1
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Altun E, Bayram C, Gultekinoglu M, Matharu R, Delbusso A, Homer-Vanniasinkam S, Edirisinghe M. Pressure-Spun Fibrous Surgical Sutures for Localized Antibacterial Delivery: Development, Characterization, and In Vitro Evaluation. ACS Appl Mater Interfaces 2023; 15:45561-45573. [PMID: 37729472 PMCID: PMC10561146 DOI: 10.1021/acsami.3c07956] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Accepted: 09/06/2023] [Indexed: 09/22/2023]
Abstract
Surgical sutures designed to prevent infection are critical in addressing antibiotic-resistant pathogens that cause surgical site infections. Instead of antibiotics, alternative materials such as biocides have been assessed for coating commercially used sutures due to emerging antibiotic resistance concerns worldwide. This study has a new approach to the development of fibrous surgical sutures with the ability to deliver localized antibacterial agents. A new manufacturing process based on pressure spinning was used for the first time in the production of fibrous surgical sutures by physically blending antibacterial triclosan (Tri) agent with poly(lactic-co-glycolic acid) (PLGA) and poly(ethylene oxide) (PEO) polymers. Fibrous surgical sutures with virgin PLGA, virgin PEO, different ratios of PLGA-PEO, and different ratios of Tri-loaded PLGA-PEO fibrous sutures were produced to mimic the FDA- and NICE-approved PLGA-based sutures available in the market and compared for their characteristics. They were also tested simultaneously with commercially available sutures to compare their in vitro biodegradation, antibacterial, drug release, and cytotoxicity properties. After in vitro antibacterial testing for 24 h, sutures having 285 ± 12 μg/mg Tri loading were selected as a model for further testing as they exhibited antibacterial activity against all tested bacteria strains. The selected model of antibacterial fibrous sutures exhibited an initial burst of Tri release within 24 h, followed by a sustained release for the remaining time until the sutures completely degraded within 21 days. The cell viability assay showed that these surgical sutures had no cytotoxic effect on mammalian cells.
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Affiliation(s)
- Esra Altun
- Department
of Mechanical Engineering, University College
London (UCL), Torrington Place, London WC1E 7JE, U.K.
| | - Cem Bayram
- Department
of Nanotechnology and Nanomedicine, Graduate School of Science and
Engineering, Hacettepe University, Ankara 06800, Turkey
| | - Merve Gultekinoglu
- Department
of Nanotechnology and Nanomedicine, Graduate School of Science and
Engineering, Hacettepe University, Ankara 06800, Turkey
| | - Rupy Matharu
- Department
of Civil, Environmental and Geomatic Engineering, University College London, Gower Street, London WC1E
6BT, U.K.
| | - Angelo Delbusso
- Department
of Mechanical Engineering, University College
London (UCL), Torrington Place, London WC1E 7JE, U.K.
| | | | - Mohan Edirisinghe
- Department
of Mechanical Engineering, University College
London (UCL), Torrington Place, London WC1E 7JE, U.K.
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2
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Srivastava I, Moitra P, Brent KM, Wang K, Pandit S, Altun E, Pan D. Biodegradable and switchable near-infrared fluorescent probes for hypoxia detection. Nanomedicine (Lond) 2023; 18:1061-1073. [PMID: 37610080 DOI: 10.2217/nnm-2023-0095] [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] [Indexed: 08/24/2023] Open
Abstract
Aims: Among solid tumors, hypoxia is a common characteristic and responsible for chemotherapeutic resistance. Hypoxia-sensitive imaging probes are therefore essential for early tumor detection, growth monitoring and drug-response evaluation. Despite significant efforts, detecting hypoxic oxygen levels remains challenging. Materials & methods: This paper demonstrates the use of an amine-rich carbon dot probe functionalized with an imidazole group that exhibits reversible fluorescence switching in normoxic and hypoxic environments. Results & conclusion: We demonstrate the ability to emit near-infrared light only under hypoxic conditions. The probes are found to be biodegradable in the presence of human digestive enzymes such as lipase. Ex vivo tissue imaging experiments revealed promising near-infrared signals even at a depth of 5 mm for the probe under ex vivo imaging conditions.
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Affiliation(s)
- Indrajit Srivastava
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
| | - Parikshit Moitra
- Department of Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | - Kurtis M Brent
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
| | - Kevin Wang
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
| | - Subhendu Pandit
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
| | - Esra Altun
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
| | - Dipanjan Pan
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Mills Breast Cancer Institute, Carle Foundation Hospital, Urbana, IL 61801, USA
- Department of Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA
- Huck Institutes of the Life Sciences, University Park, PA 16802, USA
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3
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Lycke R, Kim R, Zolotavin P, Montes J, Sun Y, Koszeghy A, Altun E, Noble B, Yin R, He F, Totah N, Xie C, Luan L. Low-threshold, high-resolution, chronically stable intracortical microstimulation by ultraflexible electrodes. Cell Rep 2023; 42:112554. [PMID: 37235473 PMCID: PMC10592461 DOI: 10.1016/j.celrep.2023.112554] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/08/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
Intracortical microstimulation (ICMS) enables applications ranging from neuroprosthetics to causal circuit manipulations. However, the resolution, efficacy, and chronic stability of neuromodulation are often compromised by adverse tissue responses to the indwelling electrodes. Here we engineer ultraflexible stim-nanoelectronic threads (StimNETs) and demonstrate low activation threshold, high resolution, and chronically stable ICMS in awake, behaving mouse models. In vivo two-photon imaging reveals that StimNETs remain seamlessly integrated with the nervous tissue throughout chronic stimulation periods and elicit stable, focal neuronal activation at low currents of 2 μA. Importantly, StimNETs evoke longitudinally stable behavioral responses for over 8 months at a markedly low charge injection of 0.25 nC/phase. Quantified histological analyses show that chronic ICMS by StimNETs induces no neuronal degeneration or glial scarring. These results suggest that tissue-integrated electrodes provide a path for robust, long-lasting, spatially selective neuromodulation at low currents, which lessens risk of tissue damage or exacerbation of off-target side effects.
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Affiliation(s)
- Roy Lycke
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Robin Kim
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Pavlo Zolotavin
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Jon Montes
- Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA; Department of Bioengineering, Rice University, Houston, TX 77005, USA
| | - Yingchu Sun
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Aron Koszeghy
- Helsinki Institute of Life Science (HiLIFE), University of Helsinki, 00790 Helsinki, Finland
| | - Esra Altun
- Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA; Material Science and NanoEngineering, Rice University, Houston, TX 77005, USA
| | - Brian Noble
- Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA; Applied Physics Program, Rice University, Houston, TX 77005, USA
| | - Rongkang Yin
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Fei He
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA
| | - Nelson Totah
- Helsinki Institute of Life Science (HiLIFE), University of Helsinki, 00790 Helsinki, Finland; Faculty of Pharmacy, University of Helsinki, 00790 Helsinki, Finland
| | - Chong Xie
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA; Department of Bioengineering, Rice University, Houston, TX 77005, USA.
| | - Lan Luan
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA; Rice Neuroengineering Initiative, Rice University, Houston, TX 77005, USA; Department of Bioengineering, Rice University, Houston, TX 77005, USA.
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4
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Lycke R, Kim R, Zolotavin P, Montes J, Sun Y, Koszeghy A, Altun E, Noble B, Yin R, He F, Totah N, Xie C, Luan L. Low-threshold, high-resolution, chronically stable intracortical microstimulation by ultraflexible electrodes. bioRxiv 2023:2023.02.20.529295. [PMID: 36865195 PMCID: PMC9980065 DOI: 10.1101/2023.02.20.529295] [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] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Intracortical microstimulation (ICMS) enables applications ranging from neuroprosthetics to causal circuit manipulations. However, the resolution, efficacy, and chronic stability of neuromodulation is often compromised by the adverse tissue responses to the indwelling electrodes. Here we engineer ultraflexible stim-Nanoelectronic Threads (StimNETs) and demonstrate low activation threshold, high resolution, and chronically stable ICMS in awake, behaving mouse models. In vivo two-photon imaging reveals that StimNETs remain seamlessly integrated with the nervous tissue throughout chronic stimulation periods and elicit stable, focal neuronal activation at low currents of 2 μA. Importantly, StimNETs evoke longitudinally stable behavioral responses for over eight months at markedly low charge injection of 0.25 nC/phase. Quantified histological analysis show that chronic ICMS by StimNETs induce no neuronal degeneration or glial scarring. These results suggest that tissue-integrated electrodes provide a path for robust, long-lasting, spatially-selective neuromodulation at low currents which lessen risks of tissue damage or exacerbation of off-target side-effects.
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Affiliation(s)
- Roy Lycke
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Robin Kim
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Pavlo Zolotavin
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Jon Montes
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
- Department of Bioenginering; Rice University; Houston; Texas; 77005, United States
| | - Yingchu Sun
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Aron Koszeghy
- Helsinki Institute of Life Science (HiLIFE); University of Helsinki; Helsinki; 00790; Finland
| | - Esra Altun
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
- Material Science and NanoEngineering; Rice University; Houston; Texas; 77005, United States
| | - Brian Noble
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
- Applied Physics Program; Rice University; Houston; Texas; 77005, United States
| | - Rongkang Yin
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Fei He
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
| | - Nelson Totah
- Helsinki Institute of Life Science (HiLIFE); University of Helsinki; Helsinki; 00790; Finland
- Faculty of Pharmacy; University of Helsinki; Helsinki; 00790; Finland
| | - Chong Xie
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
- Department of Bioenginering; Rice University; Houston; Texas; 77005, United States
| | - Lan Luan
- Department of Electrical and Computer Engineering; Rice University; Houston; Texas; 77005, United States
- Rice Neuroengineering Initiative; Rice University; Houston; Texas; 77005, United States
- Department of Bioenginering; Rice University; Houston; Texas; 77005, United States
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5
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Quezada A, Ward C, Bader ER, Zolotavin P, Altun E, Hong S, Killian NJ, Xie C, Batista-Brito R, Hébert JM. An In Vivo Platform for Rebuilding Functional Neocortical Tissue. Bioengineering (Basel) 2023; 10:263. [PMID: 36829757 PMCID: PMC9952056 DOI: 10.3390/bioengineering10020263] [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: 12/29/2022] [Revised: 01/24/2023] [Accepted: 02/13/2023] [Indexed: 02/19/2023] Open
Abstract
Recent progress in cortical stem cell transplantation has demonstrated its potential to repair the brain. However, current transplant models have yet to demonstrate that the circuitry of transplant-derived neurons can encode useful function to the host. This is likely due to missing cell types within the grafts, abnormal proportions of cell types, abnormal cytoarchitecture, and inefficient vascularization. Here, we devised a transplant platform for testing neocortical tissue prototypes. Dissociated mouse embryonic telencephalic cells in a liquid scaffold were transplanted into aspiration-lesioned adult mouse cortices. The donor neuronal precursors differentiated into upper and deep layer neurons that exhibited synaptic puncta, projected outside of the graft to appropriate brain areas, became electrophysiologically active within one month post-transplant, and responded to visual stimuli. Interneurons and oligodendrocytes were present at normal densities in grafts. Grafts became fully vascularized by one week post-transplant and vessels in grafts were perfused with blood. With this paradigm, we could also organize cells into layers. Overall, we have provided proof of a concept for an in vivo platform that can be used for developing and testing neocortical-like tissue prototypes.
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Affiliation(s)
- Alexandra Quezada
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Stem Cell Institute, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Claire Ward
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Edward R. Bader
- Department of Neurological Surgery, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Pavlo Zolotavin
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
| | - Esra Altun
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
| | - Sarah Hong
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Nathaniel J. Killian
- Department of Neurological Surgery, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Chong Xie
- Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA
| | - Renata Batista-Brito
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Psychiatry and Behavioral Sciences, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Jean M. Hébert
- Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Stem Cell Institute, Albert Einstein College of Medicine, Bronx, NY 10461, USA
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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6
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Young M, Thapa D, Moon A, Kim H, Beyer C, Sanders E, Wang K, McGinty K, Burke L, Altun E, Zhang X, Tan X, Tepper J, Yanagihara T. Disease Control and Hepatotoxicity Following Stereotactic Body Radiotherapy for Hepatocellular Carcinoma. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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7
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Ostadhossein F, Moitra P, Altun E, Dutta D, Sar D, Tripathi I, Hsiao SH, Kravchuk V, Nie S, Pan D. Function-adaptive clustered nanoparticles reverse Streptococcus mutans dental biofilm and maintain microbiota balance. Commun Biol 2021; 4:846. [PMID: 34267305 PMCID: PMC8282845 DOI: 10.1038/s42003-021-02372-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 10/20/2020] [Accepted: 06/16/2021] [Indexed: 01/16/2023] Open
Abstract
Dental plaques are biofilms that cause dental caries by demineralization with acidogenic bacteria. These bacteria reside inside a protective sheath which makes any curative treatment challenging. We propose an antibiotic-free strategy to disrupt the biofilm by engineered clustered carbon dot nanoparticles that function in the acidic environment of the biofilms. In vitro and ex vivo studies on the mature biofilms of Streptococcus mutans revealed >90% biofilm inhibition associated with the contact-mediated interaction of nanoparticles with the bacterial membrane, excessive reactive oxygen species generation, and DNA fragmentation. An in vivo examination showed that these nanoparticles could effectively suppress the growth of S. mutans. Importantly, 16S rRNA analysis of the dental microbiota showed that the diversity and richness of bacterial species did not substantially change with nanoparticle treatment. Overall, this study presents a safe and effective approach to decrease the dental biofilm formation without disrupting the ecological balance of the oral cavity.
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Affiliation(s)
- Fatemeh Ostadhossein
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Parikshit Moitra
- Department of Pediatrics, Center for Blood Oxygen Transport and Hemostasis, Health Sciences Facility III, University of Maryland Baltimore School of Medicine, Baltimore, MD, USA
| | - Esra Altun
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Debapriya Dutta
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Dinabandhu Sar
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Indu Tripathi
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Shih-Hsuan Hsiao
- Veterinary Diagnostic Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Valeriya Kravchuk
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA
| | - Shuming Nie
- Departments of Bioengineering, Carle Illinois College of Medicine, Beckman Institute, Department of Chemistry, Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Dipanjan Pan
- Departments of Bioengineering, Beckman Institute, University of Illinois at Urbana-Champaign, Mills Breast Cancer Institute, and Carle Foundation Hospital, Urbana, IL, USA.
- Department of Pediatrics, Center for Blood Oxygen Transport and Hemostasis, Health Sciences Facility III, University of Maryland Baltimore School of Medicine, Baltimore, MD, USA.
- Department of Diagnostic Radiology and Nuclear Medicine, Health Sciences Facility III, University of Maryland Baltimore, Baltimore, MD, USA.
- Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, Interdisciplinary Health Sciences Facility, Baltimore, MD, USA.
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8
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Altun E, Yuca E, Ekren N, Kalaskar DM, Ficai D, Dolete G, Ficai A, Gunduz O. Kinetic Release Studies of Antibiotic Patches for Local Transdermal Delivery. Pharmaceutics 2021; 13:pharmaceutics13050613. [PMID: 33922739 PMCID: PMC8145298 DOI: 10.3390/pharmaceutics13050613] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [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: 03/15/2021] [Revised: 04/15/2021] [Accepted: 04/19/2021] [Indexed: 12/12/2022] Open
Abstract
This study investigates the usage of electrohydrodynamic (EHD)-3D printing for the fabrication of bacterial cellulose (BC)/polycaprolactone (PCL) patches loaded with different antibiotics (amoxicillin (AMX), ampicillin (AMP), and kanamycin (KAN)) for transdermal delivery. The composite patches demonstrated facilitated drug loading and encapsulation efficiency of drugs along with extended drug release profiles. Release curves were also subjected to model fitting, and it was found that drug release was optimally adapted to the Higuchi square root model for each drug. They performed a time-dependent and diffusion-controlled release from the patches and followed Fick’s diffusion law by the Korsmeyer–Peppas energy law equation. Moreover, produced patches demonstrated excellent antimicrobial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) strains, so they could be helpful in the treatment of chronic infectious lesions during wound closures. As different tests have confirmed, various types of antibiotics could be loaded and successfully released regardless of their types from produced BC/PCL patches. This study could breathe life into the production of antibiotic patches for local transdermal applications in wound dressing studies and improve the quality of life of patients.
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Affiliation(s)
- Esra Altun
- Centre for Nanotechnology & Biomaterials Research, Department of Metallurgical and Materials Engineering, Faculty of Technology, Goztepe Campus, Marmara University, Istanbul 34722, Turkey;
| | - Esra Yuca
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Davutpasa Campus, Yildiz Technical University, Istanbul 34220, Turkey;
| | - Nazmi Ekren
- Centre for Nanotechnology & Biomaterials Research, Department of Electrical-Electronics Engineering, Faculty of Technology, Goztepe Campus, Marmara University, Istanbul 34722, Turkey;
| | - Deepak M. Kalaskar
- UCL Division of Surgery and Interventional Science, Royal Free Hospital Campus, University College London, Rowland Hill Street, London NW3 2PF, UK
- Correspondence: (D.M.K.); (A.F.); (O.G.)
| | - Denisa Ficai
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania;
- National Centre for Micro- and Nanomaterials, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania;
| | - Georgiana Dolete
- National Centre for Micro- and Nanomaterials, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania;
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
| | - Anton Ficai
- National Centre for Micro- and Nanomaterials, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania;
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania
- Academy of Romanian Scientists, 060042 Bucharest, Romania
- Correspondence: (D.M.K.); (A.F.); (O.G.)
| | - Oguzhan Gunduz
- Centre for Nanotechnology & Biomaterials Research, Department of Metallurgical and Materials Engineering, Faculty of Technology, Goztepe Campus, Marmara University, Istanbul 34722, Turkey;
- Correspondence: (D.M.K.); (A.F.); (O.G.)
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9
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Aydogdu MO, Altun E, Chung E, Ren G, Homer-Vanniasinkam S, Chen B, Edirisinghe M. Surface interactions and viability of coronaviruses. J R Soc Interface 2021; 18:20200798. [PMID: 33402019 PMCID: PMC7879773 DOI: 10.1098/rsif.2020.0798] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 12/07/2020] [Indexed: 12/19/2022] Open
Abstract
The recently emerged coronavirus pandemic (COVID-19) has become a worldwide threat affecting millions of people, causing respiratory system related problems that can end up with extremely serious consequences. As the infection rate rises significantly and this is followed by a dramatic increase in mortality, the whole world is struggling to accommodate change and is trying to adapt to new conditions. While a significant amount of effort is focused on developing a vaccine in order to make a game-changing anti-COVID-19 breakthrough, novel coronavirus (SARS-CoV-2) is also developing mutations rapidly as it transmits just like any other virus and there is always a substantial chance of the invented antibodies becoming ineffective as a function of time, thus failing to inhibit virus-to-cell binding efficiency as the spiked protein keeps evolving. Hence, controlling the transmission of the virus is crucial. Therefore, this review summarizes the viability of coronaviruses on inanimate surfaces under different conditions while addressing the current state of known chemical disinfectants for deactivation of the coronaviruses. The review attempts to bring together a wide spectrum of surface-virus-cleaning agent interactions to help identify material selection for inanimate surfaces that have frequent human contact and cleaning procedures for effective prevention of COVID-19 transmission.
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Affiliation(s)
- Mehmet Onur Aydogdu
- Department of Mechanical Engineering, University College London (UCL), Torrington Place, London WC1E 7JE, UK
| | - Esra Altun
- Department of Mechanical Engineering, University College London (UCL), Torrington Place, London WC1E 7JE, UK
| | - Etelka Chung
- Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK
| | - Guogang Ren
- Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB, UK
| | | | - Biqiong Chen
- School of Mechanical and Aerospace Engineering, Queen's University Belfast, Belfast BT7 1NN, UK
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London (UCL), Torrington Place, London WC1E 7JE, UK
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10
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Aydogdu MO, Altun E, Ahmed J, Gunduz O, Edirisinghe M. Fiber Forming Capability of Binary and Ternary Compositions in the Polymer System: Bacterial Cellulose-Polycaprolactone-Polylactic Acid. Polymers (Basel) 2019; 11:E1148. [PMID: 31277438 PMCID: PMC6681128 DOI: 10.3390/polym11071148] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 05/21/2019] [Revised: 06/20/2019] [Accepted: 06/25/2019] [Indexed: 02/07/2023] Open
Abstract
Bacterial Cellulose (BC) has over recent decades shown great versatility in wound healing dressings, but is difficult to spin fibers with at high concentrations. An investigation into the preparation of bandage-like fibrous meshes is carried out to determine the optimal blend of polycaprolactone (PCL) and polylactic acid (PLA) as a suitable carrier for BC. Using a simple centrifugal spinning setup, polymer blends of PCL, PLA and BC are investigated as a ternary system to determine the most suitable composition with a focus on achieving maximal BC concentration. It is found that BC content in the fibers above 10 wt % reduced product yield. By creating blends of PLA-PCL fibers, we can create a more suitable system in terms of yield and mechanical properties. The fibrous samples are examined for yield, fiber morphology using scanning electron microscopy, mechanical properties using tensile testing and chemical characteristics using Fourier-transform infrared spectroscopy. A fibrous scaffold with > 30 wt % BC was produced with enhanced mechanical properties owing to the blending of PLA and PCL.
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Affiliation(s)
- Mehmet Onur Aydogdu
- Centre for Nanotechnology & Biomaterials Research, Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722 Istanbul, Turkey
| | - Esra Altun
- Centre for Nanotechnology & Biomaterials Research, Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722 Istanbul, Turkey
| | - Jubair Ahmed
- Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
| | - Oguzhan Gunduz
- Centre for Nanotechnology & Biomaterials Research, Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722 Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Goztepe Campus, 34722 Istanbul, Turkey
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK.
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Altun E, Aydogdu MO, Togay SO, Sengil AZ, Ekren N, Haskoylu ME, Oner ET, Altuncu NA, Ozturk G, Crabbe-Mann M, Ahmed J, Gunduz O, Edirisinghe M. Bioinspired scaffold induced regeneration of neural tissue. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.02.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Ahmed J, Altun E, Aydogdu MO, Gunduz O, Kerai L, Ren G, Edirisinghe M. Anti-fungal bandages containing cinnamon extract. Int Wound J 2019; 16:730-736. [PMID: 30767437 PMCID: PMC6849878 DOI: 10.1111/iwj.13090] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [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: 11/21/2018] [Revised: 01/09/2019] [Accepted: 01/14/2019] [Indexed: 02/04/2023] Open
Abstract
Cinnamon‐containing polycaprolactone (PCL) bandages were produced by pressurised gyration and their anti‐fungal activities against Candida albicans were investigated. It was found that by preparing and spinning polymer solutions of cinnamon with PCL, fibres capable of inhibiting fungal growth could be produced, as observed in disk diffusion tests for anti‐fungal susceptibility. Fascinatingly, compared with raw cinnamon powder, the novel cinnamon‐loaded fibres had outstanding long‐term activity. The results presented here are very promising and may indeed accelerate a new era of using completely natural materials in biomedical applications, especially in wound healing.
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Affiliation(s)
- Jubair Ahmed
- Department of Mechanical Engineering, University College London, London, UK
| | - Esra Altun
- Department of Metallurgical and Materials Engineering, University of Marmara, Istanbul, Turkey
| | - Mehmet O Aydogdu
- Department of Metallurgical and Materials Engineering, University of Marmara, Istanbul, Turkey
| | - Oguzhan Gunduz
- Department of Metallurgical and Materials Engineering, University of Marmara, Istanbul, Turkey
| | - Laxmi Kerai
- School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK
| | - Guogang Ren
- School of Engineering and Technology, University of Hertfordshire, Hertfordshire, UK
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London, London, UK
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Altun E, Avci E, Yildirim T, Yildirim S. PROTECTIVE EFFECT OF NIGELLA SATIVA OIL ON MYOCARDIUM IN STREPTOZOTOCIN-INDUCED DIABETIC RATS. Acta Endocrinol (Buchar) 2019; 15:289-294. [PMID: 32010345 DOI: 10.4183/aeb.2019.289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Background To evaluate the protective effect of Nigella sativa oil (NSO) on the myocardium in streptozotocin-induced diabetic rats. Materials and methods Thirty-two 7-8-week-old female Wistar albino rats (300-350 g) were equally divided into 4 groups: nondiabetic untreated animals (control), diabetes mellitus (DM), NSO, and DM+NSO groups. For the induction of diabetes, 45 mg/kg streptozotocin was applied to the rats in the DM and DM+NSO groups as a single intraperitoneal dose. NSO (400 mg/kg) was orally administered through an intragastric catheter once a day over 21 days. Formalin-fixed, paraffin-embedded tissue sections of the myocardium were evaluated histopathologically and immunohistochemically. Results Compared to the control, NSO, and DM+NSO groups, the myocardial tissue samples from the rats in the DM group had significantly higher myositis, hyaline degeneration, and Zenker's necrosis. Moreover, the Bcl-2 expressions were significantly higher in the control, NSO, and DM+NSO groups than in the DM group. Conclusion NSO has a protective effect on the myocardium of streptozotocin-induced diabetic rats, most likely via suppressing apoptosis.
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Affiliation(s)
- E Altun
- Balikesir University, School of Medicine - Dept. of Pathology, Balikesir, Turkey
| | - E Avci
- Balikesir University, School of Medicine - Dept. of Cardiology, Balikesir University, School of Medicine, Turkey
| | - T Yildirim
- Balikesir University, School of Medicine - Dept. of Cardiology, Balikesir University, School of Medicine, Turkey
| | - S Yildirim
- Ataturk University - Faculty of Veterinary Medicine, Dept. of Pathology, Erzurum, Turkey
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Yeniay E, Öcal L, Altun E, Giray B, Nuzhet Oktar F, Talat Inan A, Ekren N, Kilic O, Gunduz O. Nanofibrous wound dressing material by electrospinning method. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2018.1525718] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Eda Yeniay
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
| | - Leyla Öcal
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
| | - Esra Altun
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Master of Science, Institute of Pure and Applied Sciences, Marmara University, Istanbul, Turkey
| | - Betul Giray
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Medipol University, Istanbul, Turkey
| | - Faik Nuzhet Oktar
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Bioengineer, Faculty of Engineer, Marmara University, Istanbul, Turkey
| | - Ahmet Talat Inan
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Mechanical Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
| | - Nazmi Ekren
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Electrical-Electronics Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
| | - Osman Kilic
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Electrical and Electronics Engineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Oguzhan Gunduz
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
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Topsakal A, Uzun M, Ugar G, Ozcan A, Altun E, Oktar FN, Ikram F, Ozkan O, Turkoglu Sasmazel H, Gunduz O. Development of Amoxicillin-Loaded Electrospun Polyurethane/Chitosan/ $\beta$ -Tricalcium Phosphate Scaffold for Bone Tissue Regeneration. IEEE Trans Nanobioscience 2018; 17:321-328. [PMID: 29994218 DOI: 10.1109/tnb.2018.2844870] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Biocompatible nanocomposite electrospun fibers containing Polyurethane/Chitosan/ $\beta $ -Tri calcium phosphate with diverse concentrations were designed and produced through the electrospinning process for bone tissue engineering applications. After the production process, density measurement, viscosity, electrical conductivity, and tensile strength measurement tests were carried out as physical analyses of blended solutions. The chemical structural characterization was scrutinized using Fourier transform infrared spectrometer (FTIR), and scanning electron microscopy (SEM) was used to observe the morphological details of developed electrospun scaffolds. Cell viability, attachment, and proliferation were performed using a L929 fibroblast cell line. Based on the physical, SEM, FTIR analysis, and cell culture studies, preferable nanofiber composition was selected for further studies. Amoxicillin (AMX) was loaded to that selected nanofiber composition for examination of the drug release. In comparison with other studies on similar AMX controlled products, higher drug loading and encapsulation efficiencies were obtained. It has been clearly found that the developed nanofiber composites have potential for bone tissue engineering applications.
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Aydogdu MO, Altun E, Crabbe-Mann M, Brako F, Koc F, Ozen G, Kuruca SE, Edirisinghe U, Luo CJ, Gunduz O, Edirisinghe M. Cellular interactions with bacterial cellulose: Polycaprolactone nanofibrous scaffolds produced by a portable electrohydrodynamic gun for point-of-need wound dressing. Int Wound J 2018; 15:789-797. [PMID: 29806201 DOI: 10.1111/iwj.12929] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 03/26/2018] [Accepted: 04/04/2018] [Indexed: 01/10/2023] Open
Abstract
Electrospun nanofibrous scaffolds are promising regenerative wound dressing options but have yet to be widely used in practice. The challenge is that nanofibre productions rely on bench-top apparatuses, and the delicate product integrity is hard to preserve before reaching the point of need. Timing is critically important to wound healing. The purpose of this investigation is to produce novel nanofibrous scaffolds using a portable, hand-held "gun", which enables production at the wound site in a time-dependent fashion, thereby preserving product integrity. We select bacterial cellulose, a natural hydrophilic biopolymer, and polycaprolactone, a synthetic hydrophobic polymer, to generate composite nanofibres that can tune the scaffold hydrophilicity, which strongly affects cell proliferation. Composite scaffolds made of 8 different ratios of bacterial cellulose and polycaprolactone were successfully electrospun. The morphological features and cell-scaffold interactions were analysed using scanning electron microscopy. The biocompatibility was studied using Saos-2 cell viability test. The scaffolds were found to show good biocompatibility and allow different proliferation rates that varied with the composition of the scaffolds. A nanofibrous dressing that can be accurately moulded and standardised via the portable technique is advantageous for wound healing in practicality and in its consistency through mass production.
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Affiliation(s)
- Mehmet Onur Aydogdu
- Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
| | - Esra Altun
- Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
| | - Maryam Crabbe-Mann
- Department of Mechanical Engineering, University College London (UCL), London, UK
| | - Francis Brako
- Department of Mechanical Engineering, University College London (UCL), London, UK
| | - Fatma Koc
- Department of Medical Microbiology, Medipol University, Istanbul, Turkey
| | - Gunes Ozen
- Department of Molecular Medicine, Istanbul University, Istanbul, Turkey
| | | | | | - C J Luo
- Department of Mechanical Engineering, University College London (UCL), London, UK
| | - Oguzhan Gunduz
- Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
| | - Mohan Edirisinghe
- Department of Mechanical Engineering, University College London (UCL), London, UK
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Aydogdu MO, Chou J, Altun E, Ekren N, Cakmak S, Eroglu M, Osman AA, Kutlu O, Oner ET, Avsar G, Oktar FN, Yilmaz I, Gunduz O. Production of the biomimetic small diameter blood vessels for cardiovascular tissue engineering. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2018.1443930] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Mehmet Onur Aydogdu
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Master of Science, Institute of Pure and Applied Sciences, Marmara University, Istanbul, Turkey
| | - Joshua Chou
- Advanced Tissue Regeneration and Drug Delivery Group, School of Medical and Molecular Sciences, University of Technology Sydney, Sydney, NSW, Australia
| | - Esra Altun
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Master of Science, Institute of Pure and Applied Sciences, Marmara University, Istanbul, Turkey
| | - Nazmi Ekren
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Electrical and Electronics Engineering, Faculty of Technology, Marmara University, Istanbul, Turkey
| | - Selami Cakmak
- Orthopedics and Traumatology Clinic, Acibadem Kadikoy Hospital, Istanbul, Turkey
| | - Mehmet Eroglu
- Department of Chemical Engineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Asila A. Osman
- Department of Chemical Engineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Ozlem Kutlu
- Nanotechnology Research and Application Center, & (EFSUN) Center of Excellence for Functional Surfaces and Interfaces for Nano Diagnostics, Sabanci University, Istanbul, Turkey
| | - Ebru Toksoy Oner
- Department of Bioengineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Gulben Avsar
- Department of Bioengineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Faik Nuzhet Oktar
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Bioengineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
| | - Ismail Yilmaz
- Pathology Department, Istanbul Sultan Abdulhamid Han Training Hospital, Istanbul, Turkey
| | - Oguzhan Gunduz
- Advanced Nanomaterials Research Laboratory, Department of Metallurgical and Materials Engineering, Marmara University, Istanbul, Turkey
- Department of Metallurgical and Materials Engineering, Master of Science, Institute of Pure and Applied Sciences, Marmara University, Istanbul, Turkey
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Aydogdu MO, Oprea AE, Trusca R, Surdu AV, Ficai A, Holban AM, Iordache F, Paduraru AV, Filip DG, Altun E, Ekren N, Oktar FN, Gunduz O. Production and Characterization of Antimicrobial Electrospun Nanofibers Containing Polyurethane, Zirconium Oxide and Zeolite. BioNanoSci 2017. [DOI: 10.1007/s12668-017-0443-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Bozkurt Y, Sahin A, Sunulu A, Aydogdu MO, Altun E, Oktar FN, Ekren N, Gunduz O. Electrospun Nanocomposite Materials, A Novel Synergy of Polyurethane and Bovine Derived Hydroxyapatite. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1742-6596/829/1/012015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Eren G, Altun E, Pektas Y, Polat Y, Cetingok H, Demir G, Bilgi D, Tekdos Y, Dogan M. To what extent can local anesthetics be reduced for infraclavicular block with ultrasound guidance? Anaesthesist 2014; 63:760-5. [DOI: 10.1007/s00101-014-2361-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 06/26/2014] [Accepted: 07/05/2014] [Indexed: 10/24/2022]
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Bilici A, Uygun K, Altun E, Karci E, Gurbuz Y, Semih Dogan A. Primary peritoneal spindle cell sarcoma presented with massive ascites: a case report. J BUON 2009; 14:721-723. [PMID: 20148470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Soft tissue sarcomas (STSs) are a heterogeneous group of rare neoplasms originating from the embryonic mesoderm and mesenchymal cells. Primary peritoneal sarcomas have been reported as leiomyosarcoma, liposarcoma and carcinosarcoma. However, primary peritoneal spindle cell sarcoma has never been reported in the literature. Herein, we report on a 38-year-old woman with massive ascites diagnosed as primary peritoneal spindle cell sarcoma. Following doxorubicin and ifosfamide chemotherapy, her symptoms improved and ascites regressed. Other primary peritoneal sarcomas rarely cause massive ascites. We suggest that in patients presenting with massive exudative ascites associated with malignancy, primary peritoneal sarcomas should be also considered in the differential diagnosis.
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Affiliation(s)
- A Bilici
- Department of Medical Oncology, Dr. Lutfi Kirdar Kartal Education and Research Hospital, Istanbul, Turkey.
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Abstract
Hydatid disease caused by Echinococcus granulosus often manifests as a slow growing cystic mass; it mainly affects the liver or lung and rarely other parts of the body such as the brain, heart, spleen, peritoneal cavity, or bone. Hydatid cysts of the musculoskeletal system are rare. Since the intramuscular hydatid cyst closely resembles a soft-tissue tumor on clinical examination, the preoperative radiological diagnosis is very important for the identification of the lesion prior to surgery. We describe a rare case of primary intramuscular hydatidosis in a child, together with its clinical presentation and radiological and histological findings. The treatment principles for hydatid cysts are also discussed.
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Affiliation(s)
- B Erol
- Department of Orthopaedic Surgery, The Hospital of the University of Marmara, Istanbul, Turkey.
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Abstract
Diffuse lipoblastomatosis is a rare lipomatous tumor of infancy that derives from fetal-embryonal fat. It usually affects infants and children and presents as a superficial mass that extends from the subcutis to the underlying muscle in the upper or lower extremities. In spite of its benign nature, the tumor may behave in a locally aggressive manner and invade the surrounding tissues. A case of isolated diffuse lipoblastomatosis of a 5-year-old boy in the plantar aspect of his right foot that has not been documented in that area before is described. The clinical and radiological presentation and histologic evaluation of diffuse lipoblastomatosis are discussed, in order to make a differential diagnosis between this rare tumor and other soft tissue tumors. In addition, the treatment principles of the tumor are described. This case demonstrates that diffuse lipoblastomatosis can be difficult to diagnose without histologic evaluation and, once diagnosed, should be treated by adequate surgical excision in order to prevent recurrence.
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Affiliation(s)
- B Kocaoğlu
- Department of Orthopedic Surgery, Marmara University School of Medicine, Istanbul, Turkey.
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Aribal ME, Altun E. Optic neuritis dueto multiple sclerosis. JBR-BTR 2006; 89:114-5. [PMID: 16883749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Affiliation(s)
- M E Aribal
- Department of Radiology, Faculty of Medicine, Marmara University, Istanbul, Turkey
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