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Hu Z, Mao L, Liu X, Xing X, Zhang L, Zhou Q, Song C. A novel discrete linkage-type electrode for radiofrequency-induced intestinal anastomosis. MINIM INVASIV THER 2024; 33:71-79. [PMID: 38219217 DOI: 10.1080/13645706.2023.2291439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 11/15/2023] [Indexed: 01/16/2024]
Abstract
INTRODUCTION For decades, radiofrequency (RF)-induced tissue fusion has garnered great attention due to its potential to replace sutures and staples for anastomosis of tissue reconstruction. However, the complexities of achieving high bonding strength and reducing excessive thermal damage present substantial limitations of existing fusion devices. MATERIALS AND METHODS This study proposed a discrete linkage-type electrode to carry out ex vivo RF-induced intestinal anastomosis experiments. The anastomotic strength was examined by burst pressure and shear strength test. The degree of thermal damage was monitored through an infrared thermal imager. And the anastomotic stoma fused by the electrode was further investigated through histopathological and ultrastructural observation. RESULTS The burst pressure and shear strength of anastomotic tissue can reach 62.2 ± 3.08 mmHg and 8.73 ± 1.11N, respectively, when the pressure, power and duration are 995 kPa, 160 W and 13 s, and the thermal damage can be controlled within limits. Histopathological and ultrastructural observation indicate that an intact and fully fused stomas with collagenic crosslink can be formed. CONCLUSION The discrete linkage-type electrode presents favorable efficiency and security in RF-induced tissue fusion, and these results are informative to the design of electrosurgical medical devices with controllable pressure and energy delivery.
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Affiliation(s)
- Zhongxin Hu
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Lin Mao
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Xuyan Liu
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Xupo Xing
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Linying Zhang
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Quan Zhou
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Chengli Song
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
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Xing X, Song C. A novel electrode for reducing tissue thermal damage in radiofrequency-induced intestinal anastomosis. MINIM INVASIV THER 2024; 33:80-89. [PMID: 38147884 DOI: 10.1080/13645706.2023.2297774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 11/28/2023] [Indexed: 12/28/2023]
Abstract
PURPOSE This study aimed to design a novel electrode for reducing tissue thermal damage in radiofrequency-induced intestinal anastomosis. MATERIAL AND METHODS We developed and compared two electrodes (Ring electrode, and Plum electrode with reduced section of the middle fusion area by nearly 80% arising from novel structural design) by performing ex-vivo experiments and finite element analysis. RESULTS In contrast to the Ring electrode group, slightly higher mean strength is acquired with the tensile force and burst pressure results increasing from 9.7 ± 1.47 N, 84.0 ± 5.99 mmHg to 11.1 ± 1.71 N, 89.4 ± 6.60 mmHg, respectively, as well as a significant reduction in tissue thermal damage for the Plum electrode group, with compression pressure of 20 kPa, RF energy of 120 W and welding duration of 8 s applied to the target regions to achieve anastomosis. Besides, the novel structural design of the Plum electrode can counteract the tension generated by intestinal peristalsis and enhance the biomechanical strength of the anastomotic area. The histological observation showed that the fusion area of the two-layer intestinal tissue is tightly connected with decreased thickness. CONCLUSION The novel electrode (Plum electrode) could reduce tissue thermal damage in radiofrequency-induced intestinal anastomosis.
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Affiliation(s)
- Xupo Xing
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Chengli Song
- Shanghai Institute for Minimally Invasive Therapy, School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
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Zhu C, Yin L, Xu J, Liu H, Xiang X, Zhao H, Qiu J, Liu K. An ex vivo preliminary investigation into the impact of parameters on tissue welding strength in small intestine mucosa-mucosa end-to-end anastomosis. Front Bioeng Biotechnol 2023; 11:1200239. [PMID: 37342503 PMCID: PMC10277648 DOI: 10.3389/fbioe.2023.1200239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 05/24/2023] [Indexed: 06/23/2023] Open
Abstract
Background: Tissue welding is an electrosurgical technique that can fuse tissue for small intestine anastomosis. However, limited knowledge exists on its application in mucosa-mucosa end-to-end anastomosis. This study investigates the effects of initial compression pressure, out-put power, and duration time on anastomosis strength ex vivo in mucosa-mucosa end-to-end anastomosis. Methods: Ex vivo porcine bowel segments were used to create 140 mucosa-mucosa end-to-end fusions. Different experimental parameters were employed for fusion, including initial com-pression pressure (50kPa-400 kPa), output power (90W, 110W, and 140W), and fusion time (5, 10, 15, 20 s). The fusion quality was measured by burst pressure and optical microscopes. Results: The best fusion quality was achieved with an initial compressive pressure between 200 and 250 kPa, an output power of 140W, and a fusion time of 15 s. However, an increase in output power and duration time resulted in a wider range of thermal damage. There was no significant difference between the burst pressure at 15 and 20 s (p > 0.05). However, a substantial increase in thermal damage was observed with longer fusion times of 15 and 20 s (p < 0.05). Conclusion: The best fusion quality for mucosa-mucosa end-to-end anastomosis ex vivo is achieved when the initial compressive pressure is between 200 and 250 kPa, the output power is approximately 140W, and the fusion time is approximately 15 s. These findings can serve as a valuable theoretical foundation and technical guidance for conducting animal experiments in vivo and subsequent tissue regeneration.
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Affiliation(s)
- Caihui Zhu
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
| | - Li Yin
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
| | - Jianzhi Xu
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
| | - Haotian Liu
- Academy for Engineering and Technology, Fudan University, Shanghai, China
| | - Xiaowei Xiang
- Academy for Engineering and Technology, Fudan University, Shanghai, China
| | - Hui Zhao
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
| | - Jian Qiu
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
| | - Kefu Liu
- Department of Light Sources and Illuminating Engineering, School of Information Science and Technology, Fudan University, Shanghai, China
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Tu L, Zhou YU, Wang P, Wang H, Mao LIN, Hou J, Liu Z, Song C. Minimizing thermal damage using self-cooling jaws for radiofrequency intestinal tissue fusion. MINIM INVASIV THER 2023; 32:33-41. [PMID: 36519801 DOI: 10.1080/13645706.2022.2155064] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION Radiofrequency (RF)-induced tissue fusion shows great potential in sealing intestinal tissue without foreign materials. To improve the performance of RF-induced tissue fusion, a novel self-cooling jaw has been designed to minimize thermal damage during the fusion. MATERIAL AND METHODS The prototype of self-cooling jaws was developed and manufactured. A total number of 60 mucosa-to-mucosa fusions were conducted using ex-vivo porcine intestinal segments with the proposed design and conventional bipolar jaws. The effects of intestinal fusion were evaluated based on temperature curves, burst pressure, thermal damage, and histological appearances. RESULTS The self-cooling jaws showed significant decrease in temperature during the fusion process. An optimal burst pressure (5.7 ± 0.5 kPa) and thermal damage range (0.9 ± 0.1 mm) were observed when the applied RF power was 100 W. The thermal damage range of the prototype has almost decreased 36% in comparison with the conventional bipolar jaws (1.4 ± 0.1 mm). The histological observation revealed that a decrease of thermal damage was achieved through the application of self-cooling jaws. CONCLUSIONS The self-cooling jaws were proved to be effective for reducing the thermal damage during RF-induced tissue fusion, which could potentially promote the clinical application of tissue fusion techniques in the future.
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Affiliation(s)
- Liangyong Tu
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Y U Zhou
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Peiyao Wang
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Haochen Wang
- School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, China
| | - L I N Mao
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Jian Hou
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Ziyue Liu
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Chengli Song
- School of Health Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China
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Lindberg GCJ, Cui X, Durham M, Veenendaal L, Schon BS, Hooper GJ, Lim KS, Woodfield TBF. Probing Multicellular Tissue Fusion of Cocultured Spheroids-A 3D-Bioassembly Model. Adv Sci (Weinh) 2021; 8:e2103320. [PMID: 34632729 PMCID: PMC8596109 DOI: 10.1002/advs.202103320] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Indexed: 05/02/2023]
Abstract
While decades of research have enriched the knowledge of how to grow cells into mature tissues, little is yet known about the next phase: fusing of these engineered tissues into larger functional structures. The specific effect of multicellular interfaces on tissue fusion remains largely unexplored. Here, a facile 3D-bioassembly platform is introduced to primarily study fusion of cartilage-cartilage interfaces using spheroids formed from human mesenchymal stromal cells (hMSCs) and articular chondrocytes (hACs). 3D-bioassembly of two adjacent hMSCs spheroids displays coordinated migration and noteworthy matrix deposition while the interface between two hAC tissues lacks both cells and type-II collagen. Cocultures contribute to increased phenotypic stability in the fusion region while close initial contact between hMSCs and hACs (mixed) yields superior hyaline differentiation over more distant, indirect cocultures. This reduced ability of potent hMSCs to fuse with mature hAC tissue further underlines the major clinical challenge that is integration. Together, this data offer the first proof of an in vitro 3D-model to reliably study lateral fusion mechanisms between multicellular spheroids and mature cartilage tissues. Ultimately, this high-throughput 3D-bioassembly model provides a bridge between understanding cellular differentiation and tissue fusion and offers the potential to probe fundamental biological mechanisms that underpin organogenesis.
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Affiliation(s)
- Gabriella C. J. Lindberg
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Xiaolin Cui
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Mitchell Durham
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Laura Veenendaal
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Benjamin S. Schon
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Gary J. Hooper
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Khoon S. Lim
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
| | - Tim B. F. Woodfield
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) GroupDepartment of Orthopaedic SurgeryUniversity of Otago Christchurch2 Riccarton AvenueChristchurch8011New Zealand
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Rainger J, Williamson KA, Soares DC, Truch J, Kurian D, Gillessen‐Kaesbach G, Seawright A, Prendergast J, Halachev M, Wheeler A, McTeir L, Gill AC, van Heyningen V, Davey MG, FitzPatrick DR. A recurrent de novo mutation in ACTG1 causes isolated ocular coloboma. Hum Mutat 2017; 38:942-946. [PMID: 28493397 PMCID: PMC5518294 DOI: 10.1002/humu.23246] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/26/2017] [Accepted: 05/03/2017] [Indexed: 11/17/2022]
Abstract
Ocular coloboma (OC) is a defect in optic fissure closure and is a common cause of severe congenital visual impairment. Bilateral OC is primarily genetically determined and shows marked locus heterogeneity. Whole-exome sequencing (WES) was used to analyze 12 trios (child affected with OC and both unaffected parents). This identified de novo mutations in 10 different genes in eight probands. Three of these genes encoded proteins associated with actin cytoskeleton dynamics: ACTG1, TWF1, and LCP1. Proband-only WES identified a second unrelated individual with isolated OC carrying the same ACTG1 allele, encoding p.(Pro70Leu). Both individuals have normal neurodevelopment with no extra-ocular signs of Baraitser-Winter syndrome. We found this mutant protein to be incapable of incorporation into F-actin. The LCP1 and TWF1 variants each resulted in only minor disturbance of actin interactions, and no further plausibly causative variants were identified in these genes on resequencing 380 unrelated individuals with OC.
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Affiliation(s)
- Joe Rainger
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | - Kathleen A Williamson
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - Dinesh C Soares
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - Julia Truch
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - Dominic Kurian
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | | | - Anne Seawright
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - James Prendergast
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | - Mihail Halachev
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - Ann Wheeler
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
| | - Lynn McTeir
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | - Andrew C Gill
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | | | - Megan G Davey
- The Roslin Institute and R(D)SVSUniversity of EdinburghEaster Bush CampusMidlothianUK
| | - UK10K
- Wellcome Trust Sanger InstituteGenome CampusHinxtonCambridgeshireUK
| | - David R FitzPatrick
- MRC Human Genetics Unit, IGMMUniversity of EdinburghWestern General HospitalEdinburghUK
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Olsen TR, Casco M, Herbst A, Evans G, Rothermel T, Pruett L, Reid J, Barry K, Jaeggli MP, Simionescu DT, Visconti RP, Alexis F. Longitudinal Stretching for Maturation of Vascular Tissues Using Magnetic Forces. Bioengineering (Basel) 2016; 3:E29. [PMID: 28952591 DOI: 10.3390/bioengineering3040029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 09/26/2016] [Accepted: 10/31/2016] [Indexed: 12/03/2022] Open
Abstract
Cellular spheroids were studied to determine their use as “bioinks” in the biofabrication of tissue engineered constructs. Specifically, magnetic forces were used to mediate the cyclic longitudinal stretching of tissues composed of Janus magnetic cellular spheroids (JMCSs), as part of a post-processing method for enhancing the deposition and mechanical properties of an extracellular matrix (ECM). The purpose was to accelerate the conventional tissue maturation process via novel post-processing techniques that accelerate the functional, structural, and mechanical mimicking of native tissues. The results of a forty-day study of JMCSs indicated an expression of collagen I, collagen IV, elastin, and fibronectin, which are important vascular ECM proteins. Most notably, the subsequent exposure of fused tissue sheets composed of JMCSs to magnetic forces did not hinder the production of these key proteins. Quantitative results demonstrate that cyclic longitudinal stretching of the tissue sheets mediated by these magnetic forces increased the Young’s modulus and induced collagen fiber alignment over a seven day period, when compared to statically conditioned controls. Specifically, the elastin and collagen content of these dynamically-conditioned sheets were 35- and three-fold greater, respectively, at seven days compared to the statically-conditioned controls at three days. These findings indicate the potential of using magnetic forces in tissue maturation, specifically through the cyclic longitudinal stretching of tissues.
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Nier V, Deforet M, Duclos G, Yevick HG, Cochet-Escartin O, Marcq P, Silberzan P. Tissue fusion over nonadhering surfaces. Proc Natl Acad Sci U S A 2015; 112:9546-51. [PMID: 26199417 DOI: 10.1073/pnas.1501278112] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Tissue fusion eliminates physical voids in a tissue to form a continuous structure and is central to many processes in development and repair. Fusion events in vivo, particularly in embryonic development, often involve the purse-string contraction of a pluricellular actomyosin cable at the free edge. However, in vitro, adhesion of the cells to their substrate favors a closure mechanism mediated by lamellipodial protrusions, which has prevented a systematic study of the purse-string mechanism. Here, we show that monolayers can cover well-controlled mesoscopic nonadherent areas much larger than a cell size by purse-string closure and that active epithelial fluctuations are required for this process. We have formulated a simple stochastic model that includes purse-string contractility, tissue fluctuations, and effective friction to qualitatively and quantitatively account for the dynamics of closure. Our data suggest that, in vivo, tissue fusion adapts to the local environment by coordinating lamellipodial protrusions and purse-string contractions.
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Beachley V, Kasyanov V, Nagy-Mehesz A, Norris R, Ozolanta I, Kalejs M, Stradins P, Baptista L, da Silva K, Grainjero J, Wen X, Mironov V. The fusion of tissue spheroids attached to pre-stretched electrospun polyurethane scaffolds. J Tissue Eng 2014; 5:2041731414556561. [PMID: 25396042 PMCID: PMC4229054 DOI: 10.1177/2041731414556561] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 09/26/2014] [Indexed: 11/17/2022] Open
Abstract
Effective cell invasion into thick electrospun biomimetic scaffolds is an unsolved problem. One possible strategy to biofabricate tissue constructs of desirable thickness and material properties without the need for cell invasion is to use thin (<2 µm) porous electrospun meshes and self-assembling (capable of tissue fusion) tissue spheroids as building blocks. Pre-stretched electrospun meshes remained taut in cell culture and were able to support tissue spheroids with minimal deformation. We hypothesize that elastic electrospun scaffolds could be used as temporal support templates for rapid self-assembly of cell spheroids into higher order tissue structures, such as engineered vascular tissue. The aim of this study was to investigate how the attachment of tissue spheroids to pre-stretched polyurethane scaffolds may interfere with the tissue fusion process. Tissue spheroids attached, spread, and fused after being placed on pre-stretched polyurethane electrospun matrices and formed tissue constructs. Efforts to eliminate hole defects with fibrogenic tissue growth factor-β resulted in the increased synthesis of collagen and periostin and a dramatic reduction in hole size and number. In control experiments, tissue spheroids fuse on a non-adhesive hydrogel and form continuous tissue constructs without holes. Our data demonstrate that tissue spheroids attached to thin stretched elastic electrospun scaffolds have an interrupted tissue fusion process. The resulting tissue-engineered construct phenotype is a direct outcome of the delicate balance of the competing physical forces operating during the tissue fusion process at the interface of the pre-stretched elastic scaffold and the attached tissue spheroids. We have shown that with appropriate treatments, this process can be modulated, and thus, a thin pre-stretched elastic polyurethane electrospun scaffold could serve as a supporting template for rapid biofabrication of thick tissue-engineered constructs without the need for cell invasion.
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Affiliation(s)
- Vince Beachley
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ, USA
| | | | - Agnes Nagy-Mehesz
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Russell Norris
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Iveta Ozolanta
- Laboratory of Biomechanics, Riga Stradins University, Riga, Latvia
| | - Martins Kalejs
- Laboratory of Biomechanics, Riga Stradins University, Riga, Latvia ; Department of Cardiac Surgery, Pauls Stradins Clinical University Hospital, Riga, Latvia
| | - Peteris Stradins
- Laboratory of Biomechanics, Riga Stradins University, Riga, Latvia ; Department of Cardiac Surgery, Pauls Stradins Clinical University Hospital, Riga, Latvia
| | - Leandra Baptista
- Laboratory of Tissue Engineering, Inmetro, Xerém, Rio de Janeiro, Brazil
| | - Karina da Silva
- Laboratory of Tissue Engineering, Inmetro, Xerém, Rio de Janeiro, Brazil
| | - Jose Grainjero
- Laboratory of Tissue Engineering, Inmetro, Xerém, Rio de Janeiro, Brazil
| | - Xuejun Wen
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Vladimir Mironov
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA ; Division of 3D Technologies, Renato Archer Center for Information Technology, Campinas, São Paulo, Brazil
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Su L, Cloyd KL, Arya S, Hedegaard MAB, Steele JAM, Elson DS, Stevens MM, Hanna GB. Raman spectroscopic evidence of tissue restructuring in heat-induced tissue fusion. J Biophotonics 2014; 7:713-723. [PMID: 24243853 DOI: 10.1002/jbio.201300099] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 07/29/2013] [Accepted: 10/29/2013] [Indexed: 06/02/2023]
Abstract
Heat-induced tissue fusion via radio-frequency (RF) energy has gained wide acceptance clinically and here we present the first optical-Raman-spectroscopy study on tissue fusion samples in vitro. This study provides direct insights into tissue constituent and structural changes on the molecular level, exposing spectroscopic evidence for the loss of distinct collagen fibre rich tissue layers as well as the denaturing and restructuring of collagen crosslinks post RF fusion. These findings open the door for more advanced optical feedback-control methods and characterization during heat-induced tissue fusion, which will lead to new clinical applications of this promising technology.
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Affiliation(s)
- Lei Su
- Department of Surgery and Cancer, Imperial College London, St. Mary's Hospital, London W2 1NY, UK; Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool L69 3GJ, UK
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11
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Abstract
Biofabrication of living structures with desired topology and functionality requires the interdisciplinary effort of practitioners of the physical, life and engineering sciences. Such efforts are being undertaken in many laboratories around the world. Numerous approaches are pursued, such as those based on the use of natural or artificial scaffolds, decellularized cadaveric extracellular matrices and, most lately, bioprinting. To be successful in this endeavor, it is crucial to provide in vitro micro-environmental clues for the cells resembling those in the organism. Therefore, scaffolds, populated with differentiated cells or stem cells, of increasing complexity and sophistication are being fabricated. However, no matter how sophisticated scaffolds are, they can cause problems stemming from their degradation, eliciting immunogenic reactions and other a priori unforeseen complications. It is also being realized that ultimately the best approach might be to rely on the self-assembly and self-organizing properties of cells and tissues and the innate regenerative capability of the organism itself, not just simply prepare tissue and organ structures in vitro followed by their implantation. Here we briefly review the different strategies for the fabrication of three-dimensional biological structures, in particular bioprinting. We detail a fully biological, scaffoldless, print-based engineering approach that uses self-assembling multicellular units as bio-ink particles and employs early developmental morphogenetic principles, such as cell sorting and tissue fusion.
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Affiliation(s)
- Karoly Jakab
- Department of Physics & Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - Francoise Marga
- Department of Physics & Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - Cyrille Norotte
- Department of Biology, University of Missouri, Columbia, MO 65211, USA
| | - Keith Murphy
- Organovo, Inc., 5871 Oberlin Drive, San Diego, CA 92121, USA
| | | | - Gabor Forgacs
- Department of Physics & Astronomy, University of Missouri, Columbia, MO 65211, USA
- Department of Biology, University of Missouri, Columbia, MO 65211, USA
- Department of Biomedical Engineering, University of Missouri, Columbia, MO 65211, USA
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