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Robert Langer

Stephany Y Tzeng, Kevin J McHugh, Adam M Behrens, Sviatlana Rose, James L Sugarman, Shiran Ferber, Robert Langer, Ana Jaklenec
Vaccination in the developing world is hampered by limited patient access, which prevents individuals from receiving the multiple injections necessary for protective immunity. Here, we developed an injectable microparticle formulation of the inactivated polio vaccine (IPV) that releases multiple pulses of stable antigen over time. To accomplish this, we established an IPV stabilization strategy using cationic polymers for pH modulation to enhance traditional small-molecule-based stabilization methods. We investigated the mechanism of this strategy and showed that it was broadly applicable to all three antigens in IPV...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
Álvaro Raya-Barón, Carmen P Galdeano-Ruano, Pascual Oña-Burgos, Antonio Rodríguez-Diéguez, Robert Langer, Rosalía López-Ruiz, Roberto Romero-González, Istemi Kuzu, Ignacio Fernández
The reaction of 1-((2-(pyridin-2-yl)ethyl)amino)anthraquinone with either Fe(HMDS)2 or Li(HMDS)/FeCl2 allowed the preparation of a new anthraquinoid-based iron(ii) complex active in the hydrosilylations of carbonyls. The new complex Fe(2)2 was characterized by single-crystal X-ray diffraction, infrared spectroscopy, NMR, and high resolution mass spectrometry (electrospray ionization). Superconducting quantum interference device (SQUID) magnetometry established no spin crossover behavior with an S = 2 state at room temperature...
May 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Isabelle Jasch, Antje Langer, Moritz Boley, Rebekka Mumm, Martin Riesenberg, Robert Mann, Joachim Wahl
The proper description of former populations is one of the most difficult tasks in anthropology. Archaeological material is often limited due to fragmented and sometimes poorly preserved bone material resulting in incomplete data. Published skeletal raw data are available from the past, but much of this data is either unavailable or not used for scientific studies. The authors seek to elicit more information about prehistoric times by using this dataset to introduce a new method. The purpose is to provide an approach to reconstruct a former population in respect to robusticity and health status...
May 15, 2018: Anthropologischer Anzeiger; Bericht über die Biologisch-anthropologische Literatur
Dewy C van der Valk, Casper F T van der Ven, Mark C Blaser, Joshua M Grolman, Pin-Jou Wu, Owen S Fenton, Lang H Lee, Mark W Tibbitt, Jason L Andresen, Jennifer R Wen, Anna H Ha, Fabrizio Buffolo, Alain van Mil, Carlijn V C Bouten, Simon C Body, David J Mooney, Joost P G Sluijter, Masanori Aikawa, Jesper Hjortnaes, Robert Langer, Elena Aikawa
In calcific aortic valve disease (CAVD), microcalcifications originating from nanoscale calcifying vesicles disrupt the aortic valve (AV) leaflets, which consist of three (biomechanically) distinct layers: the fibrosa, spongiosa, and ventricularis. CAVD has no pharmacotherapy and lacks in vitro models as a result of complex valvular biomechanical features surrounding resident mechanosensitive valvular interstitial cells (VICs). We measured layer-specific mechanical properties of the human AV and engineered a three-dimensional (3D)-bioprinted CAVD model that recapitulates leaflet layer biomechanics for the first time...
May 3, 2018: Nanomaterials
Owen S Fenton, Katy N Olafson, Padmini S Pillai, Michael J Mitchell, Robert Langer
Advances in biomaterials for drug delivery are enabling significant progress in biology and medicine. Multidisciplinary collaborations between physical scientists, engineers, biologists, and clinicians generate innovative strategies and materials to treat a range of diseases. Specifically, recent advances include major breakthroughs in materials for cancer immunotherapy, autoimmune diseases, and genome editing. Here, strategies for the design and implementation of biomaterials for drug delivery are reviewed...
May 7, 2018: Advanced Materials
Shiran Ferber, Adam M Behrens, Kevin J McHugh, Evan M Rosenberg, Allison R Linehan, James L Sugarman, Hapuarachchige Surangi N Jayawardena, Robert Langer, Ana Jaklenec
Stabilizing thermolabile pharmaceuticals outside of the cold chain has the potential to alleviate some of the logistical and monetary burden of providing health care access in the developing world. Evaporative cooling hydrogel packaging is designed to extend the storage stability of existing pharmaceutical products without the need for reformulation. Hydrogels with high water content and reversible hydrophilicity offer a promising platform for reducing storage temperatures without refrigeration. As a model, poly(N-isopropylacrylamide) is selected as a basis for creating a potentially low cost and easy-to-fabricate hydrogels...
May 7, 2018: Advanced Healthcare Materials
Alain M Jonas, Karine Glinel, Adam Behrens, Aaron C Anselmo, Robert Langer, Ana Jaklenec
Commensal skin bacteria such as Staphylococcus epidermidis are currently being considered as possible components in skin-care and -health products. However, considering the potentially adverse effects of commensal skin bacteria if left free to proliferate, it is crucial to develop methodologies that are capable of maintaining bacteria viability while controlling their proliferation. Here, we encapsulate S. epidermidis in shells of increasing thickness using layer-by-layer assembly, with either a pair of synthetic polyelectrolytes or a pair of oppositely-charged polysaccharides...
April 25, 2018: ACS Applied Materials & Interfaces
Christian Schneider, Robert Langer, Donald Loveday, Dirk Hair
No abstract text is available yet for this article.
April 20, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Andrew M Ayoob, Marcello Peppi, Vishal Tandon, Robert Langer, Jeffrey T Borenstein
Advances in microelectromechanical systems (MEMS) technologies are enhancing the development of intracochlear delivery devices for the treatment of hearing loss with emerging pharmacological therapies. Direct intracochlear delivery addresses the limitations of systemic and intratympanic delivery. However, optimization of delivery parameters for these devices requires pharmacokinetic assessment of the spatiotemporal drug distribution inside the cochlea. Robust methods of measuring drug concentration in the perilymph have been developed, but lack spatial resolution along the tonotopic axis or require complex physiological measurements...
April 5, 2018: Hearing Research
Angela M DiCiccio, Young-Ah Lucy Lee, Dean L Glettig, Elizabeth S E Walton, Eva L de la Serna, Veronica A Montgomery, Tyler M Grant, Robert Langer, Giovanni Traverso
Covalently cross-linked gels are utilized in a broad range of biomedical applications though their synthesis often compromises easy implementation. Cross-linking reactions commonly utilize catalysts or conditions that can damage biologics and sensitive compounds, producing materials that require extensive post processing to achieve acceptable biocompatibility. As an alternative, we report a batch synthesis platform to produce covalently cross-linked materials appropriate for direct biomedical application enabled by green chemistry and commonly available food grade ingredients...
April 6, 2018: Biomaterials
Markus Brown, Louise A Johnson, Dario A Leone, Peter Majek, Kari Vaahtomeri, Daniel Senfter, Nora Bukosza, Helga Schachner, Gabriele Asfour, Brigitte Langer, Robert Hauschild, Katja Parapatics, Young-Kwon Hong, Keiryn L Bennett, Renate Kain, Michael Detmar, Michael Sixt, David G Jackson, Dontscho Kerjaschki
Lymphatic endothelial cells (LECs) release extracellular chemokines to guide the migration of dendritic cells. In this study, we report that LECs also release basolateral exosome-rich endothelial vesicles (EEVs) that are secreted in greater numbers in the presence of inflammatory cytokines and accumulate in the perivascular stroma of small lymphatic vessels in human chronic inflammatory diseases. Proteomic analyses of EEV fractions identified >1,700 cargo proteins and revealed a dominant motility-promoting protein signature...
April 12, 2018: Journal of Cell Biology
Héloïse Ragelle, Mark W Tibbitt, Shang-Yun Wu, Michael A Castillo, George Z Cheng, Sidharta P Gangadharan, Daniel G Anderson, Michael J Cima, Robert Langer
The proliferation of computer-aided design and additive manufacturing enables on-demand fabrication of complex, three-dimensional structures. However, combining the versatility of cell-laden hydrogels within the 3D printing process remains a challenge. Herein, we describe a facile and versatile method that integrates polymer networks (including hydrogels) with 3D-printed mechanical supports to fabricate multicomponent (bio)materials. The approach exploits surface tension to coat fenestrated surfaces with suspended liquid films that can be transformed into solid films...
March 22, 2018: Nature Communications
Rebekah J Stewart, Clarisse A Tsang, Robert H Pratt, Sandy F Price, Adam J Langer
In 2017, a total of 9,093 new cases of tuberculosis (TB) were provisionally* reported in the United States, representing an incidence rate of 2.8 cases per 100,000 population. The case count decreased by 1.8% from 2016 to 2017, and the rate declined by 2.5% over the same period. These decreases are consistent with the slight decline in TB seen over the past several years (1). This report summarizes provisional TB surveillance data reported to CDC's National Tuberculosis Surveillance System for 2017 and in the last decade...
March 23, 2018: MMWR. Morbidity and Mortality Weekly Report
Robert Roehle, Viktoria Wieske, Georg M Schuetz, Pascal Gueret, Daniele Andreini, Willem Bob Meijboom, Gianluca Pontone, Mario Garcia, Hatem Alkadhi, Lily Honoris, Jörg Hausleiter, Nuno Bettencourt, Elke Zimmermann, Sebastian Leschka, Bernhard Gerber, Carlos Rochitte, U Joseph Schoepf, Abbas Arjmand Shabestari, Bjarne Nørgaard, Akira Sato, Juhani Knuuti, Matthijs F L Meijs, Harald Brodoefel, Shona M M Jenkins, Kristian Altern Øvrehus, Axel Cosmus Pyndt Diederichsen, Ashraf Hamdan, Bjørn Arild Halvorsen, Vladimir Mendoza Rodriguez, Yung Liang Wan, Johannes Rixe, Mehraj Sheikh, Christoph Langer, Said Ghostine, Eugenio Martuscelli, Hiroyuki Niinuma, Arthur Scholte, Konstantin Nikolaou, Geir Ulimoen, Zhaoqi Zhang, Hans Mickley, Koen Nieman, Philipp A Kaufmann, Ronny Ralf Buechel, Bernhard A Herzog, Melvin Clouse, David A Halon, Jonathan Leipsic, David Bush, Reda Jakamy, Kai Sun, Lin Yang, Thorsten Johnson, Jean-Pierre Laissy, Roy Marcus, Simone Muraglia, Jean-Claude Tardif, Benjamin Chow, Narinder Paul, David Maintz, John Hoe, Albert de Roos, Robert Haase, Michael Laule, Peter Schlattmann, Marc Dewey
OBJECTIVES: To analyse the implementation, applicability and accuracy of the pretest probability calculation provided by NICE clinical guideline 95 for decision making about imaging in patients with chest pain of recent onset. METHODS: The definitions for pretest probability calculation in the original Duke clinical score and the NICE guideline were compared. We also calculated the agreement and disagreement in pretest probability and the resulting imaging and management groups based on individual patient data from the Collaborative Meta-Analysis of Cardiac CT (CoMe-CCT)...
March 19, 2018: European Radiology
Soo-Young Kang, Zhaoxia Ji, Ling-Fang Tseng, Sara A Turner, Dinara A Villanueva, Rhiannon Johnson, Ariana Albano, Robert Langer
Waterborne polyurethanes (WBPUs) have attracted increasing attention in a wide range of industrial applications because of their versatile properties as well as ecofriendly nature. Although extensive research has been carried out on WBPU synthesis, the roles of some of the key synthesis components remain unclear. In this study, through systematically controlling and fine tuning the precursor compositions and reaction conditions, over 300 WBPUs are synthesized. This research enables the roles of several key components that govern WBPU physicochemical properties and ultimately the potential WBPU applications to be identified...
May 2018: Advanced Materials
Michael R Rickels, Peter G Stock, Eelco J P de Koning, Lorenzo Piemonti, Johann Pratschke, Rodolfo Alejandro, Melena D Bellin, Thierry Berney, Pratik Choudhary, Paul R Johnson, Raja Kandaswamy, Thomas W H Kay, Bart Keymeulen, Yogish C Kudva, Esther Latres, Robert M Langer, Roger Lehmann, Barbara Ludwig, James F Markmann, Marjana Marinac, Jon S Odorico, François Pattou, Peter A Senior, James A M Shaw, Marie-Christine Vantyghem, Steven White
β-cell replacement therapy, available currently as pancreas or islet transplantation, has developed without a clear definition of graft functional and clinical outcomes. The International Pancreas & Islet Transplant Association (IPITA) and European Pancreas & Islet Transplantation Association (EPITA) held a workshop to develop consensus for an IPITA/EPITA Statement on the definition of function and failure of current and future forms of β-cell replacement therapy. There was consensus that β-cell replacement therapy could be considered as a treatment for β-cell failure, regardless of etiology and without requiring undetectable C-peptide, accompanied by glycemic instability with either problematic hypoglycemia or hyperglycemia...
March 9, 2018: Transplantation
Giovanni Traverso, Ameya R Kirtane, Carl M Schoellhammer, Robert Langer
The void between drug discovery and successful translation to humans is vast. In order to develop effective solutions, convergence of a multidisciplinary team with a range of expertise is required. In this Essay, examples of successful sustained delivery systems for antimalarials and antiretrovirals, as well as to the gastrointestinal tract are discussed.
April 9, 2018: Angewandte Chemie
Kevin J Kauffman, Matthias A Oberli, J Robert Dorkin, Juan E Hurtado, James C Kaczmarek, Shivani Bhadani, Jeff Wyckoff, Robert Langer, Ana Jaklenec, Daniel G Anderson
mRNA therapeutics hold promise for the treatment of diseases requiring intracellular protein expression and for use in genome editing systems, but mRNA must transfect the desired tissue and cell type to be efficacious. Nanoparticle vectors that deliver the mRNA are often evaluated using mRNA encoding for reporter genes such as firefly luciferase (FLuc); however, single-cell resolution of mRNA expression cannot generally be achieved with FLuc, and, thus, the transfected cell populations cannot be determined without additional steps or experiments...
March 2, 2018: Molecular Therapy. Nucleic Acids
Jenny K Hoang, William D Middleton, Alfredo E Farjat, Jill E Langer, Carl C Reading, Sharlene A Teefey, Nicole Abinanti, Fernando J Boschini, Abraham J Bronner, Nirvikar Dahiya, Barbara S Hertzberg, Justin R Newman, Daniel Scanga, Robert C Vogler, Franklin N Tessler
Purpose To compare the biopsy rate and diagnostic accuracy before and after applying the American College of Radiology (ACR) Thyroid Imaging Reporting and Data System (TI-RADS) criteria for thyroid nodule evaluation. Materials and Methods In this retrospective study, eight radiologists with 3-32 years experience in thyroid ultrasonography (US) reviewed US features of 100 thyroid nodules that were cytologically proven, pathologically proven, or both in December 2016. The radiologists evaluated nodule features in five US categories and provided biopsy recommendations based on their own practice patterns without knowledge of ACR TI-RADS criteria...
April 2018: Radiology
Kevin J McHugh, Lihong Jing, Adam M Behrens, Surangi Jayawardena, Wen Tang, Mingyuan Gao, Robert Langer, Ana Jaklenec
Approximately 1.7 million new cases of cancer will be diagnosed this year in the United States leading to 600 000 deaths. Patient survival rates are highly correlated with the stage of cancer diagnosis, with localized and regional remission rates that are much higher than for metastatic cancer. The current standard of care for many solid tumors includes imaging and biopsy with histological assessment. In many cases, after tomographical imaging modalities have identified abnormal morphology consistent with cancer, surgery is performed to remove the primary tumor and evaluate the surrounding lymph nodes...
May 2018: Advanced Materials
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