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Nandakumar N, Iyyer S, Mohan T, Nair SV, Sathy BN. Smart Design for Hybrid Bioprinting of Scalable and Viable Tissue Constructs. Tissue Eng Part A 2023. [PMID: 37930736 DOI: 10.1089/ten.tea.2023.0188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023] Open
Abstract
Hybrid bioprinting uses sequential printing of melt-extruded biodegradable thermoplastic polymer and cell-encapsulated bioink in a predesigned manner using high- and low-temperature print heads for the fabrication of robust three-dimensional (3D) biological constructs. However, the high-temperature print head and melt-extruded polymer cause irreversible thermal damage to the bioprinted cells, and it affects viability and functionality of 3D bioprinted biological constructs. Thus, there is an urgent need to develop innovative approaches to protect the bioprinted cells, coming into contact or at close proximities to the melt-extruded thermoplastic polymer and the high-temperature print head during hybrid bioprinting. Therefore, this study investigated the potential of iterating the structural architecture pattern (SAP) of melt-printed thermoplastic layers and the cell printing pattern (CPP) to protect the cells from temperature-associated damage during hybrid bioprinting. A novel SAP for printing the thermoplastic polymer and an associated CPP for minimizing thermal damage to the 3D bioprinted construct have been developed. The newly developed SAP- and CPP-based hybrid bioprinted biological constructs showed significantly low thermal damage compared to conventionally hybrid bioprinted biological constructs. The results from this study suggest that the newly developed SAP and CPP can be an improved hybrid bioprinting strategy for developing living constructs at the human scale.
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Affiliation(s)
- Niji Nandakumar
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, India
| | - Subramania Iyyer
- Department of Head and Neck Surgery and Oncology and Amrita Institute of Medical Sciences and Research Centre, Amrita Vishwa Vidyapeetham, Kochi, India
| | - Thadi Mohan
- Department of Orthopaedics, Amrita Institute of Medical Sciences and Research Centre, Amrita Vishwa Vidyapeetham, Kochi, India
| | - Shantikumar V Nair
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, India
| | - Binulal N Sathy
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, India
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2
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Canales DA, Piñones N, Saavedra M, Loyo C, Palza H, Peponi L, Leonés A, Baier RV, Boccaccini AR, Grünelwald A, Zapata PA. Fabrication and assessment of bifunctional electrospun poly(l-lactic acid) scaffolds with bioglass and zinc oxide nanoparticles for bone tissue engineering. Int J Biol Macromol 2023; 228:78-88. [PMID: 36565827 DOI: 10.1016/j.ijbiomac.2022.12.195] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 12/11/2022] [Accepted: 12/17/2022] [Indexed: 12/24/2022]
Abstract
Electrospun scaffolds based on poly(l-lactic acid) (PLLA) with bioglass (n-BG) and zinc oxide (n-ZnO), and mixture of both, were developed to design bifunctional biomaterials with enhanced bioactive and biocidal properties. The presence of n-BG increased the fiber diameter of the pure PLA from 1.5 ± 0.3 μm to 3.0 ± 0.8 μm for 20 wt%. ZnO and the mixed nanoparticles did not significantly affect the morphology. The mechanical properties decreased with the presence of nanoparticles. Scaffolds based on PLA/n-BG promoted hydroxyapatite (HA) formation in simulated body fluid (SBF) that was inhibited with the presence of ZnO. Notably, mixed particles produced bioactivity although at longer times. The incorporation of n-ZnO produced a biocidal capacity against S. aureus in the polymeric scaffold, reaching a viability reduction of 60 % after 6 h of exposure. When both types of nanoparticles were combined, the bacterial viability reduction was 30 %. Pure PLA scaffolds and the composites with n-BG showed good ST-2 bone marrow-derived cell line viability, scaffolds with n-BG (pure or mixture) presented lower viability. Results validated the use of both n-BG and n-ZnO fillers for the development of novel bifunctional PLA-based scaffolds with both bioactive and biocidal properties for bone tissue engineering applications.
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Affiliation(s)
- Daniel A Canales
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile.
| | - Natalia Piñones
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile
| | - Marcela Saavedra
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile
| | - Carlos Loyo
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile
| | - Humberto Palza
- Departamento de Ingeniería Química y Biotecnología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Chile
| | - Laura Peponi
- Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), Madrid, Spain
| | - Adrián Leonés
- Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), Madrid, Spain
| | - Raúl Vallejos Baier
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile
| | - Aldo R Boccaccini
- Department of Materials Science and Engineering, Institute of Biomaterials, Friedrich Alexander-University Erlangen-Nuremberg, Erlangen, Germany; Bavarian Polymer Institute, 91058 Erlangen, Germany
| | - Alina Grünelwald
- Department of Materials Science and Engineering, Institute of Biomaterials, Friedrich Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Paula A Zapata
- Grupo Polímeros, Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, USACH, Casilla 40, Correo 33, Santiago, Chile.
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3
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Chailakhyan RK, Grosheva AG, Vorob'eva NN, Sviridov AP, Yusupov VI. Laser Thermo-Photobiomodulation of Bone Marrow Mesenchymal Stem Cells. Bull Exp Biol Med 2023; 174:523-526. [PMID: 36899204 DOI: 10.1007/s10517-023-05741-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Indexed: 03/12/2023]
Abstract
We studied the effect of laser radiation of moderate intensity with a wavelength of 970 nm on the efficiency of colony formation of rat bone marrow mesenchymal stem cells (MSC) in vitro. In this case, photobimodulation and thermal heating of MSC occur simultaneously. This combined laser treatment allows increasing the number of colonies by 6 times in comparison with the control and by more than 3 times in comparison with thermal heating alone. The mechanism of such an increase is associated with combined thermal and light effects of laser radiation of moderate intensity, which stimulates cell proliferation. This phenomenon can be used as the basis for solving the most important task of cell transplantation, associated with the expansion of autologous stem cells and activation of their proliferative potential.
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Affiliation(s)
- R K Chailakhyan
- N. F. Gamaleya National Research Center of Epidemiology and Microbiology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A G Grosheva
- N. F. Gamaleya National Research Center of Epidemiology and Microbiology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - N N Vorob'eva
- Federal Research Center of Crystallography and Photonics, Russian Academy of Sciences, Institute of Photonic Technologies, Russian Academy of Sciences, Moscow, Russia
| | - A P Sviridov
- Federal Research Center of Crystallography and Photonics, Russian Academy of Sciences, Institute of Photonic Technologies, Russian Academy of Sciences, Moscow, Russia.
| | - V I Yusupov
- Federal Research Center of Crystallography and Photonics, Russian Academy of Sciences, Institute of Photonic Technologies, Russian Academy of Sciences, Moscow, Russia
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4
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A novel feature for monitoring the enzymatic harvesting process of adherent cell cultures based on lens-free imaging. Sci Rep 2022; 12:22202. [PMID: 36564377 PMCID: PMC9789138 DOI: 10.1038/s41598-022-22561-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 10/17/2022] [Indexed: 12/24/2022] Open
Abstract
Adherent cell cultures are often dissociated from their culture vessel (and each other) through enzymatic harvesting, where the detachment response is monitored by an operator. However, this approach is lacking standardisation and reproducibility, and prolonged exposure or too high concentrations can affect the cell's viability and differentiation potential. Quantitative monitoring systems are required to characterise the cell detachment response and objectively determine the optimal time-point to inhibit the enzymatic reaction. State-of-the-art methodologies rely on bulky imaging systems and/or features (e.g. circularity) that lack robustness. In this study, lens-free imaging (LFI) technology was used to develop a novel cell detachment feature. Seven different donors were cultured and subsequently harvested with a (diluted) enzymatic harvesting solution after 3, 5 and 7 days of culture. Cell detachment was captured with the LFI set-up over a period of 20 min (every 20 s) and by optimising the reconstruction of the LFI intensity images, a new feature could be identified. Bright regions in the intensity image were identified as detaching cells and using image analysis, a method was developed to automatically extract this feature, defined as the percentage of detached cell regions. Next, the method was quantitatively and qualitatively validated on a diverse set of images. Average absolute error values of 1.49%, 1.34% and 1.97% were obtained for medium to high density and overconfluent cultures, respectively. The detachment response was quantified for all conditions and the optimal time for enzyme inhibition was reached when approximately 92.5% of the cells were detached. On average, inhibition times of 9.6-11.1 and 16.2-17.2 min were obtained for medium to high density and overconfluent cultures, respectively. In general, overconfluent cultures detached much slower, while their detachment rate was also decreased by the diluted harvesting solution. Moreover, several donors exhibited similar trends in cell detachment behaviour, with two clear outliers. Using the novel feature, measurements can be performed with an increased robustness, while the compact LFI design could pave the way for in situ monitoring in a variety of culture vessels, including bioreactors.
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Pulsed Electrical Stimulation Affects Osteoblast Adhesion and Calcium Ion Signaling. Cells 2022; 11:cells11172650. [PMID: 36078058 PMCID: PMC9454840 DOI: 10.3390/cells11172650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/18/2022] [Accepted: 08/23/2022] [Indexed: 11/17/2022] Open
Abstract
An extensive research field in regenerative medicine is electrical stimulation (ES) and its impact on tissue and cells. The mechanism of action of ES, particularly the role of electrical parameters like intensity, frequency, and duration of the electric field, is not yet fully understood. Human MG-63 osteoblasts were electrically stimulated for 10 min with a commercially available multi-channel system (IonOptix). We generated alternating current (AC) electrical fields with a voltage of 1 or 5 V and frequencies of 7.9 or 20 Hz, respectively. To exclude liquid-mediated effects, we characterized the AC-stimulated culture medium. AC stimulation did not change the medium’s pH, temperature, and oxygen content. The H2O2 level was comparable with the unstimulated samples except at 5 V_7.9 Hz, where a significant increase in H2O2 was found within the first 30 min. Pulsed electrical stimulation was beneficial for the process of attachment and initial adhesion of suspended osteoblasts. At the same time, the intracellular Ca2+ level was enhanced and highest for 20 Hz stimulated cells with 1 and 5 V, respectively. In addition, increased Ca2+ mobilization after an additional trigger (ATP) was detected at these parameters. New knowledge was provided on why electrical stimulation contributes to cell activation in bone tissue regeneration.
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Analysis of Temperature Field in the Dielectrophoresis-Based Microfluidic Cell Separation Device. FLUIDS 2022. [DOI: 10.3390/fluids7080263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cell separation techniques based on dielectrophoresis are of high interest as an effective method of performing cell separation non-invasively on cells. However, dielectrophoresis devices have the problem that cells in the device are exposed to a high-temperature environment due to the generation of Joule heat caused by high-voltage application and dielectric-loss heat when the applied voltage is AC voltage. There is concern that the heat generated in the device may affect cell viability, cell cycle and apoptosis induction. In this study, the temperature field inside the dielectrophoretic cell separation device was experimentally and numerically investigated. The temperature rise at the bottom of the flow channel in the device was measured using the LIF method, and the thermofluidal behavior of the device was numerically simulated by adopting a heat generation model that takes the Joule and dielectric-loss heating into account in the energy equation. The temperature rise in the device was evaluated and the effect of the heat generation on cells in the device is discussed.
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7
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Sun C, Dong Y, Wei J, Cai M, Liang D, Fu Y, Zhou Y, Sui Y, Wu F, Mikhaylov R, Wang H, Fan F, Xie Z, Stringer M, Yang Z, Wu Z, Tian L, Yang X. Acoustically Accelerated Neural Differentiation of Human Embryonic Stem Cells. Acta Biomater 2022; 151:333-345. [DOI: 10.1016/j.actbio.2022.07.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 06/14/2022] [Accepted: 07/25/2022] [Indexed: 11/17/2022]
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Zeng Z, Xie Y, Li L, Wang H, Tan J, Li X, Bian Q, Zhang Y, Liu T, Weng Y, Chen J. Reducing Endogenous Labile Zn May Help to Reduce Smooth Muscle Cell Injury around Vascular Stents. Int J Mol Sci 2022; 23:5139. [PMID: 35563532 PMCID: PMC9101291 DOI: 10.3390/ijms23095139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/01/2022] [Accepted: 05/02/2022] [Indexed: 02/05/2023] Open
Abstract
Vascular stent service involves complex service environments and performance requirements, among which the histocompatibility of the stent could seriously affect the therapeutic effect. In the pathology of vascular disease, the thin fiber cap is easily ruptured, exposing the necrotic core below, and triggering a series of dangerous biochemical reactions. In contrast, the thin neointima, considered an essential structure growing on the stent, may evolve into vulnerable plaque structures due to lesions induced by the stent. Therefore, the reduction of necrosis around the stent below the thin neointima is indispensable. In this work, different cell model experiments suggested that the content of endogenous labile Zn positively correlated with cell injury. Zinquin-Zn fluorescence experiments and zinc ion channels research suggested that the change in the content of endogenous labile Zn in smooth muscle cells is affected by different stent coatings. The content of endogenous labile Zn in cells negatively correlated with cell viability. Animal experiments indirectly verified the increase in endogenous labile Zn by detecting the expression of Zn regulatory protein (metallothionein) in the necrotic tissues. Reducing the content of endogenous labile Zn may favor a reduction in smooth muscle cell injury and necrosis. This biochemical mechanism is effective in improving the therapeutic effect of vascular stents.
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Affiliation(s)
- Zheng Zeng
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Yinhong Xie
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Li Li
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Huanran Wang
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Jianying Tan
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Xia Li
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Qihao Bian
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Yu Zhang
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Tao Liu
- Medical College of Acu-Moxi and Rehabilitation, Guanzhou University of Chinese Medicine, Guangzhou 510006, China;
| | - Yajun Weng
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
| | - Junying Chen
- Key Laboratory of Advanced Technology of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (Z.Z.); (Y.X.); (L.L.); (H.W.); (J.T.); (X.L.); (Q.B.); (Y.Z.)
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Ahmadi F, Dalirsani Z, Tayarani-Najaran Z, Ebrahimzadeh-Bideskan A, Shafieian R. A Comparative Analysis of Photobiomodulation-Mediated Biological Effects of Single Versus Double Irradiation on Dental Pulp Stem Cells: An In Vitro Study. Photobiomodul Photomed Laser Surg 2022; 40:334-342. [PMID: 35559714 DOI: 10.1089/photob.2021.0134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Objective: In recent years, fractionated irradiation protocols, rather than a simple plan of exposure, have been proposed as a more effective method in the field of tissue regeneration. Thus, this study aimed at a comparative analysis of single versus double irradiation of an 808-nm diode laser, in terms of dental pulp stem cells' (DPSCs) viability and proliferation in vitro. Methods: Subcultured DPSCs were either irradiated, or not (control group), with energy densities of 3, 7, and 12 J·cm-2 in a single- or double-session manner (24 h apart). On 0, 12, 24, 48, and 72 h postirradiation, cell viability and proliferation were evaluated through Trypan Blue and alamarBlue assays, respectively. Results: During the first 48 h postirradiation, the highest rates of DPSC proliferation were assigned to double irradiation at 3 or single exposure to 7 J⋅cm-2, with no cytotoxic effects on cell viability. Inversely, single irradiation at 12, or a double session of exposure to 7 or 12 J⋅cm-2, led to a significant descent in the rates of proliferation and cell viability. Conclusions: Within the limitations of this study, evidence suggests a positive impact on the biological responses of DPSCs following double session of exposure to lower energy densities as well as a single irradiation at a higher energy dosage.
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Affiliation(s)
- Farahnaz Ahmadi
- Pharmaceutical Sciences Research Center, School of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Zohreh Dalirsani
- Oral and Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Zahra Tayarani-Najaran
- Medical Toxicology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.,Targeted Drug Delivery Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Reyhaneh Shafieian
- Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Stem Cells and Regenerative Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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Jiang Z, Lin FY, Jiang K, Nguyen H, Chang CY, Lin CC. Dissolvable microgel-templated macroporous hydrogels for controlled cell assembly. BIOMATERIALS ADVANCES 2022; 134:112712. [PMID: 35581097 PMCID: PMC9358784 DOI: 10.1016/j.msec.2022.112712] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 12/05/2021] [Accepted: 02/08/2022] [Indexed: 12/22/2022]
Abstract
Mesenchymal stem cells (MSCs)-based therapies have been widely used to promote tissue regeneration and to modulate immune/inflammatory response. The therapeutic potential of MSCs can be further improved by forming multi-cellular spheroids. Meanwhile, hydrogels with macroporous structures are advantageous for improving mass transport properties for the cell-laden matrices. Herein, we report the fabrication of MSC-laden macroporous hydrogel scaffolds through incorporating rapidly dissolvable spherical cell-laden microgels. Dissolvable microgels were fabricated by tandem droplet-microfluidics and thiol-norbornene photopolymerization using a novel fast-degrading macromer poly(ethylene glycol)-norbornene-dopamine (PEGNB-Dopa). The cell-laden PEGNB-Dopa microgels were subsequently encapsulated within another bulk hydrogel matrix, whose porous structure was generated efficiently by the rapid degradation of the PEGNB-Dopa microgels. The cytocompatibility of this in situ pore-forming approach was demonstrated with multiple cell types. Furthermore, adjusting the stiffness and cell adhesiveness of the bulk hydrogels afforded the formation of solid cell spheroids or hollow spheres. The assembly of solid or hollow MSC spheroids led to differential activation of AKT pathway. Finally, MSCs solid spheroids formed in situ within the macroporous hydrogels exhibited robust secretion of HGF, VEGF-A, IL-6, IL-8, and TIMP-2. In summary, this platform provides an innovative method for forming cell-laden macroporous hydrogels for a variety of future biomedical applications.
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Affiliation(s)
- Zhongliang Jiang
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202 USA
| | - Fang-Yi Lin
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202 USA
| | - Kun Jiang
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202 USA
| | - Han Nguyen
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 USA
| | - Chun-Yi Chang
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 USA
| | - Chien-Chi Lin
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA; Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA; Indiana University Simon Comprehensive Cancer Center, Indianapolis, IN 46202, USA.
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11
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Longoni A, Utomo L, Robinson A, Levato R, Rosenberg AJWP, Gawlitta D. Acceleration of Bone Regeneration Induced by a Soft-Callus Mimetic Material. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103284. [PMID: 34962103 PMCID: PMC8867155 DOI: 10.1002/advs.202103284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 11/12/2021] [Indexed: 06/14/2023]
Abstract
Clinical implementation of endochondral bone regeneration (EBR) would benefit from the engineering of devitalized cartilaginous constructs of allogeneic origins. Nevertheless, development of effective devitalization strategies that preserves extracellular matrix (ECM) is still challenging. The aim of this study is to investigate EBR induced by devitalized, soft callus-mimetic spheroids. To challenge the translatability of this approach, the constructs are generated using an allogeneic cell source. Neo-bone formation is evaluated in an immunocompetent rat model, subcutaneously and in a critical size femur defect. Living spheroids are used as controls. Also, the effect of spheroid maturation towards hypertrophy is evaluated. The devitalization procedure successfully induces cell death without affecting ECM composition or bioactivity. In vivo, a larger amount of neo-bone formation is observed for the devitalized chondrogenic group both ectopically and orthotopically. In the femur defect, accelerated bone regeneration is observed in the devitalized chondrogenic group, where defect bridging is observed 4 weeks post-implantation. The authors' results show, for the first time, a dramatic increase in the rate of bone formation induced by devitalized soft callus-mimetics. These findings pave the way for the development of a new generation of allogeneic, "off-the-shelf" products for EBR, which are suitable for the treatment of every patient.
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Affiliation(s)
- Alessia Longoni
- Department of Oral and Maxillofacial Surgery & Special Dental CareUniversity Medical Center UtrechtUtrecht UniversityG05.222, PO Box 85500Utrecht3508 GAThe Netherlands
- Regenerative Medicine Center UtrechtUtrecht3584 CTThe Netherlands
| | - Lizette Utomo
- Department of Oral and Maxillofacial Surgery & Special Dental CareUniversity Medical Center UtrechtUtrecht UniversityG05.222, PO Box 85500Utrecht3508 GAThe Netherlands
- Regenerative Medicine Center UtrechtUtrecht3584 CTThe Netherlands
- Department of Clinical SciencesFaculty of Veterinary MedicineUtrecht UniversityYalelaan 108Utrecht3584CMThe Netherlands
| | - Abbie Robinson
- Department of Oral and Maxillofacial Surgery & Special Dental CareUniversity Medical Center UtrechtUtrecht UniversityG05.222, PO Box 85500Utrecht3508 GAThe Netherlands
- Regenerative Medicine Center UtrechtUtrecht3584 CTThe Netherlands
| | - Riccardo Levato
- Regenerative Medicine Center UtrechtUtrecht3584 CTThe Netherlands
- Department of Clinical SciencesFaculty of Veterinary MedicineUtrecht UniversityYalelaan 108Utrecht3584CMThe Netherlands
- Department of OrthopaedicsUniversity Medical Center UtrechtUtrecht UniversityUtrecht3508 GAThe Netherlands
| | - Antoine J. W. P. Rosenberg
- Department of Oral and Maxillofacial Surgery & Special Dental CareUniversity Medical Center UtrechtUtrecht UniversityG05.222, PO Box 85500Utrecht3508 GAThe Netherlands
| | - Debby Gawlitta
- Department of Oral and Maxillofacial Surgery & Special Dental CareUniversity Medical Center UtrechtUtrecht UniversityG05.222, PO Box 85500Utrecht3508 GAThe Netherlands
- Regenerative Medicine Center UtrechtUtrecht3584 CTThe Netherlands
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12
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Dubay R, Urban JN, Darling EM. Single-Cell Microgels for Diagnostics and Therapeutics. ADVANCED FUNCTIONAL MATERIALS 2021; 31:2009946. [PMID: 36329867 PMCID: PMC9629779 DOI: 10.1002/adfm.202009946] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Indexed: 05/14/2023]
Abstract
Cell encapsulation within hydrogel droplets is transforming what is feasible in multiple fields of biomedical science such as tissue engineering and regenerative medicine, in vitro modeling, and cell-based therapies. Recent advances have allowed researchers to miniaturize material encapsulation complexes down to single-cell scales, where each complex, termed a single-cell microgel, contains only one cell surrounded by a hydrogel matrix while remaining <100 μm in size. With this achievement, studies requiring single-cell resolution are now possible, similar to those done using liquid droplet encapsulation. Of particular note, applications involving long-term in vitro cultures, modular bioinks, high-throughput screenings, and formation of 3D cellular microenvironments can be tuned independently to suit the needs of individual cells and experimental goals. In this progress report, an overview of established materials and techniques used to fabricate single-cell microgels, as well as insight into potential alternatives is provided. This focused review is concluded by discussing applications that have already benefited from single-cell microgel technologies, as well as prospective applications on the cusp of achieving important new capabilities.
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Affiliation(s)
- Ryan Dubay
- Center for Biomedical Engineering, Brown University, 175 Meeting St., Providence, RI 02912, USA
- Draper, 555 Technology Sq., Cambridge, MA 02139, USA
| | - Joseph N Urban
- Center for Biomedical Engineering, Brown University, 175 Meeting St., Providence, RI 02912, USA
| | - Eric M Darling
- Department of Molecular Pharmacology, Physiology, and Biotechnology, Center for Biomedical Engineering, School of Engineering, Department of Orthopaedics, Brown University, 175 Meeting St., Providence, RI 02912, USA
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Optical and thermal fields induced in the bone marrow by external laser irradiation. Lasers Med Sci 2021; 37:1245-1253. [PMID: 34347196 DOI: 10.1007/s10103-021-03380-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 07/16/2021] [Indexed: 10/20/2022]
Abstract
In regenerative medicine, the problem of growing mesenchymal stem cells from the bone marrow often arises. In such cases is important that the number of initial cells was large enough and their proliferative activity was high. We believe that this problem can be solved by short-term heating of local areas of the bone marrow in vivo with laser radiation. In this regard, it is of interest to study the optical and temperature fields induced inside the tubular bone under external laser irradiation. In this work, we obtained experimental data on the spatial distribution of temperature in the bone marrow of the rat femur in vitro under external exposure to laser radiation with wavelengths of 970 and 1940 nm. Radiation delivery was carried out using an optical fiber which tip contacted the surface of the femur bone. A thin thermocouple was used to measure the temperature in a local area of the bone marrow. By moving the optical fiber tip discretely along the longitudinal axis of the bone, and the thermocouple in the perpendicular direction, the spatial temperature distributions in dynamics were measured. Similarly, the spatial distributions of the laser radiation intensity were measured by replacing thermocouple with optical fiber probe. A thermal camera was used to control the temperature of the bone surface near the tip of the fiber. It was shown that the marrow could be heated from the outside by about 5-10 °C during 10 s without significant overheating of the bone tissue. The data obtained make it possible to estimate the volume of the bone marrow heated by the laser to a predetermined temperature and to make a reasonable choice of laser exposure modes to stimulate the proliferative activity of bone marrow mesenchymal stem cells in vivo.
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Sayin E, Baran ET, Elsheikh A, Mudera V, Cheema U, Hasirci V. Evaluating Oxygen Tensions Related to Bone Marrow and Matrix for MSC Differentiation in 2D and 3D Biomimetic Lamellar Scaffolds. Int J Mol Sci 2021; 22:4010. [PMID: 33924614 PMCID: PMC8068918 DOI: 10.3390/ijms22084010] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/02/2021] [Accepted: 04/06/2021] [Indexed: 02/06/2023] Open
Abstract
The physiological O2 microenvironment of mesenchymal stem cells (MSCs) and osteoblasts and the dimensionality of a substrate are known to be important in regulating cell phenotype and function. By providing the physiologically normoxic environments of bone marrow (5%) and matrix (12%), we assessed their potential to maintain stemness, induce osteogenic differentiation, and enhance the material properties in the micropatterned collagen/silk fibroin scaffolds that were produced in 2D or 3D. Expression of osterix (OSX) and vascular endothelial growth factor A (VEGFA) was significantly enhanced in the 3D scaffold in all oxygen environments. At 21% O2, OSX and VEGFA expressions in the 3D scaffold were respectively 13,200 and 270 times higher than those of the 2D scaffold. Markers for assessing stemness were significantly more pronounced on tissue culture polystyrene and 2D scaffold incubated at 5% O2. At 21% O2, we measured significant increases in ultimate tensile strength (p < 0.0001) and Young's modulus (p = 0.003) of the 3D scaffold compared to the 2D scaffold, whilst 5% O2 hindered the positive effect of cell seeding on tensile strength. In conclusion, we demonstrated that the 3D culture of MSCs in collagen/silk fibroin scaffolds provided biomimetic cues for bone progenitor cells toward differentiation and enhanced the tensile mechanical properties.
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Affiliation(s)
- Esen Sayin
- Department of Biotechnology, Middle East Technical University, 06800 Ankara, Turkey;
| | - Erkan Türker Baran
- Department of Tissue Engineering, University of Health Sciences, 34668 Istanbul, Turkey;
| | - Ahmed Elsheikh
- School of Engineering, The University of Liverpool, Liverpool L69 3GH, UK;
| | - Vivek Mudera
- UCL Centre for 3D Models of Health and Disease, Division of Surgery and Interventional Science, University College London, 43-45 Foley Street, Fitzrovia, London W1W 7TY, UK; (V.M.); (U.C.)
| | - Umber Cheema
- UCL Centre for 3D Models of Health and Disease, Division of Surgery and Interventional Science, University College London, 43-45 Foley Street, Fitzrovia, London W1W 7TY, UK; (V.M.); (U.C.)
| | - Vasif Hasirci
- Department of Biotechnology, Middle East Technical University, 06800 Ankara, Turkey;
- Department of Medical Engineering, Acibadem Mehmet Ali Aydinlar University, 34752 Istanbul, Turkey
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Dolp R, Eylert G, Auger C, Aijaz A, Chen YA, Amini-Nik S, Parousis A, Datu AK, Jeschke MG. Biological characteristics of stem cells derived from burned skin-a comparative study with umbilical cord stem cells. Stem Cell Res Ther 2021; 12:137. [PMID: 33597003 PMCID: PMC7888080 DOI: 10.1186/s13287-021-02140-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 01/05/2021] [Indexed: 12/31/2022] Open
Abstract
INTRODUCTION Burned human skin, which is routinely excised and discarded, contains viable mesenchymal stromal/stem cells (burn-derived mesenchymal stromal/stem cells; BD-MSCs). These cells show promising potential to enable and aid wound regeneration. However, little is known about their cell characteristics and biological function. OBJECTIVES This study had two aims: first, to assess critical and cellular characteristics of BD-MSCs and, second, to compare those results with multipotent well-characterized MSCs from Wharton's jelly of human umbilical cords (umbilical cord mesenchymal stromal/stem cells, UC-MSCs). METHODS BD- and UC-MSCs were compared using immunophenotyping, multi-lineage differentiation, seahorse analysis for glycolytic and mitochondrial function, immune surface markers, and cell secretion profile assays. RESULTS When compared to UC-MSCs, BD-MSCs demonstrated a lower mesenchymal differentiation capacity and altered inflammatory cytokine secretomes at baseline and after stimulation with lipopolysaccharides. No significant differences were found in population doubling time, colony formation, cell proliferation cell cycle, production of reactive oxygen species, glycolytic and mitochondrial function, and in the expression of major histocompatibility complex I and II and toll-like receptor (TLR). IMPORTANCE, TRANSLATION This study reveals valuable insights about MSCs obtained from burned skin and show comparable cellular characteristics with UC-MSCs, highlighting their potentials in cell therapy and skin regeneration.
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Affiliation(s)
- Reinhard Dolp
- Sunnybrook Research Institute, Toronto, Canada
- Department of Psychiatry, Queen's University, Kingston, Canada
- Institute of Medical Science, University of Toronto, Ontario, Canada
| | - Gertraud Eylert
- Sunnybrook Research Institute, Toronto, Canada
- Institute of Medical Science, University of Toronto, Ontario, Canada
- Division of Plastic, Aesthetic and Reconstructive Surgery, Medical University of Graz, Graz, Austria
| | | | | | | | - Saeid Amini-Nik
- Sunnybrook Research Institute, Toronto, Canada
- Department of Laboratory Medicine and Pathobiology (LMP), University of Toronto, Toronto, Canada
- SGS Harrison Research Laboratories, SGS North America, New York Metropolitan Area, Union, NJ, USA
| | | | | | - Marc G Jeschke
- Sunnybrook Research Institute, Toronto, Canada.
- Department of Immunology, Ross Tilley Burn Centre, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Toronto, ON, M4N 3M5, Canada.
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, Canada.
- Ross Tilley Burn Centre, Sunnybrook Health Science Centre, Toronto, Canada.
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Siddiqui SH, Subramaniyan SA, Kang D, Park J, Khan M, Choi HW, Shim K. Direct exposure to mild heat stress stimulates cell viability and heat shock protein expression in primary cultured broiler fibroblasts. Cell Stress Chaperones 2020; 25:1033-1043. [PMID: 32696180 PMCID: PMC7591668 DOI: 10.1007/s12192-020-01140-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 07/13/2020] [Accepted: 07/15/2020] [Indexed: 12/30/2022] Open
Abstract
Fibroblasts produce collagen which is mainly essential for repairing tissue damage and maintaining the structural integrity of tissues. However, studies have given scientific evidence about harmful effect of thermal manipulation in fibroblast. Therefore, the aim of this study was to determine the mild heat stress temperature which increased broiler fibroblast viability. The experiment was divided into two groups (37 °C and 41 °C), and each group was divided into five subgroups based on different incubation times (6 h, 12 h, 24 h, 48 h, and 72 h) with three replications. In experimental group (41 °C), fibroblast viability increased significantly in 12 h but decreased in 72 h compared with control (37 °C). At 41 °C, live cell increased significantly in 24 h and then declined in 48 h as well as 72 h than control. Moreover, the S phase lengthened in shorter incubation time of experimental group compared with control. Protein and mRNA (HSP70, HSP60, and HSP47) expressions were significantly higher at 41 °C compared with 37 °C, but at the end of the experiment, HSP expression level was higher in both groups. Finally, this study recommended 41 °C as a mild heat stress temperature for increasing broiler fibroblast viability.
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Affiliation(s)
- Sharif Hasan Siddiqui
- Department of Animal Biotechnology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Sivakumar Allur Subramaniyan
- Department of Animal Biotechnology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Darae Kang
- Department of Animal Biotechnology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Jinryong Park
- Department of Animal Biotechnology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea
| | - Mousumee Khan
- Department of Biomedical Sciences and Institute for Medical Science, Jeonbuk National University, Jeonju, 54907, Republic of Korea
| | - Hyun Woo Choi
- Department of Animal Science, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
| | - Kwanseob Shim
- Department of Animal Biotechnology, College of Agriculture and Life Sciences, Jeonbuk National University, Jeonju, 54896, Republic of Korea.
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Wikiel KJ, Overbey DM, Carmichael H, Chapman BC, Moore JT, Barnett CC, Jones TS, Robinson TN, Jones EL. Stray energy transfer in single-incision robotic surgery. Surg Endosc 2020; 35:2981-2985. [PMID: 32591940 DOI: 10.1007/s00464-020-07742-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/12/2020] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Stray energy transfer from surgical monopolar radiofrequency energy instruments can cause unintended thermal injuries during laparoscopic surgery. Single-incision laparoscopic surgery transfers more stray energy than traditional laparoscopic surgery. There is paucity of published data concerning stray energy during single-incision robotic surgery. The purpose of this study was to quantify stray energy transfer during traditional, multiport robotic surgery (TRS) compared to single-incision robotic surgery (SIRS). METHODS An in vivo porcine model was used to simulate a multiport or single-incision robotic cholecystectomy (DaVinci Si, Intuitive Surgical, Sunnyvale, CA). A 5 s, open air activation of the monopolar scissors was done on 30 W and 60 W coag mode (ForceTriad, Covidien-Medtronic, Boulder, CO) and Swift Coag effect 3, max power 180 W (VIO 300D, ERBE USA, Marietta, GA). Temperature of the tissue (°C) adjacent to the tip of the assistant grasper or the camera was measured with a thermal camera (E95, FLIR Systems, Wilsonville, OR) to quantify stray energy transfer. RESULTS Stray energy transfer was greater in the SIRS setup compared to TRS setup at the assistant grasper (11.6 ± 3.3 °C vs. 8.4 ± 1.6 °C, p = 0.013). Reducing power from 60 to 30 W significantly reduced stray energy transfer in SIRS (15.3 ± 3.4 °C vs. 11.6 ± 3.3 °C, p = 0.023), but not significantly for TRS (9.4 ± 2.5 °C vs. 8.4 ± 1.6 °C, p = 0.278). The use of a constant voltage regulating generator also minimized stray energy transfer for both SIRS (0.7 ± 0.4 °C, p < 0.001) and TRS (0.7 ± 0.4 °C, p < 0.001). CONCLUSIONS More stray energy transfer occurs during single-incision robotic surgery than multiport robotic surgery. Utilizing a constant voltage regulating generator minimized stray energy transfer for both setups. These data can be used to guide robotic surgeons in their use of safe, surgical energy.
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Affiliation(s)
- Krzysztof J Wikiel
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA.
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA.
| | - Douglas M Overbey
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Department of Surgery, Duke University, Durham, NC, USA
| | - Heather Carmichael
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
| | - Brandon C Chapman
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Department of Surgery, University of Tennessee College of Medicine, Chattanooga, TN, USA
| | - John T Moore
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Carlton C Barnett
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Teresa S Jones
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Thomas N Robinson
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Edward L Jones
- Department of Surgery, the University of Colorado School of Medicine & the Denver Veterans Affairs Medical Center, Aurora, CO, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
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Inoo K, Yamamoto M, Tabata Y. Preparation of cell aggregates incorporating gelatin hydrogel microspheres of sugar-responsive water solubilization. J Tissue Eng Regen Med 2020; 14:1050-1062. [PMID: 32478475 DOI: 10.1002/term.3076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 05/01/2020] [Accepted: 05/11/2020] [Indexed: 12/18/2022]
Abstract
The objective of this study is to design hydrogel microspheres of a cell scaffold, which not only function as a scaffold to form cell aggregates of three-dimensional culture but also can disappear to release growth factors in the well-controlled manner by noncytotoxic stimulation in any timing. The hydrogel microspheres were prepared by a water-in-oil emulsion method from m-aminophenylboronic acid (APBA)-introduced gelatin (APBA-gelatin) with or without poly(vinyl alcohol) (PVA) mixing. Irrespective of the PVA concentration, the microspheres with the same diameter were prepared. The microspheres were water solubilized only by adding sorbitol of a sugar although the solubilization extent depended on the PVA concentration. When cocultured with the microspheres, mesenchymal stem cells formed cell aggregates homogeneously incorporating the microspheres. Upon adding sorbitol in the culture medium, mixed APBA-gelatin-PVA hydrogel microspheres disappeared with time in the cell aggregates. The microspheres containing basic fibroblast growth factor or bone morphogenetic protein-2 released the respective growth factor accompanied with the microspheres disappearance. It is concluded that the present microspheres of sugar-responsive water solubilization are promising scaffold of cell aggregates and have an ability to allow growth factors to be released in the cell aggregates when it is required.
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Affiliation(s)
- Kanako Inoo
- Laboratory of Biomaterials, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Masaya Yamamoto
- Laboratory of Biomaterials, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yasuhiko Tabata
- Laboratory of Biomaterials, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
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Overbey DM, Carmichael H, Wikiel KJ, Hirth DA, Chapman BC, Moore JT, Barnett CC, Jones TS, Robinson TN, Jones EL. Monopolar stray energy in robotic surgery. Surg Endosc 2020; 35:2084-2090. [PMID: 32385708 DOI: 10.1007/s00464-020-07605-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 04/28/2020] [Indexed: 11/26/2022]
Abstract
INTRODUCTION Stray energy transfer from monopolar radiofrequency energy during laparoscopy can be potentially catastrophic. Robotic surgery is increasing in popularity; however, the risk of stray energy transfer during robotic surgery is unknown. The purpose of this study was to (1) quantify stray energy transfer using robotic instrumentation, (2) determine strategies to minimize the transfer of energy, and (3) compare robotic stray energy transfer to laparoscopy. METHODS In a laparoscopic trainer, a monopolar instrument (L-hook) was activated with DaVinci Si (Intuitive, Sunnyvale, CA) robotic instruments. A camera and assistant grasper were inserted to mimic a minimally invasive cholecystectomy. During activation of the L-hook, the non-electric tips of the camera and grasper were placed adjacent to simulated tissue (saline-soaked sponge). The primary outcome was change in temperature from baseline (°C) measured nearest the tip of the non-electric instrument. RESULTS Simulated tissue nearest the robotic grasper increased an average of 18.3 ± 5.8 °C; p < 0.001 from baseline. Tissue nearest the robotic camera tip increased (9.0 ± 2.1 °C; p < 0.001). Decreasing the power from 30 to 15 W (18.3 ± 5.8 vs. 2.6 ± 2.7 °C, p < 0.001) or using low-voltage cut mode (18.3 ± 5.8 vs. 3.1 ± 2.1 °C, p < 0.001) reduced stray energy transfer to the robotic grasper. Desiccating tissue, in contrast to open air activation, also significantly reduced stray energy transfer for the grasper (18.3 ± 5.8 vs. 0.15 ± 0.21 °C, p < 0.001) and camera (9.0 ± 2.1 vs. 0.24 ± 0.34 °C, p < 0.001). CONCLUSIONS Stray energy transfer occurs during robotic surgery. The assistant grasper carries the highest risk for thermal injury. Similar to laparoscopy, stray energy transfer can be reduced by lowering the power setting, utilizing a low-voltage cut mode instead of coagulation mode and avoiding open air activation. These practical findings can aid surgeons performing robotic surgery to reduce injuries from stray energy.
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Affiliation(s)
| | - Heather Carmichael
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Krzysztof J Wikiel
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Douglas A Hirth
- General Surgeons of Western Colorado, Grand Junction, CO, USA
| | - Brandon C Chapman
- General Surgeons of Western Colorado, Grand Junction, CO, USA
- Department of Surgery, University of Tennessee College of Medicine, Chattanooga, TN, USA
| | - John T Moore
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Carlton C Barnett
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Teresa S Jones
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Thomas N Robinson
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA
| | - Edward L Jones
- Department of Surgery, the University of Colorado School of Medicine & the Rocky Mountain Regional Denver Veterans Affairs Medical Center, 1700 North Wheeling St, Mail Stop 112, Aurora, CO, 80045, USA.
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Svoradová A, Makarevich A, Vašíček J, Olexiková L, Dragin S, Chrenek P. Microscopic Assessment of Dead Cell Ratio in Cryopreserved Chicken Primordial Germ Cells. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2019; 25:1257-1262. [PMID: 31530326 DOI: 10.1017/s1431927619014934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This study aimed to compare three methods of cell death assessment [trypan blue exclusion (TBE), propidium iodide viability assay (PIVA), and transmission electron microscopy] to evaluate fresh and frozen-thawed chicken primordial germ cells (PGCs). For this study, chicken PGCs were collected from ROSS 908 and Oravka breed hens, cryopreserved-thawed according to the protocol, and submitted for different cell death assessments. We observed significant differences between TBE and PIVA techniques in the detectable proportion of dead cells in fresh (14.14 ± 1.27 versus 7.16 ± 1.02%, respectively) and frozen-thawed (44.00 ± 2.11 versus 33.33 ± 1.67%, respectively) samples of the Oravka breed. Moreover, significant differences (p < 0.05) between TBE and PIVA techniques in the detectable proportion of dead cells in fresh (9.20 ± 0.60 versus 5.37 ± 0.51%) samples of ROSS 908 breed were recorded. Differences may be due to methodological, sensitivity, and toxicity features of each technique tested, where TB stains cell cytoplasm of dead cells and PI penetrates and intercalates into DNA of dead cells. Therefore, we suggest using a more precise and sensitive PIVA for viability evaluation of PGCs. Further research is needed to apply various fluorochromes for more detailed cell viability evaluation.
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Affiliation(s)
- Andrea Svoradová
- Faculty of Natural Sciences, Constantine the Philosopher University, Trieda A. Hlinku 1, 949 79 Nitra, Slovakia
| | - Alexander Makarevich
- Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Hlohovecká 2, 951 41 Lužianky, Slovakia
| | - Jaromír Vašíček
- Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Hlohovecká 2, 951 41 Lužianky, Slovakia
- Faculty of Biotechnology and Food Science, Slovak University of Agriculture, Trieda A. Hlinku 2, 949 76 Nitra, Slovakia
| | - Lucia Olexiková
- Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Hlohovecká 2, 951 41 Lužianky, Slovakia
| | - Sasa Dragin
- Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovića 8, Novi Sad, Serbia
| | - Peter Chrenek
- Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Hlohovecká 2, 951 41 Lužianky, Slovakia
- Faculty of Biotechnology and Food Science, Slovak University of Agriculture, Trieda A. Hlinku 2, 949 76 Nitra, Slovakia
- Department of Animal Biochemistry and Biotechnology, University of Science and Technology, Al. prof. S. Kaliskiego 7, 85-796 Bydgoszcz, Poland
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Thermal cycling effect on osteogenic differentiation of MC3T3-E1 cells loaded on 3D-porous Biphasic Calcium Phosphate (BCP) scaffolds for early osteogenesis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 105:110027. [PMID: 31546388 DOI: 10.1016/j.msec.2019.110027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/21/2019] [Accepted: 07/26/2019] [Indexed: 12/30/2022]
Abstract
The application of heat stress on a defect site during the healing process is a promising technique for early bone regeneration. The primary goal of this study was to investigate the effect of periodic heat shock on bone formation. MC3T3-E1 cells were seeded onto biphasic calcium phosphate (BCP) scaffolds, followed by periodic heating to evaluate osteogenic differentiation. Heat was applied to cells seeded onto scaffolds at 41 °C for 1 h once, twice, and four times a day for seven days and their viability, morphology, and differentiation were analyzed. BCP scaffolds with interconnected porous structures mimic bone biology for cellular studies. MTT and confocal studies have shown that heat shock significantly increased cell proliferation without any toxic effects. Compared to non-heated samples, heat shock enhanced calcium deposition and mineralization, which could be visualized by SEM observation and Alizarin red S staining. Immunostaining images showed the localization of osteogenic proteins ALP and OPN on heat-shocked cells. qRT-PCR analysis revealed the presence of more osteospecific markers, osteopontin (OPN), osteocalcin, collagen type X, and Runx2, in the heat-shocked samples than in the non-heated sample. Periodic heat shock significantly upregulated both heat shock proteins (HSP70 and HSP27) in differentiated MC3T3-E1 cells. The results of this study demonstrated that periodically heat applied especially two times a day was better approach for osteogenic differentiation. Hence, this work provides a define temperature and time schedule for the development of a clinical heating device in future for early bone regeneration during the postsurgical period.
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Salehi-pourmehr H, Rahbarghazi R, Mahmoudi J, Roshangar L, Chapple CR, Hajebrahimi S, Abolhasanpour N, Azghani MR. Intra-bladder wall transplantation of bone marrow mesenchymal stem cells improved urinary bladder dysfunction following spinal cord injury. Life Sci 2019; 221:20-28. [DOI: 10.1016/j.lfs.2019.02.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 01/25/2019] [Accepted: 02/04/2019] [Indexed: 12/14/2022]
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Aksoy B, Besse N, Boom RJ, Hoogenberg BJ, Blom M, Shea H. Latchable microfluidic valve arrays based on shape memory polymer actuators. LAB ON A CHIP 2019; 19:608-617. [PMID: 30662992 DOI: 10.1039/c8lc01024b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report arrays of latching microfluidic valves based on shape memory polymers (SMPs), and show their applications as reagent mixers and as peristaltic pumps. The valve design takes advantage of the SMP's multiple stable shapes and over a hundred-fold stiffness change with temperature to enable a) permanent zero-power latching in either open or closed positions (>15 h), as well as b) extended cyclic operation (>3000 cycles). The moving element in the valves consists of a tri-layer with a 50 μm thick central SMP layer, 25 μm thick patterned carbon-silicone (CB/PDMS) heaters underneath, and a 38 μm thick styrene ethylene butylene styrene (SEBS) impermeable film on top. Each valve of the array is individually addressable by synchronizing its integrated local Joule heating with a single external pressure supply. This architecture significantly reduces the device footprint and eliminates the need for multiplexing in microfluidic large scale integration (mLSI) systems.
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Affiliation(s)
- Bekir Aksoy
- Soft Transducers Laboratory (LMTS), Ecole Polytechnique Fédérale de Lausanne (EPFL), 2000 Neuchâtel, Switzerland.
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Ibtisham F, Zhao Y, Nawab A, Liguang H, Wu J, Xiao M, Zhao Z, An L. The Effect of High Temperature on Viability, Proliferation, Apoptosis and Anti-oxidant Status of Chicken Embryonic Fibroblast Cells. BRAZILIAN JOURNAL OF POULTRY SCIENCE 2018. [DOI: 10.1590/1806-9061-2017-0685] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Y Zhao
- Guangdong Ocean University, China
| | - A Nawab
- Guangdong Ocean University, China
| | | | - J Wu
- Guangdong Ocean University, China
| | - M Xiao
- Guangdong Ocean University, China
| | - Z Zhao
- Guangdong Ocean University, China
| | - L An
- Guangdong Ocean University, China
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Effect of nanoheat stimulation mediated by magnetic nanocomposite hydrogel on the osteogenic differentiation of mesenchymal stem cells. SCIENCE CHINA-LIFE SCIENCES 2018; 61:448-456. [DOI: 10.1007/s11427-017-9287-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 01/05/2018] [Indexed: 12/20/2022]
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Biomacromolecular-based ionic-covalent hydrogels for cell encapsulation: The atelocollagen − Oxidized polysaccharides couples. Carbohydr Polym 2017; 169:366-375. [DOI: 10.1016/j.carbpol.2017.04.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 03/29/2017] [Accepted: 04/18/2017] [Indexed: 12/19/2022]
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Chabot D, Tremblay T, Paré I, Bazin R, Loubaki L. Transient warming events occurring after freezing impairs umbilical cord-derived mesenchymal stromal cells functionality. Cytotherapy 2017; 19:978-989. [PMID: 28606762 DOI: 10.1016/j.jcyt.2017.04.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 03/28/2017] [Accepted: 04/27/2017] [Indexed: 12/29/2022]
Abstract
BACKGROUND Mesenchymal stromal cells (MSCs) have shown promising results for the treatment of refractory acute graft-versus-host disease. While safety of MSC infusion has been demonstrated, the use of cryopreserved MSCs in clinical trials has raised concerns regarding the retention of their functional activity. This has led to the recommendation by experts in the field to use freshly harvested MSCs, even though this approach is much less practical from a logistic point of view. In the present study, we revisited the impact of cryopreservation on MSC functionality and addressed the possibility that warming events on frozen cells rather than cryopreservation per se could impact MSC functionality. METHODS Following controlled-rate freezing to -130°C, umbilical cord-derived MSCs were left at room temperature (RT) for 2-10 min or on dry ice for 10 min, before being transferred into liquid nitrogen (LqN2). MSCs of each group were subsequently tested (viability, functionality and cellular damage) and compared with their freshly harvested counterparts. RESULTS We demonstrated that freshly harvested MSCs as well as cryopreserved MSCs that were left on dry ice following step-down freezing have comparable viability, functionality and integrity. In contrast, cryopreserved MSCs that were left at RT before being transferred into LqN2 were functionally impaired and showed cellular damage upon thawing even though they exhibited high viability. DISCUSSION Warming events after freezing and not cryopreservation per se significantly impair MSC functionality, indicating that cryopreserved MSCs can be an advantageous alternative to freshly harvested cells for therapeutic purposes.
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Affiliation(s)
- Dominique Chabot
- Department of Research and Development, Héma-Québec, Québec City, QC, Canada; Department of Biochemistry, Microbiology and Bioinformatics, Laval University, Québec City, QC, Canada
| | - Tony Tremblay
- Department of Research and Development, Héma-Québec, Québec City, QC, Canada
| | - Isabelle Paré
- Department of Research and Development, Héma-Québec, Québec City, QC, Canada
| | - Renée Bazin
- Department of Research and Development, Héma-Québec, Québec City, QC, Canada; Department of Biochemistry, Microbiology and Bioinformatics, Laval University, Québec City, QC, Canada
| | - Lionel Loubaki
- Department of Research and Development, Héma-Québec, Québec City, QC, Canada; Department of Biochemistry, Microbiology and Bioinformatics, Laval University, Québec City, QC, Canada.
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Acrylic bone cement and starch: Botanical variety impact on curing parameters and degradability. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:1328-34. [DOI: 10.1016/j.msec.2016.08.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/18/2016] [Accepted: 08/08/2016] [Indexed: 12/12/2022]
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Sapkota M, Kharbanda KK, Wyatt TA. Malondialdehyde-Acetaldehyde-Adducted Surfactant Protein Alters Macrophage Functions Through Scavenger Receptor A. Alcohol Clin Exp Res 2016; 40:2563-2572. [PMID: 27783409 PMCID: PMC5133169 DOI: 10.1111/acer.13248] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 09/20/2016] [Indexed: 11/26/2022]
Abstract
BACKGROUND Reactive aldehydes such as acetaldehyde and malondialdehyde generated as a result of alcohol metabolism and cigarette smoke exposure lead to the formation of malondialdehyde-acetaldehyde-adducted proteins (MAA adducts). These aldehydes can adduct to different proteins such as bovine serum albumin and surfactant protein A or surfactant protein D (SPD). Macrophages play an important role in innate immunity, but the effect of MAA adducts on macrophage function has not yet been examined. Because macrophage scavenger receptor A (SRA; CD204) mediates the uptake of modified proteins, we hypothesized that the effects of MAA-modified proteins on macrophage function are primarily mediated through SRA. METHODS We tested this hypothesis by exposing SPD-MAA to macrophages and measuring functions. SPD-MAA treatment significantly stimulated pro-inflammatory cytokine tumor necrosis factor-alpha (TNF-α) release in the macrophage cell line, RAW 264.7. RESULTS A significant reduction in phagocytosis of zymosan particles was also observed. SPD-MAA stimulated a significant dose-dependent increase in TNF-α and interleukin (IL)-6 release from peritoneal macrophages (PMs) of wild-type (WT) mice. But significantly less TNF-α and IL-6 were released from PMs of SRA-/- mice. We observed a significant reduction in phagocytosis of zymosan particles in PMs from WT mice treated with SPD-MAA. No further SPD-MAA-induced reduction was seen in PMs from SRA-/- mice. SPD-MAA treatment significantly increased SRA mRNA expression, but had no effect on surface receptor protein expression. Protein kinase C alpha inhibitor and NF-κB inhibitor significantly reduced pro-inflammatory cytokine release in response to SPD-MAA. CONCLUSIONS In conclusion, our data demonstrate that SRA is important for MAA-adducted protein-mediated effect on macrophage functions.
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Affiliation(s)
- Muna Sapkota
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE, USA
| | | | - Todd A. Wyatt
- Department of Environmental, Agricultural and Occupational Health, College of Public Health, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Internal Medicine, Division of Pulmonary, Critical Care, Sleep and Allergy University of Nebraska Medical Center, Omaha, NE, USA
- VA Nebraska-Western Iowa Health Care System, Omaha, NE, USA
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Analysis of Lipoasiprated Following Centrifugation: Wet Versus Dry Harvesting Technique. J Craniofac Surg 2016; 27:1489-93. [PMID: 27607119 DOI: 10.1097/scs.0000000000002834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND The success of lipotransfer strongly depends on the harvesting, processing, and placement of the lipoaspirated samples. This study was designed to assess the histomorphometric characteristics and viability of fat harvested using different techniques (wet and dry) following centrifugation, as described by Coleman. METHODS The study enrolled 85 consecutive, nonrandomized, healthy patients from March 2010 to December 2014 (45 males and 40 females). The mean age was 40 years (range, 18-59 years), and the mean body mass index was 25.8 (range, 24-32). The authors performed a histological analysis (hematoxylin/eosin), morphometry (ImageJ 1.33 free-share image analysis software), and a viability assessment (Trypan Blue exclusion test; Sigma-Aldrich, Milan, Italy) of the lipoaspirated samples. RESULTS The hematoxylin and eosin-stained sections exhibited similar features; in particular, clear-cut morphological signs of adipocyte disruption, apoptosis, or necrosis were not detected in the examined samples. Morphometry confirmed the visual findings, and the values of the mean surface area of the adipocyte vacuoles were not significantly different. Additionally, the adipocyte viability was not significantly different in the analyzed fat tissue samples. CONCLUSIONS The results from this study showed, for the first time, that there is not a reduction in the viability of fat grafts harvested with the dry or wet technique following centrifugation according to Coleman technique. Both methods of fat harvesting collect viable cells, which are not influenced by standard centrifugation. The fat grafts harvested and processed by this technique could be used in clinical settings without increasing the reabsorption rate. LEVEL OF EVIDENCE V.
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Zhao S, Chen Y, Partlow BP, Golding AS, Tseng P, Coburn J, Applegate MB, Moreau JE, Omenetto FG, Kaplan DL. Bio-functionalized silk hydrogel microfluidic systems. Biomaterials 2016; 93:60-70. [PMID: 27077566 DOI: 10.1016/j.biomaterials.2016.03.041] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 03/05/2016] [Accepted: 03/28/2016] [Indexed: 12/16/2022]
Abstract
Bio-functionalized microfluidic systems were developed based on a silk protein hydrogel elastomeric materials. A facile multilayer fabrication method using gelatin sacrificial molding and layer-by-layer assembly was implemented to construct interconnected, three dimensional (3D) microchannel networks in silk hydrogels at 100 μm minimum feature resolution. Mechanically activated valves were implemented to demonstrate pneumatic control of microflow. The silk hydrogel microfluidics exhibit controllable mechanical properties, long-term stability in various environmental conditions, tunable in vitro and in vivo degradability in addition to optical transparency, providing unique features for cell/tissue-related applications than conventional polydimethylsiloxane (PDMS) and existing hydrogel-based microfluidic options. As demonstrated in the work here, the all aqueous-based fabrication process at ambient conditions enabled the incorporation of active biological substances in the bulk phase of these new silk microfluidic systems during device fabrication, including enzymes and living cells, which are able to interact with the fluid flow in the microchannels. These silk hydrogel-based microfluidic systems offer new opportunities in engineering active diagnostic devices, tissues and organs that could be integrated in vivo, and for on-chip cell sensing systems.
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Affiliation(s)
- Siwei Zhao
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Ying Chen
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Benjamin P Partlow
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Anne S Golding
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Peter Tseng
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Jeannine Coburn
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Matthew B Applegate
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Jodie E Moreau
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - Fiorenzo G Omenetto
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, 4 Colby St. Medford, MA 02155, USA.
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Lin X, Li Y, Leung PH, Li J, Hu J, Liu X, Li Z. Temperature induced modulation of lipid oxidation and lipid accumulation in palmitate-mediated 3T3-L1 adipocytes and 3T3-L1 adipocytes. J Therm Biol 2016; 58:1-7. [PMID: 27157327 DOI: 10.1016/j.jtherbio.2016.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 03/12/2016] [Accepted: 03/17/2016] [Indexed: 01/14/2023]
Abstract
Human skin temperature can vary widely depending on anatomical location and ambient temperature. It is also known that local changes in skin and subcutaneous temperature can affect fat metabolism. This study aimed to explore the potential effects of surrounding thermal environment on fat by investigating cell viability, lipid oxidation, and lipid accumulation in 3T3-L1 adipocytes and palmitate-treated adipocytes after 4h incubation. No significant differences of viability in 3T3-L1 adipocytes were detected under different temperature conditions. Despite no significant increase being observed under warm temperature (39°C) conditions, a similarly significant suppression of intracellular reactive oxygen species (ROS) and lipid peroxidation were found in 3T3-L1 adipocytes and palmitate-treated adipocytes under 4h exposure to cooler temperatures of 31-33°C (P<0.01). ROS, chemically reactive molecules containing oxygen, are currently understood to be a major contributor to oxidantive stress in obesity. Additionally, cooler temperatures (31-33°C) could improve the size of lipid droplets in 3T3-L1 adipocytes (P<0.01), but no significant effect was generated by temperature change on lipid droplets in palmitate-treated adipocytes. In the palmitate-induced adiposity model, although excessive ROS and lipid peroxidation has been attenuated by temperature decrease (P<0.01), it still does not positively modulate lipid droplet size (P>0.05) and remedy the palmitate damage induced cell death (P<0.01). These findings provide preliminary support for potential interventions based on temperature manipulation for cell metabolism of adipocytes.
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Affiliation(s)
- Xiaofen Lin
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Yi Li
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China; School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom.
| | - Polly Hangmei Leung
- Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
| | - Jiashen Li
- School of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Junyan Hu
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
| | - Xuan Liu
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
| | - Zhi Li
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
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Yin PT, Shah S, Pasquale NJ, Garbuzenko OB, Minko T, Lee KB. Stem cell-based gene therapy activated using magnetic hyperthermia to enhance the treatment of cancer. Biomaterials 2015; 81:46-57. [PMID: 26720500 DOI: 10.1016/j.biomaterials.2015.11.023] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 11/10/2015] [Indexed: 01/14/2023]
Abstract
Stem cell-based gene therapies, wherein stem cells are genetically engineered to express therapeutic molecules, have shown tremendous potential for cancer applications owing to their innate ability to home to tumors. However, traditional stem cell-based gene therapies are hampered by our current inability to control when the therapeutic genes are actually turned on, thereby resulting in detrimental side effects. Here, we report the novel application of magnetic core-shell nanoparticles for the dual purpose of delivering and activating a heat-inducible gene vector that encodes TNF-related apoptosis-inducing ligand (TRAIL) in adipose-derived mesenchymal stem cells (AD-MSCs). By combining the tumor tropism of the AD-MSCs with the spatiotemporal MCNP-based delivery and activation of TRAIL expression, this platform provides an attractive means with which to enhance our control over the activation of stem cell-based gene therapies. In particular, we found that these engineered AD-MSCs retained their innate ability to proliferate, differentiate, and, most importantly, home to tumors, making them ideal cellular carriers. Moreover, exposure of the engineered AD-MSCS to mild magnetic hyperthermia resulted in the selective expression of TRAIL from the engineered AD-MSCs and, as a result, induced significant ovarian cancer cell death in vitro and in vivo.
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Affiliation(s)
- Perry T Yin
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Shreyas Shah
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Nicholas J Pasquale
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Olga B Garbuzenko
- Department of Pharmaceutics, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Tamara Minko
- Department of Pharmaceutics, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA; Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, 08903, USA
| | - Ki-Bum Lee
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA; Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA.
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