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Guided Tissue Regeneration

M A Gharaei, Y Xue, K Mustafa, S A Lie, I Fristad
BACKGROUND: Angiogenesis is of utmost importance for tissue regeneration and repair. Human dental pulp stromal cells (hDPSCs) possess angiogenic potential, as they secrete paracrine factors that may alter the host microenvironment. However, more insight into how hDPSCs guide endothelial cells (ECs) in a paracrine fashion is yet to be obtained. Therefore, the current study aimed to investigate the effect(s) of conditioned medium derived from hDPSCs (hDPSC-CM) on EC behavior in vitro. METHODS: hDPSCs were harvested from third molars scheduled for surgical removal under informed consent...
March 21, 2018: Stem Cell Research & Therapy
Xiaowei Wu, Shang Zheng, Yuanzhou Ye, Yuchen Wu, Kaili Lin, Jiansheng Su
The reconstruction of bone defects by guiding autologous bone tissue regeneration with artificial biomaterials is a potential strategy in the area of bone tissue engineering. The development of new polymers with good biocompatibility, favorable mechanical properties, and osteoinductivity is of vital importance. Graphene and its derivatives have attracted extensive interests due to the exceptional physiochemical and biological properties of graphene. In this study, poly(lactic-co-glycolic acid) (PLGA) films incorporated by graphene nanoplates were fabricated...
March 21, 2018: Biomaterials Science
Brian B Silver, Celeste M Nelson
Cancer is a complex, heterogeneous group of diseases that can develop through many routes. Broad treatments such as chemotherapy destroy healthy cells in addition to cancerous ones, but more refined strategies that target specific pathways are usually only effective for a limited number of cancer types. This is largely due to the multitude of physiological variables that differ between cells and their surroundings. It is therefore important to understand how nature coordinates these variables into concerted regulation of growth at the tissue scale...
2018: Frontiers in Cell and Developmental Biology
Michael Karsy, Cheryl A Palmer, Mark A Mahan
BACKGROUND: Laminins are extracellular matrix proteins that participate in endoneurial tubule formation and are important in the regeneration of nerves after injury. They act as scaffolds to guide nerves to distal targets and play a key role in neurite outgrowth. Because there is evidence that laminin architecture affects nerve regeneration, we evaluated endoneurial tubules by examining the laminin structure in clinical samples from patients with nerve injuries. METHODS: In a retrospective review of eight nerve injury cases, we evaluated nerve histology in relation to clinical history and injury type...
January 18, 2018: Curēus
Ximena Corso-Díaz, Catherine Jaeger, Vijender Chaitankar, Anand Swaroop
Complex biological processes, such as organogenesis and homeostasis, are stringently regulated by genetic programs that are fine-tuned by epigenetic factors to establish cell fates and/or to respond to the microenvironment. Gene regulatory networks that guide cell differentiation and function are modulated and stabilized by modifications to DNA, RNA and proteins. In this review, we focus on two key epigenetic changes - DNA methylation and histone modifications - and discuss their contribution to retinal development, aging and disease, especially in the context of age-related macular degeneration (AMD) and diabetic retinopathy...
March 12, 2018: Progress in Retinal and Eye Research
Kristina Glenske, Phil Donkiewicz, Alexander Köwitsch, Nada Milosevic-Oljaca, Patrick Rider, Sven Rofall, Jörg Franke, Ole Jung, Ralf Smeets, Reinhard Schnettler, Sabine Wenisch, Mike Barbeck
The regeneration of bone tissue is the main purpose of most therapies in dental medicine. For bone regeneration, calcium phosphate (CaP)-based substitute materials based on natural (allo- and xenografts) and synthetic origins (alloplastic materials) are applied for guiding the regeneration processes. The optimal bone substitute has to act as a substrate for bone ingrowth into a defect, as well as resorb in the time frame needed for complete regeneration up to the condition of restitution ad integrum . In this context, the modes of action of CaP-based substitute materials have been frequently investigated, where it has been shown that such materials strongly influence regenerative processes such as osteoblast growth or differentiation and also osteoclastic resorption due to different physicochemical properties of the materials...
March 12, 2018: International Journal of Molecular Sciences
F Andrea Sass, Michael Fuchs, Matthias Pumberger, Sven Geissler, Georg N Duda, Carsten Perka, Katharina Schmidt-Bleek
Soft tissue trauma of skeletal muscle is one of the most common side effects in surgery. Muscle injuries are not only caused by accident-related injuries but can also be of an iatrogenic nature as they occur during surgical interventions when the anatomical region of interest is exposed. If the extent of trauma surpasses the intrinsic regenerative capacities, signs of fatty degeneration and formation of fibrotic scar tissue can occur, and, consequentially, muscle function deteriorates or is diminished. Despite research efforts to investigate the physiological healing cascade following trauma, our understanding of the early onset of healing and how it potentially determines success or failure is still only fragmentary...
March 13, 2018: International Journal of Molecular Sciences
Lobat Tayebi, Morteza Rasoulianboroujeni, Keyvan Moharamzadeh, Thafar K D Almela, Zhanfeng Cui, Hua Ye
Three-dimensional (3D) printing is currently being intensely studied for a diverse set of applications, including the development of bioengineered tissues, as well as the production of functional biomedical materials and devices for dental and orthopedic applications. The aim of this study was to develop and characterize a 3D-printed hybrid construct that can be potentially suitable for guided tissue regeneration (GTR). For this purpose, the rheology analyses have been performed on different bioinks and a specific solution comprising 8% gelatin, 2% elastin and 0...
March 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Lucas Hidalgo Pitaluga, Marina Trevelin Souza, Edgar Dutra Zanotto, Martin Eduardo Santocildes Romero, Paul V Hatton
Barrier membranes that are used for guided tissue regeneration (GTR) therapy usually lack bioactivity and the capability to promote new bone tissue formation. However, the incorporation of an osteogenic agent into polymeric membranes seems to be the most assertive strategy to enhance their regenerative potential. Here, the manufacturing of composite electrospun membranes made of poly (ε-caprolactone) (PCL) and particles of a novel bioactive glass composition (F18) is described. The membranes were mechanically and biologically tested with tensile strength tests and tissue culture with MG-63 osteoblast-like cell line, respectively...
March 8, 2018: Materials
Shan Zhang, Baojin Ma, Feng Liu, Jiazhi Duan, Shicai Wang, Jichuan Qiu, Dong Li, Yuanhua Sang, Chao Liu, Duo Liu, Hong Liu
Numerous studies have determined that physical cues, especially the nanotopography of materials, play key roles in directing stem cell differentiation. However, most research on nanoarrays for stem cell fate regulation are based on non-biodegradable materials, such as silicon wafers, TiO2, and poly (methyl methacrylate), which are rarely used as tissue engineering biomaterials. In this study, we prepared biodegradable poly-lactic acid (PLA) nanopillar arrays with different diameters but the same center-to-center distance using a series of anodic aluminum oxide nano-well arrays as templates...
March 8, 2018: Nano Letters
George A Mandelaris, Bradley S DeGroot, Robert Relle, Brian Shah, Iwei Huang, Brian S Vence
Comorbidities that negatively impact orthodontic (malocclusion), periodontal (periodontitis, deficient dentoalveolar bone volume, mucogingival), and prosthetic (structural integrity compromise from caries, attrition, and erosion) conditions can affect the general health of the patient. In addition, emerging data highlights the importance of undiagnosed airway volume deficiencies and sleep-disordered breathing conditions in the adult and pediatric population. Deficiencies in dentoalveolar bone and discrepancies in skeletal relationships can impact the volume of hard- and soft-tissue structures of the periodontium and decrease oral cavity volume...
March 2018: Compendium of Continuing Education in Dentistry
Hongyi Liu, Yu Pu, Yaping Xu, He Xu, Huanhai Liu, Yin Cheng, Weihua Xu, Xiaoping Chen, Jingping Fan
The aim of this study was to investigate whether the transplantation of olfactory-ensheathing cells (OECs) could physiologically repair severely injured recurrent laryngeal nerve (RLN) in dogs. Adult Beagle dogs were surgically introduced with a 10-mm defect in the left RLN and transplanted with a nerve guide (NEUROLAC) containing dog olfactory mucosa-olfactory-ensheathing cells (OM-OECs) in matrigel. The effects of OM-OECs on the morphology, histology, and electrophysiology of the injured RLNs, glottis movement, and voice acoustics were comparatively studied...
February 28, 2018: Molecular and Cellular Biochemistry
Shuangshuang Ren, Yingfang Yao, He Zhang, Ruirui Fan, Yijun Yu, Jie Yang, Rui Zhang, Chao Liu, Weibin Sun, Leiying Miao
The periodontal ligament (PDL) is a specific connective tissue composed of organized and aligned collagenous fibers that fix the tooth root in the alveolar bone. The alignment of PDL fibers and their function have been neglected in the past, as many studies investigated the regeneration of the periodontium, including alveolar bone and cementum regeneration. In this study, we fabricated biodegradable aligned fibers (ε-caprolactone/collagen) by near-field electrospinning (NFE) to control the arrangement of human periodontal ligament stem cells (hPDLSCs), aiming to guide the oriented regeneration of the periodontal ligament...
December 1, 2017: Journal of Biomedical Nanotechnology
Shin Kasuya, Nahoko Kato-Kogoe, Michi Omori, Kayoko Yamamoto, Shogo Taguchi, Hiroshi Fujita, Naoko Imagawa, Akihiro Sunano, Kazuya Inoue, Yuichi Ito, Azumi Hirata, Takaaki Ueno, Peter K Moy
PURPOSE: We carried out guided bone regeneration of cranial bone defects in rats using the bovine bone substitute Bio-Oss and a collagen membrane and performed histological observations of the bone repair process. MATERIALS AND METHODS: Bone defects were created in the cranial bones of 30 15-week-old Sprague-Dawley rats. We made 3 groups. A is unfilled, B is Bio-Oss, and C is Bio-Oss plus a collagen membrane. At 4 or 8 weeks postoperatively, tissue samples were taken...
February 26, 2018: Implant Dentistry
Matteo Chiapasco, Paolo Casentini
The rehabilitation of partially or totally edentulous patients with implant-supported prostheses has become routine, with excellent long-term outcome. A proper implant position is mandatory to achieve good functional and esthetic outcome and may require an adequate amount of alveolar bone and surrounding soft tissue. When this is lacking because of atrophy, sequelae of periodontal disease, traumas or congenital malformations, increased bone volume and/or keratinized mucosa can be obtained by guided bone regeneration, bone-grafting techniques and alveolar bone expansion...
February 25, 2018: Periodontology 2000
Yaobin Wu, Ling Wang, Tianli Hu, Peter X Ma, Baolin Guo
Controlling cellular alignment and elongation has been demonstrated as an important parameter for developing nerve tissue engineering scaffolds. Many approaches have been developed to guide cellular orientation for nerve regeneration such as micropatterning techniques. However, most of materials used for developing micropatterning scaffolds lack of bioactivity and biofunctionability. Here we present a functional conductive micropatterned scaffold based on bioactive conductive biodegradable polyurethane prepared using a micro-molding technique...
February 13, 2018: Journal of Colloid and Interface Science
C R Carvalho, S Wrobel, C Meyer, C Brandenberger, I F Cengiz, R López-Cebral, J Silva-Correia, G Ronchi, R L Reis, C Grothe, J M Oliveira, K Haastert-Talini
Peripheral nerve injuries (PNI) resulting in a gap to be bridged between the transected nerve ends are commonly reconstructed with autologous nerve tissue, but there is a need for valuable alternatives. This experimental work considers the innovative use of the biomaterial Gellan Gum (GG) as a luminal filler for nerve guidance channels made from chitosan with a 5% degree of acetylation. The engineered constructs should remodel the structural support given to regenerating axons by the so-called bands of Büngner...
February 21, 2018: Biomaterials Science
Zelong Chen, Chenggong Yan, Shina Yan, Qin Liu, Meirong Hou, Yikai Xu, Rui Guo
Numerous biodegradable hydrogels for cartilage regeneration have been widely used in the field of tissue engineering. However, to non-invasively monitor hydrogel degradation and efficiently evaluate cartilage restoration in situ is still challenging. Methods: A ultrasmall superparamagnetic iron oxide (USPIO)-labeled cellulose nanocrystal (CNC)/silk fibroin (SF)-blended hydrogel system was developed to monitor hydrogel degradation during cartilage regeneration. The physicochemical characterization and biocompatibility of the hydrogel were evaluated in vitro ...
2018: Theranostics
Fan Liang, Hyuma Leland, Breanna Jedrzejewski, Allyn Auslander, Seija Maniskas, Jordan Swanson, Mark Urata, Jeffrey Hammoudeh, William Magee
Alveolar cleft reconstruction has historically relied on autologous iliac crest bone grafting (ICBG), but donor site morbidity, pain, and prolonged hospitalization have prompted the search for bone graft substitutes. The authors evaluated bone graft substitutes with the highest levels of evidence, and highlight the products that show promise in alveolar cleft repair and in maxillary augmentation. This comprehensive review guides the craniofacial surgeon toward safe and informed utilization of biomaterials in the alveolar cleft...
February 14, 2018: Journal of Craniofacial Surgery
Marissa Gionet-Gonzales, Kent Leach
There is a critical need for strategies that effectively enhance cell viability and post-implantation performance in order to advance cell-based therapies. Spheroids, which are dense cellular aggregates, overcome many current limitations with transplanting individual cells. Compared to individual cells, the aggregation of cells into spheroids results in increased cell viability, together with enhanced proangiogenic, anti-inflammatory, and tissue-forming potential. Furthermore, the transplantation of cells using engineered materials enables localized delivery to the target site while providing an opportunity to guide cell fate in situ, resulting in improved therapeutic outcomes compared to systemic or localized injection...
February 20, 2018: Biomedical Materials
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