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  • 1
    Publication Date: 2001-04-28
    Description: Embryonic stem (ES) cells are fully pluripotent in that they can differentiate into all cell types, including gametes. We have derived 35 ES cell lines via nuclear transfer (ntES cell lines) from adult mouse somatic cells of inbred, hybrid, and mutant strains. ntES cells contributed to an extensive variety of cell types, including dopaminergic and serotonergic neurons in vitro and germ cells in vivo. Cloning by transfer of ntES cell nuclei could result in normal development of fertile adults. These studies demonstrate the full pluripotency of ntES cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wakayama, T -- Tabar, V -- Rodriguez, I -- Perry, A C -- Studer, L -- Mombaerts, P -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):740-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Rockefeller University, New York, NY 10021, USA. teru@advancedcell.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11326103" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastocyst/*cytology ; *Cell Differentiation ; Cell Line ; Cell Lineage ; Chimera ; Cloning, Organism ; Crosses, Genetic ; Dopamine/metabolism ; Embryo Transfer ; Female ; Germ Cells/*cytology ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Inbred DBA ; Mice, Inbred ICR ; Mice, Nude ; Neurons/*cytology ; *Nuclear Transfer Techniques ; Serotonin/metabolism ; Stem Cells/*cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2009-08-21
    Description: The isolation of human induced pluripotent stem cells (iPSCs) offers a new strategy for modelling human disease. Recent studies have reported the derivation and differentiation of disease-specific human iPSCs. However, a key challenge in the field is the demonstration of disease-related phenotypes and the ability to model pathogenesis and treatment of disease in iPSCs. Familial dysautonomia (FD) is a rare but fatal peripheral neuropathy, caused by a point mutation in the IKBKAP gene involved in transcriptional elongation. The disease is characterized by the depletion of autonomic and sensory neurons. The specificity to the peripheral nervous system and the mechanism of neuron loss in FD are poorly understood owing to the lack of an appropriate model system. Here we report the derivation of patient-specific FD-iPSCs and the directed differentiation into cells of all three germ layers including peripheral neurons. Gene expression analysis in purified FD-iPSC-derived lineages demonstrates tissue-specific mis-splicing of IKBKAP in vitro. Patient-specific neural crest precursors express particularly low levels of normal IKBKAP transcript, suggesting a mechanism for disease specificity. FD pathogenesis is further characterized by transcriptome analysis and cell-based assays revealing marked defects in neurogenic differentiation and migration behaviour. Furthermore, we use FD-iPSCs for validating the potency of candidate drugs in reversing aberrant splicing and ameliorating neuronal differentiation and migration. Our study illustrates the promise of iPSC technology for gaining new insights into human disease pathogenesis and treatment.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784695/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2784695/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Gabsang -- Papapetrou, Eirini P -- Kim, Hyesoo -- Chambers, Stuart M -- Tomishima, Mark J -- Fasano, Christopher A -- Ganat, Yosif M -- Menon, Jayanthi -- Shimizu, Fumiko -- Viale, Agnes -- Tabar, Viviane -- Sadelain, Michel -- Studer, Lorenz -- R01 NS052671/NS/NINDS NIH HHS/ -- R01 NS052671-03/NS/NINDS NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):402-6. doi: 10.1038/nature08320. Epub 2009 Aug 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental Biology Program, Sloan-Kettering Institute, 1275 York Ave, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19693009" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Alternative Splicing/drug effects/genetics ; Animals ; Carrier Proteins/genetics ; Cell Dedifferentiation ; Cell Differentiation ; Cell Lineage ; Cell Movement ; Cells, Cultured ; Child ; Dysautonomia, Familial/drug therapy/genetics/*pathology/*therapy ; Female ; Fibroblasts/cytology/metabolism ; Gene Expression Profiling ; Humans ; Kinetin/pharmacology/therapeutic use ; Male ; Mice ; *Models, Biological ; Neural Crest/cytology/drug effects ; Organ Specificity ; Phenotype ; Pluripotent Stem Cells/cytology/drug effects/*metabolism/*transplantation
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2011-11-08
    Description: Human pluripotent stem cells (PSCs) are a promising source of cells for applications in regenerative medicine. Directed differentiation of PSCs into specialized cells such as spinal motoneurons or midbrain dopamine (DA) neurons has been achieved. However, the effective use of PSCs for cell therapy has lagged behind. Whereas mouse PSC-derived DA neurons have shown efficacy in models of Parkinson's disease, DA neurons from human PSCs generally show poor in vivo performance. There are also considerable safety concerns for PSCs related to their potential for teratoma formation or neural overgrowth. Here we present a novel floor-plate-based strategy for the derivation of human DA neurons that efficiently engraft in vivo, suggesting that past failures were due to incomplete specification rather than a specific vulnerability of the cells. Midbrain floor-plate precursors are derived from PSCs 11 days after exposure to small molecule activators of sonic hedgehog (SHH) and canonical WNT signalling. Engraftable midbrain DA neurons are obtained by day 25 and can be maintained in vitro for several months. Extensive molecular profiling, biochemical and electrophysiological data define developmental progression and confirm identity of PSC-derived midbrain DA neurons. In vivo survival and function is demonstrated in Parkinson's disease models using three host species. Long-term engraftment in 6-hydroxy-dopamine-lesioned mice and rats demonstrates robust survival of midbrain DA neurons derived from human embryonic stem (ES) cells, complete restoration of amphetamine-induced rotation behaviour and improvements in tests of forelimb use and akinesia. Finally, scalability is demonstrated by transplantation into parkinsonian monkeys. Excellent DA neuron survival, function and lack of neural overgrowth in the three animal models indicate promise for the development of cell-based therapies in Parkinson's disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3245796/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3245796/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kriks, Sonja -- Shim, Jae-Won -- Piao, Jinghua -- Ganat, Yosif M -- Wakeman, Dustin R -- Xie, Zhong -- Carrillo-Reid, Luis -- Auyeung, Gordon -- Antonacci, Chris -- Buch, Amanda -- Yang, Lichuan -- Beal, M Flint -- Surmeier, D James -- Kordower, Jeffrey H -- Tabar, Viviane -- Studer, Lorenz -- NS052671/NS/NINDS NIH HHS/ -- P50 NS047085/NS/NINDS NIH HHS/ -- P50 NS071669/NS/NINDS NIH HHS/ -- P50 NS071669-03/NS/NINDS NIH HHS/ -- England -- Nature. 2011 Nov 6;480(7378):547-51. doi: 10.1038/nature10648.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Stem Cell Biology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22056989" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Brain Tissue Transplantation ; Cell Differentiation ; Cell Line ; Cell Survival ; Dopaminergic Neurons/*cytology/*transplantation ; Embryonic Stem Cells/*cytology ; Female ; Humans ; Macaca mulatta ; Mesencephalon/cytology ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Parkinson Disease/*therapy ; Rats ; Rats, Sprague-Dawley
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2016-02-11
    Description: The enteric nervous system (ENS) is the largest component of the autonomic nervous system, with neuron numbers surpassing those present in the spinal cord. The ENS has been called the 'second brain' given its autonomy, remarkable neurotransmitter diversity and complex cytoarchitecture. Defects in ENS development are responsible for many human disorders including Hirschsprung disease (HSCR). HSCR is caused by the developmental failure of ENS progenitors to migrate into the gastrointestinal tract, particularly the distal colon. Human ENS development remains poorly understood owing to the lack of an easily accessible model system. Here we demonstrate the efficient derivation and isolation of ENS progenitors from human pluripotent stem (PS) cells, and their further differentiation into functional enteric neurons. ENS precursors derived in vitro are capable of targeted migration in the developing chick embryo and extensive colonization of the adult mouse colon. The in vivo engraftment and migration of human PS-cell-derived ENS precursors rescue disease-related mortality in HSCR mice (Ednrb(s-l/s-l)), although the mechanism of action remains unclear. Finally, EDNRB-null mutant ENS precursors enable modelling of HSCR-related migration defects, and the identification of pepstatin A as a candidate therapeutic target. Our study establishes the first, to our knowledge, human PS-cell-based platform for the study of human ENS development, and presents cell- and drug-based strategies for the treatment of HSCR.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846424/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4846424/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fattahi, Faranak -- Steinbeck, Julius A -- Kriks, Sonja -- Tchieu, Jason -- Zimmer, Bastian -- Kishinevsky, Sarah -- Zeltner, Nadja -- Mica, Yvonne -- El-Nachef, Wael -- Zhao, Huiyong -- de Stanchina, Elisa -- Gershon, Michael D -- Grikscheit, Tracy C -- Chen, Shuibing -- Studer, Lorenz -- DP2 DK098093-01/DK/NIDDK NIH HHS/ -- NS15547/NS/NINDS NIH HHS/ -- P30 CA008748/CA/NCI NIH HHS/ -- R01 NS015547/NS/NINDS NIH HHS/ -- England -- Nature. 2016 Mar 3;531(7592):105-9. doi: 10.1038/nature16951. Epub 2016 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Center for Stem Cell Biology, New York, New York 10065, USA. ; Developmental Biology Program, Sloan-Kettering Institute for Cancer Research, New York, New York 10065, USA. ; Weill Graduate School of Medical Sciences of Cornell University, New York, New York 10065, USA. ; Molecular Pharmacology Program, New York, New York 10065, USA. ; Department of Pathology and Cell Biology, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA. ; Children's Hospital Los Angeles, Pediatric Surgery, Los Angeles, California 90027, USA. ; Department of Surgery, Weill Medical College of Cornell University, New York, New York 10065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26863197" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Cell Differentiation ; Cell Line ; *Cell Lineage ; Cell Movement ; Cell Separation ; *Cell- and Tissue-Based Therapy/methods ; Chick Embryo ; Colon/drug effects/pathology ; Disease Models, Animal ; Drug Discovery/*methods ; Enteric Nervous System/*pathology ; Female ; Gastrointestinal Tract/drug effects/pathology ; Hirschsprung Disease/*drug therapy/*pathology/therapy ; Humans ; Male ; Mice ; Neurons/drug effects/*pathology ; Pepstatins/metabolism ; Pluripotent Stem Cells/pathology ; Receptor, Endothelin B/metabolism ; Signal Transduction
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    Unknown
    In:  Other Sources
    Publication Date: 2011-08-17
    Description: A small compact magnetic bearing design developed and tested features a bearing capable of supporting over ten times its own weight, dimensioned 8 cm diam by 3.75 cm, with rare-earth cobalt magnets. Only 1% of the device payload figures as part of the magnetic suspension. The design is servoed in two axes and exhibits inherent stability in three more degrees of freedom, with full rotational freedom in the desired axis. Capacitive radial gap sensing allows stiff servoing of the rotation axis. Differential sensing and EM control linearize control functions. Low power drain, simple fabrication and assembly, and larger clearances than in air bearings or ball bearings are reported
    Keywords: MECHANICAL ENGINEERING
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  • 6
    Publication Date: 2013-08-29
    Description: Magnetic suspension technology has advanced to the point of being able to offer a number of advantages to a variety of applications in the rotating machinery and aerospace fields. One strong advantage is the decrease in power consumption. The design and construction of a set of permanent magnet biased, actively controlled magnetic bearing for a flexible rotor are presented. Both permanent magnets and electromagnets are used in a configuration which effectively provides the necessary fluxes in the appropriate air gaps, while simultaneously keeping the undesirable destabilizing forces to a minimum. The design includes two radial bearings and a thrust bearing. The theoretical development behind the design is briefly discussed. Experimental performance results for a set of operating prototype bearings is presented. The results include measurements of load capacity, bearing stiffness and damping, and the dynamic response of the rotor. With few exceptions, the experimental results matched very well with the predicted performance. The power consumption of these bearings was found to be significantly reduced from that for a comparable set of all electromagnetic bearings.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, International Symposium on Magnetic Suspension Technology, Part 1; p 317-329
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  • 7
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2019-06-28
    Description: A plurality of identical modules are serially connected together with each module including a base plate and a top plate interconnected by a ball joint assembly so that the top plate is adapted to pivotally nutate around the base plate to describe a cone in space. An array of twenty-four electromagnets, sequentially energized in sets of three, are arranged in a ring around the periphery of the base plate. Selective energization of the eight sets of electromagnets causes the rim of the top plate to be magnetically attracted to the energized electromagnets. The tilt of the top pivot plate is detected and controlled over a range of 360 degrees, thus permitting a series string of modules to assume any desired elongated configuration.
    Keywords: MECHANICAL ENGINEERING
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  • 8
    Publication Date: 2019-06-28
    Description: This paper presents the system considerations of a magnetically suspended energy storage system. The key technologies for system success are presented in a technology flowchart. The key areas identified and discussed include: the active bearing control system, the back-up touchdown bearings, and the flywheel dynamic performance and balancing. Two possible hardware designs are described which have been identified as having characteristics suitable for energy storage in low earth orbit spacecraft. Finally, a matrix of the key technologies versus the various prototype designs is presented to show the current progress of inertial energy storage, and to show the direction of future work.
    Keywords: MECHANICAL ENGINEERING
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  • 9
    Publication Date: 2019-06-28
    Description: Research activities concerning high efficiency permanent magnet plus electromagnet (PM/EM) pancake magnetic bearings at the University of Maryland are reported. A description of the construction and working of the magnetic bearing is provided. Next, parameters needed to describe the bearing are explained. Then, methods developed for the design and testing of magnetic bearings are summarized. Finally, a new magnetic bearing which allows active torque control in the off axes directions is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, Magnetic Suspension Technology Workshop; p 327-337
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  • 10
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2019-06-28
    Description: A linear magnetic bearing system having electromagnetic vernier flux paths in shunt relation with permanent magnets, so that the vernier flux does not traverse the permanent magnet, is described. Novelty is believed to reside in providing a linear magnetic bearing having electromagnetic flux paths that bypass high reluctance permanent magnets. Particular novelty is believed to reside in providing a linear magnetic bearing with a pair of axially spaced elements having electromagnets for establishing vernier x and y axis control. The magnetic bearing system has possible use in connection with a long life reciprocating cryogenic refrigerator that may be used on the space shuttle.
    Keywords: MECHANICAL ENGINEERING
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