303 results found
Albro MB, Bergholt MS, St-Pierre JP, et al., 2018, Raman spectroscopic imaging for quantification of depth-dependent and local heterogeneities in native and engineered cartilage., NPJ Regen Med, Vol: 3
Articular cartilage possesses a remarkable, mechanically-robust extracellular matrix (ECM) that is organized and distributed throughout the tissue to resist physiologic strains and provide low friction during articulation. The ability to characterize the make-up and distribution of the cartilage ECM is critical to both understand the process by which articular cartilage undergoes disease-related degeneration and to develop novel tissue repair strategies to restore tissue functionality. However, the ability to quantitatively measure the spatial distribution of cartilage ECM constituents throughout the tissue has remained a major challenge. In this experimental investigation, we assessed the analytical ability of Raman micro-spectroscopic imaging to semi-quantitatively measure the distribution of the major ECM constituents in cartilage tissues. Raman spectroscopic images were acquired of two distinct cartilage tissue types that possess large spatial ECM gradients throughout their depth: native articular cartilage explants and large engineered cartilage tissue constructs. Spectral acquisitions were processed via multivariate curve resolution to decompose the "fingerprint" range spectra (800-1800 cm-1) to the component spectra of GAG, collagen, and water, giving rise to the depth dependent concentration profile of each constituent throughout the tissues. These Raman spectroscopic acquired-profiles exhibited strong agreement with profiles independently acquired via direct biochemical assaying of spatial tissue sections. Further, we harness this spectroscopic technique to evaluate local heterogeneities through the depth of cartilage. This work represents a powerful analytical validation of the accuracy of Raman spectroscopic imaging measurements of the spatial distribution of biochemical components in a biological tissue and shows that it can be used as a valuable tool for quantitatively measuring the distribution and organization of ECM constituents in n
Bergholt MS, Serio A, McKenzie JS, et al., 2018, Correlated Heterospectral Lipidomics for Biomolecular Profiling of Remyelination in Multiple Sclerosis, ACS CENTRAL SCIENCE, Vol: 4, Pages: 39-51, ISSN: 2374-7943
Brangel P, Sobarzo A, Parolo C, et al., 2018, A Serological Point-of-Care Test for the Detection of IgG Antibodies against Ebola Virus in Human Survivors, ACS NANO, Vol: 12, Pages: 63-73, ISSN: 1936-0851
Fuhrmann G, Chandrawati R, Parmar PA, et al., 2018, Engineering Extracellular Vesicles with the Tools of Enzyme Prodrug Therapy., Adv Mater
Extracellular vesicles (EVs) have recently gained significant attention as important mediators of intercellular communication, potential drug carriers, and disease biomarkers. These natural cell-derived nanoparticles are postulated to be biocompatible, stable under physiological conditions, and to show reduced immunogenicity as compared to other synthetic nanoparticles. Although initial clinical trials are ongoing, the use of EVs for therapeutic applications may be limited due to undesired off-target activity and potential "dilution effects" upon systemic administration which may affect their ability to reach their target tissues. To fully exploit their therapeutic potential, EVs are embedded into implantable biomaterials designed to achieve local delivery of therapeutics taking advantage of enzyme prodrug therapy (EPT). In this first application of EVs for an EPT approach, EVs are used as smart carriers for stabilizing enzymes in a hydrogel for local controlled conversion of benign prodrugs to active antiinflammatory compounds. It is shown that the natural EVs' antiinflammatory potential is comparable or superior to synthetic carriers, in particular upon repeated long-term incubations and in different macrophage models of inflammation. Moreover, density-dependent color scanning electron microscopy imaging of EVs in a hydrogel is presented herein, an impactful tool for further understanding EVs in biological settings.
Hsu C-C, Serio A, Arndursky N, et al., 2018, Fabrication of Hemin-Doped Serum Albumin-Based Fibrous Scaffolds for Neural Tissue Engineering Applications, ACS APPLIED MATERIALS & INTERFACES, Vol: 10, Pages: 5305-5317, ISSN: 1944-8244
Jumeaux C, Wahlsten O, Block S, et al., 2018, MicroRNA Detection by DNA-Mediated Liposome Fusion., Chembiochem, Vol: 19, Pages: 434-438
Membrane fusion is a process of fundamental importance in biological systems that involves highly selective recognition mechanisms for the trafficking of molecular and ionic cargos. Mimicking natural membrane fusion mechanisms for the purpose of biosensor development holds great potential for amplified detection because relatively few highly discriminating targets lead to fusion and an accompanied engagement of a large payload of signal-generating molecules. In this work, sequence-specific DNA-mediated liposome fusion is used for the highly selective detection of microRNA. The detection of miR-29a, a known flu biomarker, is demonstrated down to 18 nm within 30 min with high specificity by using a standard laboratory microplate reader. Furthermore, one order of magnitude improvement in the limit of detection is demonstrated by using a novel imaging technique combined with an intensity fluctuation analysis, which is coined two-color fluorescence correlation microscopy.
Keane TJ, Horejs C-M, Stevens MM, 2018, Scarring vs. functional healing: Matrix-based strategies to regulate tissue repair., Adv Drug Deliv Rev
All vertebrates possess mechanisms to restore damaged tissues with outcomes ranging from regeneration to scarring. Unfortunately, the mammalian response to tissue injury most often culminates in scar formation. Accounting for nearly 45% of deaths in the developed world, fibrosis is a process that stands diametrically opposed to functional tissue regeneration. Strategies to improve wound healing outcomes therefore require methods to limit fibrosis. Wound healing is guided by precise spatiotemporal deposition and remodelling of the extracellular matrix (ECM). The ECM, comprising the non-cellular component of tissues, is a signalling depot that is differentially regulated in scarring and regenerative healing. This Review focuses on the importance of the native matrix components during mammalian wound healing alongside a comparison to scar-free healing and then presents an overview of matrix-based strategies that attempt to exploit the role of the ECM to improve wound healing outcomes.
Littmann E, Autefage H, Solanki AK, et al., 2018, Cobalt-containing bioactive glasses reduce human mesenchymal stem cell chondrogenic differentiation despite HIF-1 alpha stabilisation, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, Vol: 38, Pages: 877-886, ISSN: 0955-2219
Loynachan CN, Thomas MR, Gray ER, et al., 2018, Platinum Nanocatalyst Amplification: Redefining the Gold Standard for Lateral Flow Immunoassays with Ultrabroad Dynamic Range, ACS NANO, Vol: 12, Pages: 279-288, ISSN: 1936-0851
Milner PE, Parkes M, Puetzer JL, et al., 2018, A low friction, biphasic and boundary lubricating hydrogel for cartilage replacement, ACTA BIOMATERIALIA, Vol: 65, Pages: 102-111, ISSN: 1742-7061
Rizzo R, Alvaro M, Danz N, et al., 2018, Bloch surface wave enhanced biosensor for the direct detection of angiopoietin-2 tumor biomarker in human plasma, Biomedical Optics Express, Vol: 9, Pages: 529-542, ISSN: 2156-7085
Quantitative detection of angiogenic biomarkers provides a powerful tool to diagnose cancers in early stages and to follow its progression during therapy. Conventional tests require trained personnel, dedicated laboratory equipment and are generally time-consuming. Herein, we propose our developed biosensing platform as a useful tool for a rapid determination of Angiopoietin-2 biomarker directly from patient plasma within 30 minutes, without any sample preparation or dilution. Bloch surface waves supported by one dimensional photonic crystal are exploited to enhance and redirect the fluorescence arising from a sandwich immunoassay that involves Angiopoietin-2. The sensing units consist of disposable and low-cost plastic biochips coated with the photonic crystal. The biosensing platform is demonstrated to detect Angiopoietin-2 in plasma samples at the clinically relevant concentration of 6 ng/mL, with an estimated limit of detection of approximately 1 ng/mL. This is the first Bloch surface wave based assay capable of detecting relevant concentrations of an angiogenic factor in plasma samples. The results obtained by the developed biosensing platform are in close agreement with enzyme-linked immunosorbent assays, demonstrating a good accuracy, and their repeatability showed acceptable relative variations.
Spicer CD, Jumeaux C, Gupta B, et al., 2018, Peptide and protein nanoparticle conjugates: versatile platforms for biomedical applications., Chem Soc Rev
Peptide- and protein-nanoparticle conjugates have emerged as powerful tools for biomedical applications, enabling the treatment, diagnosis, and prevention of disease. In this review, we focus on the key roles played by peptides and proteins in improving, controlling, and defining the performance of nanotechnologies. Within this framework, we provide a comprehensive overview of the key sequences and structures utilised to provide biological and physical stability to nano-constructs, direct particles to their target and influence their cellular and tissue distribution, induce and control biological responses, and form polypeptide self-assembled nanoparticles. In doing so, we highlight the great advances made by the field, as well as the challenges still faced in achieving the clinical translation of peptide- and protein-functionalised nano-drug delivery vehicles, imaging species, and active therapeutics.
von Erlach TC, Bertazzo S, Wozniak MA, et al., 2018, Cell-geometry-dependent changes in plasma membrane order direct stem cell signalling and fate., Nat Mater, Vol: 17, Pages: 237-242, ISSN: 1476-1122
Cell size and shape affect cellular processes such as cell survival, growth and differentiation1-4, thus establishing cell geometry as a fundamental regulator of cell physiology. The contributions of the cytoskeleton, specifically actomyosin tension, to these effects have been described, but the exact biophysical mechanisms that translate changes in cell geometry to changes in cell behaviour remain mostly unresolved. Using a variety of innovative materials techniques, we demonstrate that the nanostructure and lipid assembly within the cell plasma membrane are regulated by cell geometry in a ligand-independent manner. These biophysical changes trigger signalling events involving the serine/threonine kinase Akt/protein kinase B (PKB) that direct cell-geometry-dependent mesenchymal stem cell differentiation. Our study defines a central regulatory role by plasma membrane ordered lipid raft microdomains in modulating stem cell differentiation with potential translational applications.
Amdursky N, Rashid MH, Stevens MM, et al., 2017, Exploring the binding sites and proton diffusion on insulin amyloid fibril surfaces by naphthol-based photoacid fluorescence and molecular simulations, SCIENTIFIC REPORTS, Vol: 7, ISSN: 2045-2322
Amdursky N, Wang X, Meredith P, et al., 2017, Electron Hopping Across Hemin-Doped Serum Albumin Mats on Centimeter-Length Scales, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648
Armstrong JPK, Holme MN, Stevens MM, 2017, Re-Engineering Extracellular Vesicles as Smart Nanoscale Therapeutics, ACS NANO, Vol: 11, Pages: 69-83, ISSN: 1936-0851
Bergholt MS, Albro MB, Stevens MM, 2017, Online quantitative monitoring of live cell engineered cartilage growth using diffuse fiber-optic Raman spectroscopy, BIOMATERIALS, Vol: 140, Pages: 128-137, ISSN: 0142-9612
Chandrawati R, Chang JYH, Reina-Torres E, et al., 2017, Localized and Controlled Delivery of Nitric Oxide to the Conventional Outflow Pathway via Enzyme Biocatalysis: Toward Therapy for Glaucoma, ADVANCED MATERIALS, Vol: 29, ISSN: 0935-9648
Chandrawati R, Olesen MTJ, Marini TCC, et al., 2017, Enzyme Prodrug Therapy Engineered into Electrospun Fibers with Embedded Liposomes for Controlled, Localized Synthesis of Therapeutics, ADVANCED HEALTHCARE MATERIALS, Vol: 6, ISSN: 2192-2640
Chang JYH, Chow LW, Dismuke WM, et al., 2017, Peptide-Functionalized Fluorescent Particles for In Situ Detection of Nitric Oxide via Peroxynitrite-Mediated Nitration, ADVANCED HEALTHCARE MATERIALS, Vol: 6, ISSN: 2192-2640
Chow A, Stuckey DJ, Kidher E, et al., 2017, Human Induced Pluripotent Stem Cell-Derived Cardiomyocyte Encapsulating Bioactive Hydrogels Improve Rat Heart Function Post Myocardial Infarction, STEM CELL REPORTS, Vol: 9, Pages: 1415-1422, ISSN: 2213-6711
Chung JJ, Fujita Y, Li S, et al., 2017, Biodegradable inorganic-organic hybrids of methacrylate star polymers for bone regeneration, ACTA BIOMATERIALIA, Vol: 54, Pages: 411-418, ISSN: 1742-7061
Chung JJ, Sum BST, Li S, et al., 2017, Effect of Comonomers on Physical Properties and Cell Attachment to Silica-Methacrylate/Acrylate Hybrids for Bone Substitution, MACROMOLECULAR RAPID COMMUNICATIONS, Vol: 38, ISSN: 1022-1336
Clarke DE, Pashuck ET, Bertazzo S, et al., 2017, Self-Healing, Self-Assembled beta-Sheet Peptide Poly(gamma-glutamic acid) Hybrid Hydrogels, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 139, Pages: 7250-7255, ISSN: 0002-7863
Ember KJI, Hoeve MA, McAughtrie SL, et al., 2017, Raman spectroscopy and regenerative medicine: a review, NPJ REGENERATIVE MEDICINE, Vol: 2, ISSN: 2057-3995
Fiocco L, Li S, Stevens MM, et al., 2017, Biocompatibility and bioactivity of porous polymer-derived Ca-Mg silicate ceramics, ACTA BIOMATERIALIA, Vol: 50, Pages: 56-67, ISSN: 1742-7061
Guex AG, Puetzer JL, Armgarth A, et al., 2017, Highly porous scaffolds of PEDOT:PSS for bone tissue engineering, ACTA BIOMATERIALIA, Vol: 62, Pages: 91-101, ISSN: 1742-7061
Guex AG, Spicer CD, Armgarth A, et al., 2017, Electrospun aniline-tetramer-co-polycaprolactone fibers for conductive, biodegradable scaffolds, MRS COMMUNICATIONS, Vol: 7, Pages: 375-382, ISSN: 2159-6859
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