Despite significant advances in medical research, plastic surgeons still face a shortage of suitable patient tissues, and soft tissue reconstruction is no exception. In recent years, there has been a rapid boom in the use of acellular dermal matrix (ADM) in reconstructive and aesthetic surgery. ADM is incorporated into the surrounding tissue and gradually replaced by the host's collagen, thus promoting and supporting the healing process and reducing the formation of scar tissue. The main goal of this article is to provide a brief review of the current literature assessing the clinical applications of ADM across a broad spectrum of applications in plastic and reconstructive surgery.
This review briefly outlines the history and possibilities of bone reconstruction using various types of artificial materials, which allow interaction with cells only on the surface of the implant or enable ingrowth of cells inside the material. Information is also provided on the most important properties of bone cells taking part in bone tissue development, and on diseases and regeneration. The most common cell types used for testing cell-material interaction in vitro are listed, and the most commonly used approaches to this testing are also mentioned. A considerable part of this review is dedicated to the physical and chemical properties of the materi al surface, which are decisive for the cell-material interaction, and also to modifications to the surface of the material aimed at integrating it better with the surrounding bone tissue. Special attention is paid to the effects of nanoscale and microscale surface roughness on cell behaviour, to material surface patterning, which allows regionally-selective adhesion and growth of cells, an d also to the surface chemistry. In addition, coating the materials with bioactive layers is examined, particularly those create d by deposition of fullerenes, hybrid metal-fullerene composites, carbon nanotubes, nanocrystalline diamond films, diamond-like carbon, and nanocomposite hydrocarbon plasma polymer films enriched with metals., M. Vandrovcová, L. Bačáková., and Obsahuje bibliografii a bibliografické odkazy
Adheze buněk na umělé materiály konstruované pro potenciální biomedicínské využití je regulována povrchovými fyzikálně-chemickými vlastnostmi těchto materiálů. Ozáření polyethylenu ionty O+ a C+ v této studii vedlo k formování chemických funkčních skupin s obsahem kyslíku na jeho povrchu, konjugovaných dvojných vazeb mezi atomy uhlíku, zvýšení povrchové smáčivosti a zvýšení adsorpce kolagenu IV tj. proteinu zprostředkujícího adhezi buněk. Cévní hladké svalové buňky potkana adherovaly k modifikovanému materiálu ve zvýšeném počtu, větší plochou a syntetizovaly více kontraktilních proteinů α-aktinu a SM-myosinů. Podobně i snížení povrchové drsnosti uhlíkových kompozitních materiálů, které jsou perspektivní pro konstrukci kostních náhrad, vedlo ke zvýšení jejich smáčivosti, adsorpce kolagenu IV a následné adheze, růstu a diferenciace lidských kostních buněk., Lucie Bačáková, Lenka Nosková, Elena Filová, Václav Švorčík, Eva Koutná, Vladimír Starý, Jakub Horník, Petr Glogar., and Obsahuje seznam literatury
Spinal cord injury results in a permanent neurological deficit due to tissue damage. Such a lesion is a barrier for “communication” between the brain and peripheral tissues, effectors as well as receptors. One of the primary goal s of tissue engineering is to bridge the spinal cord injury and re-establish the damaged connections. Hydrogels are biocompatible implants used in spinal cord injury repair. They can create a permissive environment and bridge the lesion cavities by providing a scaffold for the regeneration of neurons and their axons, glia and other tissue elements. The advantage of using artificial materials is the possibility to modify their physical and chemical properties in order to develop the best implant suitable for spinal cord injury repair. As a result, several types of hydrogels have been tested in experimental studies so far. We review our work that has been done during the last 5 years with various types of hydrogels and their applications in experimental spinal cord injury repair., A. Hejčl, P. Lesný, M. Přádný, J. Michálek, P. Jendelová, J. Štulík, E. Syková., and Obsahuje bibliografii a bibliografické odkazy
The present article introduces a novel method of characterizing the macromechanical cartilage properties based on dynamic testing. The proposed approach of instrumented impact testing shows the possibility of more detailed investigation of the acting dynamic forces and corresponding deformations within the wide range of strain rates and loads, including the unloading part of stress-strain curves and hysteresis loops. The presented results of the unconfined compression testing of both the native joint cartilage tissues and potential substitute materials outlined the opportunity to measure the dissipation energy and thus to identify the initial mechanical deterioration symptoms and to introduce a better definition of material damage. Based on the analysis of measured specimen deformation, the intact and pathologically changed cartilage tissue can be distinguished and the differences revealed., F. Varga, M. Držík, M. Handl, J. Chlpík, P. Kos, E. Filová, M. Rampichová, A. Nečas, T. Trč, E. Amler., and Obsahuje bibliografii
The gold standard material in bypass surgery of blood vessels remains the patient’s own artery or vein. However, this material may be unavailable, or may suffer vein graft disease. Currently available vascular prostheses, namely polyethylene terephthalate (PET, Dacron) and expanded poly tetrafluoroethylene (ePTFE), perform well as large-caliber replacements, but their long-term patency is discouraging in small-caliber applications (<6 mm), such as in coronary, crural or microvessel surgery. This failure is mainly a result of an unfavorable healing process with surface thrombogenicity, due to lack of endothelial cells and anastomotic intimal hyperplasia caused by hemodynamic disturbances. An ideal small-diameter vascular graft has become a major focus of research. Novel biomaterials have been manufactured, and tissue-biomaterial interactions have been optimized. Tissue engineering technology has proven that the concept of partially or totally living blood vessels is feasible. The purpose of this review is to outline the vascular graft materials that are currently being implanted, taking into account cell-biomaterial physiology, tissue engineering approaches and the collective achievements of the authors., J. Chlupáč, E. Filová, L. Bačáková., and Obsahuje seznam literatury
Rapid wound closure in extensively burned patients has remained one of the major unresolved issues of medicine. Integra® is the most widely established artificial skin, which is composed of a porous matrix of cross-linked bovine collagen and chondroitin 6-sulphate covered by a semi-permeable silicone layer. We present here a (immuno)histological study of a severely burned patient with a full-thickness burn treated with a tissue-engineered dermal template (Integra®) and split-thickness skin graft-based protocol. Immunohistochemical investigation of the artificial dermis revealed that immune cell infiltration reached its peak on day 10. Tissue immunophenotyping found an increase in CD3+ cells over the course of the study as well as CD4 and CD8 positivity on day 40, indicating remaining T-cell subpopulations. We observed weak/no infiltration of NK cells (CD56+). In conclusion, the use of bi-layer Integra® represents a feasible and safe procedure resulting in formation of non-irritating dermal substitutes.
Non-woven textile mesh from polyglycolic acid (PGA) was found as a proper material for chondrocyte adhesion but worse for their proliferation. Neither hyaluronic acid nor chitosan nor polyvinyl alcohol (PVA) increased chondrocyte adhesion. However, chondrocyte proliferation suffered from acidic byproducts of PGA degradation. However, the addition of PVA and/or chitosan into a wet-laid non-woven textile mesh from PGA improved chondrocyte proliferation seeded in vitro on the PGA-based composite scaffold namely due to a diminished acidification of their microenvironment. This PVA/PGA composite mesh used in combination with a proper hydrogel minimized the negative effect of PGA degradation without dropping positive parameters of the PGA wet-laid non-woven textile mesh. In fact, presence of PVA and/or chitosan in the PGA-based wet-laid non-woven textile mesh even advanced the PGA-based wet-laid non-woven textile mesh for chondrocyte seeding and artificial cartilage production due to a positive effect of PVA in such a scaffold on chondrocyte proliferation., M. Rampichová ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Tissue engineering (TE) and regenerative medicine are progressively developed areas due to many novel tissue replacements and implementation strategies. Increasing knowledge involving the fabrication of biomaterials with advanced physicochemical and biological characteristics, successful isolation and preparation of stem cells, incorporation of growth and differentiation factors, and biomimetic environments gives us a unique opportunity to develop various types of scaffolds for TE. The current strategies for soft tissue reconstitution or regeneration highlight the importance of novel regenerative therapies in cases of significant soft tissue loss and in cases of congenital defects, disease, trauma and ageing. Various types of biomaterials and scaffolds have been tested for soft tissue regeneration. The synthetic types of materials have gained great attention due to high versatility, tunability and easy functionalization for better biocompatibility. This article reviews the current materials that are usually the most used for the fabrication of scaffolds for soft TE; in addition, the types of scaffolds together with examples of their applications for the regenerative purposes of soft tissue, as well as their major physicochemical characteristics regarding the increased applicability of these materials in medicine, are reviewed., O. Janoušková., and Obsahuje bibliografii
This review summarizes recent trends in the construction of bioartificial vascular replacements, i.e. hybrid grafts containing synthetic polymeric scaffolds and cells. In these advanced replacements, vascular smooth muscle cells (VSMC) should be considered as a physiological component, although it is known that activation of the migration and proliferation of VSMC plays an important role in the onset and development of vascular diseases, and also in re stenosis of currently used vascular grafts. Therefore, in novel bioartificial vascular grafts, VSMCs should be kept in quiescent mature contractile phenotype. This can be achieved by (1) appropriate physical and chemical properties of the material, such as its chemical composition, polarity, wettability, surface roughness and topography, electrical charge and conductivity, functionalization with biomolecules and mechanical properties, (2) appropriate cell culture conditions, such as composition of cell culture media and dynamic load, namely cyclic strain, and (3) the presence of a confluent, mature, semipermeable, non-thrombogenic and non-immunogenic endothelial cell (EC) barrier, covering the luminal surface of the graft and separating the VSMCs from the blood. Both VSMCs and ECs can also be differentiated from stem and progenitor cells of various sources. In the case of degradable scaffolds, the material will gradually be removed by the cells and will be replaced by their own new extracellular matrix. Thus, the material component in advanced blood vessel substitute s acts as a temporary scaffold that promotes regeneration of the damaged vascular tissue., M. Pařízek, K. Novotná, L. Bačáková., and Obsahuje bibliografii a bibliografické odkazy