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Habermann E, Frommert LM, Ghannam K, Nguyen My L, Gieselmann L, Tober-Lau P, Klotsche J, Arumahandi de Silva AN, Ten Hagen A, Zernicke J, Kurth F, Sander LE, Klein F, Burmester GR, Biesen R, Albach FN. Performance of commercial SARS-CoV-2 wild-type and Omicron BA.1 antibody assays compared with pseudovirus neutralization tests. J Clin Virol 2023; 165:105518. [PMID: 37354690 DOI: 10.1016/j.jcv.2023.105518] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/12/2023] [Accepted: 06/05/2023] [Indexed: 06/26/2023]
Abstract
BACKGROUND Commercially available ELISA-based antibody tests are used to approximate vaccination success against SARS-CoV-2 in at-risk patients, but it is unclear whether they correlate with neutralization of the Omicron variant. METHODS 269 serum samples of a cohort of 44 non-immunosuppressed participants and 65 MTX-treated rheumatic patients taken before and after COVID-19 booster vaccinations were measured using COVID-19 antibody testing systems with wild-type and Omicron BA.1 antigens developed by three different manufacturers (surrogate virus neutralization test cPass, and binding antibody tests QuantiVac and SeraSpot), as well as with a pseudovirus neutralization test (pVNT). The pVNT was considered the gold standard for determining the presence and level of anti-SARS-CoV-2 antibodies. RESULTS All three wild-type ELISAs showed excellent test performance compared with wild-type neutralization in pVNT. However, out of 56 samples without Omicron BA.1 neutralization in pVNT, 71.4% showed positive results in at least one and 28.6% in all three wild-type ELISAs at the manufacturer-defined cut-offs. Omicron ELISAs showed either decreased specificity (57.1% and 55.4% for binding ELISAs) or sensitivity (51.2% in cPass) compared to Omicron neutralization in pVNT. The proportion of any false positive results among all samples decreased from 26.5% before to 3.2% after booster vaccination, however binding antibody test specificities remained below 70%. CONCLUSIONS We found a poorer test performance of new Omicron antibody test systems compared to wild-type tests in detecting neutralizing antibodies against the corresponding SARS-CoV-2 variants. Decisions for booster vaccination or passive immunization of at-risk patients should not be based solely on antibody test results.
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Affiliation(s)
- E Habermann
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - L M Frommert
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - K Ghannam
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - L Nguyen My
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - L Gieselmann
- Laboratory of Experimental Immunology, Institute of Virology, University Hospital Cologne, Cologne, Germany
| | - P Tober-Lau
- Department of Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - J Klotsche
- German Rheumatism Research Center Berlin - a Leibniz Institute (DRFZ), Berlin, Germany
| | - A N Arumahandi de Silva
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - A Ten Hagen
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - J Zernicke
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - F Kurth
- Department of Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - L E Sander
- Department of Infectious Diseases and Respiratory Medicine, Charité - Universitätsmedizin Berlin, Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - F Klein
- Laboratory of Experimental Immunology, Institute of Virology, University Hospital Cologne, Cologne, Germany
| | - G R Burmester
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - R Biesen
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - F N Albach
- Department of Rheumatology and Clinical Immunology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
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Zinggeler M, Schär S, Kurth F. Printed Antifouling Electrodes for Biosensing Applications. ACS Appl Mater Interfaces 2022; 14:56578-56584. [PMID: 36513371 PMCID: PMC9802209 DOI: 10.1021/acsami.2c17557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
Biosensors based on miniaturized, functional electrodes are of high potential for various biosensing applications, especially at the point-of-care setting among others. However, the sensor performance of such electrochemical devices is still strongly limited, especially due to surface fouling in complex sample fluids, such as blood serum. Electrode coatings based on conductive nanomaterials embedded in antifouling matrices offer a promising strategy to overcome this limitation. However, known composite coatings require long (typically >24 h) and complex fabrication processes, which pose a strong barrier for cost-effective mass manufacturing and successful commercialization. Here, we describe a novel polymer/carbon nanotube (CNT) composite coating that can be produced from an ink containing a photoreactive and antifouling copolymer as well as conductive CNTs using fast and highly scalable printing processes. Coatings were prepared on screen-printed electrodes and characterized using cyclic voltammetry (CV) and protein fouling experiments. The coatings offered an electroactive surface area (EASA) comparable to uncoated screen-printed electrodes and retained >90% of initial EASA after 1 h of exposure to concentrated bovine serum albumin solution, while uncoated electrodes decreased to <20% of initial EASA after the same treatment. Utilizing the universal crosslinking reaction of the polymer coating, antibodies against the inflammatory biomarker C-reactive protein (CRP) were photochemically immobilized on the electrodes. Functionalized electrodes were fabricated in <2 h and were successfully used to quantify nanogram-range concentrations of CRP spiked in undiluted human blood serum using a sandwich-immunoassay with electrochemical read-out, demonstrating the high potential of the platform for biosensing applications.
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Zuncheddu D, Della Bella E, Schwab A, Petta D, Rocchitta G, Generelli S, Kurth F, Parrilli A, Verrier S, Rau JV, Fosca M, Maioli M, Serra PA, Alini M, Redl H, Grad S, Basoli V. Author Correction: Quality control methods in musculoskeletal tissue engineering: from imaging to biosensors. Bone Res 2021; 9:51. [PMID: 34963684 PMCID: PMC8714806 DOI: 10.1038/s41413-021-00174-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Daniele Zuncheddu
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Elena Della Bella
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Andrea Schwab
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Dalila Petta
- Regenerative Medicine Technologies Lab, Ente Ospedaliero Cantonale (EOC), Via Tesserete 46, 6900, Lugano, Switzerland
| | - Gaia Rocchitta
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Viale San Pietro 43/b, 07100, Sassari, Italy
| | - Silvia Generelli
- Centre Suisse d'Electronique et de Microtechnique, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Felix Kurth
- Centre Suisse d'Electronique et de Microtechnique, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Annapaola Parrilli
- Center for X-ray Analytics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland
| | - Sophie Verrier
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Julietta V Rau
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche (ISM-CNR), Via del Fosso del Cavaliere, 100 - 00133, Rome, Italy.,Sechenov First Moscow State Medical University, Trubetskaya 8, build. 2, 119991, Moscow, Russian Federation
| | - Marco Fosca
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche (ISM-CNR), Via del Fosso del Cavaliere, 100 - 00133, Rome, Italy
| | - Margherita Maioli
- Department of Biomedical Sciences, University of Sassari, Viale San Pietro 43/b, 07100, Sassari, Italy
| | - Pier Andrea Serra
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Viale San Pietro 43/b, 07100, Sassari, Italy
| | - Mauro Alini
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland
| | - Heinz Redl
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology in AUVA trauma research center, Donaueschingenstraße 13, 1200, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Sibylle Grad
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland.
| | - Valentina Basoli
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland.
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Tang Y, Gao H, Kurth F, Burr L, Petropoulos K, Migliorelli D, Guenat OT, Generelli S. Nanocellulose aerogel inserts for quantitative lateral flow immunoassays. Biosens Bioelectron 2021; 192:113491. [PMID: 34271399 DOI: 10.1016/j.bios.2021.113491] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/31/2021] [Accepted: 07/06/2021] [Indexed: 02/01/2023]
Abstract
The Lateral Flow Immuno Assay (LFIA) is a well-established technique that provides immediate results without high-cost laboratory equipment and technical skills from the users. However, conventional colorimetric LFIA strips suffer from high limits of detection, mainly due to the analysis of a limited sample volume, short reaction time between the target analyte and the conjugation molecules, and a weak optical signal. Thus, LFIAs are mainly employed as a medical diagnostic tool for qualitative and semi/quantitative detection, respectively. We applied a novel cellulose nanofiber (CNF) aerogel material incorporated into LFIA strips to increase the sample flow time, which in turn extends the binding interactions between the analyte of interest and the detection antibody, thus improving the limit of detection (LOD). Compared to a conventional LFIA strip, the longer sample flow time in the aerogel modified LFIA strips improved the LOD for the detection of mouse IgG in a buffer solution by a 1000-fold. The accomplished LOD (0.01 ng/mL) even outperformed specifications of a commercial ELISA kit by a factor of 10, and the CNF aerogel assisted LFIA was successfully applied to detect IgG in human serum with a LOD of 0.72 ng/mL. Next to the improved LOD, the aerogel assisted LFIA could quantify IgG samples in buffer and human serum in the concentration ranges of 0.17 ng/mL - 100 ng/mL (in buffer) and 4.6 ng/mL - 100 ng/mL (in human serum). The presented solution thus poses a unique potential to transform lateral flow assays into highly sensitive, fully quantitative point-of-care diagnostics.
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Affiliation(s)
- Ye Tang
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland; University of Bern, ARTORG Center for Biomedical Engineering Research, Organs-on-Chip Technologies, Murtenstrasse 50, 3008, Bern, Switzerland
| | - Hui Gao
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Felix Kurth
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Loïc Burr
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Konstantinos Petropoulos
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Davide Migliorelli
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Olivier T Guenat
- University of Bern, ARTORG Center for Biomedical Engineering Research, Organs-on-Chip Technologies, Murtenstrasse 50, 3008, Bern, Switzerland
| | - Silvia Generelli
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland.
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Tang Y, Petropoulos K, Kurth F, Gao H, Migliorelli D, Guenat O, Generelli S. Screen-Printed Glucose Sensors Modified with Cellulose Nanocrystals (CNCs) for Cell Culture Monitoring. Biosensors (Basel) 2020; 10:bios10090125. [PMID: 32933204 PMCID: PMC7557574 DOI: 10.3390/bios10090125] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/10/2020] [Accepted: 09/11/2020] [Indexed: 01/03/2023]
Abstract
Glucose sensors are potentially useful tools for monitoring the glucose concentration in cell culture medium. Here, we present a new, low-cost, and reproducible sensor based on a cellulose-based material, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized-cellulose nanocrystals (CNCs). This novel biocompatible and inert nanomaterial is employed as a polymeric matrix to immobilize and stabilize glucose oxidase in the fabrication of a reproducible, operationally stable, highly selective, cost-effective, screen-printed glucose sensor. The sensors have a linear range of 0.1–2 mM (R2 = 0.999) and a sensitivity of 5.7 ± 0.3 µA cm−2∙mM−1. The limit of detection is 0.004 mM, and the limit of quantification is 0.015 mM. The sensor maintains 92.3 % of the initial current response after 30 consecutive measurements in a 1 mM standard glucose solution, and has a shelf life of 1 month while maintaining high selectivity. We demonstrate the practical application of the sensor by monitoring the glucose consumption of a fibroblast cell culture over the course of several days.
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Affiliation(s)
- Ye Tang
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
- Organs-on-Chip Technologies, ARTORG Center for Biomedical Engineering Research, University of Bern, Murtenstrasse 50, 3008 Bern, Switzerland;
| | - Konstantinos Petropoulos
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
| | - Felix Kurth
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
| | - Hui Gao
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
| | - Davide Migliorelli
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
| | - Olivier Guenat
- Organs-on-Chip Technologies, ARTORG Center for Biomedical Engineering Research, University of Bern, Murtenstrasse 50, 3008 Bern, Switzerland;
| | - Silvia Generelli
- Swiss Center for Electronics and Microtechnology (CSEM, Landquart), Bahnhofstrasse 1, 7302 Landquart, Switzerland; (Y.T.); (K.P.); (F.K.); (H.G.); (D.M.)
- Correspondence: ; Tel.: +41-81-307-8139
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Kurth F, Tai YK, Parate D, van Oostrum M, Schmid YRF, Toh SJ, Yap JLY, Wollscheid B, Othman A, Dittrich PS, Franco-Obregón A. Cell-Derived Vesicles as TRPC1 Channel Delivery Systems for the Recovery of Cellular Respiratory and Proliferative Capacities. ACTA ACUST UNITED AC 2020; 4:e2000146. [PMID: 32875708 DOI: 10.1002/adbi.202000146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/28/2020] [Indexed: 11/07/2022]
Abstract
Pulsed electromagnetic fields (PEMFs) are capable of specifically activating a TRPC1-mitochondrial axis underlying cell expansion and mitohormetic survival adaptations. This study characterizes cell-derived vesicles (CDVs) generated from C2C12 murine myoblasts and shows that they are equipped with the sufficient molecular machinery to confer mitochondrial respiratory capacity and associated proliferative responses upon their fusion with recipient cells. CDVs derived from wild type C2C12 myoblasts include the cation-permeable transient receptor potential (TRP) channels, TRPC1 and TRPA1, and directly respond to PEMF exposure with TRPC1-mediated calcium entry. By contrast, CDVs derived from C2C12 muscle cells in which TRPC1 has been genetically knocked-down using CRISPR/Cas9 genome editing, do not. Wild type C2C12-derived CDVs are also capable of restoring PEMF-induced proliferative and mitochondrial activation in two C2C12-derived TRPC1 knockdown clonal cell lines in accordance to their endogenous degree of TRPC1 suppression. C2C12 wild type CDVs respond to menthol with calcium entry and accumulation, likewise verifying TRPA1 functional gating and further corroborating compartmental integrity. Proteomic and lipidomic analyses confirm the surface membrane origin of the CDVs providing an initial indication of the minimal cellular machinery required to recover mitochondrial function. CDVs hence possess the potential of restoring respiratory and proliferative capacities to senescent cells and tissues.
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Affiliation(s)
- Felix Kurth
- Department of Biosystems Science and Engineering, Bioanalytics Group, ETH Zurich, Mattenstrasse 26, Basel, 4058, Switzerland
| | - Yee Kit Tai
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,BioIonic Currents Electromagnetic Pulsing Systems Laboratory, BICEPS, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore
| | - Dinesh Parate
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,BioIonic Currents Electromagnetic Pulsing Systems Laboratory, BICEPS, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore
| | - Marc van Oostrum
- Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zurich, Otto-Stern-Weg 3, Zurich, 8093, Switzerland
| | - Yannick R F Schmid
- Department of Biosystems Science and Engineering, Bioanalytics Group, ETH Zurich, Mattenstrasse 26, Basel, 4058, Switzerland
| | - Shi Jie Toh
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,BioIonic Currents Electromagnetic Pulsing Systems Laboratory, BICEPS, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore
| | - Jasmine Lye Yee Yap
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,BioIonic Currents Electromagnetic Pulsing Systems Laboratory, BICEPS, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore
| | - Bernd Wollscheid
- Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zurich, Otto-Stern-Weg 3, Zurich, 8093, Switzerland
| | - Alaa Othman
- Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zurich, Otto-Stern-Weg 3, Zurich, 8093, Switzerland.,Institute of Molecular Systems Biology, Department of Biology, ETH Zurich, Zurich, 8093, Switzerland.,Institute for Clinical Chemistry, University Hospital Zurich, Zurich, 8091, Switzerland
| | - Petra S Dittrich
- Department of Biosystems Science and Engineering, Bioanalytics Group, ETH Zurich, Mattenstrasse 26, Basel, 4058, Switzerland
| | - Alfredo Franco-Obregón
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,BioIonic Currents Electromagnetic Pulsing Systems Laboratory, BICEPS, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore.,Institute for Health Innovation & Technology, iHealthtech, National University of Singapore, MD6, 14 Medical Drive, Singapore, 117599, Singapore
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Grogg M, Hilvert D, Ebert MO, Beck AK, Seebach D, Kurth F, Dittrich PS, Sparr C, Wittlin S, Rottmann M, Mäser P. Cell Penetration, Herbicidal Activity, and in-vivo-Toxicity of Oligo-Arginine Derivatives and of Novel Guanidinium-Rich Compounds Derived from the Biopolymer Cyanophycin. Helv Chim Acta 2018; 101. [PMID: 30905972 DOI: 10.1002/hlca.201800112] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Oligo-arginines are thoroughly studied cell-penetrating peptides (CPPs, Figures 1 and 2). Previous in-vitro investigations with the octaarginine salt of the phosphonate fosmidomycin (herbicide and anti-malaria drug) have shown a 40-fold parasitaemia inhibition with P. falciparum, compared to fosmidomycin alone (Figure 3). We have now tested this salt, as well as the corresponding phosphinate salt of the herbicide glufosinate, for herbicidal activity with whole plants by spray application, hoping for increased activities, i.e. decreased doses. However, both salts showed low herbicidal activity, indicating poor foliar uptake (Table 1). Another pronounced difference between in-vitro and in-vivo activity was demonstrated with various cell-penetrating octaarginine salts of fosmidomycin: intravenous injection to mice caused exitus of the animals within minutes, even at doses as low as 1.4 μmol/kg (Table 2). The results show that use of CPPs for drug delivery, for instance to cancer cells and tissues, must be considered with due care. The biopolymer cyanophycin is a poly-aspartic acid containing argininylated side chains (Figure 4); its building block is the dipeptide H-βAsp-αArg-OH (H-Adp-OH). To test and compare the biological properties with those of octaarginines we synthesized Adp8-derivatives (Figure 5). Intravenouse injection of H-Adp8-NH2 into the tail vein of mice with doses as high as 45 μmol/kg causes no symptoms whatsoever (Table 3), but H-Adp8-NH2 is not cell penetrating (HEK293 and MCF-7 cells, Figure 6). On the other hand, the fluorescently labeled octamers FAM-(Adp(OMe))8-NH2 and FAM-(Adp(NMe2))8-NH2 with ester and amide groups in the side chains exhibit mediocre to high cell-wall permeability (Figure 6), and are toxic (Table 3). Possible reasons for this behavior are discussed (Figure 7) and corresponding NMR spectra are presented (Figure 8).
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Affiliation(s)
- Marcel Grogg
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Donald Hilvert
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Marc-Olivier Ebert
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Albert K Beck
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Dieter Seebach
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Felix Kurth
- Department of Biosystems Science and Engineering, ETH Zürich, BSD H 368, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Petra S Dittrich
- Department of Biosystems Science and Engineering, ETH Zürich, BSD H 368, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Christof Sparr
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
| | - Sergio Wittlin
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4051 Basel, Switzerland
| | - Matthias Rottmann
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4051 Basel, Switzerland
| | - Pascal Mäser
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4051 Basel, Switzerland
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8
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Kurth F, Dittrich PS, Walde P, Seebach D. Influence of the Membrane Dye R18 and of DMSO on Cell Penetration of Guanidinium-Rich Peptides. Chem Biodivers 2018; 15:e1800302. [PMID: 30074284 PMCID: PMC6387783 DOI: 10.1002/cbdv.201800302] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 07/23/2018] [Indexed: 01/26/2023]
Abstract
A quantitative analysis by confocal fluorescence microscopy of the entry into HEK293 and MCF-7 cells by fluorescein-labeled octaarginine (1) and by three octa-Adp derivatives (2 - 4, octamers of the β-Asp-Arg-dipeptide, derived from the biopolymer cyanophycin) is described, including the effects of the membrane dye R18 and of DMSO on cell penetration.
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Affiliation(s)
- Felix Kurth
- Department of Biosystems Science and Engineering, ETH Zürich, BSD H 368, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Petra S. Dittrich
- Department of Biosystems Science and Engineering, ETH Zürich, BSD H 368, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Peter Walde
- Departement Materialwissenschaft, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 5, CH-8093 Zürich, Switzerland
| | - Dieter Seebach
- Laboratorium für Organische Chemie, Departement Chemie und Angewandte Biowissenschaften, ETH-Zürich, Hönggerberg HCI, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
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Armbrecht L, Gabernet G, Kurth F, Hiss JA, Schneider G, Dittrich PS. Characterisation of anticancer peptides at the single-cell level. Lab Chip 2017; 17:2933-2940. [PMID: 28736788 PMCID: PMC6440648 DOI: 10.1039/c7lc00505a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The development of efficacious anticancer therapeutics is difficult due to the heterogeneity of the cellular response to chemotherapy. Anticancer peptides (ACPs) are promising drug candidates that have been shown to be active against a range of cancer cells. However, few ACP studies focus on tumour single-cell heterogeneities. In order to address this need, we developed a microfluidic device and an imaging procedure that enable the capture, monitoring, and analysis of several hundred single cells for the study of drug response. MCF-7 human breast adenocarcinoma cells were captured in hydrodynamic traps and isolated in individual microchambers of less than 100 pL volume. With pneumatic valves, different sets of microchambers were actuated to expose the cells to various drugs. Here, the effect of three membranolytic ACPs - melittin, aurein 1.2 and aurein 2.2 - was investigated by monitoring the efflux of calcein from single MCF-7 cells. The loss of membrane integrity was observed with two different strategies that allow either focusing on one cell for mechanistic studies or parallel analysis of hundreds of individual cells. In general, the device is applicable to the analysis of the effect of various drugs on a large number of different cell types. The platform will enable us in the future to determine the origin of heterogeneous responses on pharmacological substances like ACPs within cell populations by combining it with other on-chip analytical methods.
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Affiliation(s)
- L Armbrecht
- Department of Biosystems Science and Engineering, ETH Zurich, Switzerland.
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10
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Grinenko V, Iida K, Kurth F, Efremov DV, Drechsler SL, Cherniavskii I, Morozov I, Hänisch J, Förster T, Tarantini C, Jaroszynski J, Maiorov B, Jaime M, Yamamoto A, Nakamura I, Fujimoto R, Hatano T, Ikuta H, Hühne R. Selective mass enhancement close to the quantum critical point in BaFe 2(As 1-x P x ) 2. Sci Rep 2017; 7:4589. [PMID: 28676703 PMCID: PMC5496881 DOI: 10.1038/s41598-017-04724-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/15/2017] [Indexed: 11/09/2022] Open
Abstract
A quantum critical point (QCP) is currently being conjectured for the BaFe2(As1-x P x )2 system at the critical value x c ≈ 0.3. In the proximity of a QCP, all thermodynamic and transport properties are expected to scale with a single characteristic energy, given by the quantum fluctuations. Such a universal behavior has not, however, been found in the superconducting upper critical field H c2. Here we report H c2 data for epitaxial thin films extracted from the electrical resistance measured in very high magnetic fields up to 67 Tesla. Using a multi-band analysis we find that H c2 is sensitive to the QCP, implying a significant charge carrier effective mass enhancement at the doping-induced QCP that is essentially band-dependent. Our results point to two qualitatively different groups of electrons in BaFe2(As1-x P x )2. The first one (possibly associated to hot spots or whole Fermi sheets) has a strong mass enhancement at the QCP, and the second one is insensitive to the QCP. The observed duality could also be present in many other quantum critical systems.
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Affiliation(s)
- V Grinenko
- Institute for Solid State Physics, TU Dresden, 01069, Dresden, Germany. .,IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany. .,Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
| | - K Iida
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany.,Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - F Kurth
- Institute for Solid State Physics, TU Dresden, 01069, Dresden, Germany.,IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany
| | - D V Efremov
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany
| | - S-L Drechsler
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany
| | - I Cherniavskii
- Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow, 119991, Russian Federation
| | - I Morozov
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany.,Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow, 119991, Russian Federation
| | - J Hänisch
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany.,Karlsruhe Institute of Technology, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - T Förster
- Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01314, Dresden, Germany
| | - C Tarantini
- NHMFL, Florida State University, Tallahassee, FL, 32310, USA
| | - J Jaroszynski
- NHMFL, Florida State University, Tallahassee, FL, 32310, USA
| | - B Maiorov
- MPA-CMMS, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - M Jaime
- MPA-CMMS, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - A Yamamoto
- Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - I Nakamura
- Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - R Fujimoto
- Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - T Hatano
- Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - H Ikuta
- Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - R Hühne
- IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany
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11
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Luders E, Kurth F, Pigdon L, Conti-Ramsden G, Reilly S, Morgan A. Atypical Callosal Morphology in Developmental Language Disorder. Eur Psychiatry 2017. [DOI: 10.1016/j.eurpsy.2017.01.1020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
IntroductionDevelopmental language disorder (DLD) is common, yet the neurobiology of DLD is poorly understood. A key hypothesis suggests atypical functional lateralization of language, which might be accompanied structurally by a deficit in inter-hemispheric connectivity of language-related regions. Indeed, aberrations of the corpus callosum have been associated with language deficits in children with frank neurological lesions and/or born pre-term. In contrast, studies examining the corpus callosum in children with DLD remain elusive.ObjectiveWe aimed to expand this largely understudied field by comparing callosal morphology between 17 children with DLD and 17 typically developing children carefully matched for sex and age.MethodsWe analyzed high-resolution structural magnetic resonance imaging data applying a well-validated computational approach, which captures the thickness of the corpus callosum with a high regional specificity at 100 equidistant points.ResultsAs shown in Fig. 1, we observed a significantly thinner corpus callosum, particularly in the splenium, in children with DLD compared to typically developing controls (DLD < CTL).ConclusionsThese findings indicating pronounced aberrations in the brain's largest whiter matter tract make an important contribution to an understudied field of research and support the theory that DLD is accompanied by atypical lateralization of language function.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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12
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Laiwalla AN, Kurth F, Leu K, Liou R, Pamplona J, Ooi YC, Salamon N, Ellingson BM, Gonzalez NR. Evaluation of Encephaloduroarteriosynangiosis Efficacy Using Probabilistic Independent Component Analysis Applied to Dynamic Susceptibility Contrast Perfusion MRI. AJNR Am J Neuroradiol 2017; 38:507-514. [PMID: 28104642 DOI: 10.3174/ajnr.a5041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 10/17/2016] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Indirect cerebral revascularization has been successfully used for treatment in Moyamoya disease and symptomatic intracranial atherosclerosis. While angiographic neovascularization has been demonstrated after surgery, measurements of local tissue perfusion are scarce and may not reflect the reported successful clinical outcomes. We investigated probabilistic independent component analysis and conventional perfusion parameters from DSC-MR imaging to measure postsurgical changes in tissue perfusion. MATERIALS AND METHODS In this prospective study, 13 patients underwent unilateral indirect cerebral revascularization and DSC-MR imaging before and after surgery. Conventional perfusion parameters (relative cerebral blood volume, relative cerebral blood flow, and TTP) and probabilistic independent components that reflect the relative contributions of DSC signals consistent with arterial, capillary, and venous hemodynamics were calculated and examined for significant changes after surgery. Results were compared with postsurgical DSA studies to determine whether changes in tissue perfusion were due to postsurgical neovascularization. RESULTS Before surgery, tissue within the affected hemisphere demonstrated a high probability for hemodynamics consistent with venous flow and a low probability for hemodynamics consistent with arterial flow, whereas the contralateral control hemisphere demonstrated the reverse. Consistent with symptomatic improvement, the probability for venous hemodynamics within the affected hemisphere decreased with time after surgery (P = .002). No other perfusion parameters demonstrated this association. Postsurgical DSA revealed an association between an increased preoperative venous probability in the symptomatic hemisphere and neovascularization after surgery. CONCLUSIONS Probabilistic independent component analysis yielded sensitive measurements of changes in local tissue perfusion that may be associated with newly formed vasculature after indirect cerebral revascularization surgery.
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Affiliation(s)
- A N Laiwalla
- From the Departments of Neurosurgery (A.N.L., Y.C.O.)
| | - F Kurth
- Department of Neurosurgery (F.K., R.L., N.R.G.), Cedars Sinai Medical Center, Los Angeles, California
| | - K Leu
- Radiology (K.L., J.P., N.S., B.M.E.), David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - R Liou
- Department of Neurosurgery (F.K., R.L., N.R.G.), Cedars Sinai Medical Center, Los Angeles, California
| | - J Pamplona
- Radiology (K.L., J.P., N.S., B.M.E.), David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - Y C Ooi
- From the Departments of Neurosurgery (A.N.L., Y.C.O.)
| | - N Salamon
- Radiology (K.L., J.P., N.S., B.M.E.), David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - B M Ellingson
- Radiology (K.L., J.P., N.S., B.M.E.), David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California
| | - N R Gonzalez
- Department of Neurosurgery (F.K., R.L., N.R.G.), Cedars Sinai Medical Center, Los Angeles, California.
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Abstract
Microfluidic devices capable of manipulating and guiding small fluid volumes open new methodical approaches in the fields of biology, pharmacy, and medicine. They have already proven their extraordinary value for cell analysis. The emergence of microfluidic platforms has paved the way to novel analytical strategies for the positioning, treatment and observation of living cells, for the creation of chemically defined liquid environments, and for tailoring biomechanical or physical conditions in small volumes. In this article, we particularly focus on two complementary approaches: (i) the isolation of cells in small chambers defined by microchannels and integrated valves and (ii) the encapsulation of cells in microdroplets. We review the advantages and limitations of both approaches and discuss their potential for single-cell analysis and related fields. Our intention is also to give a recommendation on which platform is most appropriate for a new question, i.e., a guideline to choose the most suitable platform.
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Affiliation(s)
- D Hümmer
- ETH Zurich - Department of Biosystems Science Engineering, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland.
| | - F Kurth
- ETH Zurich - Department of Biosystems Science Engineering, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland.
| | - N Naredi-Rainer
- ETH Zurich - Department of Biosystems Science Engineering, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland.
| | - P S Dittrich
- ETH Zurich - Department of Biosystems Science Engineering, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland.
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14
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Kurth F, Franco-Obregón A, Bärtschi CA, Dittrich PS. An adaptable stage perfusion incubator for the controlled cultivation of C2C12 myoblasts. Analyst 2015; 140:127-33. [PMID: 25368875 DOI: 10.1039/c4an01758g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Here we present a stage perfusion incubation system that allows for the cultivation of mammalian cells within PDMS microfluidic devices for long-term microscopic examination and analysis. The custom-built stage perfusion incubator is adaptable to any x-y microscope stage and is enabled for temperature, gas and humidity control as well as equipped with chip and tubing holder. The applied double-layered microfluidic chip allows the predetermined positioning and concentration of cells while the gas permeable PDMS material facilitates pH control via CO2 levels throughout the chip. We demonstrate the functionality of this system by culturing C2C12 murine myoblasts in buffer free medium within its confines for up to 26 hours. We moreover demonstrated the system's compatibility with various chip configurations, other cells lines (HEK-293 cells) and for longer-term culturing. The cost-efficient system are applicable for any type of PDMS-based cell culture system. Detailed technical drawings and specification to reproduce this perfusion incubation system is provided in the ESI.
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Affiliation(s)
- Felix Kurth
- ETH Zurich, Department of Chemistry and Applied Biosciences, Department of Biosystems Science and Engineering, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland.
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15
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Kurth F, Franco-Obregón A, Casarosa M, Küster SK, Wuertz-Kozak K, Dittrich PS. Transient receptor potential vanilloid 2-mediated shear-stress responses in C2C12 myoblasts are regulated by serum and extracellular matrix. FASEB J 2015. [PMID: 26207028 DOI: 10.1096/fj.15-275396] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The developmental sensitivity of skeletal muscle to mechanical forces is unparalleled in other tissues. Calcium entry via reputedly mechanosensitive transient receptor potential (TRP) channel classes has been shown to play an essential role in both the early proliferative stage and subsequent differentiation of skeletal muscle myoblasts, particularly TRP canonical (TRPC) 1 and TRP vanilloid (TRPV) 2. Here we show that C2C12 murine myoblasts respond to fluid flow-induced shear stress with increments in cytosolic calcium that are largely initiated by the mechanosensitive opening of TRPV2 channels. Response to fluid flow was augmented by growth in low extracellular serum concentration (5 vs. 20% fetal bovine serum) by greater than 9-fold and at 18 h in culture, coincident with the greatest TRPV2 channel expression under identical conditions (P < 0.02). Fluid flow responses were also enhanced by substrate functionalization with laminin, rather than with fibronectin, agreeing with previous findings that the gating of TRPV2 is facilitated by laminin. Fluid flow-induced calcium increments were blocked by ruthenium red (27%) and SKF-96365 (38%), whereas they were unaltered by 2-aminoethoxydiphenyl borate, further corroborating that TRPV2 channels play a predominant role in fluid flow mechanosensitivity over that of TRPC1 and TRP melastatin (TRPM) 7.
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Affiliation(s)
- Felix Kurth
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
| | - Alfredo Franco-Obregón
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
| | - Marco Casarosa
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
| | - Simon K Küster
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
| | - Karin Wuertz-Kozak
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
| | - Petra S Dittrich
- *Department of Biosystems and Science Engineering and Institute for Biomechanics, Eidgenössische Technische Hochschule Zürich, Switzerland; Department of Surgery, Yong Loo Lin School of Medicine, and Department of Physiology, National University of Singapore, Singapore; and National University Hospital Sports Centre, Singapore
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16
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Stratz S, Eyer K, Kurth F, Dittrich PS. On-chip enzyme quantification of single Escherichia coli bacteria by immunoassay-based analysis. Anal Chem 2014; 86:12375-81. [PMID: 25409480 DOI: 10.1021/ac503766d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Individual bacteria of an isogenic population can differ significantly in their phenotypic characteristics. This cellular heterogeneity is thought to increase the adaptivity to environmental changes on a population level. Analytical methods for single-bacteria analyses are essential to reveal the different factors that may contribute to this cellular heterogeneity, among them the stochastic gene expression, cell cycle stages and cell aging. Although promising concepts for the analysis of single mammalian cells based on microsystems technology were recently developed, platforms suitable for proteomic analyses of microbial cells are by far more challenging. Here, we present a microfluidic device optimized for the analysis of single Escherichia coli bacteria. Individual bacteria are captured in a trap and isolated in a volume of only 155 pL. In combination with an immunoassay-based analysis of the cell lysate, the platform allowed the selective and sensitive analysis of intracellular enzymes. The limit of detection of the developed protocol was found to be 200 enzymes. Using this platform, we could investigate the levels of β-galactosidase in cells grown under different nutrient conditions. We successfully determined the enzyme copy numbers in cells cultured in defined medium (3517 ± 1578) and in complex medium (4710 ± 2643), and verified the down-regulation of expression in medium that contained only glucose as carbon source. The strong variations we found for individual bacteria confirm the phenotype heterogeneity. The capability to quantify proteins and other molecules in single bacterial lysates is encouraging to use the new analysis platform in future proteomics studies of isogenic bacteria populations.
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Affiliation(s)
- Simone Stratz
- Department of Chemistry and Applied Biosciences, ETH Zurich , CH-8093 Zürich, Switzerland
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17
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Barone C, Romeo F, Pagano S, Adamo M, Nappi C, Sarnelli E, Kurth F, Iida K. Probing transport mechanisms of BaFe₂As₂ superconducting films and grain boundary junctions by noise spectroscopy. Sci Rep 2014; 4:6163. [PMID: 25145385 PMCID: PMC4141261 DOI: 10.1038/srep06163] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/31/2014] [Indexed: 11/09/2022] Open
Abstract
An important step forward for the understanding of high-temperature superconductivity has been the discovery of iron-based superconductors. Among these compounds, iron pnictides could be used for high-field magnet applications, resulting more advantageous over conventional superconductors, due to a high upper critical field as well as its low anisotropy at low temperatures. However, the principal obstacle in fabricating high quality superconducting wires and tapes is given by grain boundaries. In order to study these effects, the dc transport and voltage-noise properties of Co-doped BaFe₂As₂ superconducting films with artificial grain boundary junctions have been investigated. A specific procedure allows the separation of the film noise from that of the junction. While the former shows a standard 1/f behaviour, the latter is characterized by an unconventional temperature-dependent multi-Lorentzian voltage-spectral density. Moreover, below the film superconducting critical temperature, a peculiar noise spectrum is found for the grain boundary junction. Possible theoretical interpretation of these phenomena is proposed.
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Affiliation(s)
- C. Barone
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - F. Romeo
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - S. Pagano
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - M. Adamo
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - C. Nappi
- CNR-SPIN Napoli, Via Campi Flegrei 34, I-80078 Pozzuoli, Napoli, Italy
| | - E. Sarnelli
- CNR-SPIN Napoli, Via Campi Flegrei 34, I-80078 Pozzuoli, Napoli, Italy
| | - F. Kurth
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, PO Box 270116, 01171 Dresden, Germany
| | - K. Iida
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, PO Box 270116, 01171 Dresden, Germany
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Langner R, Sternkopf MA, Kellermann TS, Grefkes C, Kurth F, Schneider F, Zilles K, Eickhoff SB. Visual working memory for action: Evidence for using motor representations in encoding visuo-spatial stimulus sequences. KLIN NEUROPHYSIOL 2014. [DOI: 10.1055/s-0034-1371298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guo C, Kurth F, Zhou J, Mayer E, Eickhoff S, Kramer J, Seeley W. One-Year Test-Retest Reliability of Intrinsic Connectivity Network fMRI in Older Adults (P03.082). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p03.082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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20
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Zhang J, OˈˈNeill J, Thomas S, Hudkins M, Yee V, Ly R, Kurth F, Doss A, Loo S, Posse S, Alger J, Levitt J. SU-E-I-119: Short-TE 2D Proton Echo Planar Spectroscopic Imaging in Adolescents with Attention-Deficit Hyperactivity Disorder. Med Phys 2011. [DOI: 10.1118/1.3611693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Bzdok D, Langner R, Caspers S, Kurth F, Habel U, Zilles K, Laird A, Eickhoff SB. ALE meta-analysis on facial judgments of trustworthiness and attractiveness. Brain Struct Funct 2010; 215:209-23. [PMID: 20978908 DOI: 10.1007/s00429-010-0287-4] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Accepted: 10/13/2010] [Indexed: 10/18/2022]
Abstract
Faces convey a multitude of information in social interaction, among which are trustworthiness and attractiveness. Humans process and evaluate these two dimensions very quickly due to their great adaptive importance. Trustworthiness evaluation is crucial for modulating behavior toward strangers; attractiveness evaluation is a crucial factor for mate selection, possibly providing cues for reproductive success. As both dimensions rapidly guide social behavior, this study tests the hypothesis that both judgments may be subserved by overlapping brain networks. To this end, we conducted an activation likelihood estimation meta-analysis on 16 functional magnetic resonance imaging studies pertaining to facial judgments of trustworthiness and attractiveness. Throughout combined, individual, and conjunction analyses on those two facial judgments, we observed consistent maxima in the amygdala which corroborates our initial hypothesis. This finding supports the contemporary paradigm shift extending the amygdala's role from dominantly processing negative emotional stimuli to processing socially relevant ones. We speculate that the amygdala filters sensory information with evolutionarily conserved relevance. Our data suggest that such a role includes not only "fight-or-flight" decisions but also social behaviors with longer term pay-off schedules, e.g., trustworthiness and attractiveness evaluation.
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Affiliation(s)
- D Bzdok
- Department of Psychiatry and Psychotherapy, RWTH Aachen University, Aachen, Germany
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22
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Bardeli R, Wolff D, Kurth F, Koch M, Tauchert KH, Frommolt KH. Detecting bird sounds in a complex acoustic environment and application to bioacoustic monitoring. Pattern Recognit Lett 2010. [DOI: 10.1016/j.patrec.2009.09.014] [Citation(s) in RCA: 186] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kurth F, Zinnow F, Prakapenia A, Winkler S, Dietl S, Rüdiger M, Burkhardt W. Elektrische Quadranten-Impedanzmessung zur Bestimmung von Tidalvolumina bei neugeborenen Schweinen. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1261390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Eickhoff S, Nickl-Jockschat T, Kurth F, Laird A, Fox P. New approaches for coordinate-based meta-analysis of functional neuroimaging studies. KLIN NEUROPHYSIOL 2010. [DOI: 10.1055/s-0030-1250877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Affiliation(s)
- Hendrik Kortmann
- ISAS Dortmund, Bunsen-Kirchhoff-Str. 11, D-44139 Dortmund, Germany
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27
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Kurth F, Zilles K, Wang L, Dafotakis M, Amunts K, Eickhoff S. Organisation of Sensorimotor Integration during Active Touch: an fMRI study. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71277-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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28
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Kossakowski C, Schleicher A, Mohlberg H, Eickhoff S, Kurth F, Ng Y, Zilles K, Amunts K. Cytoarchitectonic mapping of human middle insula. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71878-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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29
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Kurth F, Schumann C, Blank L, Schmid A, Manz A, Dittrich P. Bilayer microfluidic chip for diffusion-controlled activation of yeast species. J Chromatogr A 2008; 1206:77-82. [DOI: 10.1016/j.chroma.2008.07.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Revised: 07/01/2008] [Accepted: 07/11/2008] [Indexed: 02/04/2023]
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30
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Kurth F, Gudjons T, Hilbert B, Reisinger T, Werth G, M�rtensson-Pendrill AM. Doppler free ?dark resonances? for hyperfine measurements and isotope shifts in Ca+ isotopes in a Paul trap. ACTA ACUST UNITED AC 1995. [DOI: 10.1007/bf01437567] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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31
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Arbes F, Benzing M, Gudjons T, Kurth F, Werth G. Precise determination of the ground state hyperfine structure splitting of43Ca II. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf01426573] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Arbes F, Gudjons T, Kurth F, Werth G, Marin F, Inguscio M. Lifetime measurements of the 3D3/2 and 3D5/2 metastable states in CaII. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf01437293] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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