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Sever RE, Rosenblum LT, Stanley KC, Cortez AG, Menendez DM, Chagantipati B, Nedrow JR, Edwards WB, Malek MM, Kohanbash G. Detection properties of indium-111 and IRDye800CW for intraoperative molecular imaging use across tissue phantom models. JOURNAL OF BIOMEDICAL OPTICS 2025; 30:S13705. [PMID: 39310036 PMCID: PMC11413652 DOI: 10.1117/1.jbo.30.s1.s13705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 08/12/2024] [Accepted: 08/26/2024] [Indexed: 09/25/2024]
Abstract
Significance Intraoperative molecular imaging (IMI) enables the detection and visualization of cancer tissue using targeted radioactive or fluorescent tracers. While IMI research has rapidly expanded, including the recent Food and Drug Administration approval of a targeted fluorophore, the limits of detection have not been well-defined. Aim The ability of widely available handheld intraoperative tools (Neoprobe and SPY-PHI) to measure gamma decay and fluorescence intensity from IMI tracers was assessed while varying characteristics of both the signal source and the intervening tissue or gelatin phantoms. Approach Gamma decay signal and fluorescence from tracer-bearing tumors (TBTs) and modifiable tumor-like inclusions (TLIs) were measured through increasing thicknesses of porcine tissue and gelatin in custom 3D-printed molds. TBTs buried beneath porcine tissue were used to simulate IMI-guided tumor resection. Results Gamma decay from TBTs and TLIs was detected through significantly thicker tissue and gelatin than fluorescence, with at least 5% of the maximum signal observed through up to 5 and 0.5 cm, respectively, depending on the overlying tissue type or gelatin. Conclusions We developed novel systems that can be fine-tuned to simulate variable tumor characteristics and tissue environments. These were used to evaluate the detection of fluorescent and gamma signals from IMI tracers and simulate IMI surgery.
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Affiliation(s)
- ReidAnn E. Sever
- University of Pittsburgh, Department of Neurological Surgery, Pittsburgh, Pennsylvania, United States
| | - Lauren T. Rosenblum
- University of Pittsburgh, Department of Surgery, Pittsburgh, Pennsylvania, United States
| | - Kayla C. Stanley
- University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
| | - Angel G. Cortez
- University of Pittsburgh Medical Center, In Vivo Imaging Facility Core, Hillman Cancer Center, Pittsburgh, Pennsylvania, United States
| | - Dominic M. Menendez
- University of Missouri, Department of Biochemistry, Columbia, Missouri, United States
| | - Bhuvitha Chagantipati
- University of Pittsburgh, Department of Neurological Surgery, Pittsburgh, Pennsylvania, United States
| | - Jessie R. Nedrow
- University of Pittsburgh Medical Center, In Vivo Imaging Facility Core, Hillman Cancer Center, Pittsburgh, Pennsylvania, United States
| | - W. Barry Edwards
- University of Missouri, Department of Biochemistry, Columbia, Missouri, United States
| | - Marcus M. Malek
- University of Pittsburgh, Department of Surgery, Pittsburgh, Pennsylvania, United States
- University of Pittsburgh School of Medicine, Division of Pediatric General and Thoracic Surgery, Department of Surgery, Pittsburgh, Pennsylvania, United States
| | - Gary Kohanbash
- University of Pittsburgh, Department of Neurological Surgery, Pittsburgh, Pennsylvania, United States
- University of Pittsburgh, Department of Immunology, Pittsburgh, Pennsylvania, United States
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Kantaros A. 3D Printing in Regenerative Medicine: Technologies and Resources Utilized. Int J Mol Sci 2022; 23:ijms232314621. [PMID: 36498949 PMCID: PMC9738732 DOI: 10.3390/ijms232314621] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 11/24/2022] Open
Abstract
Over the past ten years, the use of additive manufacturing techniques, also known as "3D printing", has steadily increased in a variety of scientific fields. There are a number of inherent advantages to these fabrication methods over conventional manufacturing due to the way that they work, which is based on the layer-by-layer material-deposition principle. These benefits include the accurate attribution of complex, pre-designed shapes, as well as the use of a variety of innovative raw materials. Its main advantage is the ability to fabricate custom shapes with an interior lattice network connecting them and a porous surface that traditional manufacturing techniques cannot adequately attribute. Such structures are being used for direct implantation into the human body in the biomedical field in areas such as bio-printing, where this potential is being heavily utilized. The fabricated items must be made of biomaterials with the proper mechanical properties, as well as biomaterials that exhibit characteristics such as biocompatibility, bioresorbability, and biodegradability, in order to meet the strict requirements that such procedures impose. The most significant biomaterials used in these techniques are listed in this work, but their advantages and disadvantages are also discussed in relation to the aforementioned properties that are crucial to their use.
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Affiliation(s)
- Antreas Kantaros
- Department of Industrial Design and Production Engineering, University of West Attica, 12244 Athens, Greece
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Alfonso-Garcia A, Shklover J, Sherlock BE, Panitch A, Griffiths LG, Marcu L. Fiber-based fluorescence lifetime imaging of recellularization processes on vascular tissue constructs. JOURNAL OF BIOPHOTONICS 2018; 11:e201700391. [PMID: 29781171 PMCID: PMC7700018 DOI: 10.1002/jbio.201700391] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 05/16/2018] [Indexed: 05/22/2023]
Abstract
New techniques able to monitor the maturation of tissue engineered constructs over time are needed for a more efficient control of developmental parameters. Here, a label-free fluorescence lifetime imaging (FLIm) approach implemented through a single fiber-optic interface is reported for nondestructive in situ assessment of vascular biomaterials. Recellularization processes of antigen removed bovine pericardium scaffolds with endothelial cells and mesenchymal stem cells were evaluated on the serous and the fibrous sides of the scaffolds, 2 distinct extracellular matrix niches, over the course of a 7 day culture period. Results indicated that fluorescence lifetime successfully report cell presence resolved from extracellular matrix fluorescence. The recellularization process was more rapid on the serous side than on the fibrous side for both cell types, and endothelial cells expanded faster than mesenchymal stem cells on antigen-removed bovine pericardium. Fiber-based FLIm has the potential to become a nondestructive tool for the assessment of tissue maturation by allowing in situ imaging of intraluminal vascular biomaterials.
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Affiliation(s)
- Alba Alfonso-Garcia
- Department of Biomedical Engineering, University of California Davis, Davis, California
| | - Jeny Shklover
- Department of Biomedical Engineering, University of California Davis, Davis, California
| | - Benjamin E. Sherlock
- Department of Biomedical Engineering, University of California Davis, Davis, California
| | - Alyssa Panitch
- Department of Biomedical Engineering, University of California Davis, Davis, California
| | - Leigh G. Griffiths
- Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota
| | - Laura Marcu
- Department of Biomedical Engineering, University of California Davis, Davis, California
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Bui L, Aleid A, Alassaf A, Wilson OC, Raub CB, Frenkel V. Development of a custom biological scaffold for investigating ultrasound-mediated intracellular delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 70:461-470. [DOI: 10.1016/j.msec.2016.09.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 08/08/2016] [Accepted: 09/12/2016] [Indexed: 01/15/2023]
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5
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Appel AA, Larson JC, Garson AB, Guan H, Zhong Z, Nguyen BNB, Fisher JP, Anastasio MA, Brey EM. X-ray phase contrast imaging of calcified tissue and biomaterial structure in bioreactor engineered tissues. Biotechnol Bioeng 2014; 112:612-20. [DOI: 10.1002/bit.25467] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 09/10/2014] [Accepted: 09/18/2014] [Indexed: 11/12/2022]
Affiliation(s)
- Alyssa A. Appel
- Department of Biomedical Engineering; Illinois Institute of Technology; 3255 South Dearborn St Chicago Illinois 60616
- Research Services; Edward Hines Jr. VA Hospital; 5000 S. 5th Avenue Hines Illinois 60141
| | - Jeffery C. Larson
- Department of Biomedical Engineering; Illinois Institute of Technology; 3255 South Dearborn St Chicago Illinois 60616
- Research Services; Edward Hines Jr. VA Hospital; 5000 S. 5th Avenue Hines Illinois 60141
| | - Alfred B. Garson
- Department of Biomedical Engineering; Washington University in St. Louis; St. Louis Missouri
| | - Huifeng Guan
- Department of Biomedical Engineering; Washington University in St. Louis; St. Louis Missouri
| | - Zhong Zhong
- National Synchrotron Light Source; Brookhaven National Laboratory; Upton New York
| | - Bao-Ngoc B. Nguyen
- Fischell Department of Bioengineering; University of Maryland; College Park Maryland
| | - John P. Fisher
- Fischell Department of Bioengineering; University of Maryland; College Park Maryland
| | - Mark A. Anastasio
- Department of Biomedical Engineering; Washington University in St. Louis; St. Louis Missouri
| | - Eric M. Brey
- Department of Biomedical Engineering; Illinois Institute of Technology; 3255 South Dearborn St Chicago Illinois 60616
- Research Services; Edward Hines Jr. VA Hospital; 5000 S. 5th Avenue Hines Illinois 60141
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Niu G, Sapoznik E, Lu P, Criswell T, Mohs AM, Wang G, Lee SJ, Xu Y, Soker S. Fluorescent imaging of endothelial cells in bioengineered blood vessels: the impact of crosslinking of the scaffold. J Tissue Eng Regen Med 2014; 10:955-966. [PMID: 24616385 DOI: 10.1002/term.1876] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 11/01/2013] [Accepted: 01/13/2014] [Indexed: 01/07/2023]
Abstract
Fluorescent imaging is a useful tool to monitor and evaluate bioengineered tissues and organs. However, autofluorescence emitted from the scaffold can be comparable or even overwhelm signals generated by fluorescently labelled cells and biomarkers. Using standard fluorescent microscopy techniques, a simple and easy-to-measure signal to noise ratio metric was developed, which can facilitate the selection of fluorescent biomarkers and the respective biomaterials for tissue engineering studies. Endothelial cells (MS1) expressing green-fluorescent protein and red fluorescent protein (mKate) were seeded on poly(epsilon-caprolactone)-collagen hybrid scaffolds that were prepared by crosslinking with glutaraldehyde, genipin and ethyl(dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide. All scaffolds had comparable mechanical properties, which could meet the requirements for vascular graft applications. ethyl(dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide crosslinked scaffolds had a high signal to noise ratio value because of its low autofluorescence in green and red channels. Genipin crosslinked scaffolds had a high signal to noise ratio only in the green channel, while glutaraldehyde crosslinked scaffolds had a low signal to noise ratio in both green and red channels. The signal to noise ratio was independent of the exposure time. The data show that although similar in their mechanical properties and ability to support cell growth, scaffolds crosslinked with different agents have significant differences in causing autofluorescence of the scaffolds. This result indicates that scaffold's preparation method may have a significant impact on direct imaging of fluorescently labelled cells on scaffolds used for tissue engineering. Copyright © 2014 John Wiley & Sons, Ltd.
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Affiliation(s)
- Guoguang Niu
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC
| | - Etai Sapoznik
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC.,Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Peng Lu
- Bradley Department of Electrical and Computer Engineering, Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Tracy Criswell
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC
| | - Aaron M Mohs
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC.,Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Ge Wang
- Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Sang-Jin Lee
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC
| | - Yong Xu
- Bradley Department of Electrical and Computer Engineering, Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Wake Forest Baptist Medical Center, Medical Center Boulevard, Winston-Salem, NC.,Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
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Appel AA, Anastasio MA, Larson JC, Brey EM. Imaging challenges in biomaterials and tissue engineering. Biomaterials 2013; 34:6615-30. [PMID: 23768903 PMCID: PMC3799904 DOI: 10.1016/j.biomaterials.2013.05.033] [Citation(s) in RCA: 171] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 05/18/2013] [Indexed: 12/11/2022]
Abstract
Biomaterials are employed in the fields of tissue engineering and regenerative medicine (TERM) in order to enhance the regeneration or replacement of tissue function and/or structure. The unique environments resulting from the presence of biomaterials, cells, and tissues result in distinct challenges in regards to monitoring and assessing the results of these interventions. Imaging technologies for three-dimensional (3D) analysis have been identified as a strategic priority in TERM research. Traditionally, histological and immunohistochemical techniques have been used to evaluate engineered tissues. However, these methods do not allow for an accurate volume assessment, are invasive, and do not provide information on functional status. Imaging techniques are needed that enable non-destructive, longitudinal, quantitative, and three-dimensional analysis of TERM strategies. This review focuses on evaluating the application of available imaging modalities for assessment of biomaterials and tissue in TERM applications. Included is a discussion of limitations of these techniques and identification of areas for further development.
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Affiliation(s)
- Alyssa A. Appel
- Department of Biomedical Engineering, Illinois Institute of Technology, 3255 South Dearborn St, Chicago, IL 60616, USA
- Research Service, Hines Veterans Administration Hospital, Hines, IL, USA
| | - Mark A. Anastasio
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, USA
| | - Jeffery C. Larson
- Department of Biomedical Engineering, Illinois Institute of Technology, 3255 South Dearborn St, Chicago, IL 60616, USA
- Research Service, Hines Veterans Administration Hospital, Hines, IL, USA
| | - Eric M. Brey
- Department of Biomedical Engineering, Illinois Institute of Technology, 3255 South Dearborn St, Chicago, IL 60616, USA
- Research Service, Hines Veterans Administration Hospital, Hines, IL, USA
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8
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Whited BM, Hofmann MC, Lu P, Xu Y, Rylander CG, Wang G, Sapoznik E, Criswell T, Lee SJ, Soker S, Rylander MN. Dynamic, nondestructive imaging of a bioengineered vascular graft endothelium. PLoS One 2013; 8:e61275. [PMID: 23585885 PMCID: PMC3621659 DOI: 10.1371/journal.pone.0061275] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Accepted: 03/10/2013] [Indexed: 02/07/2023] Open
Abstract
Bioengineering of vascular grafts holds great potential to address the shortcomings associated with autologous and conventional synthetic vascular grafts used for small diameter grafting procedures. Lumen endothelialization of bioengineered vascular grafts is essential to provide an antithrombogenic graft surface to ensure long-term patency after implantation. Conventional methods used to assess endothelialization in vitro typically involve periodic harvesting of the graft for histological sectioning and staining of the lumen. Endpoint testing methods such as these are effective but do not provide real-time information of endothelial cells in their intact microenvironment, rather only a single time point measurement of endothelium development. Therefore, nondestructive methods are needed to provide dynamic information of graft endothelialization and endothelium maturation in vitro. To address this need, we have developed a nondestructive fiber optic based (FOB) imaging method that is capable of dynamic assessment of graft endothelialization without disturbing the graft housed in a bioreactor. In this study we demonstrate the capability of the FOB imaging method to quantify electrospun vascular graft endothelialization, EC detachment, and apoptosis in a nondestructive manner. The electrospun scaffold fiber diameter of the graft lumen was systematically varied and the FOB imaging system was used to noninvasively quantify the affect of topography on graft endothelialization over a 7-day period. Additionally, results demonstrated that the FOB imaging method had a greater imaging penetration depth than that of two-photon microscopy. This imaging method is a powerful tool to optimize vascular grafts and bioreactor conditions in vitro, and can be further adapted to monitor endothelium maturation and response to fluid flow bioreactor preconditioning.
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Affiliation(s)
- Bryce M Whited
- School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, Virginia, United States of America
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Criswell TL, Corona BT, Wang Z, Zhou Y, Niu G, Xu Y, Christ GJ, Soker S. The role of endothelial cells in myofiber differentiation and the vascularization and innervation of bioengineered muscle tissue in vivo. Biomaterials 2012; 34:140-9. [PMID: 23059002 DOI: 10.1016/j.biomaterials.2012.09.045] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Accepted: 09/20/2012] [Indexed: 12/25/2022]
Abstract
Musculoskeletal disorders are a major cause of disability and effective treatments are currently lacking. Tissue engineering affords the possibility of new therapies utilizing cells and biomaterials for the recovery of muscle volume and function. A major consideration in skeletal muscle engineering is the integration of a functional vasculature within the regenerating tissue. In this study we employed fluorescent cell labels to track the location and differentiation of co-cultured cells in vivo and in vitro. We first utilized a co-culture of fluorescently labeled endothelial cells (ECs) and muscle progenitor cells (MPCs) to investigate the ability of ECs to enhance muscle tissue formation and vascularization in an in vivo model of bioengineered muscle. Scaffolds that had been seeded with both MPCs and ECs showed significantly greater vascularization, tissue formation and enhanced innervation as compared to scaffolds seeded with MPCs alone. Subsequently, we performed in vitro experiments using a 3-cell type system (ECs, MPCs, and pericytes (PCs)) to demonstrate the utility of fluorescent cell labeling for monitoring cell growth and differentiation. The growth and differentiation of individual cell types was determined using live cell fluorescent microscopy demonstrating the utility of fluorescent labels to monitor tissue organization in real time.
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Affiliation(s)
- Tracy L Criswell
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA
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