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Cottet J, Kehren A, Lasli S, van Lintel H, Buret F, Frénéa-Robin M, Renaud P. Dielectrophoresis-assisted creation of cell aggregates under flow conditions using planar electrodes. Electrophoresis 2019; 40:1498-1509. [PMID: 30706961 DOI: 10.1002/elps.201800435] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 01/20/2019] [Accepted: 01/30/2019] [Indexed: 12/13/2022]
Abstract
We present a microfluidic platform allowing dielectrophoresis-assisted formation of cell aggregates of controlled size and composition under flow conditions. When specific experimental conditions are met, negative dielectrophoresis allows efficient concentration of cells towards electric field minima and subsequent aggregation. This bottom-up assembly strategy offers several advantages with respect to the targeted application: first, dielectrophoresis offers precise control of spatial cell organization, which can be adjusted by optimizing electrode design. Then, it could contribute to accelerate the establishment of cell-cell interactions by favoring close contact between neighboring cells. The trapping geometry of our chip is composed of eight electrodes arranged in a circle. Several parameters have been tested in simulations to find the best configurations for trapping in flow. Those configurations have been tested experimentally with both polystyrene beads and human embryonic kidney cells. The final design and experimental setup have been optimized to trap cells and release the created aggregates on demand.
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Affiliation(s)
- Jonathan Cottet
- Univ Lyon, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, CNRS, Ampère, Ecully, France.,École Polytechnique Fédérale de Lausanne, EPFL-STI-IMT-LMIS4, Station 17, CH-1015, Lausanne, Switzerland
| | - Alexandre Kehren
- École Polytechnique Fédérale de Lausanne, EPFL-STI-IMT-LMIS4, Station 17, CH-1015, Lausanne, Switzerland
| | - Soufian Lasli
- École Polytechnique Fédérale de Lausanne, EPFL-STI-IMT-LMIS4, Station 17, CH-1015, Lausanne, Switzerland
| | - Harald van Lintel
- École Polytechnique Fédérale de Lausanne, EPFL-STI-IMT-LMIS4, Station 17, CH-1015, Lausanne, Switzerland
| | - François Buret
- Univ Lyon, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, CNRS, Ampère, Ecully, France
| | - Marie Frénéa-Robin
- Univ Lyon, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, CNRS, Ampère, Ecully, France
| | - Philippe Renaud
- École Polytechnique Fédérale de Lausanne, EPFL-STI-IMT-LMIS4, Station 17, CH-1015, Lausanne, Switzerland
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Pathak AK, Pathak V, Reynolds RC. Solution-phase parallel synthesis of acyclic nucleoside libraries of purine, pyrimidine, and triazole acetamides. ACS COMBINATORIAL SCIENCE 2014; 16:485-93. [PMID: 24933643 PMCID: PMC4157782 DOI: 10.1021/co500067c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
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Molecular
diversity plays a pivotal role in modern drug discovery
against phenotypic or enzyme-based targets using high throughput screening
technology. Under the auspices of the Pilot Scale Library Program
of the NIH Roadmap Initiative, we produced and report herein a diverse
library of 181 purine, pyrimidine, and 1,2,4-triazole-N-acetamide analogues which were prepared in a parallel high throughput
solution-phase reaction format. A set of assorted amines were reacted
with several nucleic acid N-acetic acids utilizing
HATU as the coupling reagent to produce diverse acyclic nucleoside N-acetamide analogues. These reactions were performed using
24 well reaction blocks and an automatic reagent-dispensing platform
under inert atmosphere. The targeted compounds were purified on an
automated purification system using solid sample loading prepacked
cartridges and prepacked silica gel columns. All compounds were characterized
by NMR and HRMS, and were analyzed for purity by HPLC before submission
to the Molecular Libraries Small Molecule Repository (MLSMR) at NIH.
Initial screening through the Molecular Libraries Probe Production
Centers Network (MLPCN) program, indicates that several analogues
showed diverse and interesting biological activities.
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Affiliation(s)
- Ashish K. Pathak
- Drug Discovery Division, Southern Research Institute, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Vibha Pathak
- Drug Discovery Division, Southern Research Institute, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
| | - Robert C. Reynolds
- Drug Discovery Division, Southern Research Institute, 2000 Ninth Avenue South, Birmingham, Alabama 35205, United States
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de Jesus Perez V, Yuan K, Alastalo TP, Spiekerkoetter E, Rabinovitch M. Targeting the Wnt signaling pathways in pulmonary arterial hypertension. Drug Discov Today 2014; 19:1270-6. [PMID: 24955837 DOI: 10.1016/j.drudis.2014.06.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 06/16/2014] [Indexed: 10/25/2022]
Abstract
Pulmonary arterial hypertension (PAH) is a life-threatening disorder that is associated with elevated pulmonary pressures and right heart failure resulting from progressive loss and thickening of small pulmonary arteries. Despite their ability to improve symptoms, current therapies fail to prevent disease progression, leaving lung transplantation as the only therapy in end-stage PAH. To overcome the limitations of current therapies, there is an active search for disease-modifying agents capable of altering the natural history of, and improving clinical outcomes in, PAH. The Wnt signaling pathways have emerged as attractive treatment targets in PAH given their role in the preservation of pulmonary vascular homeostasis and the recent development of Wnt-specific compounds and biological therapies capable of modulating pathway activity. In this review, we summarize the literature describing the role of Wnt signaling in the pulmonary circulation and discuss promising advances in the field of Wnt therapeutics that could lead to novel clinical therapies capable of preventing and/or reversing pulmonary vascular pathology in patients with this devastating disease.
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Affiliation(s)
- Vinicio de Jesus Perez
- Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center, 300 Pasteur Drive Grant S140B, Stanford, CA 94305, USA.
| | - Ke Yuan
- Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center, 300 Pasteur Drive Grant S140B, Stanford, CA 94305, USA
| | - Tero-Pekka Alastalo
- Children's Hospital Helsinki, Tukholmankatu 8, FI-00290 Helsinki, Finland; Biomedicum Helsinski, Tukholmankatu 8, FI-00290 Helsinki, Finland Finland
| | - Edda Spiekerkoetter
- Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center, 300 Pasteur Drive Grant S140B, Stanford, CA 94305, USA
| | - Marlene Rabinovitch
- Pediatric Cardiology, Stanford University Medical Center, 300 Pasteur Drive Grant S140B, Stanford, CA 94305, USA
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Abstract
This review surveys selected methods of manufacture and applications of microdevices-miniaturized functional devices capable of handling cell and tissue cultures or producing particles-and discusses their potential relevance to nanomedicine. Many characteristics of microdevices such as miniaturization, increased throughput, and the ability to mimic organ-specific microenvironments are promising for the rapid, low-cost evaluation of the efficacy and toxicity of nanomaterials. Their potential to accurately reproduce the physiological environments that occur in vivo could reduce dependence on animal models in pharmacological testing. Technologies in microfabrications and microfluidics are widely applicable for nanomaterial synthesis and for the development of diagnostic devices. Although the use of microdevices in nanomedicine is still in its infancy, these technologies show promise for enhancing fundamental and applied research in nanomedicine.
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Affiliation(s)
- Michinao Hashimoto
- Laboratory for Biomaterials and Drug Delivery, Department of Anesthesiology, Division of Critical Care Medicine, Children's Hospital Boston, Harvard Medical School, Boston, MA 02115, USA
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Marcuello C, de Miguel R, Gomez-Moreno C, Martinez-Julvez M, Lostao A. An efficient method for enzyme immobilization evidenced by atomic force microscopy. Protein Eng Des Sel 2012; 25:715-23. [DOI: 10.1093/protein/gzs086] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gurkan UA, Xu F. Editorial: Scaffold-free cell-based approaches in biomedicine and biotechnology. Biotechnol J 2011; 6:1426-7. [PMID: 22162490 DOI: 10.1002/biot.201100467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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