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Muñoz‐Ortiz T, Hu J, Ortgies DH, Shrikhande S, Zamora‐Perez P, Granado M, González‐Hedström D, Fuente‐Fernández M, García‐Villalón ÁL, Andrés‐Delgado L, Martín Rodríguez E, Aguilar R, Alfonso F, García Solé J, Rivera Gil P, Jaque D, Rivero F. Molecular Imaging of Infarcted Heart by Biofunctionalized Gold Nanoshells. Adv Healthc Mater 2021; 10:e2002186. [PMID: 33594792 DOI: 10.1002/adhm.202002186] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Indexed: 01/03/2023]
Abstract
The unique combination of physical and optical properties of silica (core)/gold (shell) nanoparticles (gold nanoshells) makes them especially suitable for biomedicine. Gold nanoshells are used from high-resolution in vivo imaging to in vivo photothermal tumor treatment. Furthermore, their large scattering cross-section in the second biological window (1000-1700 nm) makes them also especially adequate for molecular optical coherence tomography (OCT). In this work, it is demonstrated that, after suitable functionalization, gold nanoshells in combination with clinical OCT systems are capable of imaging damage in the myocardium following an infarct. Since both inflammation and apoptosis are two of the main mechanisms underlying myocardial damage after ischemia, such damage imaging is achieved by endowing gold nanoshells with selective affinity for the inflammatory marker intercellular adhesion molecule 1 (ICAM-1), and the apoptotic marker phosphatidylserine. The results here presented constitute a first step toward a fast, safe, and accurate diagnosis of damaged tissue within infarcted hearts at the molecular level by means of the highly sensitive OCT interferometric technique.
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Affiliation(s)
- Tamara Muñoz‐Ortiz
- Nanomaterials for Bioimaging Group Departamento de Física de Materiales Universidad Autónoma de Madrid C/ Francisco Tomás y Valiente 7 Madrid 28049 Spain
| | - Jie Hu
- Xiamen Institute of Rare‐earth Materials, Haixi Institutes Chinese Academy of Sciences 258 Duishanxiheng Road, Jimei District Xiamen Fujian 361024 China
| | - Dirk H. Ortgies
- Nanomaterials for Bioimaging Group Departamento de Física de Materiales Universidad Autónoma de Madrid C/ Francisco Tomás y Valiente 7 Madrid 28049 Spain
- Instituto Ramón y Cajal de Investigación Sanitaria Hospital Ramón y Cajal Ctra. Colmenar km. 9,100 Madrid 28034 Spain
| | - Shreya Shrikhande
- Integrative Biomedical Materials and Nanomedicine Lab Department of Experimental and Health Sciences Pompeu Fabra University Carrer Doctor Aiguader 88 Barcelona 08003 Spain
| | - Paula Zamora‐Perez
- Integrative Biomedical Materials and Nanomedicine Lab Department of Experimental and Health Sciences Pompeu Fabra University Carrer Doctor Aiguader 88 Barcelona 08003 Spain
| | - Miriam Granado
- Nanomaterials for Bioimaging Group Departamento de Fisiología Facultad de Medicina Universidad Autónoma de Madrid C/ Arzobispo Morcillo s/n Madrid 28029 Spain
| | - Daniel González‐Hedström
- Nanomaterials for Bioimaging Group Departamento de Fisiología Facultad de Medicina Universidad Autónoma de Madrid C/ Arzobispo Morcillo s/n Madrid 28029 Spain
| | - María Fuente‐Fernández
- Nanomaterials for Bioimaging Group Departamento de Fisiología Facultad de Medicina Universidad Autónoma de Madrid C/ Arzobispo Morcillo s/n Madrid 28029 Spain
| | - Ángel Luis García‐Villalón
- Nanomaterials for Bioimaging Group Departamento de Fisiología Facultad de Medicina Universidad Autónoma de Madrid C/ Arzobispo Morcillo s/n Madrid 28029 Spain
| | - Laura Andrés‐Delgado
- Departamento de Anatomía Histología y Neurociencia Facultad de Medicina. Universidad Autónoma de Madrid. C/ Arzobispo Morcillo s/n Madrid 28029 Spain
| | - Emma Martín Rodríguez
- Instituto Ramón y Cajal de Investigación Sanitaria Hospital Ramón y Cajal Ctra. Colmenar km. 9,100 Madrid 28034 Spain
- Nanomaterials for Bioimaging Group Departamento de Física Aplicada Universidad Autónoma de Madrid C/ Francisco Tomás y Valiente 7 Madrid 28049 Spain
| | - Río Aguilar
- Cardiology Department Hospital Universitario de la Princesa Instituto Investigación Sanitaria Princesa (IIS‐IP) CIBER‐CV Universidad Autónoma de Madrid Calle Diego de León, 62 Madrid 28006 Spain
| | - Fernando Alfonso
- Cardiology Department Hospital Universitario de la Princesa Instituto Investigación Sanitaria Princesa (IIS‐IP) CIBER‐CV Universidad Autónoma de Madrid Calle Diego de León, 62 Madrid 28006 Spain
| | - José García Solé
- Nanomaterials for Bioimaging Group Departamento de Física de Materiales Universidad Autónoma de Madrid C/ Francisco Tomás y Valiente 7 Madrid 28049 Spain
| | - Pilar Rivera Gil
- Integrative Biomedical Materials and Nanomedicine Lab Department of Experimental and Health Sciences Pompeu Fabra University Carrer Doctor Aiguader 88 Barcelona 08003 Spain
| | - Daniel Jaque
- Nanomaterials for Bioimaging Group Departamento de Física de Materiales Universidad Autónoma de Madrid C/ Francisco Tomás y Valiente 7 Madrid 28049 Spain
- Instituto Ramón y Cajal de Investigación Sanitaria Hospital Ramón y Cajal Ctra. Colmenar km. 9,100 Madrid 28034 Spain
| | - Fernando Rivero
- Cardiology Department Hospital Universitario de la Princesa Instituto Investigación Sanitaria Princesa (IIS‐IP) CIBER‐CV Universidad Autónoma de Madrid Calle Diego de León, 62 Madrid 28006 Spain
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Singh MR, Persaud PD, Yastrebov S. A study of two-photon florescence in metallic nanoshells. NANOTECHNOLOGY 2020; 31:265203. [PMID: 32197263 DOI: 10.1088/1361-6528/ab81c9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A theory of the two-photon florescence for a metallic nanoshell in the presence of quantum emitters has been developed. The metallic nanoshell is made of a metallic nanosphere as a core and a dielectric material as a shell. An ensemble of quantum emitters is deposited on the surface of the dielectric shell. A probe field is applied to study the two-photon process in the metallic nanoshell. Surface plasmon polaritons are created at the interface between the core and shell due to coupling between probe photons and surface plasmons present at the surface of the metallic nanosphere. The intensity of the surface plasmon polariton field is huge when the probe photon energy is in resonance with the polariton resonance energy. Induced electric dipoles are created in each quantum emitter due to the surface plasmon polariton field and the probe field. Dipoles in quantum emitters interact with each other via the dipole-dipole interaction. The dipole-dipole interaction is calculated using the many-body theory and mean field approximation. It is found that the dipole-dipole interaction has new term which is induced by the surface plasmon polariton field. An analytical expression of the two-photon florescence is derived in the presence the dipole-dipole interaction. Our theory predicts that the intensity of the two-photon florescence is enhanced in the presence of quantum emitters relative to the florescence of the metallic nanoshell in isolation. Physics behind the enhancement is the presence of the dipole-dipole interaction between the ensemble of quantum emitters. It is also found that as the concentration of quantum emitters increases, the dipole-dipole field also increases. This in turn, increases the two-photon florescence as function of the concentration. Finally, we have compared our theory with experiments of a metallic nanoshell which is made for Au nanosphere core and the SiO2 shell. The metallic nanoshell is surrounded by various concentrations of Cadmium-Selenium quantum dots as quantum emitters. A good agreement between theory and experiment is found.
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Affiliation(s)
- Mahi R Singh
- Department of Physics and Astronomy, The University of Western Ontario, London N6A 3K7, Canada. F Ioffe Physical-Technical Institute Laboratory of Electrical and Optical Phenomena in Semiconductors, St Petersburg 194021, Russia
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Sharifi M, Attar F, Saboury AA, Akhtari K, Hooshmand N, Hasan A, El-Sayed MA, Falahati M. Plasmonic gold nanoparticles: Optical manipulation, imaging, drug delivery and therapy. J Control Release 2019; 311-312:170-189. [PMID: 31472191 DOI: 10.1016/j.jconrel.2019.08.032] [Citation(s) in RCA: 142] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 08/25/2019] [Accepted: 08/26/2019] [Indexed: 12/20/2022]
Abstract
Over the past two decades, the development of plasmonic nanoparticle (NPs), especially gold (Au) NPs, is being pursued more seriously in the medical fields such as imaging, drug delivery, and theranostic systems. However, there is no comprehensive review on the effect of the physical and chemical parameters of AuNPs on their plasmonic properties as well as the use of these unique characteristic in medical activities such as imaging and therapeutics. Therefore, in this literature the surface plasmon resonance (SPR) modeling of AuNPs was accurately captured toward precision medicine. Indeed, we investigated the importance of plasmonic properties of AuNPs in optical manipulation, imaging, drug delivery, and photothermal therapy (PTT) of cancerous cells based on their physicochemical properties. Finally, some challenges regarding the commercialization of AuNPs in future medicine such as, cytotoxicity, lack of standards for medical applications, high cost, and time-consuming process were discussed.
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Affiliation(s)
- Majid Sharifi
- Department of Nanotechnology, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
| | - Farnoosh Attar
- Department of Biology, Faculty of Food Industry & Agriculture, Standard Research Institute, Karaj, Iran
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Keivan Akhtari
- Department of Physics, University of Kurdistan, Sanandaj, Iran
| | - Nasrin Hooshmand
- Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, United States
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha 2713, Qatar; Biomedical Research Center, Qatar University, Doha 2713, Qatar.
| | - Mostafa A El-Sayed
- Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, United States.
| | - Mojtaba Falahati
- Department of Nanotechnology, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
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Small DM, Jones JS, Tendler II, Miller PE, Ghetti A, Nishimura N. Label-free imaging of atherosclerotic plaques using third-harmonic generation microscopy. BIOMEDICAL OPTICS EXPRESS 2018; 9:214-229. [PMID: 29359098 PMCID: PMC5772576 DOI: 10.1364/boe.9.000214] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 11/24/2017] [Accepted: 12/02/2017] [Indexed: 05/18/2023]
Abstract
Multiphoton microscopy using laser sources in the mid-infrared range (MIR, 1,300 nm and 1,700 nm) was used to image atherosclerotic plaques from murine and human samples. Third harmonic generation (THG) from atherosclerotic plaques revealed morphological details of cellular and extracellular lipid deposits. Simultaneous nonlinear optical signals from the same laser source, including second harmonic generation and endogenous fluorescence, resulted in label-free images of various layers within the diseased vessel wall. The THG signal adds an endogenous contrast mechanism with a practical degree of specificity for atherosclerotic plaques that complements current nonlinear optical methods for the investigation of cardiovascular disease. Our use of whole-mount tissue and backward scattered epi-detection suggests THG could potentially be used in the future as a clinical tool.
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Affiliation(s)
- David M. Small
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, 526 N. Campus Rd., Ithaca, NY 14853, USA
- Contributed equally
| | - Jason S. Jones
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, 526 N. Campus Rd., Ithaca, NY 14853, USA
- Contributed equally
| | - Irwin I. Tendler
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, 526 N. Campus Rd., Ithaca, NY 14853, USA
| | - Paul E. Miller
- Anabios Corporation, 3030 Bunker Hill St., San Diego, CA 92109, USA
| | - Andre Ghetti
- Anabios Corporation, 3030 Bunker Hill St., San Diego, CA 92109, USA
| | - Nozomi Nishimura
- Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, 526 N. Campus Rd., Ithaca, NY 14853, USA
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5
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Varna M, Xuan HV, Fort E. Gold nanoparticles in cardiovascular imaging. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2017; 10. [DOI: 10.1002/wnan.1470] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 02/01/2017] [Accepted: 02/25/2017] [Indexed: 01/12/2023]
Affiliation(s)
- Mariana Varna
- Institut LangevinESPCI Paris, CNRS, PSL Research UniversityParisFrance
- Institut Galien Paris‐Sud UMR 8612, CNRSUniversité Paris‐Sud/Paris‐Saclay Faculté de PharmacieChâtenay‐MalabryFrance
| | - Hoa V. Xuan
- Institut LangevinESPCI Paris, CNRS, PSL Research UniversityParisFrance
- Faculty of Physics and TechnologyThai Nguyen University of Science (TNUS)Thai NguyenVietnam
| | - Emmanuel Fort
- Institut LangevinESPCI Paris, CNRS, PSL Research UniversityParisFrance
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Atry F, Pashaie R. Analysis of intermediary scan-lens and tube-lens mechanisms for optical coherence tomography. APPLIED OPTICS 2016; 55:646-53. [PMID: 26836064 DOI: 10.1364/ao.55.000646] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Combining an optical coherence tomography (OCT) scanner with other techniques such as optogenetic neurostimulation or fluorescence imaging requires integrating auxiliary components into the optical path of the setup. Due to the short scanning distance of most OCT objectives, adding scan and tube lenses in the device is essential to open space between the back-focal-plane of the objective and center of mass of the mirrors in the galvanometer. The effect of the scan and tube lenses on the focal spot size of the scanner using off-the-shelf components are theoretically explored for three different designs in this paper. Two lens mechanisms were implemented and tested in a custom-built OCT scanner to experimentally measure point-spread functions. Based on our analysis, proper form of a four-element semi-Plössl lens provides a superior performance compared with an achromatic doublet when used as a scan/tube lens. The former lens design provides close to diffraction-limited resolution for scan angles up to 6.4°; however, due to aberrations in an achromatic doublet, the later design offers diffraction-limited resolution confined to 2° scan angles.
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Wang T, McElroy A, Halaney D, Vela D, Fung E, Hossain S, Phipps J, Wang B, Yin B, Feldman MD, Milner TE. Detection of plaque structure and composition using OCT combined with two-photon luminescence (TPL) imaging. Lasers Surg Med 2015; 47:485-94. [PMID: 26018531 DOI: 10.1002/lsm.22366] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2015] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND OBJECTIVES Atherosclerosis and plaque rupture leads to myocardial infarction and stroke. A novel hybrid optical coherence tomography (OCT) and two-photon luminescence (TPL) fiber-based imaging system was developed to characterize tissue constituents in the context of plaque morphology. STUDY DESIGN/MATERIALS AND METHODS Ex vivo coronary arteries (34 regions of interest) from three human hearts with atherosclerotic plaques were examined by OCT-TPL imaging. Histological sections (4 μm in thickness) were stained with Oil Red O for lipid, Von Kossa for calcium, and Verhoeff-Masson Tri-Elastic for collagen/elastin fibers and compared with imaging results. RESULTS Biochemical components in plaques including lipid, oxidized-LDL, and calcium, as well as a non-tissue component (metal) are distinguished by multi-channel TPL images with statistical significance (P < 0.001). TPL imaging provides complementary optical contrast to OCT (two-photon absorption/emission vs scattering). Merged OCT-TPL images demonstrate the distribution of lipid deposits in registration with detailed plaque surface profile. CONCLUSIONS Results suggest that multi-channel TPL imaging can effectively identify lipid sub-types and different plaque components. Furthermore, fiber-based hybrid OCT-TPL imaging simultaneously detects plaque structure and composition, improving the efficacy of vulnerable plaque detection and characterization.
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Affiliation(s)
- Tianyi Wang
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - Austin McElroy
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - David Halaney
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas.,South Texas Veterans Health Care System, San Antonio, Texas
| | | | - Edmund Fung
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - Shafat Hossain
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - Jennifer Phipps
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas
| | - Bingqing Wang
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - Biwei Yin
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
| | - Marc D Feldman
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas.,South Texas Veterans Health Care System, San Antonio, Texas
| | - Thomas E Milner
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas
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Wang T, McElroy A, Halaney D, Vela D, Fung E, Hossain S, Phipps J, Wang B, Yin B, Feldman MD, Milner TE. Dual-modality fiber-based OCT-TPL imaging system for simultaneous microstructural and molecular analysis of atherosclerotic plaques. BIOMEDICAL OPTICS EXPRESS 2015; 6:1665-78. [PMID: 26137371 PMCID: PMC4467709 DOI: 10.1364/boe.6.001665] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 02/17/2015] [Accepted: 02/17/2015] [Indexed: 05/25/2023]
Abstract
New optical imaging techniques that provide contrast to study both the anatomy and composition of atherosclerotic plaques can be utilized to better understand the formation, progression and clinical complications of human coronary artery disease. We present a dual-modality fiber-based optical imaging system for simultaneous microstructural and molecular analysis of atherosclerotic plaques that combines optical coherence tomography (OCT) and two-photon luminescence (TPL) imaging. Experimental results from ex vivo human coronary arteries show that OCT and TPL optical contrast in recorded OCT-TPL images is complimentary and in agreement with histological analysis. Molecular composition (e.g., lipid and oxidized-LDL) detected by TPL imaging can be overlaid onto plaque microstructure depicted by OCT, providing new opportunities for atherosclerotic plaque identification and characterization.
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Affiliation(s)
- Tianyi Wang
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Austin McElroy
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - David Halaney
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA ; South Texas Veterans Health Care System, San Antonio, Texas 78229, USA
| | - Deborah Vela
- Texas Heart Institute, Houston, Texas 77030, USA
| | - Edmund Fung
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Shafat Hossain
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Jennifer Phipps
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA
| | - Bingqing Wang
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Biwei Yin
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Marc D Feldman
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA ; South Texas Veterans Health Care System, San Antonio, Texas 78229, USA
| | - Thomas E Milner
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
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9
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Phipps JE, Vela D, Hoyt T, Halaney DL, Mancuso JJ, Buja LM, Asmis R, Milner TE, Feldman MD. Macrophages and intravascular OCT bright spots: a quantitative study. JACC Cardiovasc Imaging 2015; 8:63-72. [PMID: 25499133 PMCID: PMC4297553 DOI: 10.1016/j.jcmg.2014.07.027] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 06/25/2014] [Accepted: 07/16/2014] [Indexed: 12/15/2022]
Abstract
OBJECTIVES This study hypothesized that bright spots in intravascular optical coherence tomography (IVOCT) images may originate by colocalization of plaque materials of differing indexes of refraction. To quantitatively identify bright spots, we developed an algorithm that accounts for factors including tissue depth, distance from light source, and signal-to-noise ratio. We used this algorithm to perform a bright spot analysis of IVOCT images and compared these results with histological examination of matching tissue sections. BACKGROUND Bright spots are thought to represent macrophages in IVOCT images, and studies of alternative etiologies have not been reported. METHODS Fresh human coronary arteries (n = 14 from 10 hearts) were imaged with IVOCT in a mock catheterization laboratory and then processed for histological analysis. The quantitative bright spot algorithm was applied to all images. RESULTS Results are reported for 1,599 IVOCT images co-registered with histology. Macrophages alone were responsible for only 23% of the bright spot-positive regions, although they were present in 57% of bright spot-positive regions (as determined by histology). Additional etiologies for bright spots included cellular fibrous tissue (8%), interfaces between calcium and fibrous tissue (10%), calcium and lipids (5%), and fibrous cap and lipid pool (3%). Additionally, we showed that large pools of macrophages in CD68(+) histology sections corresponded to dark regions in comparative IVOCT images; this is due to the fact that a pool of lipid-rich macrophages will have the same index of refraction as a pool of lipid and thus will not cause bright spots. CONCLUSIONS Bright spots in IVOCT images were correlated with a variety of plaque components that cause sharp changes in the index of refraction. Algorithms that incorporate these correlations may be developed to improve the identification of some types of vulnerable plaque and allow standardization of IVOCT image interpretation.
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Affiliation(s)
- Jennifer E Phipps
- University of Texas Health Science Center San Antonio, San Antonio, Texas
| | | | - Taylor Hoyt
- University of Texas Health Science Center San Antonio, San Antonio, Texas
| | - David L Halaney
- University of Texas Health Science Center San Antonio, San Antonio, Texas; Department of Veterans Affairs, South Texas Veterans Health Care System, San Antonio, Texas
| | - J Jacob Mancuso
- University of Texas Health Science Center San Antonio, San Antonio, Texas
| | | | - Reto Asmis
- University of Texas Health Science Center San Antonio, San Antonio, Texas
| | | | - Marc D Feldman
- University of Texas Health Science Center San Antonio, San Antonio, Texas; Department of Veterans Affairs, South Texas Veterans Health Care System, San Antonio, Texas.
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10
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Ramos J, Potta T, Scheideler O, Rege K. Parallel synthesis of poly(amino ether)-templated plasmonic nanoparticles for transgene delivery. ACS APPLIED MATERIALS & INTERFACES 2014; 6:14861-14873. [PMID: 25084138 PMCID: PMC4160262 DOI: 10.1021/am5017073] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 08/01/2014] [Indexed: 06/03/2023]
Abstract
Plasmonic nanoparticles have been increasingly investigated for numerous applications in medicine, sensing, and catalysis. In particular, gold nanoparticles have been investigated for separations, sensing, drug/nucleic acid delivery, and bioimaging. In addition, silver nanoparticles demonstrate antibacterial activity, resulting in potential application in treatments against microbial infections, burns, diabetic skin ulcers, and medical devices. Here, we describe the facile, parallel synthesis of both gold and silver nanoparticles using a small set of poly(amino ethers), or PAEs, derived from linear polyamines, under ambient conditions and in absence of additional reagents. The kinetics of nanoparticle formation were dependent on PAE concentration and chemical composition. In addition, yields were significantly greater in case of PAEs when compared to 25 kDa poly(ethylene imine), which was used as a standard catonic polymer. Ultraviolet radiation enhanced the kinetics and the yield of both gold and silver nanoparticles, likely by means of a coreduction effect. PAE-templated gold nanoparticles demonstrated the ability to deliver plasmid DNA, resulting in transgene expression, in 22Rv1 human prostate cancer and MB49 murine bladder cancer cell lines. Taken together, our results indicate that chemically diverse poly(amino ethers) can be employed for rapidly templating the formation of metal nanoparticles under ambient conditions. The simplicity of synthesis and chemical diversity make PAE-templated nanoparticles useful tools for several applications in biotechnology, including nucleic acid delivery.
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Affiliation(s)
- James Ramos
- Biomedical
Engineering, School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287-6106, United States
| | - Thrimoorthy Potta
- Chemical
Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287-6106, United States
| | - Olivia Scheideler
- Department
of Biological Systems Engineering, University
of Nebraska—Lincoln, Lincoln, Nebraska 68583-0726, United States
| | - Kaushal Rege
- Chemical
Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287-6106, United States
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Ramos J, Rege K. Poly(aminoether)-gold nanorod assemblies for shRNA plasmid-induced gene silencing. Mol Pharm 2013; 10:4107-19. [PMID: 24066795 DOI: 10.1021/mp400080f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Gold nanorods (GNRs) have emerged as promising nanomaterials for biosensing, imaging, photothermal hyperthermia treatments, and therapeutic delivery for several diseases. We generated poly(aminoether)-GNR nanoassemblies using a layer-by-layer deposition approach based on the 1,4C-1,4Bis polymer from a library recently synthesized in our laboratory. Subtoxic concentrations of 1,4C-1,4Bis-GNR nanoassemblies were employed to deliver expression vectors that express shRNA ("shRNA plasmid") against firefly luciferase gene to knock down expression of the protein constitutively expressed in prostate cancer cells. The role of hydrodynamic size and zeta potential in determining nanoassembly mediated luciferase silencing was investigated. Finally, the theranostic potential of 1,4C-1,4Bis-GNR nanoassemblies was demonstrated using live cell two-photon induced luminescence bioimaging. Our results indicate that poly(aminoether)-GNR nanoassemblies are a promising theranostic platform for delivery of therapeutic payloads capable of simultaneous gene silencing and bioimaging.
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Affiliation(s)
- James Ramos
- Biomedical Engineering, School of Biological and Health Systems Engineering and ‡Chemical Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University , 501 E. Tyler Mall, ECG 303, Tempe, Arizona 85287-6106, United States
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Wang T, Halaney D, Ho D, Feldman MD, Milner TE. Two-photon luminescence properties of gold nanorods. BIOMEDICAL OPTICS EXPRESS 2013; 4:584-95. [PMID: 23577293 PMCID: PMC3617720 DOI: 10.1364/boe.4.000584] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 01/26/2013] [Accepted: 01/27/2013] [Indexed: 05/19/2023]
Abstract
Gold nanorods can be internalized by macrophages (an important early cellular marker in atherosclerosis and cancer) and used as an imaging contrast agent for macrophage targeting. Objective of this study is to compare two-photon luminescence (TPL) properties of four aspect ratios of gold nanorods with surface plasmon resonance at 700, 756, 844 and 1060 nm respectively. TPL from single nanorods and Rhodamine 6G particles was measured using a laser-scanning TPL microscope. Nanorod TPL emission spectrum was recorded by a spectrometer. Quadratic dependence of luminescence intensity on excitation power (confirming a TPL process) was observed below a threshold (e.g., <1.6 mW), followed by photobleaching at higher power levels. Dependence of nanorod TPL intensity on excitation wavelength indicated that the two-photon action cross section (TPACS) is plasmon-enhanced. Largest TPACS of a single nanorod (12271 GM) was substantially larger than a single Rhodamine 6G particle (25 GM) at 760 nm excitation. Characteristics of nanorod TPL emission spectrum can be explained by plasmon-enhanced interband transition of gold. Comparison results of TPL brightness, TPACS and emission spectrum of nanorods can guide selection of optimal contrast agent for selected imaging applications.
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Affiliation(s)
- Tianyi Wang
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - David Halaney
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA
- South Texas Veterans Health Care System, San Antonio, Texas 78229, USA
| | - Derek Ho
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
| | - Marc D. Feldman
- Division of Cardiology, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229, USA
- South Texas Veterans Health Care System, San Antonio, Texas 78229, USA
| | - Thomas E. Milner
- Department of Biomedical Engineering, University of Texas at Austin, 1 University Station C0800, Austin, Texas 78712, USA
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13
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Current world literature. Curr Opin Cardiol 2012; 27:682-95. [PMID: 23075824 DOI: 10.1097/hco.0b013e32835a0ad8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Stacy MR, Maxfield MW, Sinusas AJ. Targeted molecular imaging of angiogenesis in PET and SPECT: a review. THE YALE JOURNAL OF BIOLOGY AND MEDICINE 2012; 85:75-86. [PMID: 22461745 PMCID: PMC3313541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Over the past few decades, there have been significant advancements in the imaging techniques of positron emission tomography (PET) and single photon emission tomography (SPECT). These changes have allowed for the targeted imaging of cellular processes and the development of hybrid imaging systems (e.g., SPECT/CT and PET/CT), which provide both functional and structural images of biological systems. One area that has garnered particular attention is angiogenesis as it relates to ischemic heart disease and limb ischemia. Though the aforementioned techniques have benefits and consequences, they enable scientists and clinicians to identify regions that are vulnerable to or have been exposed to ischemic injury via non-invasive means. This literature review highlights the advancements in molecular imaging techniques and specific probes as they pertain to the process of angiogenesis in cardiovascular disease.
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Affiliation(s)
- Mitchel R. Stacy
- Section of Cardiovascular Medicine, Department of
Internal Medicine, Yale School of Medicine, New Haven, Connecticut,To whom all correspondence should be
addressed: Mitchel R. Stacy, Nuclear Cardiology, 3 FMP, PO Box 208017, New
Haven, CT 06520-8017, Tel: 203-737-5917; Fax: 203-737-1030;
| | - Mark W. Maxfield
- Department of Surgery, Yale School of Medicine, New
Haven, Connecticut
| | - Albert J. Sinusas
- Section of Cardiovascular Medicine, Department of
Internal Medicine, Yale School of Medicine, New Haven, Connecticut,Department of Diagnostic Radiology, Yale School of
Medicine, New Haven, Connecticut
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