FN Thomson Reuters Web of Knowledge VR 1.0 PT J AU Kleindienst, T Winnubst, J Roth-Alpermann, C Bonhoeffer, T Lohmann, C AF Kleindienst, Thomas Winnubst, Johan Roth-Alpermann, Claudia Bonhoeffer, Tobias Lohmann, Christian TI Activity-Dependent Clustering of Functional Synaptic Inputs on Developing Hippocampal Dendrites SO NEURON LA English DT Article ID NEONATAL-RAT HIPPOCAMPUS; CA1 PYRAMIDAL NEURONS; IN-VIVO; CALCIUM TRANSIENTS; SYNAPSES; CELLS; MECHANISMS; PLASTICITY; DYNAMICS; SYSTEM AB During brain development, before sensory systems become functional, neuronal networks spontaneously generate repetitive bursts of neuronal activity, which are typically synchronized across many neurons. Such activity patterns have been described on the level of networks and cells, but the fine-structure of inputs received by an individual neuron during spontaneous network activity has not been studied. Here, we used calcium imaging to record activity at many synapses of hippocampal pyramidal neurons simultaneously to establish the activity patterns in the majority of synapses of an entire cell. Analysis of the spatiotemporal patterns of synaptic activity revealed a fine-scale connectivity rule: neighboring synapses (<16 mu m intersynapse distance) are more likely to be coactive than synapses that are farther away from each other. Blocking spiking activity or NMDA receptor activation revealed that the clustering of synaptic inputs required neuronal activity, demonstrating a role of developmentally expressed spontaneous activity for connecting neurons with subcellular precision. C1 [Kleindienst, Thomas; Winnubst, Johan; Lohmann, Christian] Netherlands Inst Neurosci, NL-1105 BA Amsterdam, Netherlands. [Kleindienst, Thomas; Roth-Alpermann, Claudia; Bonhoeffer, Tobias; Lohmann, Christian] Max Planck Inst Neurobiol, D-82152 Martinsried, Germany. RP Lohmann, C (reprint author), Netherlands Inst Neurosci, NL-1105 BA Amsterdam, Netherlands EM c.lohmann@nin.knaw.nl PU CELL PRESS PI CAMBRIDGE PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA SN 0896-6273 J9 NEURON JI Neuron PD DEC 22 PY 2011 VL 72 IS 6 BP 1012 EP 1024 DI 10.1016/j.neuron.2011.10.015 PG 13 GA 871XM UT WOS:000298771000015 ER PT J AU Berer, K Mues, M Koutrolos, M Al Rasbi, Z Boziki, M Johner, C Wekerle, H Krishnamoorthy, G AF Berer, Kerstin Mues, Marsilius Koutrolos, Michail Al Rasbi, Zakeya Boziki, Marina Johner, Caroline Wekerle, Hartmut Krishnamoorthy, Gurumoorthy TI Commensal microbiota and myelin autoantigen cooperate to trigger autoimmune demyelination SO NATURE LA English DT Article ID T-CELL RESPONSES; MULTIPLE-SCLEROSIS; B-CELLS; TRANSGENIC MICE; AUTOANTIBODIES; INDUCTION; BACTERIA; DISEASE; MOG AB Active multiple sclerosis lesions show inflammatory changes suggestive of a combined attack by autoreactive T and B lymphocytes against brain white matter(1). These pathogenic immune cells derive from progenitors that are normal, innocuous components of the healthy immune repertoire but become autoaggressive upon pathological activation. The stimuli triggering this autoimmune conversion have been commonly attributed to environmental factors, in particular microbial infection(2). However, using the relapsing-remitting mouse model of spontaneously developing experimental autoimmune encephalomyelitis(3), here we show that the commensal gut flora-in the absence of pathogenic agents-is essential in triggering immune processes, leading to a relapsing-remitting autoimmune disease driven by myelin-specific CD4(+) T cells. We show further that recruitment and activation of autoantibody-producing B cells from the endogenous immune repertoire depends on availability of the target autoantigen, myelin oligodendrocyte glycoprotein (MOG), and commensal microbiota. Our observations identify a sequence of events triggering organ-specific autoimmune disease and these processes may offer novel therapeutic targets. C1 [Berer, Kerstin; Mues, Marsilius; Koutrolos, Michail; Al Rasbi, Zakeya; Boziki, Marina; Wekerle, Hartmut; Krishnamoorthy, Gurumoorthy] Max Planck Inst Neurobiol, Dept Neuroimmunol, D-82152 Martinsried, Germany. [Johner, Caroline] Max Planck Inst Immunobiol & Epigenet, D-79108 Freiburg, Germany. RP Wekerle, H (reprint author), Max Planck Inst Neurobiol, Dept Neuroimmunol, D-82152 Martinsried, Germany EM hwekerle@neuro.mpg.de guru@neuro.mpg.de PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD NOV 24 PY 2011 VL 479 IS 7374 BP 538 EP U266 DI 10.1038/nature10554 PG 5 GA 851QI UT WOS:000297285600053 ER PT J AU Yamagishi, S Hampel, F Hata, K del Toro, D Schwark, M Kvachnina, E Bastmeyer, M Yamashita, T Tarabykin, V Klein, R Egea, J AF Yamagishi, Satoru Hampel, Falko Hata, Katsuhiko del Toro, Daniel Schwark, Manuela Kvachnina, Elena Bastmeyer, Martin Yamashita, Toshihide Tarabykin, Victor Klein, Ruediger Egea, Joaquim TI FLRT2 and FLRT3 act as repulsive guidance cues for Unc5-positive neurons RID C-6147-2008 SO EMBO JOURNAL LA English DT Article DE cell migration; cortex development; FLRT; repulsive guidance; Unc5 ID CELL-ADHESION; SUBVENTRICULAR ZONE; NEURITE OUTGROWTH; RECEPTOR GENE; AXON GUIDANCE; MIGRATION; MOLECULE; PROTEIN; IDENTIFICATION; SPECIFICATION AB Netrin-1 induces repulsive axon guidance by binding to the mammalian Unc5 receptor family (Unc5A-Unc5D). Mouse genetic analysis of selected members of the Unc5 family, however, revealed essential functions independent of Netrin-1, suggesting the presence of other ligands. Unc5B was recently shown to bind fibronectin and leucine-rich transmembrane protein-3 (FLRT3), although the relevance of this interaction for nervous system development remained unclear. Here, we show that the related Unc5D receptor binds specifically to another FLRT protein, FLRT2. During development, FLRT2/3 ectodomains (ECDs) are shed from neurons and act as repulsive guidance molecules for axons and somata of Unc5-positive neurons. In the developing mammalian neocortex, Unc5D is expressed by neurons in the sub-ventricular zone (SVZ), which display delayed migration to the FLRT2-expressing cortical plate (CP). Deletion of either FLRT2 or Unc5D causes a subset of SVZ-derived neurons to prematurely migrate towards the CP, whereas overexpression of Unc5D has opposite effects. Hence, the shed FLRT2 and FLRT3 ECDs represent a novel family of chemorepellents for Unc5-positive neurons and FLRT2/Unc5D signalling modulates cortical neuron migration. The EMBO Journal ( 2011) 30, 2920-2933. doi:10.1038/emboj.2011.189; Published online 14 June 2011 C1 [Yamagishi, Satoru; Hampel, Falko; del Toro, Daniel; Klein, Ruediger; Egea, Joaquim] Max Planck Inst Neurobiol, Dept Mol Neurobiol, D-82152 Martinsried, Germany. [Hata, Katsuhiko; Yamashita, Toshihide] Osaka Univ, Grad Sch Med, Dept Mol Neurosci, Osaka, Japan. [Schwark, Manuela; Kvachnina, Elena; Tarabykin, Victor] Max Planck Inst Expt Med, D-3400 Gottingen, Germany. [Schwark, Manuela; Tarabykin, Victor] Charite, Inst Cell Biol & Neurobiol, D-13353 Berlin, Germany. [Bastmeyer, Martin] KIT, Inst Zool, Abt Zell & Neurobiol, Karlsruhe, Germany. [Egea, Joaquim] Univ Lleida, IRBLLEIDA, Fac Med, Dept Ciencies Med Basiques, Lleida 25198, Spain. RP Klein, R (reprint author), Max Planck Inst Neurobiol, Dept Mol Neurobiol, Klopferspitz 18, D-82152 Martinsried, Germany EM rklein@neuro.mpg.de joaquim.egea@cmb.udl.es PU NATURE PUBLISHING GROUP PI NEW YORK PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA SN 0261-4189 J9 EMBO J JI Embo J. PD JUL 20 PY 2011 VL 30 IS 14 BP 2920 EP 2933 DI 10.1038/emboj.2011.189 PG 14 GA 808HZ UT WOS:000293970100017 ER PT J AU Schuster, FR Hubner, B Fuhrer, M Eckermann, O Gombert, M Dornmair, K Binder, V Reuther, S Krell, P Keller, T Borkhardt, A AF Schuster, F. R. Hubner, B. Fuehrer, M. Eckermann, O. Gombert, M. Dornmair, K. Binder, V. Reuther, S. Krell, P. Keller, T. Borkhardt, A. TI Highly skewed T-cell receptor V-beta chain repertoire in the bone marrow is associated with response to immunosuppressive drug therapy in children with very severe aplastic anemia SO BLOOD CANCER JOURNAL LA English DT Article DE aplastic anemia; T-cell receptor V-beta chain repertoire; children ID IMMUNE-RESPONSES; PATHOPHYSIOLOGY; RECONSTITUTION; SURVIVAL; DISEASE AB One of the major obstacles of immunosuppressive therapy (IST) in children with severe aplastic anemia (SAA) comes from the often months-long unpredictability of bone-marrow (BM) recovery. In this prospective study in children with newly diagnosed very severe AA (n = 10), who were enrolled in the therapy study SAA-BFM 94, we found a dramatically reduced diversity of both CD4+ and CD8+ BM cells, as scored by comprehensive V-beta chain T-cell receptor (TCR) analysis. Strongly skewed TCR V-beta pattern was highly predictive for good or at least partial treatment response (n = 6, CD8+ complexity scoring median 35.5, range 24-73). In contrast, IST in patients with rather moderate reduction of TCR V-beta diversity (n = 4, CD8+ complexity scoring median 109.5, range 82-124) always failed (P = 0.0095). If confirmed in a larger series of patients, TCR V-beta repertoire in BM may help to assign children with SAA up-front either to IST or to allogeneic stem-cell transplantation. Blood Cancer Journal (2011) 1, e8; doi:10.1038/bcj.2011.6; published online 4 March 2011 C1 [Borkhardt, A.] Univ Dusseldorf, Dept Pediat Oncol Hematol & Clin Immunol, Ctr Child & Adolescent Hlth, Clin Pediat Oncol Hematol & Clin Immunol,Med Fac, D-40225 Dusseldorf, Germany. [Fuehrer, M.] Univ Munich, Dept Pediat Oncol & Hematol, Dr von Haunersches Childrens Hosp, Munich, Germany. [Dornmair, K.] Univ Munich, Dept Clin Neuroimmunol, Munich, Germany. [Keller, T.] Stat Anal GmbH, Acomed, Leipzig, Germany. RP Borkhardt, A (reprint author), Univ Dusseldorf, Dept Pediat Oncol Hematol & Clin Immunol, Ctr Child & Adolescent Hlth, Clin Pediat Oncol Hematol & Clin Immunol,Med Fac, Moorenstr 5, D-40225 Dusseldorf, Germany EM arndt.borkhardt@med.uni-duesseldorf.de PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 2044-5385 J9 BLOOD CANCER J JI Blood Cancer J. PD MAR PY 2011 VL 1 AR e8 DI 10.1038/bcj.2011.6 PG 4 GA 872NC UT WOS:000298815400002 ER PT J AU Junker, A Hohlfeld, R Meinl, E AF Junker, Andreas Hohlfeld, Reinhard Meinl, Edgar TI The emerging role of microRNAs in multiple sclerosis SO NATURE REVIEWS NEUROLOGY LA English DT Article ID OLIGODENDROCYTE DIFFERENTIATION; IN-VIVO; LESIONS; CELLS; SYSTEM; MIRNA; IDENTIFICATION; MYELINATION; TARGETS; CD47 AB Several hundred microRNAs (miRNAs) fine-tune the expression of approximately half of all human genes. Recent studies have revealed that miRNA profiles in blood cells become altered in multiple sclerosis (MS), and that active and inactive MS lesions have distinct miRNA expression patterns. The dysregulated miRNAs in MS lesions seem to be associated with astrocytes and infiltrating immune cells, and might unleash local macrophages through downregulation of the self-recognition signal CD47. The expression of miRNA-326 in blood cells has been reported to increase during relapses. This miRNA promotes T helper 17 cell differentiation and is highly abundant in active MS lesions. miRNAs are needed for maintenance of the myelin sheath, and the absence of such molecules results in axonal damage in mice. miRNA-219 and other miRNAs promote oligodendrocyte differentiation. Here, we discuss the possible contribution of miRNAs to MS pathogenesis. An improved understanding of this contribution should help to identify novel therapeutic targets and biomarkers for this disease. C1 [Hohlfeld, Reinhard; Meinl, Edgar] Univ Munich, Inst Clin Neuroimmunol, D-81377 Munich, Germany. [Junker, Andreas] Univ Gottingen, Dept Neuropathol, Univ Med Ctr, D-37075 Gottingen, Germany. RP Meinl, E (reprint author), Univ Munich, Inst Clin Neuroimmunol, Marchioninistr 15, D-81377 Munich, Germany EM meinl@neuro.mpg.de PU NATURE PUBLISHING GROUP PI NEW YORK PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA SN 1759-4758 J9 NAT REV NEUROL JI Nat. Rev. Neurol. PD JAN PY 2011 VL 7 IS 1 BP 56 EP 59 DI 10.1038/nrneurol.2010.179 PG 4 GA 705AG UT WOS:000286099300012 ER EF