4 results on '"Eric A. Kusznir"'
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2. Evaluation of bovine milk extracellular vesicles for the delivery of locked nucleic acid antisense oligonucleotides
- Author
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Filippo Sladojevich, Remo Gamboni, Tanja Minz, Philippe Ringler, Rainer Alex, Sabine Kux van Geijtenbeek, Michaela Portmann, Axel Ducret, Matthias E. Lauer, Ravi Jagasia, Eric-André Kusznir, Bettina Nordbo, Sabine Sewing, Michael Keller, Nikhil J. Pandya, Erich Koller, Philip Grossen, Marco Berrera, Martina Brigitte Duschmalé, Sylwia Huber, and Marianne Lerbech Jensen
- Subjects
Pluripotent Stem Cells ,Drug Compounding ,media_common.quotation_subject ,Primary Cell Culture ,Drug Evaluation, Preclinical ,Oligonucleotides ,Administration, Oral ,Pharmaceutical Science ,02 engineering and technology ,030226 pharmacology & pharmacy ,Extracellular Vesicles ,Mice ,03 medical and health sciences ,0302 clinical medicine ,Lipidomics ,Animals ,Humans ,Tissue Distribution ,Locked nucleic acid ,Internalization ,media_common ,Neurons ,Drug Carriers ,Gene knockdown ,Chemistry ,General Medicine ,Oligonucleotides, Antisense ,021001 nanoscience & nanotechnology ,In vitro ,Microvesicles ,Cell biology ,Milk ,Drug delivery ,Nucleic acid ,0210 nano-technology ,Biotechnology - Abstract
The natural capacity of extracellular vesicles (EVs) to transport their payload to recipient cells has raised big interest to repurpose EVs as delivery vehicles for xenobiotics. In the present study, bovine milk-derived EVs (BMEVs) were investigated for their potential to shuttle locked nucleic acid-modified antisense oligonucleotides (LNA ASOs) into the systemic circulation after oral administration. To this end, a broad array of analytical methods including proteomics and lipidomics were used to thoroughly characterize BMEVs. We found that additional purification by density gradients efficiently reduced levels of non-EV associated proteins. The potential of BMEVs to functionally transfer LNA ASOs was tested using advanced in vitro systems (i.e. hPSC-derived neurons and primary human cells). A slight increase in cellular LNA ASO internalization and target gene reduction was observed when LNA ASOs were delivered using BMEVs. When dosed orally in mice, only a small fraction (about 1% of total administered dose) of LNA ASOs was recovered in the peripheral tissues liver and kidney, however, no significant reduction in target gene expression (i.e. functional knockdown) was observed.
- Published
- 2021
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3. Detection of cannabinoid receptor type 2 in native cells and zebrafish with a highly potent, cell-permeable fluorescent probe
- Author
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Thais Gazzi, Benjamin Brennecke, Kenneth Atz, Claudia Korn, David Sykes, Gabriel Forn-Cuni, Patrick Pfaff, Roman C. Sarott, Matthias V. Westphal, Yelena Mostinski, Leonard Mach, Malgorzata Wasinska-Kalwa, Marie Weise, Bradley L. Hoare, Tamara Miljuš, Maira Mexi, Nicolas Roth, Eline J. Koers, Wolfgang Guba, André Alker, Arne C. Rufer, Eric A. Kusznir, Sylwia Huber, Catarina Raposo, Elisabeth A. Zirwes, Anja Osterwald, Anto Pavlovic, Svenja Moes, Jennifer Beck, Matthias Nettekoven, Irene Benito-Cuesta, Teresa Grande, Faye Drawnel, Gabriella Widmer, Daniela Holzer, Tom van der Wel, Harpreet Mandhair, Michael Honer, Jürgen Fingerle, Jörg Scheffel, Johannes Broichhagen, Klaus Gawrisch, Julián Romero, Cecilia J. Hillard, Zoltan V. Varga, Mario van der Stelt, Pal Pacher, Jürg Gertsch, Christoph Ullmer, Peter J. McCormick, Sergio Oddi, Herman P. Spaink, Mauro Maccarrone, Dmitry B. Veprintsev, Erick M. Carreira, Uwe Grether, Marc Nazaré, and Publica
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570 Life sciences ,biology ,610 Medicine & health ,General Chemistry - Abstract
Despite its essential role in the (patho)physiology of several diseases, CB2R tissue expression profiles and signaling mechanisms are not yet fully understood. We report the development of a highly potent, fluorescent CB2R agonist probe employing structure-based reverse design. It commences with a highly potent, preclinically validated ligand, which is conjugated to a silicon-rhodamine fluorophore, enabling cell permeability. The probe is the first to preserve interspecies affinity and selectivity for both mouse and human CB2R. Extensive cross-validation (FACS, TR-FRET and confocal microscopy) set the stage for CB2R detection in endogenously expressing living cells along with zebrafish larvae. Together, these findings will benefit clinical translatability of CB2R based drugs.
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- 2022
- Full Text
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4. A multilaboratory comparison of calibration accuracy and the performance of external references in analytical ultracentrifugation.
- Author
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Huaying Zhao, Rodolfo Ghirlando, Carlos Alfonso, Fumio Arisaka, Ilan Attali, David L Bain, Marina M Bakhtina, Donald F Becker, Gregory J Bedwell, Ahmet Bekdemir, Tabot M D Besong, Catherine Birck, Chad A Brautigam, William Brennerman, Olwyn Byron, Agnieszka Bzowska, Jonathan B Chaires, Catherine T Chaton, Helmut Cölfen, Keith D Connaghan, Kimberly A Crowley, Ute Curth, Tina Daviter, William L Dean, Ana I Díez, Christine Ebel, Debra M Eckert, Leslie E Eisele, Edward Eisenstein, Patrick England, Carlos Escalante, Jeffrey A Fagan, Robert Fairman, Ron M Finn, Wolfgang Fischle, José García de la Torre, Jayesh Gor, Henning Gustafsson, Damien Hall, Stephen E Harding, José G Hernández Cifre, Andrew B Herr, Elizabeth E Howell, Richard S Isaac, Shu-Chuan Jao, Davis Jose, Soon-Jong Kim, Bashkim Kokona, Jack A Kornblatt, Dalibor Kosek, Elena Krayukhina, Daniel Krzizike, Eric A Kusznir, Hyewon Kwon, Adam Larson, Thomas M Laue, Aline Le Roy, Andrew P Leech, Hauke Lilie, Karolin Luger, Juan R Luque-Ortega, Jia Ma, Carrie A May, Ernest L Maynard, Anna Modrak-Wojcik, Yee-Foong Mok, Norbert Mücke, Luitgard Nagel-Steger, Geeta J Narlikar, Masanori Noda, Amanda Nourse, Tomas Obsil, Chad K Park, Jin-Ku Park, Peter D Pawelek, Erby E Perdue, Stephen J Perkins, Matthew A Perugini, Craig L Peterson, Martin G Peverelli, Grzegorz Piszczek, Gali Prag, Peter E Prevelige, Bertrand D E Raynal, Lenka Rezabkova, Klaus Richter, Alison E Ringel, Rose Rosenberg, Arthur J Rowe, Arne C Rufer, David J Scott, Javier G Seravalli, Alexandra S Solovyova, Renjie Song, David Staunton, Caitlin Stoddard, Katherine Stott, Holger M Strauss, Werner W Streicher, John P Sumida, Sarah G Swygert, Roman H Szczepanowski, Ingrid Tessmer, Ronald T Toth, Ashutosh Tripathy, Susumu Uchiyama, Stephan F W Uebel, Satoru Unzai, Anna Vitlin Gruber, Peter H von Hippel, Christine Wandrey, Szu-Huan Wang, Steven E Weitzel, Beata Wielgus-Kutrowska, Cynthia Wolberger, Martin Wolff, Edward Wright, Yu-Sung Wu, Jacinta M Wubben, and Peter Schuck
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Medicine ,Science - Abstract
Analytical ultracentrifugation (AUC) is a first principles based method to determine absolute sedimentation coefficients and buoyant molar masses of macromolecules and their complexes, reporting on their size and shape in free solution. The purpose of this multi-laboratory study was to establish the precision and accuracy of basic data dimensions in AUC and validate previously proposed calibration techniques. Three kits of AUC cell assemblies containing radial and temperature calibration tools and a bovine serum albumin (BSA) reference sample were shared among 67 laboratories, generating 129 comprehensive data sets. These allowed for an assessment of many parameters of instrument performance, including accuracy of the reported scan time after the start of centrifugation, the accuracy of the temperature calibration, and the accuracy of the radial magnification. The range of sedimentation coefficients obtained for BSA monomer in different instruments and using different optical systems was from 3.655 S to 4.949 S, with a mean and standard deviation of (4.304 ± 0.188) S (4.4%). After the combined application of correction factors derived from the external calibration references for elapsed time, scan velocity, temperature, and radial magnification, the range of s-values was reduced 7-fold with a mean of 4.325 S and a 6-fold reduced standard deviation of ± 0.030 S (0.7%). In addition, the large data set provided an opportunity to determine the instrument-to-instrument variation of the absolute radial positions reported in the scan files, the precision of photometric or refractometric signal magnitudes, and the precision of the calculated apparent molar mass of BSA monomer and the fraction of BSA dimers. These results highlight the necessity and effectiveness of independent calibration of basic AUC data dimensions for reliable quantitative studies.
- Published
- 2015
- Full Text
- View/download PDF
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