34±4.25% on day 3. Significantly higher radioactivity was observed in stroke areas of animals that received In-111 labeled hUTC indicating the presence of cells at the site of injury representing approximately 1% of total administered dose. In addition, there was significant increase in vascular and synaptophysin immunoreactivity in stroke areas of rats that received In-111 labeled hUTC. CONCLUSIONS The present studies showed the tracking of In-111 labeled hUTC to the sites of stroke in a rat model of tMCAo using SPECT. Animals treated with In-111 labeled hUTC showed histological improvements, with higher vascular and synaptic densities observed in the ischemic boundary zone (IBZ).
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Affiliation(s)
- Ali S Arbab
- Department of Radiology, Cellular and Molecular Imaging Laboratory, Henry Ford Hospital, Detroit, MI 48202, USA.
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Mitsiadis TA, Woloszyk A, Jiménez-Rojo L. Nanodentistry: combining nanostructured materials and stem cells for dental tissue regeneration. Nanomedicine (Lond) 2012; 7:1743-53. [DOI: 10.2217/nnm.12.146] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Regenerative dentistry represents an attractive multidisciplinary therapeutic approach that complements traditional restorative/surgery techniques and benefits from recent advances in stem cell biology, molecular biology, genomics and proteomics. Materials science is important in such advances to move regenerative dentistry from the laboratory to the clinic. The design of novel nanostructured materials, such as biomimetic matrices and scaffolds for controlling cell fate and differentiation, and nanoparticles for diagnostics, imaging and targeted treatment, is needed. The combination of nanotechnology, which allows the creation of sophisticated materials with exquisite fine structural detail, and stem cell biology turns out to be increasingly useful in regenerative medicine. The administration to patients of dynamic biological agents comprising stem cells, bioactive scaffolds and/or nanoparticles will certainly increase the regenerative impact of dental pathological tissues. This overview briefly describes some of the actual benefits and future possibilities of nanomaterials in the emerging field of stem cell-based regenerative dentistry.
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Affiliation(s)
- Thimios A Mitsiadis
- Institute of Oral Biology, Department of Orofacial Development & Regeneration, ZZM, Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | - Anna Woloszyk
- Institute of Oral Biology, Department of Orofacial Development & Regeneration, ZZM, Faculty of Medicine, University of Zurich, Zurich, Switzerland
| | - Lucia Jiménez-Rojo
- Institute of Oral Biology, Department of Orofacial Development & Regeneration, ZZM, Faculty of Medicine, University of Zurich, Zurich, Switzerland
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Tülpar S, Poyrazoğlu MH, Özbilge H, Baştuğ F, Gündüz Z, Torun YA, Kaya EG, Akgün H, Dursun I, Düşünsel R. Modulation of inflammation by mesenchymal stem cell transplantation in peritoneal dialysis in rats. Ren Fail 2012; 34:1317-23. [PMID: 23025458 DOI: 10.3109/0886022x.2012.725290] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
AIM The purpose of this study was to determine the effect of mesenchymal stem cell (MSC) transplantation on the peritoneal morphology and inflammation markers in rat models of peritoneal dialysis (PD). MATERIALS AND METHODS Wistar albino rats were divided into two groups: control (C) (n = 8) and experimental groups (n = 50). PD solution was given to the experimental group during 6 weeks. Then, experimental group was divided into three groups as PD, MSC, and placebo (P) groups. MSC group was treated with MSC (1.5 × 10(6) cells/kg) and P group was treated with phosphate buffer solution via intraperitoneal injection. Evaluation was performed to C and PD groups at the end of 6 weeks and to MSC and P groups at second and third week of the treatment (MSC-2, P-2, MSC-3, and P-3 groups). RESULTS The submesothelial area was significantly thickened in PD and P groups compared to C and MSC groups. Peritoneal fibrosis was seen in P-3 group but not in MSC group. There were no significant differences between the MSC-3 and C groups according to morphological findings. Levels of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) were significantly increased in MSC-2 group compared to the other groups (p-values ranged from 0.0001 to 0.04). TNF-α and IL-6 levels in MSC-3 and P-3 groups were lower than PD and C groups (p < 0.0001 for TNF-α and p = 0.0001-0.002 for IL-6). CONCLUSION Giving MSC may protect the peritoneal membrane from the deleterious effect of PD and extend the life of the peritoneal membrane. Our study is the first on this issue and more detailed studies are needed.
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Affiliation(s)
- Sebahat Tülpar
- Department of Pediatric Nephrology, Erciyes University Faculty of Medicine, Kayseri, Turkey.
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Zhang XQ, Xu X, Bertrand N, Pridgen E, Swami A, Farokhzad OC. Interactions of nanomaterials and biological systems: Implications to personalized nanomedicine. Adv Drug Deliv Rev 2012; 64:1363-84. [PMID: 22917779 DOI: 10.1016/j.addr.2012.08.005] [Citation(s) in RCA: 236] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 07/25/2012] [Accepted: 08/09/2012] [Indexed: 12/16/2022]
Abstract
The application of nanotechnology to personalized medicine provides an unprecedented opportunity to improve the treatment of many diseases. Nanomaterials offer several advantages as therapeutic and diagnostic tools due to design flexibility, small sizes, large surface-to-volume ratio, and ease of surface modification with multivalent ligands to increase avidity for target molecules. Nanomaterials can be engineered to interact with specific biological components, allowing them to benefit from the insights provided by personalized medicine techniques. To tailor these interactions, a comprehensive knowledge of how nanomaterials interact with biological systems is critical. Herein, we discuss how the interactions of nanomaterials with biological systems can guide their design for diagnostic, imaging and drug delivery purposes. A general overview of nanomaterials under investigation is provided with an emphasis on systems that have reached clinical trials. Finally, considerations for the development of personalized nanomedicines are summarized such as the potential toxicity, scientific and technical challenges in fabricating them, and regulatory and ethical issues raised by the utilization of nanomaterials.
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Sztriha LK, O'Gorman RL, Modo M, Barker GJ, Williams SCR, Kalra L. Monitoring brain repair in stroke using advanced magnetic resonance imaging. Stroke 2012; 43:3124-31. [PMID: 23010674 DOI: 10.1161/strokeaha.111.649244] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Laszlo K Sztriha
- Department of clinical Neuroscience, Institute of Psychiatry, King's College London, Denmark Hill, SE5 8AF, London, UK.
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Abstract
During the past two decades, stem cells have created enthusiasm as a regenerative therapy for ischemic heart disease. Transplantation of bone marrow stem cells, skeletal myoblasts, and endothelial progenitor cells has shown to improve myocardial function after infarction. Recently, attention has focused on the potential use of embryonic stem cells and induced pluripotent stem cells because they possess the capacity to differentiate into various cell types, including cardiac and endothelial cells. Clinical trials have shown positive effects on the functional recovery of heart after myocardial infarction and have answered questions on timing, dosage, and cell delivery route of stem cells such as those derived from bone marrow. Despite the current advances in stem cell research, one main hurdle remains the lack of reliable information about the fate of cell engraftment, survival, and proliferation after transplantation. This review discusses the different cell types used in cardiac cell therapy as well as molecular imaging modalities relevant to survival issues.
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Umbilical cord blood mononuclear cell transplantation for neonatal hypoxic-ischemic encephalopathy. Pediatr Res 2012; 71:464-73. [PMID: 22430382 DOI: 10.1038/pr.2011.59] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Despite recent advances in the treatment of neonatal hypoxic-ischemic encephalopathy (HIE) using therapeutic hypothermia, at least 30% of the cooled infants will die or have moderate/severe neurological disability. Umbilical cord blood cells (UCBCs), which are readily available at birth, have been shown to reduce sensorimotor and/or cognitive impairments in several models of brain damage, representing a promising option for the treatment of neurological diseases. In this review, we discuss recent preclinical studies that assessed the effects of UCBC transplantation in the Rice-Vannucci animal model of HIE. We also review the possible cell types and mechanisms involved in the therapeutic effect of UCBC transplantation, including neuroprotection, immunomodulation, and stimulation of neural plasticity and regeneration. In addition, we discuss how neuroimaging methods, such as bioluminescence imaging, nuclear-medicine imaging, or magnetic resonance imaging, could be used to evaluate the biodistribution of UCBCs in both preclinical and clinical studies.
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Al Faraj A, Gazeau F, Wilhelm C, Devue C, Guérin CL, Péchoux C, Paradis V, Clément O, Boulanger CM, Rautou PE. Endothelial Cell–derived Microparticles Loaded with Iron Oxide Nanoparticles: Feasibility of MR Imaging Monitoring in Mice. Radiology 2012; 263:169-78. [DOI: 10.1148/radiol.11111329] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Thu MS, Bryant LH, Coppola T, Jordan EK, Budde MD, Lewis BK, Chaudhry A, Ren J, Varma NRS, Arbab AS, Frank JA. Self-assembling nanocomplexes by combining ferumoxytol, heparin and protamine for cell tracking by magnetic resonance imaging. Nat Med 2012; 18:463-7. [PMID: 22366951 PMCID: PMC3296876 DOI: 10.1038/nm.2666] [Citation(s) in RCA: 162] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 08/04/2011] [Indexed: 12/11/2022]
Abstract
We report on a novel and straightforward magnetic cell labeling approach that combines three FDA-approved drugs, ferumoxytol (F), heparin (H) and protamine (P) in serum free media to form self-assembling nanocomplexes that effectively label cells for in vivo MRI. We observed that the HPF nanocomplexes were stable in serum free cell culture media. HPF nanocomplexes exhibited a three-fold increase in T2 relaxivity compared to F. Electron Microscopy revealed internalized HPF within endosomes, confirmed by Prussian blue staining of labeled cells. There was no long-term effect or toxicity on cellular physiology or function of HPF-labeled hematopoietic stem cells, bone marrow stromal cells, neural stem cells, and T-cells when compared to controls. In vivo MRI detected 1000 HPF-labeled cells implanted in rat brains. HPF labeling method should facilitate the monitoring by MRI of infused or implanted cells in clinical trials.
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Affiliation(s)
- Mya S Thu
- Frank Laboratory and Laboratory of Diagnostic Radiology Research, Department of Radiology and Imaging Sciences, US National Institutes of Health, Bethesda, Maryland, USA
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Varma NRS, Janic B, Iskander ASM, Shankar A, Bhuiyan MPI, Soltanian-Zadeh H, Jiang Q, Barton K, Ali MM, Arbab AS. Endothelial progenitor cells (EPCs) as gene carrier system for rat model of human glioma. PLoS One 2012; 7:e30310. [PMID: 22276177 PMCID: PMC3262815 DOI: 10.1371/journal.pone.0030310] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Accepted: 12/13/2011] [Indexed: 12/12/2022] Open
Abstract
Background Due to their unique property to migrate to pathological lesions, stem cells are used as a delivery vehicle for therapeutic genes to tumors, especially for glioma. It is critically important to track the movement, localization, engraftment efficiency and functional capability or expression of transgenes of selected cell populations following transplantation. The purposes of this study were to investigate whether 1) intravenously administered, genetically transformed cord blood derived EPCs can carry human sodium iodide symporter (hNIS) to the sites of tumors in rat orthotopic model of human glioma and express transgene products, and 2) whether accumulation of these administered EPCs can be tracked by different in vivo imaging modalities. Methods and Results Collected EPCs were cultured and transduced to carry hNIS. Cellular viability, differential capacity and Tc-99m uptake were determined. Five to ten million EPCs were intravenously administered and Tc-99-SPECT images were acquired on day 8, to determine the accumulation of EPCs and expression of transgenes (increase activity of Tc-99m) in the tumors. Immunohistochemistry was performed to determine endothelial cell markers and hNIS positive cells in the tumors. Transduced EPCs were also magnetically labeled and accumulation of cells was confirmed by MRI and histochemistry. SPECT analysis showed increased activity of Tc-99m in the tumors that received transduced EPCs, indicative of the expression of transgene (hNIS). Activity of Tc-99m in the tumors was also dependent on the number of administered transduced EPCs. MRI showed the accumulation of magnetically labeled EPCs. Immunohistochemical analysis showed iron and hNIS positive and, human CD31 and vWF positive cells in the tumors. Conclusion EPC was able to carry and express hNIS in glioma following IV administration. SPECT detected migration of EPCs and expression of the hNIS gene. EPCs can be used as gene carrier/delivery system for glioma therapy as well as imaging probes.
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Affiliation(s)
- Nadimpalli Ravi S. Varma
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Branislava Janic
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - A. S. M. Iskander
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Adarsh Shankar
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Mohammed P. I. Bhuiyan
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Hamid Soltanian-Zadeh
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Quan Jiang
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Kenneth Barton
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Meser M. Ali
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
| | - Ali S. Arbab
- Cellular and Molecular Imaging Laboratory, Department of Radiology, Henry Ford Hospital, Detroit, Michigan, United States of America
- * E-mail:
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48
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Caplan LR, Arenillas J, Cramer SC, Joutel A, Lo EH, Meschia J, Savitz S, Tournier-Lasserve E. Stroke-related translational research. ACTA ACUST UNITED AC 2011; 68:1110-23. [PMID: 21555605 DOI: 10.1001/archneurol.2011.99] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Stroke-related translational research is multifaceted. Herein, we highlight genome-wide association studies and genetic studies of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy, COL4A1 mutations, and cerebral cavernous malformations; advances in molecular biology and biomarkers; newer brain imaging research; and recovery from stroke emphasizing cell-based and other rehabilitative modalities.
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Affiliation(s)
- Louis R Caplan
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.
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Abstract
Cardiac diseases are the leading cause of death and reach epidemic proportions with aging. Advanced heart disease results from an abrupt or progressive loss of contractile cardiomyocytes. Following percutaneous coronary intervention and revascularization regenerative medicine aims at effectively repair damaged tissue and replacement of lost cardiomyocytes. However, mixed results were obtained from trials using bone marrow-derived stem cells. Benefits were rather attributed to paracrine effects leading to inhibition or reverse of negative remodeling processes than to regeneration of viable cardiomyocytes. Thus the aim of regenerative medicine, in particular stem cell research, to generate viable cardiac muscle has so far not been achieved in humans, reflecting our incomplete understanding of underlying biological mechanisms. Moreover, there is growing evidence that substantial person-to-person differences in the outcome of stem cell therapy exists. We here review our present knowledge in evolving stem cell based cardiovascular medicine and highlight personalized aspects of stem cell interventions.
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50
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Savitz SI, Chopp M, Deans R, Carmichael T, Phinney D, Wechsler L. Stem Cell Therapy as an Emerging Paradigm for Stroke (STEPS) II. Stroke 2011; 42:825-9. [PMID: 21273569 DOI: 10.1161/strokeaha.110.601914] [Citation(s) in RCA: 190] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cell-based therapies represent a new therapeutic approach for stroke. In 2007, investigators from academia, industry leaders, and members of the National Institutes of Health crafted recommendations to facilitate the translational development of cellular therapies as a novel, emerging modality for stroke from animal studies to clinical trials. This meeting was called Stem Cell Therapies as an Emerging Paradigm in Stroke (STEPS) and was modeled on the format of the Stroke Therapy Academic Industry Roundtable (STAIR) meetings. Since publication of the original STEPS guidelines, there has been an explosive growth in the number of cellular products and in the number of new laboratory discoveries that impact the safety and potential efficacy of cell therapies for stroke. Any successful development of a cell product will need to take into consideration several factors, including the preclinical safety and efficacy profile, cell characterization, delivery route, in vivo biodistribution, and mechanism of action. In 2010, a second meeting called STEPS 2 was held to bring together clinical and basic science researchers with industry, regulatory, and National Institutes of Health representatives. At this meeting, participants identified critical gaps in knowledge and research areas that require further studies, updated prior guidelines, and drafted new recommendations to create a framework to guide future investigations in cell-based therapies for stroke.
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Affiliation(s)
- Sean I Savitz
- Department of Neurology, University of Texas Medical School at Houston, Houston, TX 77030, USA.
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