1
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Gu L, Huang R, Ni N, Gu P, Fan X. Advances and Prospects in Materials for Craniofacial Bone Reconstruction. ACS Biomater Sci Eng 2023; 9:4462-4496. [PMID: 37470754 DOI: 10.1021/acsbiomaterials.3c00399] [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] [Indexed: 07/21/2023]
Abstract
The craniofacial region is composed of 23 bones, which provide crucial function in keeping the normal position of brain and eyeballs, aesthetics of the craniofacial complex, facial movements, and visual function. Given the complex geometry and architecture, craniofacial bone defects not only affect the normal craniofacial structure but also may result in severe craniofacial dysfunction. Therefore, the exploration of rapid, precise, and effective reconstruction of craniofacial bone defects is urgent. Recently, developments in advanced bone tissue engineering bring new hope for the ideal reconstruction of the craniofacial bone defects. This report, presenting a first-time comprehensive review of recent advances of biomaterials in craniofacial bone tissue engineering, overviews the modification of traditional biomaterials and development of advanced biomaterials applying to craniofacial reconstruction. Challenges and perspectives of biomaterial development in craniofacial fields are discussed in the end.
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Affiliation(s)
- Li Gu
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
- Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai 200011, China
| | - Rui Huang
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
- Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai 200011, China
| | - Ni Ni
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
- Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai 200011, China
| | - Ping Gu
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
- Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai 200011, China
| | - Xianqun Fan
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
- Shanghai Key Laboratory of Orbital Diseases and Ocular Oncology, Shanghai 200011, China
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2
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Liao D, Su X, Wang J, Yu J, Luo H, Tian W, Ye Z, He J. Pushing the envelope: Immune mechanism and application landscape of macrophage-activating lipopeptide-2. Front Immunol 2023; 14:1113715. [PMID: 36761746 PMCID: PMC9902699 DOI: 10.3389/fimmu.2023.1113715] [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: 12/01/2022] [Accepted: 01/10/2023] [Indexed: 01/25/2023] Open
Abstract
Mycoplasma fermentans can cause respiratory diseases, arthritis, genitourinary tract infections, and chronic fatigue syndrome and have been linked to the development of the human immunodeficiency virus. Because mycoplasma lacks a cell wall, its outer membrane lipoproteins are one of the main factors that induce inflammation in the organism and contribute to disease development. Macrophage-activating lipopeptide-2 (MALP-2) modulates the inflammatory response of monocytes/macrophages in a bidirectional fashion, indirectly enhances the cytotoxicity of NK cells, promotes oxidative bursts in neutrophils, upregulates surface markers on lymphocytes, enhances antigen presentation on dendritic cells and induces immune inflammatory responses in sebocytes and mesenchymal cells. MALP-2 is a promising vaccine adjuvant for this application. It also promotes vascular healing and regeneration, accelerates wound and bone healing, suppresses tumors and metastasis, and reduces lung infections and inflammation. MALP-2 has a simple structure, is easy to synthesize, and has promising prospects for clinical application. Therefore, this paper reviews the mechanisms of MALP-2 activation in immune cells, focusing on the application of MALP-2 in animals/humans to provide a basis for the study of pathogenesis in Mycoplasma fermentans and the translation of MALP-2 into clinical applications.
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Affiliation(s)
- Daoyong Liao
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaoling Su
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jingyun Wang
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jianwei Yu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Haodang Luo
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,Institute of Pathogenic Biology, Hengyang Medical School, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, China
| | - Wei Tian
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Zufeng Ye
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jun He
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,*Correspondence: Jun He,
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Yin J, Zhong J, Wang J, Wang Y, Li T, Wang L, Yang Y, Zhen Z, Li Y, Zhang H, Zhong S, Wu Y, Huang W. 3D-printed high-density polyethylene scaffolds with bioactive and antibacterial layer-by-layer modification for auricle reconstruction. Mater Today Bio 2022; 16:100361. [PMID: 35937577 PMCID: PMC9352972 DOI: 10.1016/j.mtbio.2022.100361] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/04/2022] [Accepted: 07/09/2022] [Indexed: 11/25/2022]
Abstract
High-density polyethylene (HDPE) is a promising material for the development of scaffold implants for auricle reconstruction. However, preparing a personalized HDPE auricle implant with favorable bioactive and antibacterial functions to promote skin tissue ingrowth is challenging. Herein, we present 3D-printed HDPE auricle scaffolds with satisfactory pore size and connectivity. The layer-by-layer (LBL) approach was applied to achieve the improved bioactive and antibacterial properties of these 3D printed scaffolds. The HDPE auricle scaffolds were fabricated using an extrusion 3D printing approach, and the individualized macrostructure and porous microstructure were both adjusted by the 3D printing parameters. The polydopamine (pDA) coating method was used to construct a multilayer ε-polylysine (EPL) and fibrin (FIB) modification on the surface of the 3D HDPE scaffold via the LBL self-assembly approach, which provides the bioactive and antibacterial properties. The results of the in vivo experiments using an animal model showed that LBL-coated HDPE auricular scaffolds were able to significantly enhance skin tissue ingrowth and ameliorate the inflammatory response caused by local stress. The results of this study suggest that the combination of the 3D printing technique and surface modification provides a promising strategy for developing personalized implants with biofunctional coatings, which show great potential as a scaffold implant for auricle reconstruction applications. 3D-printed HDPE auricle scaffolds with suitable pore size and connectivity developed. The layer-by-layer (LBL) approach improved bioactive and antibacterial properties. The LBL-coated HDPE auricular scaffolds facilitated skin tissue ingrowth in vitro. The combination of 3D printing and surface modification is a promising strategy.
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Affiliation(s)
- Junfeiyang Yin
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Jing Zhong
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
- Dermatology Hospital, Southern Medical University, Guangzhou, 510091, China
| | - Jiejie Wang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Yilin Wang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Ting Li
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Ling Wang
- Biomaterials Research Center, School of Biomedical Engineering, Southern Medical University, Guangzhou, 510515, China
| | - Yang Yang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Zhifang Zhen
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Guangzhou, 510000, China
| | - Yanbing Li
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Hongwu Zhang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Shizhen Zhong
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
- The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, 030699, China
- Corresponding author. Southern Medical University, Guangzhou, 510515, China.
| | - Yaobin Wu
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
- Corresponding author. Southern Medical University, Guangzhou, 510515, China.
| | - Wenhua Huang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Medical Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Guangzhou, 510000, China
- The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, 030699, China
- Corresponding author. Southern Medical University, Guangzhou, 510515, China.
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Fritz T, Schäfer J, Scheuer C, Stutz J, Histing T, Pohlemann T, Menger MD, Laschke MW, Klein M, Orth M. Macrophage-activating lipoprotein (MALP)-2 impairs the healing of partial tendon injuries in mice. Ann Anat 2021; 239:151818. [PMID: 34391911 DOI: 10.1016/j.aanat.2021.151818] [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: 03/08/2021] [Revised: 07/21/2021] [Accepted: 08/10/2021] [Indexed: 11/26/2022]
Abstract
Tendon injuries are accounted for up to 50% of musculoskeletal injuries and often result in poor outcomes. Inflammation is a major hallmark of tendon regeneration. Therefore, we analyzed in this study whether the topical application of the pro-inflammatory mediator macrophage-activating lipoprotein (MALP)-2 improves the healing of partial tendon injuries. C57BL/6 mice underwent a partial tenotomy of the flexor digitorum longus tendon of the left hind limb, which was treated with a solution containing either 0.5 µg MALP-2 or vehicle (control). Repetitive gait analyses were performed prior to the surgical intervention as well as postoperatively on days 1, 3, 7, 14 and 36. The structural stability of the tendons was biomechanically tested on day 7 and 36. In addition, Western blot analyses were performed on isolated tendons that were treated in vitro with MALP-2 or vehicle. In both groups, partial tenotomy resulted in a pathological gait pattern during the initial postoperative phase. On day 7, the gait pattern normalized in vehicle-treated animals, but not in MALP-2-treated mice. Moreover, the tendons of MALP-2-treated mice exhibited a significantly reduced biomechanical stiffness after 7 and 36 days when compared to controls. Western blot analyses revealed a significantly higher expression of heme oxygenase (HO)-1 and lower expression of cyclin D in MALP-2-treated tendons. These findings indicate that MALP-2 delays the healing of injured tendons most likely due to increased intracellular stress and suppressed cell proliferation in this naturally bradytrophic tissue. Hence, the application of MALP-2 cannot be recommended for the treatment of tendon injuries.
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Affiliation(s)
- Tobias Fritz
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany.
| | - Julia Schäfer
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany
| | - Claudia Scheuer
- Institute for Clinical and Experimental Surgery, Saarland University, 66421 Homburg, Germany
| | - Janine Stutz
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany
| | - Tina Histing
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany; BG Trauma Center, Eberhard Karls Universitaet Tuebingen, Tuebingen, Germany
| | - Tim Pohlemann
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany
| | - Michael D Menger
- Institute for Clinical and Experimental Surgery, Saarland University, 66421 Homburg, Germany
| | - Matthias W Laschke
- Institute for Clinical and Experimental Surgery, Saarland University, 66421 Homburg, Germany
| | - Moritz Klein
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany
| | - Marcel Orth
- Department of Trauma, Hand and Reconstructive Surgery, Saarland University Medical Center, 66421 Homburg, Germany
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Hou J, Yang R, Vuong I, Li F, Kong J, Mao HQ. Biomaterials strategies to balance inflammation and tenogenesis for tendon repair. Acta Biomater 2021; 130:1-16. [PMID: 34082095 DOI: 10.1016/j.actbio.2021.05.043] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 05/15/2021] [Accepted: 05/24/2021] [Indexed: 12/17/2022]
Abstract
Adult tendon tissue demonstrates a limited regenerative capacity, and the natural repair process leaves fibrotic scar tissue with inferior mechanical properties. Surgical treatment is insufficient to provide the mechanical, structural, and biochemical environment necessary to restore functional tissue. While numerous strategies including biodegradable scaffolds, bioactive factor delivery, and cell-based therapies have been investigated, most studies have focused exclusively on either suppressing inflammation or promoting tenogenesis, which includes tenocyte proliferation, ECM production, and tissue formation. New biomaterials-based approaches represent an opportunity to more effectively balance the two processes and improve regenerative outcomes from tendon injuries. Biomaterials applications that have been explored for tendon regeneration include formation of biodegradable scaffolds presenting topographical, mechanical, and/or immunomodulatory cues conducive to tendon repair; delivery of immunomodulatory or tenogenic biomolecules; and delivery of therapeutic cells such as tenocytes and stem cells. In this review, we provide the biological context for the challenges in tendon repair, discuss biomaterials approaches to modulate the immune and regenerative environment during the healing process, and consider the future development of comprehensive biomaterials-based strategies that can better restore the function of injured tendon. STATEMENT OF SIGNIFICANCE: Current strategies for tendon repair focus on suppressing inflammation or enhancing tenogenesis. Evidence indicates that regulated inflammation is beneficial to tendon healing and that excessive tissue remodeling can cause fibrosis. Thus, it is necessary to adopt an approach that balances the benefits of regulated inflammation and tenogenesis. By reviewing potential treatments involving biodegradable scaffolds, biological cues, and therapeutic cells, we contrast how each strategy promotes or suppresses specific repair steps to improve the healing outcome, and highlight the advantages of a comprehensive approach that facilitates the clearance of necrotic tissue and recruitment of cells during the inflammatory stage, followed by ECM synthesis and organization in the proliferative and remodeling stages with the goal of restoring function to the tendon.
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6
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Kharbikar BN, Chendke GS, Desai TA. Modulating the foreign body response of implants for diabetes treatment. Adv Drug Deliv Rev 2021; 174:87-113. [PMID: 33484736 PMCID: PMC8217111 DOI: 10.1016/j.addr.2021.01.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/30/2020] [Accepted: 01/10/2021] [Indexed: 02/06/2023]
Abstract
Diabetes Mellitus is a group of diseases characterized by high blood glucose levels due to patients' inability to produce sufficient insulin. Current interventions often require implants that can detect and correct high blood glucose levels with minimal patient intervention. However, these implantable technologies have not reached their full potential in vivo due to the foreign body response and subsequent development of fibrosis. Therefore, for long-term function of implants, modulating the initial immune response is crucial in preventing the activation and progression of the immune cascade. This review discusses the different molecular mechanisms and cellular interactions involved in the activation and progression of foreign body response (FBR) and fibrosis, specifically for implants used in diabetes. We also highlight the various strategies and techniques that have been used for immunomodulation and prevention of fibrosis. We investigate how these general strategies have been applied to implants used for the treatment of diabetes, offering insights on how these devices can be further modified to circumvent FBR and fibrosis.
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Affiliation(s)
- Bhushan N Kharbikar
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Gauree S Chendke
- University of California Berkeley - University of California San Francisco Graduate Program in Bioengineering, San Francisco, CA 94143, USA
| | - Tejal A Desai
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA 94143, USA; University of California Berkeley - University of California San Francisco Graduate Program in Bioengineering, San Francisco, CA 94143, USA; Department of Bioengineering, University of California, Berkeley, CA 94720, USA.
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7
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Später T, Mariyanats AO, Syachina MA, Mironov AV, Savelyev AG, Sochilina AV, Menger MD, Vishnyakova PA, Kananykhina EY, Fatkhudinov TK, Sukhikh GT, Spitkovsky DD, Katsen-Globa A, Laschke MW, Popov VK. In Vitro and in Vivo Analysis of Adhesive, Anti-Inflammatory, and Proangiogenic Properties of Novel 3D Printed Hyaluronic Acid Glycidyl Methacrylate Hydrogel Scaffolds for Tissue Engineering. ACS Biomater Sci Eng 2020; 6:5744-5757. [PMID: 33320574 DOI: 10.1021/acsbiomaterials.0c00741] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this study, we prepared hydrogel scaffolds for tissue engineering by computer-assisted extrusion three-dimensional (3D) printing with photocured (λ = 445 nm) hyaluronic acid glycidyl methacrylate (HAGM). The developed product was compared with the polylactic-co-glycolic acid (PLGA) scaffolds generated by means of the original antisolvent 3D printing methodology. The cytotoxicity and cytocompatibility of the scaffolds were analyzed in vitro by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide tests, flow cytometry, and scanning electron microscopy. Anti-inflammatory and proangiogenic properties of the scaffolds were evaluated in the dorsal skinfold chamber mouse model by means of intravital fluorescence microscopy, histology, and immunohistochemistry throughout an observation period of 14 days. In vitro, none of the scaffolds revealed cytotoxicity on days 1, 2, and 5 after seeding with umbilical cord-derived multipotent stromal cells, and the primary cell adhesion to the surface of HAGM scaffolds was low. In vivo, implanted HAGM scaffolds showed enhanced vascularization and host tissue ingrowth, and the inflammatory response to them was less pronounced compared with PLGA scaffolds. The results indicate excellent biocompatibility and vascularization capacity of the developed 3D printed HAGM scaffolds and position them as strong candidates for advanced tissue engineering applications.
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Affiliation(s)
- Thomas Später
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Aleksandra O Mariyanats
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia
| | - Maria A Syachina
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia
| | - Anton V Mironov
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia
| | - Alexander G Savelyev
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia.,Sechenov First Moscow State Medical University, 119991 Moscow, Russia
| | - Anastasia V Sochilina
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, 117997 Moscow, Russia
| | - Michael D Menger
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Polina A Vishnyakova
- Kulakov Scientific Center for Obstetrics, Gynecology and Perinatology of Ministry of Health of the Russian Federation, 117198 Moscow, Russia
| | | | | | - Gennady T Sukhikh
- Kulakov Scientific Center for Obstetrics, Gynecology and Perinatology of Ministry of Health of the Russian Federation, 117198 Moscow, Russia
| | - Dmitry D Spitkovsky
- Kulakov Scientific Center for Obstetrics, Gynecology and Perinatology of Ministry of Health of the Russian Federation, 117198 Moscow, Russia
| | - Alisa Katsen-Globa
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Matthias W Laschke
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Vladimir K Popov
- Institute of Photon Technologies of Federal Scientific Research Centre "Crystallography and Photonics" of Russian Academy of Sciences, 108840 Moscow, Russia
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Später T, Menger MD, Laschke MW. Vascularization Strategies for Porous Polyethylene Implants. TISSUE ENGINEERING PART B-REVIEWS 2020; 27:29-38. [PMID: 32524897 DOI: 10.1089/ten.teb.2020.0077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Porous polyethylene (pPE) is a frequently implanted biomaterial in craniofacial reconstructive surgery. Its rapid vascularization and tissue incorporation are major prerequisites to prevent complications, such as material infection, migration, and extrusion. To achieve this, several sophisticated strategies have been introduced and evaluated during the last 20 years. These include (i) the angiogenic stimulation of the host tissue with epidermal growth factor, basic fibroblast growth factor or macrophage-activating lipopeptide-2, (ii) material modifications, such as increase of surface roughness and incorporation of bioactive glass particles, (iii) surface coatings with growth factors, glycoproteins, acrylic acid, arginine/glycine/aspartic acid peptide as well as components of the plasminogen activation system and autologous clotted blood or serum, and (iv) the seeding with fibroblasts, chondrocytes, stem cells, or adipose-tissue-derived microvascular fragments. The majority of these approaches showed promising results in experimental studies and, thus, may be capable of improving the success rates after pPE implantation in future clinical practice.
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Affiliation(s)
- Thomas Später
- Institute for Clinical & Experimental Surgery, Saarland University, Homburg, Germany
| | - Michael D Menger
- Institute for Clinical & Experimental Surgery, Saarland University, Homburg, Germany
| | - Matthias W Laschke
- Institute for Clinical & Experimental Surgery, Saarland University, Homburg, Germany
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9
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Coste A, Oktay MH, Condeelis JS, Entenberg D. Intravital Imaging Techniques for Biomedical and Clinical Research. Cytometry A 2020; 97:448-457. [PMID: 31889408 PMCID: PMC7210060 DOI: 10.1002/cyto.a.23963] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 10/10/2019] [Accepted: 12/18/2019] [Indexed: 12/22/2022]
Abstract
Intravital imaging, the direct visualization of cells and tissues within a living animal, is a technique that has been employed for the better part of a century. The advent of confocal and multiphoton microscopy has dramatically improved the power of intravital imaging, making it possible to obtain optical sections of tissues non-destructively. This review discusses the various techniques used for intravital imaging, describes how intravital imaging provides information about cellular and tissue dynamics not possible to be garnered by other techniques, and details several ways in which intravital imaging is making a direct impact on the clinical care of patients. © 2019 International Society for Advancement of Cytometry.
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Affiliation(s)
- Anouchka Coste
- Department of Surgery, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Department of Anatomy and Structural Biology, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Gruss-Lipper Biophotonics Center, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
| | - Maja H. Oktay
- Department of Anatomy and Structural Biology, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Gruss-Lipper Biophotonics Center, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Integrated Imaging Program, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Department of Pathology, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
| | - John S. Condeelis
- Department of Surgery, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Department of Anatomy and Structural Biology, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Gruss-Lipper Biophotonics Center, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Integrated Imaging Program, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
| | - David Entenberg
- Department of Anatomy and Structural Biology, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Gruss-Lipper Biophotonics Center, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
- Integrated Imaging Program, Einstein College of Medicine/Montefiore Medical Center, Bronx, New York
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10
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Laschke MW, Heß A, Scheuer C, Karschnia P, Kontaxi E, Menger MD. University of Wisconsin solution for the xeno-free storage of adipose tissue-derived microvascular fragments. Regen Med 2019; 14:681-691. [DOI: 10.2217/rme-2018-0164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Aim: Adipose tissue-derived microvascular fragments (ad-MVF) are vascularization units for regenerative medicine. We investigated whether University of Wisconsin (UW) solution is suitable for their xeno-free storage. Materials & methods: Murine ad-MVF were cultivated for 24 h in 4°C or 20°C UW solution and 20°C endothelial cell growth medium (control). The ad-MVF were seeded onto collagen–glycosaminoglycan scaffolds, which were analyzed in dorsal skinfold chambers by intravital fluorescence microscopy and histology. Results: All implants exhibited microvascular networks on day 14 with the highest functional microvessel density in controls. Ad-MVF cultivation in UW solution at 4°C resulted in an improved scaffold vascularization compared with cultivation at 20°C. Conclusion: UW solution is suitable for the hypothermic storage of ad-MVF.
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Affiliation(s)
- Matthias W Laschke
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Alexander Heß
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Claudia Scheuer
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Philipp Karschnia
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Elena Kontaxi
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
| | - Michael D Menger
- Institute for Clinical & Experimental Surgery, Saarland University, 66421 Homburg/Saar, Germany
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Vollkommer T, Henningsen A, Friedrich RE, Felthaus OH, Eder F, Morsczeck C, Smeets R, Gehmert S, Gosau M. Extent of Inflammation and Foreign Body Reaction to Porous Polyethylene In Vitro and In Vivo. In Vivo 2019; 33:337-347. [PMID: 30804110 DOI: 10.21873/invivo.11479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM High-density porous polyethylene (PP) offers possibilities for reconstruction in craniofacial surgery. The purpose of this study was to evaluate the extent of inflammation and foreign body reactions to PP in vitro and in vivo. MATERIALS AND METHODS Cell attachment, proliferation and expression of inflammatory cytokines were assessed using murine macrophages (RAW 264.7) on two different PP materials in vitro. In vivo, Balb/c mice received PP implants at their dorsum. After sacrifice, samples were analyzed histologically and real-time PCR was used to assess expression of inflammatory cytokines. RESULTS Cells showed a significantly decreased proliferation (p<0.001) after 48 h and a significantly increased expression of TNF-α (p<0.05) at 24, 48 and 72 h. All animals showed foreign body cell reactions and signs of chronic inflammation. Expression of all but one of the investigated cytokines dropped to non-significant levels after an initial increase. CONCLUSION Application of porous polyethylene can cause local chronic inflammatory reactions. Although clinical application seems to be immunologically safe, indication and risks should be evaluated carefully when using PP implants.
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Affiliation(s)
- Tobias Vollkommer
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Anders Henningsen
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany .,Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Oral and Maxillofacial Surgery, German Armed Forces Hospital, Hamburg, Germany
| | - Reinhard E Friedrich
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Oliver Heinrich Felthaus
- Department of Plastic, Hand and Restoration Surgery, Caritas Hospital St. Josef, Regensburg, Germany
| | | | - Christian Morsczeck
- Department of Oral and Maxillofacial Surgery, University Medical Center-Regensburg, Regensburg, Germany
| | - Ralf Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Department of Oral and Maxillofacial Surgery, Division of Regenerative Orofacial Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sebastian Gehmert
- Department of Orthopaedics, University Children's Hospital Basel, Basel, Switzerland
| | - Martin Gosau
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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12
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Griffin M, Kalaskar D, Butler P. Argon plasma modified nanocomposite polyurethane scaffolds provide an alternative strategy for cartilage tissue engineering. J Nanobiotechnology 2019; 17:51. [PMID: 30954085 PMCID: PMC6451776 DOI: 10.1186/s12951-019-0477-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/13/2019] [Indexed: 02/01/2023] Open
Abstract
Background Children born with a small or absent ear undergo surgical reconstruction to create a suitable replacement using rib cartilage. To overcome the donor site morbidity and long-term pain of harvesting rib cartilage, synthetic materials can be a useful alternative. Medpor, is the currently used synthetic polyethylene material to replace missing facial cartilage but unfortunately it has high levels of surgical complications including infection and extrusion, making it an unsuitable replacement. New materials for facial cartilage reconstruction are required to improve the outcomes of surgical reconstruction. This study has developed a new nanomaterial with argon surface modification for auricular cartilage replacement to overcome the complications with Medpor. Results Polyurethanes nanocomposites scaffolds (PU) were modified with argon plasma surface modification (Ar) and compared to Medpor in vitro and in vivo. Ar scaffolds allowed for greater protein adsorption than Medpor and PU after 48 h (p < 0.05). Cell viability and DNA assays demonstrated over 14-days greater human dermal fibroblast adhesion and cell growth on Ar than PU and Medpor nanocomposites scaffolds (p < 0.05). Gene expression using RT-qPCR of collagen-I, fibronectin, elastin, and laminin was upregulated on Ar scaffolds compared to Medpor and PU after 14-days (p < 0.05). Medpor, unmodified polyurethane and plasma modified polyurethane scaffolds were subcutaneously implanted in the dorsum of mice for 12 weeks to assess tissue integration and angiogenesis. Subcutaneous implantation of Ar scaffolds in mice dorsum, demonstrated significantly greater tissue integration by H&E and Massons trichrome staining, as well as angiogenesis by CD31 vessel immunohistochemistry staining over 12-weeks (p < 0.05). Conclusions Argon modified polyurethane nanocomposite scaffolds support cell attachment and growth, tissue integration and angiogenesis and are a promising alternative for facial cartilage replacement. This study demonstrates polyurethane nanocomposite scaffolds with argon surface modification are a promising biomaterial for cartilage tissue engineering applications. Electronic supplementary material The online version of this article (10.1186/s12951-019-0477-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Michelle Griffin
- Division of Surgery & Interventional Science, University College London (UCL), London, UK. .,Plastic and Reconstructive Surgery Department, NHS Foundation Trust Hospital, Royal Free London, Pond Street, London, UK. .,The Charles Wolfson Center for Reconstructive Surgery, Royal Free Hospital, London, UK.
| | - Deepak Kalaskar
- Division of Surgery & Interventional Science, University College London (UCL), London, UK.,UCL Institute of Orthopaedics and Musculoskeletal Science, Division of Surgery and Interventional Science, University College London, Stanmore, Middlesex, HA7 4LP, UK
| | - Peter Butler
- Division of Surgery & Interventional Science, University College London (UCL), London, UK.,Plastic and Reconstructive Surgery Department, NHS Foundation Trust Hospital, Royal Free London, Pond Street, London, UK.,The Charles Wolfson Center for Reconstructive Surgery, Royal Free Hospital, London, UK
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13
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Biomaterials: Foreign Bodies or Tuners for the Immune Response? Int J Mol Sci 2019; 20:ijms20030636. [PMID: 30717232 PMCID: PMC6386828 DOI: 10.3390/ijms20030636] [Citation(s) in RCA: 321] [Impact Index Per Article: 64.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 01/22/2019] [Accepted: 01/28/2019] [Indexed: 12/11/2022] Open
Abstract
The perspectives of regenerative medicine are still severely hampered by the host response to biomaterial implantation, despite the robustness of technologies that hold the promise to recover the functionality of damaged organs and tissues. In this scenario, the cellular and molecular events that decide on implant success and tissue regeneration are played at the interface between the foreign body and the host inflammation, determined by innate and adaptive immune responses. To avoid adverse events, rather than the use of inert scaffolds, current state of the art points to the use of immunomodulatory biomaterials and their knowledge-based use to reduce neutrophil activation, and optimize M1 to M2 macrophage polarization, Th1 to Th2 lymphocyte switch, and Treg induction. Despite the fact that the field is still evolving and much remains to be accomplished, recent research breakthroughs have provided a broader insight on the correct choice of biomaterial physicochemical modifications to tune the reaction of the host immune system to implanted biomaterial and to favor integration and healing.
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14
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Hessenauer MET, Lauber K, Zuchtriegel G, Uhl B, Hussain T, Canis M, Strieth S, Berghaus A, Reichel CA. Vitronectin promotes the vascularization of porous polyethylene biomaterials. Acta Biomater 2018; 82:24-33. [PMID: 30296618 DOI: 10.1016/j.actbio.2018.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 09/29/2018] [Accepted: 10/04/2018] [Indexed: 01/22/2023]
Abstract
Rapid implant vascularization is a prerequisite for successful biomaterial engraftment. Vitronectin (VN) is a matricellular glycoprotein well known for its capability to interact with growth factors, proteases, and protease inhibitors/receptors. Since such proteins are highly relevant for angiogenic processes, we hypothesized that VN contributes to the tissue integration of biomaterials. Employing different in vivo and ex vivo microscopy techniques, engraftment of porous polyethylene (PPE) implants was analyzed in the dorsal skinfold chamber model in wild-type (WT) and VN-/- mice. Upon PPE implantation, vascularization of this biomaterial was severely compromised in animals lacking this matricellular protein. Proteome profiling revealed that VN deficiency does not cause major changes in angiogenic protein composition in the implants suggesting that VN promotes PPE vascularization via mechanisms modulating the activity of angiogenic factors rather than by directly enriching them in the implant. Consequently, surface coating with recombinant VN (embedded in Matrigel®) accelerated implant vascularization in WT mice by enhancing the maturation of a vascular network. Thus, VN contributes to the engraftment of PPE implants by promoting the vascularization of this biomaterial. Surface coating with VN might provide a promising strategy to improve the vascularization of PPE implants without affecting the host's integrity. STATEMENT OF SIGNIFICANCE: Porous polyethylene (PPE) is a biomaterial frequently used in reconstructive surgery. The proper vascularization of PPE implants is a fundamental prerequisite for its successful engraftment in host tissue. Although the overall biocompatibility of PPE is good, there are less favorable application sites for its use in tissue reconstruction mostly characterized by low blood supply. Employing advanced in vivo microscopy methods and proteomic analyses in genetically engineered mice, we here describe a previously unrecognized function of vitronectin (VN) that enables this abundantly present glycoprotein to particularly promote the vascularization of PPE biomaterial. These properties of VN specifically facilitate the formation of a dense vessel network within the implant which relies on modulating the activity of angiogenic mediators rather than on the enrichment of these factors in the implant. Consequently, surface coating with this matricellular protein effectively accelerated and intensified implant vascularization which might be beneficial for its implementation at unfavorable sites for implantation without affecting the host's integrity.
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Affiliation(s)
- Maximilian E T Hessenauer
- Department of Plastic and Reconstructive Surgery, Friedrich-Alexander-Universität Erlangen, Erlangen, Germany; Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany; Walter Brendel Centre of Experimental Medicine, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Kirsten Lauber
- Department of Radiotherapy and Radiation Oncology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Gabriele Zuchtriegel
- Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany; Walter Brendel Centre of Experimental Medicine, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Bernd Uhl
- Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany; Walter Brendel Centre of Experimental Medicine, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Timon Hussain
- Walter Brendel Centre of Experimental Medicine, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany; Department of Otorhinolaryngology, University of Essen, Essen, Germany
| | - Martin Canis
- Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Sebastian Strieth
- Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center of Mainz, Mainz, Germany
| | - Alexander Berghaus
- Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Christoph A Reichel
- Department of Otorhinolaryngology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany; Walter Brendel Centre of Experimental Medicine, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany.
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15
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Gu B, Papadimitrakopoulos F, Burgess DJ. PLGA microsphere/PVA hydrogel coatings suppress the foreign body reaction for 6 months. J Control Release 2018; 289:35-43. [PMID: 30261203 DOI: 10.1016/j.jconrel.2018.09.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Revised: 09/17/2018] [Accepted: 09/22/2018] [Indexed: 01/18/2023]
Abstract
The application of dexamethasone releasing poly (lactic-co-glycolic acid) (PLGA) microspheres embedded in a poly vinyl alcohol (PVA) hydrogel coatings have been successfully used in the suppression of the foreign body response (FBR) to implantable glucose sensors. In the current study, dexamethasone-loaded PLGA microspheres were prepared by blending two types of PLGA polymers (RG503H and DLG7E with MW of ca. 25 kDa and 113 kDa, respectively) to achieve long-term (6 months) inhibition of the FBR. The microsphere composition was optimized according to the in vitro drug release profiles. Microspheres with DLG7E/RG503H/dexamethasone = 70/13.3/16.7 wt% composition, when embedded in a PVA hydrogel, provided a continuous drug release for 6 months. By combining the aforementioned microspheres with microspheres composed solely of the DLG7E polymer within a similar PVA hydrogel realized an even longer (>7 months) in vitro drug release. A heat map was constructed to depict the daily in vitro drug released and elucidate possible lag phases that could affect the pharmacodynamic response. These drug-loaded implant coatings were investigated in vivo (rat model) and showed inhibition of the foreign body response for 6 months. These results suggest that the minimum effective daily dose to counter chronic inflammation is ca. 0.1 μg per mg of coating surrounding a 0.5 × 0.5 × 5 mm silicon implant (dummy sensor). Accordingly, these drug-eluting composite coatings can ensure long-term inflammation control for miniaturized implantable devices.
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Affiliation(s)
- Bing Gu
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA
| | | | - Diane J Burgess
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA.
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16
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Schreiter J, Meyer S, Schmidt C, Schulz RM, Langer S. Dorsal skinfold chamber models in mice. GMS INTERDISCIPLINARY PLASTIC AND RECONSTRUCTIVE SURGERY DGPW 2017; 6:Doc10. [PMID: 28706772 PMCID: PMC5506728 DOI: 10.3205/iprs000112] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 12/06/2016] [Indexed: 01/07/2023]
Abstract
Background/purpose: The use of dorsal skinfold chamber models has substantially improved the understanding of micro-vascularisation in pathophysiology over the last eight decades. It allows in vivo pathophysiological studies of vascularisation over a continuous period of time. The dorsal skinfold chamber is an attractive technique for monitoring the vascularisation of autologous or allogenic transplants, wound healing, tumorigenesis and compatibility of biomaterial implants. To further reduce the animals’ discomfort while carrying the dorsal skinfold chamber, we developed a smaller chamber (the Leipzig Dorsal Skinfold Chamber) and summarized the commercial available chamber models. In addition we compared our model to the common chamber. Methods: The Leipzig Dorsal Skinfold Chamber was applied to 66 C57Bl/6 female mice with a mean weight of 22 g. Angiogenesis within the dorsal skinfold chamber was evaluated after injection of fluorescein isothiocyanate dextran with an Axio Scope microscope. The mean vessel density within the dorsal skinfold chamber was assessed over a period of 21 days at five different time points. The gained data were compared to previous results using a bigger and heavier dorsal skinfold model in mice. A PubMed and a patent search were performed and all papers related to “dorsal skinfold chamber” from 1st of January 2006 to 31st of December 2015 were evaluated regarding the dorsal skinfold chamber models and their technical improvements. The main models are described and compared to our titanium Leipzig Dorsal Skinfold Chamber model. Results: The Leipzig Dorsal Skinfold Chamber fulfils all requirements of continuous in vivo models known from previous chamber models while reducing irritation to the mice. Five different chamber models have been identified showing substantial regional diversity. The newly elaborated titanium dorsal skinfold chamber may replace the pre-existing titanium chamber model used in Germany so far, as it is smaller and lighter than the former ones. However, the new chamber does not reach the advantages of already existing chamber models used in Asia and the US, which are smaller and lighter. Conclusion: Elaborating a smaller and lighter dorsal skinfold chamber allows research studies on smaller animals and reduces the animals’ discomfort while carrying the chamber. Greater research exchange should be done to spread the use of smaller and lighter chamber models.
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Affiliation(s)
- Jeannine Schreiter
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
| | - Sophia Meyer
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
| | - Christian Schmidt
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany.,Centre for Biotechnology and Biomedicine, Leipzig, Germany
| | - Ronny M Schulz
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany.,Centre for Biotechnology and Biomedicine, Leipzig, Germany
| | - Stefan Langer
- Department of Plastic, Aesthetic and Special Hand Surgery, Clinic and Polyclinic for Orthopaedics, Traumatology and Plastic Surgery, University Hospital Leipzig, Germany
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17
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Perigraft vascularization and incorporation of implanted Dacron prostheses are affected by rifampicin coating. J Vasc Surg 2016; 64:1815-1824. [DOI: 10.1016/j.jvs.2015.07.104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 07/12/2015] [Indexed: 11/23/2022]
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18
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Gu B, Wang Y, Burgess DJ. In vitro and in vivo performance of dexamethasone loaded PLGA microspheres prepared using polymer blends. Int J Pharm 2015; 496:534-40. [PMID: 26520407 DOI: 10.1016/j.ijpharm.2015.10.056] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/21/2015] [Accepted: 10/22/2015] [Indexed: 11/27/2022]
Abstract
The foreign body reaction is the major cause of the dysfunction and relatively short lifetime associated with implanted glucose biosensors. An effective strategy to maintain sensor functionality is to apply biocompatible coatings that elute drug to counter the negative tissue reactions. This has been achieved using dexamethasone releasing poly(lactic-co-glycolic acid) (PLGA) microspheres embedded in a polyvinyl alcohol (PVA) hydrogel coating. Accordingly, the biosensor lifetime relies on the duration and dose of drug release from the coating. To achieve long-term drug release mixed populations of microspheres have been used. In the current study, microspheres were prepared by blending low (25KDa) and high (113KDa) molecular weight PLGA at different mass ratios to overcome problems associated with mixing multiple populations of microspheres. "Real-time" in vitro studies demonstrated dexamethasone release for approximately 5 months. An accelerated method with discriminatory ability was developed to shorten drug release to less than 2 weeks. An in vivo pharmacodynamics study demonstrated efficacy against the foreign body reaction for 4.5 months. Such composite coatings composed of PLGA microspheres prepared using polymer blends could potentially be used to ensure long-term performance of glucose sensors.
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Affiliation(s)
- Bing Gu
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA
| | - Yan Wang
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA
| | - Diane J Burgess
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA.
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Laschke MW, Augustin VA, Sahin F, Anschütz D, Metzger W, Scheuer C, Bischoff M, Aktas C, Menger MD. Surface modification by plasma etching impairs early vascularization and tissue incorporation of porous polyethylene (Medpor®) implants. J Biomed Mater Res B Appl Biomater 2015; 104:1738-1748. [DOI: 10.1002/jbm.b.33528] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 07/23/2015] [Accepted: 08/30/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Matthias W. Laschke
- Institute for Clinical & Experimental Surgery; Saarland University; 66421 Homburg/Saar Germany
| | - Victor A. Augustin
- Institute for Clinical & Experimental Surgery; Saarland University; 66421 Homburg/Saar Germany
| | - Fadime Sahin
- INM-Leibniz Institute for New Materials; 66123 Saarbrücken Germany
| | - Dieter Anschütz
- INM-Leibniz Institute for New Materials; 66123 Saarbrücken Germany
| | - Wolfgang Metzger
- Department of Trauma, Hand, and Reconstructive Surgery; Saarland University; 66421 Homburg/Saar Germany
| | - Claudia Scheuer
- Institute for Clinical & Experimental Surgery; Saarland University; 66421 Homburg/Saar Germany
| | - Markus Bischoff
- Institute of Medical Microbiology and Hygiene; Saarland University; 66421 Homburg/Saar Germany
| | - Cenk Aktas
- INM-Leibniz Institute for New Materials; 66123 Saarbrücken Germany
| | - Michael D. Menger
- Institute for Clinical & Experimental Surgery; Saarland University; 66421 Homburg/Saar Germany
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20
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Innate Immunity and Biomaterials at the Nexus: Friends or Foes. BIOMED RESEARCH INTERNATIONAL 2015; 2015:342304. [PMID: 26247017 PMCID: PMC4515263 DOI: 10.1155/2015/342304] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 06/15/2015] [Accepted: 06/22/2015] [Indexed: 01/04/2023]
Abstract
Biomaterial implants are an established part of medical practice, encompassing a broad range of devices that widely differ in function and structural composition. However, one common property amongst biomaterials is the induction of the foreign body response: an acute sterile inflammatory reaction which overlaps with tissue vascularisation and remodelling and ultimately fibrotic encapsulation of the biomaterial to prevent further interaction with host tissue. Severity and clinical manifestation of the biomaterial-induced foreign body response are different for each biomaterial, with cases of incompatibility often associated with loss of function. However, unravelling the mechanisms that progress to the formation of the fibrotic capsule highlights the tightly intertwined nature of immunological responses to a seemingly noncanonical “antigen.” In this review, we detail the pathways associated with the foreign body response and describe possible mechanisms of immune involvement that can be targeted. We also discuss methods of modulating the immune response by altering the physiochemical surface properties of the biomaterial prior to implantation. Developments in these areas are reliant on reproducible and effective animal models and may allow a “combined” immunomodulatory approach of adapting surface properties of biomaterials, as well as treating key immune pathways to ultimately reduce the negative consequences of biomaterial implantation.
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