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Macromolecular and Electrical Coupling Between Inner Hair Cells in the Rodent Cochlea
ARTICLE https://doi.org/10.1038/s41467-020-17003-z OPEN Macromolecular and electrical coupling between inner hair cells in the rodent cochlea Philippe Jean 1,2,3,4,14, Tommi Anttonen1,2,5,14, Susann Michanski2,6,7, Antonio M. G. de Diego8, Anna M. Steyer9,10, Andreas Neef11, David Oestreicher 12, Jana Kroll 2,4,6,7, Christos Nardis9,10, ✉ Tina Pangršič2,12, Wiebke Möbius 9,10, Jonathan Ashmore 8, Carolin Wichmann2,6,7,13 & ✉ Tobias Moser 1,2,3,5,10,13 1234567890():,; Inner hair cells (IHCs) are the primary receptors for hearing. They are housed in the cochlea and convey sound information to the brain via synapses with the auditory nerve. IHCs have been thought to be electrically and metabolically independent from each other. We report that, upon developmental maturation, in mice 30% of the IHCs are electrochemically coupled in ‘mini-syncytia’. This coupling permits transfer of fluorescently-labeled metabolites and macromolecular tracers. The membrane capacitance, Ca2+-current, and resting current increase with the number of dye-coupled IHCs. Dual voltage-clamp experiments substantiate low resistance electrical coupling. Pharmacology and tracer permeability rule out coupling by gap junctions and purinoceptors. 3D electron microscopy indicates instead that IHCs are coupled by membrane fusion sites. Consequently, depolarization of one IHC triggers pre- synaptic Ca2+-influx at active zones in the entire mini-syncytium. Based on our findings and modeling, we propose that IHC-mini-syncytia enhance sensitivity and reliability of cochlear sound encoding. 1 Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany. 2 Collaborative Research Center 889, University of Göttingen, Göttingen, Germany. -
Female Fellows of the Royal Society
Female Fellows of the Royal Society Professor Jan Anderson FRS [1996] Professor Ruth Lynden-Bell FRS [2006] Professor Judith Armitage FRS [2013] Dr Mary Lyon FRS [1973] Professor Frances Ashcroft FMedSci FRS [1999] Professor Georgina Mace CBE FRS [2002] Professor Gillian Bates FMedSci FRS [2007] Professor Trudy Mackay FRS [2006] Professor Jean Beggs CBE FRS [1998] Professor Enid MacRobbie FRS [1991] Dame Jocelyn Bell Burnell DBE FRS [2003] Dr Philippa Marrack FMedSci FRS [1997] Dame Valerie Beral DBE FMedSci FRS [2006] Professor Dusa McDuff FRS [1994] Dr Mariann Bienz FMedSci FRS [2003] Professor Angela McLean FRS [2009] Professor Elizabeth Blackburn AC FRS [1992] Professor Anne Mills FMedSci FRS [2013] Professor Andrea Brand FMedSci FRS [2010] Professor Brenda Milner CC FRS [1979] Professor Eleanor Burbidge FRS [1964] Dr Anne O'Garra FMedSci FRS [2008] Professor Eleanor Campbell FRS [2010] Dame Bridget Ogilvie AC DBE FMedSci FRS [2003] Professor Doreen Cantrell FMedSci FRS [2011] Baroness Onora O'Neill * CBE FBA FMedSci FRS [2007] Professor Lorna Casselton CBE FRS [1999] Dame Linda Partridge DBE FMedSci FRS [1996] Professor Deborah Charlesworth FRS [2005] Dr Barbara Pearse FRS [1988] Professor Jennifer Clack FRS [2009] Professor Fiona Powrie FRS [2011] Professor Nicola Clayton FRS [2010] Professor Susan Rees FRS [2002] Professor Suzanne Cory AC FRS [1992] Professor Daniela Rhodes FRS [2007] Dame Kay Davies DBE FMedSci FRS [2003] Professor Elizabeth Robertson FRS [2003] Professor Caroline Dean OBE FRS [2004] Dame Carol Robinson DBE FMedSci -
Newsletter 8
Fellowship Newsletter 8 Clinical Academic Medicine in Jeopardy Recruitment is in crisis and those already following a time for research, and proposes clinical academic career are under pressure as never solutions for the particular before. The attraction of a career in difficulties experienced in craft clinical academic medicine is specialties such as surgery, fading and while the public anaesthetics, obstetrics and have strong expectations for gynaecology, radiology, and high medical standards and cardiology. rapid developments in health- Professor Sir Peter Morris FRS, care more than 10% of PRCS, FMedSci, chairman of professorial and senior lecturer the Academy working group posts remain unfilled and the that produced the report said at shortage of clinical research its launch ‘The situation for workers and clinical teachers academic medicine is becoming desperate espe- raises serious worries. cially for craft specialties such as surgery. The Academy’s latest report Concerted action by all the stakeholders - the Clinical academic medicine in Academy, government, the universities, the medical jeopardy, confronts these issues, royal colleges and others - is needed now, not only to demands urgent action to improve recruitment and produce the next generation of doctors but also to retention and spells out the consequences of inaction. maintain the translation of basic biological research into It makes practical suggestions for how this can be clinical practice in the UK’. achieved by addressing contractual and remuneration The report may be downloaded from the Academy’s issues, and appraisal and revalidation practices, and web site or paper copies obtained free from Tony Leaney improving career progress. It stresses the importance at the Academy. -
Expression of the Short Stature Homeobox Gene Shox Is Restricted by Proximal and Distal Signals in Chick Limb Buds and Affects the Length of Skeletal Elements
Developmental Biology 298 (2006) 585–596 www.elsevier.com/locate/ydbio Expression of the short stature homeobox gene Shox is restricted by proximal and distal signals in chick limb buds and affects the length of skeletal elements Eva Tiecke a, Fiona Bangs a, Rudiger Blaschke b, Elizabeth R. Farrell a, ⁎ Gudrun Rappold b, Cheryll Tickle a, a Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, UK b Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, D-69120 Heidelberg, Germany Received for publication 6 June 2006; accepted 10 July 2006 Available online 12 July 2006 Abstract SHOX is a homeobox-containing gene, highly conserved among species as diverse as fish, chicken and humans. SHOX gene mutations have been shown to cause idiopathic short stature and skeletal malformations frequently observed in human patients with Turner, Leri–Weill and Langer syndromes. We cloned the chicken orthologue of SHOX, studied its expression pattern and compared this with expression of the highly related Shox2. Shox is expressed in central regions of early chick limb buds and proximal two thirds of later limbs, whereas Shox2 is expressed more posteriorly in the proximal third of the limb bud. Shox expression is inhibited distally by signals from the apical ectodermal ridge, both Fgfs and Bmps, and proximally by retinoic acid signaling. We tested Shox functions by overexpression in embryos and micromass cultures. Shox- infected chick limbs had normal proximo-distal patterning but the length of skeletal elements was consistently increased. Primary chick limb bud cell cultures infected with Shox showed an initial increase in cartilage nodules but these did not enlarge. -
The Rhesus Factor and Disease Prevention
THE RHESUS FACTOR AND DISEASE PREVENTION The transcript of a Witness Seminar held by the Wellcome Trust Centre for the History of Medicine at UCL, London, on 3 June 2003 Edited by D T Zallen, D A Christie and E M Tansey Volume 22 2004 ©The Trustee of the Wellcome Trust, London, 2004 First published by the Wellcome Trust Centre for the History of Medicine at UCL, 2004 The Wellcome Trust Centre for the History of Medicine at University College London is funded by the Wellcome Trust, which is a registered charity, no. 210183. ISBN 978 0 85484 099 1 Histmed logo images courtesy Wellcome Library, London. Design and production: Julie Wood at Shift Key Design 020 7241 3704 All volumes are freely available online at: www.history.qmul.ac.uk/research/modbiomed/wellcome_witnesses/ Please cite as : Zallen D T, Christie D A, Tansey E M. (eds) (2004) The Rhesus Factor and Disease Prevention. Wellcome Witnesses to Twentieth Century Medicine, vol. 22. London: Wellcome Trust Centre for the History of Medicine at UCL. CONTENTS Illustrations and credits v Witness Seminars: Meetings and publications;Acknowledgements vii E M Tansey and D A Christie Introduction Doris T Zallen xix Transcript Edited by D T Zallen, D A Christie and E M Tansey 1 References 61 Biographical notes 75 Glossary 85 Index 89 Key to cover photographs ILLUSTRATIONS AND CREDITS Figure 1 John Walker-Smith performs an exchange transfusion on a newborn with haemolytic disease. Photograph provided by Professor John Walker-Smith. Reproduced with permission of Memoir Club. 13 Figure 2 Radiograph taken on day after amniocentesis for bilirubin assessment and followed by contrast (1975). -
Bourne Lecture
“One Medicine: the Continuum of Medicine, Veterinary Medicine and Biomedical Science”. Bourne Lecture. 12th February 2007. St Georges Medical School , Grenada. Ian McConnell , Professor of Veterinary Science, Department of Veterinary Medicine, University of Cambridge, England, United Kingdom. Introduction. Chancellor, Provost , Ladies and Gentlemen. Thank you , Provost, for your generous introduction. It is indeed an honour to be invited to give this years Bourne lecture in memory of Geoffrey Bourne . Geoffrey Bourne , your first Vice Chancellor who as an educator and scientist who had the vision to create here in this marvellous country of Grenada a most remarkable medical school which later evolved under the leadership of Keith Taylor, as Vice Chancellor, into what is today- a thriving and confident young University. St George’s University is an internationally recognised institution of higher education which has set a dynamic global perspective and can rightly claim to be a stratgically important landmark of learning in the West Indies. In this lecture I am going to address the topic of “ One Medicine”. I have chosen this as a topic because it seems appropriate to the St. George’s Medical School and the close relationship it has with the veterinary school. The development of the veterinary school owes much to the foresight and drive of Peter Bourne, who as Vice Chancellor, fostered the development of veterinary medicine. In the long history of both the Medical and the Veterinary Professions and the education of undergraduates in both there has always been a healthy interaction between medicine, veterinary medicine as well as biomedical science. The co-location of a medical school with a veterinary school which you have here is one way to promote this interaction . -
Principles of Development Lewis Wolpert
Principles of development lewis wolpert Continue The process of biological development is an amazing feat of tightly regulated cellular behavior - differentiation, movement and growth - powerful enough to lead to the appearance of a very complex living organism from a single cell, a fertilized egg. The principles of development clearly illustrate the universal principles governing this development process in a concise and accessible style. Written by two respected and influential development biologists, Lewis Volpert and Sheryl Tickle, it focuses on the systems that best illuminate the general principles covered by the text and avoids suppressing the reader with encyclopedic details. With co-authors whose experience spans discipline, The Principles of Development combines the careful study of the subject with ideas from some of the world's pioneers of research in development biology, guiding the student from the basics to the latest discoveries in the field. The Internet Resource Center Internet Resource Center to accompany the Principles of Development features For registered adopters of text: Electronic works of art: Figures from the book are available for download, for use in lectures. Journal Club: Proposed scientific papers and discussion related to the topics presented in the book direct the process of learning from the scientific literature. PowerPoint numbers: Figures inserted into PowerPoint for use in handouts and presentations. For students: Web links and web activities: Recommended websites related to each chapter guide students to further sources of information each accompanied by a brief overview of how the source can help with their research and thought issue to help think about the underlying issues. -
Genetic Testing
GENETIC TESTING The transcript of a Witness Seminar held by the Wellcome Trust Centre for the History of Medicine at UCL, London, on 13 July 2001 Edited by D A Christie and E M Tansey Volume 17 2003 CONTENTS Illustrations v Introduction Professor Peter Harper vii Acknowledgements ix Witness Seminars: Meetings and publications xi E M Tansey and D A Christie Transcript Edited by D A Christie and E M Tansey 1 References 73 Biographical notes 91 Glossary 105 Index 115 ILLUSTRATIONS Figure 1 Triploid cells in a human embryo, 1961. 20 Figure 2 The use of FISH with DNA probes from the X and Y chromosomes to sex human embryos. 62 v vi INTRODUCTION Genetic testing is now such a widespread and important part of medicine that it is hard to realize that it has almost all emerged during the past 30 years, with most of the key workers responsible for the discoveries and development of the field still living and active. This alone makes it a suitable subject for a Witness Seminar but there are others that increase its value, notably the fact that a high proportion of the critical advances took place in the UK; not just the basic scientific research, but also the initial applications in clinical practice, particularly those involving inherited disorders. To see these topics discussed by the people who were actually involved in their creation makes fascinating reading; for myself it is tinged with regret at having been unable to attend and contribute to the seminar, but with some compensation from being able to look at the contributions more objectively than can a participant. -
IEB at 50: a Scientific Timeline
IEB at 50: a scientific timeline Alcalá de Henares, 12 September 2013, Jonathan Ashmore When the Inner Ear Biochemistry Workshop started in 1964, we knew of giants who had given us some the key ideas. They included Alfonso Corti Robert Barany Georg von Bekesy Halliwell Davis and many others…… What science had happened be fore the workshop started? 1 Elsewhere we had seen the birth of molecular biology “It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying method for the genetic material.” Elsewhere: we had seen the birth of cellular biophysics Alan Hodgkin and Andrew Huxley J. Physiol 1952 2 As Jochen Schact describes, Sigurd Rauch convened the first workshop to enable a research interface between clinicians and biochemists: Sigurd Rauch Invitation: 1st Workshop November 6 & 7, 1964 To be followed in 1965 by a 2nd Workshop on Inner Ear Biochemistry Topics Mucopolysaccharides in the inner ear Inner ear fluids: composition, secretion and absorption Membrane problems : electron microscopy and electrophysiology Ototoxicity: pharmacology and pathology 3 How the 1965 discussions were divided up Mucopolysaccharides Ototoxicity Electrophysiology and electron microscopy Inner ear fluids Timelines : 1964 1st Workshop on Inner Ear Biochemistry 1968 5th Workshop on Inner Ear Biology SfN 1971 ARO 1976 MoH 1980 MBHD 1992 2013 4 How has inner ear biology developed? Here are (some!) enabling technologies 1950s - Electron microscopy 1960s - Recording from nerves and cells (1976 – low noise patch -
The Role of Potassium Recirculation in Cochlear Amplification
The role of potassium recirculation in cochlear amplification Pavel Mistrika and Jonathan Ashmorea,b aUCL Ear Institute and bDepartment of Neuroscience, Purpose of review Physiology and Pharmacology, UCL, London, UK Normal cochlear function depends on maintaining the correct ionic environment for the Correspondence to Jonathan Ashmore, Department of sensory hair cells. Here we review recent literature on the cellular distribution of Neuroscience, Physiology and Pharmacology, UCL, Gower Street, London WC1E 6BT, UK potassium transport-related molecules in the cochlea. Tel: +44 20 7679 8937; fax: +44 20 7679 8990; Recent findings e-mail: [email protected] Transgenic animal models have identified novel molecules essential for normal hearing Current Opinion in Otolaryngology & Head and and support the idea that potassium is recycled in the cochlea. The findings indicate that Neck Surgery 2009, 17:394–399 extracellular potassium released by outer hair cells into the space of Nuel is taken up by supporting cells, that the gap junction system in the organ of Corti is involved in potassium handling in the cochlea, that the gap junction system in stria vascularis is essential for the generation of the endocochlear potential, and that computational models can assist in the interpretation of the systems biology of hearing and integrate the molecular, electrical, and mechanical networks of the cochlear partition. Such models suggest that outer hair cell electromotility can amplify over a much broader frequency range than expected from isolated cell studies. Summary These new findings clarify the role of endolymphatic potassium in normal cochlear function. They also help current understanding of the mechanisms of certain forms of hereditary hearing loss. -
Smutty Alchemy
University of Calgary PRISM: University of Calgary's Digital Repository Graduate Studies The Vault: Electronic Theses and Dissertations 2021-01-18 Smutty Alchemy Smith, Mallory E. Land Smith, M. E. L. (2021). Smutty Alchemy (Unpublished doctoral thesis). University of Calgary, Calgary, AB. http://hdl.handle.net/1880/113019 doctoral thesis University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission. Downloaded from PRISM: https://prism.ucalgary.ca UNIVERSITY OF CALGARY Smutty Alchemy by Mallory E. Land Smith A THESIS SUBMITTED TO THE FACULTY OF GRADUATE STUDIES IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY GRADUATE PROGRAM IN ENGLISH CALGARY, ALBERTA JANUARY, 2021 © Mallory E. Land Smith 2021 MELS ii Abstract Sina Queyras, in the essay “Lyric Conceptualism: A Manifesto in Progress,” describes the Lyric Conceptualist as a poet capable of recognizing the effects of disparate movements and employing a variety of lyric, conceptual, and language poetry techniques to continue to innovate in poetry without dismissing the work of other schools of poetic thought. Queyras sees the lyric conceptualist as an artistic curator who collects, modifies, selects, synthesizes, and adapts, to create verse that is both conceptual and accessible, using relevant materials and techniques from the past and present. This dissertation responds to Queyras’s idea with a collection of original poems in the lyric conceptualist mode, supported by a critical exegesis of that work. -
Making Digit Patterns in the Vertebrate Limb
REVIEWS DEVELOPMENTAL CELL BIOLOGY Making digit patterns in the vertebrate limb Cheryll Tickle Abstract | The vertebrate limb has been a premier model for studying pattern formation — a striking digit pattern is formed in human hands, with a thumb forming at one edge and a little finger at the other. Classic embryological studies in different model organisms combined with new sophisticated techniques that integrate gene-expression patterns and cell behaviour have begun to shed light on the mechanisms that control digit patterning, and stimulate re-evaluation of the current models. Mesenchyme A fundamental biological question is how the body plan is adjacent limb tissue to give a concentration gradient. A loose meshwork of cells laid down during embryonic development and how pre- Cells at different positions across the limb bud would be found in vertebrate embryos, cise arrangements of specialized cells and tissues arise. The exposed to different concentrations of the morphogen which is usually derived from vertebrate limb has a complex anatomy and is an excel- — cells nearest the polarizing region, at the posterior of the mesoderm, the middle lent model in which to address this question. Vertebrate the limb, would be exposed to high concentrations of the of the three germ layers. limbs develop from small buds of apparently homogene- morphogen, whereas cells further away, at the anterior of Ectoderm ous unspecialized mesenchyme cells that are encased in the limb bud, would be exposed to low concentrations. The epithelium that is derived the ectoderm. As the buds grow out from the body wall, Therefore, the local concentration of the morphogen from the outer of the three these unspecialized cells begin to differentiate into various could provide information about position across the germ layers of the embryo and tissues of the limb — including the cartilage and, later in antero–posterior axis.