Stephen F Badylak

..The aim of this study was to determine the ability of a xenogeneic ECM scaffold to restore functional skeletal muscle in a canine model of a complex quadriceps injury involving bone, tendon, and muscle...

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..Critical challenges and future directions are also discussed...

..This manuscript provides an overview of studies that have evaluated the immune response to biologic scaffold materials and variables that affect this response...

..This experience provides evidence that a regenerative medicine approach may, for the first time, enable aggressive endoscopic resection of early stage neoplasia without the need for esophagectomy and its associated complications...

..We conclude that ECM bioscaffolds plus autologous muscle tissue, but not ECM scaffolds or muscle tissue alone, can facilitate the in situ reconstitution of structurally and functionally acceptable esophageal tissue...

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..Routine histologic examination alone is inadequate to determine the phenotype of mononuclear cells that participate in the host response to the scaffold...

..We conclude that UBM facilitates a constructive remodeling of myocardial tissue when used as replacement scaffold for excisional defects...

..The biologic response to these xenogeneic bioscaffolds, including the immune response, is discussed herein...

..This article reviews composition of mammalian ECM, its poorly understood role in developmental biology, and the clinical applications that have resulted from the use of this naturally occurring scaffold...

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..These results show that ECM hydrogel properties can be varied and partially controlled by the scaffold tissue source, and that these properties can markedly affect cell behavior...

..The processing of dECM and PEUU from a mixed solution thus provided a scaffold with evidence of better bioactivity and with mechanical properties not achievable with digested dECM alone...

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..These results suggest that current endotoxin standards may fall well below levels that induce an adverse acute proinflammatory response and associated long-term deleterious effects upon tissue remodeling outcomes...

..The present findings demonstrate the recruitment of endogenous stem cells to a site of injury, and/or their generation/proliferation therein, in response to ECM degradation products...

..Furthermore, the constructive remodeling response was associated with a dominant M2 macrophage response...

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..These results suggest that CNS ECM may provide tissue-specific advantages in CNS regenerative medicine applications and that ECM scaffolds in general may aid functional recovery after CNS injury...

..These results suggest that superior tissue remodeling outcomes are not universally dependent upon homologous tissue derived ECM scaffold materials...

..These findings show that early exposure of site-appropriate mechanical loading (i.e., bladder filling) mediates a constructive remodeling response after ECM repair in a canine partial cystectomy model...

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..Furthermore, the results show that the surface characteristics of an ECM scaffold are changed through chemical cross-linking...

..05). A more thorough understanding of these issues will logically influence the design of next generation biomaterials and the development of regenerative medicine strategies for the formation of functional host tissues...

..These results are in sharp contrast to Dacron, a commonly used myocardial patch...

..We conclude that lyophilization affects the overall in vitro cell growth of NIH 3T3 cells and the ultrastructural morphology of UBM devices, but does not result in significant changes in structural properties...

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..A device composed of extracellular matrix (ECM) was investigated as an inductive template in vivo for reconstruction of the temporomandibular joint (TMJ) disk after discectomy...

..We evaluated the infection resistance of five different materials in a rat model of body wall repair, two of which, urinary bladder matrix (UBM-ECM) and Revive, were not previously evaluated in a controlled model of infection...

..M2 macrophages within the various scaffolds. A clear association between macrophage phenotype and remodeling outcome exists and effective decellularization remains an important component in the processing of ECM-based scaffolds...

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..The findings of the present study show that the presence of the Gal epitope within a porcine-derived ECM scaffold material elicits a serum antibody response, but no adverse effect upon tissue remodeling...

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..In summary, distinct differences exist in the mechanical, structural, and biologic properties of SIS-ECM harvested from different aged animals...

..Collagen-binding domain acted as an intermediary to promote hepatocyte growth factor binding and enhance hepatocyte growth factor stability within urinary bladder matrix...

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..The present study provides a reproducible animal model with which to study VML and shows the therapeutic potential of a bioscaffold-based regenerative medicine approach to VML...

..Results showed that peripheral blood monocytes are required for the early and rapid degradation of both SIS scaffolds and autologous body wall, and that CDI crosslinked SIS is resistant to macrophage-mediated degradation...

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..Nonaffine structural models will be necessary to fully predict the fiber kinematics under large uniaxial strains in SIS...

..The findings of this study show that non-crosslinked xenogeneic SIS scaffolds and autologous tissue are associated with the restoration of functional skeletal muscle with histomorphologic characteristics that resemble native muscle...

..We conclude that adrenal ECM supports endocrine function and proliferation of adrenocortical cells in vitro. Adrenal ECM scaffolds may form the basis for biocompatible tissue-engineered adrenal replacements...

..The findings of this study suggest that the reconstruction of tissues in which innervation is an important functional component is possible with the use of biological scaffolds composed of extracellular matrix...

..All hydrogels promoted three-dimensional uni- or bi-polar neurite outgrowth following 7 days in culture. These results suggest that CNS-ECM hydrogels may provide supportive scaffolding to promote in vivo axonal repair...

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..The devices elicited a similar inflammatory response and the presence of a mild foreign body response in spite of the different composition and morphology of these composite mesh materials...

..The objective of this study was to determine technical feasibility of transoral resection of the esophageal lining...

..Both mouse strains show a similar healing response by day 14...

..These findings suggest that the high morbidity rate associated with esophagectomy procedures may be reduced by this ECM augmentation procedure at the anastomotic site...

..One of the limitations of this technique is that extensive mucosal resection and endoscopic submucosal dissection may be required to obtain complete removal of the neoplasm, which may result in significant stricture formation...

..However, for long-term success, it appears that pre-implantation to allow vascularization or preseeding of the graft with chondrocytes will be necessary...

..There are distinct differences in the mechanical behavior of different layers of ECM from the porcine urinary bladder, and the processing methods can substantially alter the mechanical behavior observed...

..Dacron showed oxygen diffusivity values seven times greater than the ECM biomaterials. The current study showed that each material has unique oxygen diffusivity values, and these values may be dependent on the scaffold's ultrastructure...

..The proposed approximations were used to compute biaxial failure properties for a variety of multilaminate ECM devices with varying number of layers, disinfection and sterilization, and organ origin...

..The objective of the study was to evaluate a naturally derived liver extracellular matrix (L-ECM) scaffold for repair of an acute injury to the vocal fold lamina propria in a canine model...

..To test urinary bladder matrix (UBM) as a potential treatment for tympanic membrane (TM) healing and regeneration...

..We conclude that the production of a comminuted form of ECM is possible and that the uniformity of particle size and shape are dependent upon the manufacturing methodology...

..The described elastic biohybrid material imparts features of ECM gel bioactivity with PEUU strength and handling to provide a promising composite biomaterial for soft tissue repair and replacement...

..We conclude that like Matrigel, PLECM represents a favorable substrate for in vitro culture of human hepatocytes...

..03). The ECM implant material was more resistant than the synthetic implant material to persistent infection following deliberate bacterial contamination and the ECM scaffold supported constructive tissue remodeling...

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..The replacement of complex tissues and 3-dimensional organs may require specialized scaffolds to support multiple, functional cell phenotypes...

..In the present study, we evaluated the remodeled scaffold for evidence of electrical activation...

..This model represents the first described quantitative method to determine the rate of degradation for an ECM scaffold and to track the fate of the degradation products...

..These findings support the concept that degradation products of ECM bioscaffolds are important modulators of the recruitment and proliferation of appropriate cell types during the process of ECM scaffold remodeling...

..The present study investigates a new, minimally disruptive method for whole-organ liver decellularization and three different cell reseeding strategies to engineer functional liver tissue...

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..The intact decellularized porcine heart provides a tissue engineering template that may be beneficial for future preclinical studies and eventual clinical applications...

..The present study showed that the choice of terminal sterilization method affects the structural properties of scaffolds composed of extracellular matrix...

..05). These results indicate that structural changes in the UBM device may slowly occur as a function of prolonged storage and storage temperature...

..ECM scaffolds facilitate site-specific tissue remodeling when used to reconstruct a variety of soft-tissue structures...

..This study shows that a naturally occurring ECM scaffold promotes site-specific constructive remodeling in a large thoracic wall defect...

..Results showed that the majority of DNA is removed from ECM devices but that small amounts remained in most tested materials...

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..Electrospun UBM/PEUU combined the attractive bioactivity and mechanical features of its individual components to result in scaffolds with considerable potential for soft tissue engineering applications...

..The magnitude and temporal pattern of the chemotactic response differed between the two mouse strains...

..Several approaches have been investigated to prevent seroma formation by draining fluid or attempting to eliminate dead space, but these approaches have limited effectiveness...

..The present study showed that an intact form of UBM can be successfully solubilized without purification steps and induced to repolymerize into a gel form of the UBM biologic scaffold material...

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..The authors hypothesized that particulate small intestinal submucosa could be useful as injectable cell delivery vehicles for preadipocytes, and that the release of fibroblast growth factor (FGF)-2 would enhance vascularization...

..The purposes of this article are to provide a current perspective on biological approaches to the management of musculoskeletal disorders and to highlight the needed integration of physical therapeutics with regenerative medicine...

..Herein, the most commonly used decellularization methods are described, and consideration give to the effects of these methods upon the biologic scaffold material...

..A discussion of the mechanisms of ECM remodeling is presented along with the implications of such remodeling in the repair of laryngeal structures...

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..The ECM-induced remodeling response is a distinctly different phenomenon from that of scar tissue formation...

..7+/-50.8 N, 432.12+/-82.1 N, and 433.6+/-79.5 N respectively. CONCLUSIONS: All three materials provide adequate strength and suture-holding capacities to be of use in the repair of soft tissue defects...

..e. vascular, musculotendinous, etc) by varying the number of layers and modifying the disinfection/sterilization treatments used for manufacturing...

..Heart failure remains a significant problem. Tissue-engineered cardiac patches offer potential to treat severe heart failure. We studied an extracellular matrix scaffold for repairing the infarcted left ventricle...

..CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that endoscopically guided injection of particulate ECM into the internal urethral sphincter may be useful for the treatment of acquired urinary incontinence in female dogs...

..The involvement of these cells in the remodeling process may explain in part the process of site specific constructive remodeling as opposed to scar tissue formation when the ECM is used as a biologic scaffold for tendon reconstruction...

..Our data indicate that LBM may be a favorable alternative to existing scaffolds for tissue engineering in that it is bioresorbable, can be easily manipulated, and supports long-term hepatocellular functions in vitro...

..ABT-526 and ABT-510 are the first compounds in the class of potent inhibitors of angiogenesis that mimic the antiangiogenic function of TSP-1. ABT-510 is currently in phase II clinical studies...

..Therefore, SIS implantation does not increase susceptibility to viral or bacterial pathogenic agents...

..We conclude that, in contrast to xenotransplantation of whole organs, naturally-occurring anti-alpha gal antibodies do not influence the ability of xenogeneic extracellular matrices to serve as bioscaffolds for tissue remodeling...

..A timeline for completion of these studies, hypotheses to drive the specific aims, alternative approaches for completion of the work, and quantitative criteria for success are provided. ..

..The objectives of the studies, the hypothesis upon which the experimental design is based, and a timeline for completion of the studies are presented. ..

..We have identified clearly defined specific aims with quantifiable end points and an efficient three year timeline to conduct this work. ..

..The objectives of the studies, the hypothesis upon which the experimental design is based, and a timeline for completion of the studies are presented. ..

..We have identified clearly defined specific aims with quantifiable end points and an efficient three year timeline to conduct this work. ..

..The work will be conducted by an experienced interdisciplinary team of scientists and a timeline is presented for completion of the work. ..

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..The objectives of the studies, the hypothesis upon which the experimental design is based, and a timeline for completion of the studies are presented. ..