Establishing And Maintaining Cell Polarity Book PDFs/Epub
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Author : Benjamin Lin
Category : Science
Publisher : Frontiers Media SA
Published : 2021-12-22
Type : PDF & EPUB
Page : 125
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Author : Keith E. Mostov
Category : Science
Publisher : Perspectives Cshl
Published : 2017
Type : PDF & EPUB
Page : 0
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Description: Most animal cells are polarized, with structurally and functionally distinct regions. This polarization facilitates processes such as differentiation and morphogenesis, directional cell migration, nerve impulse transmission, and transport of molecules across tissues. The dysregulation of these processes can lead to developmental disorders and is a feature of many cancers. Written and edited by experts in the field, this collection from Cold Spring Harbor Perspectives in Biology reviews our understanding of the molecular mechanisms involved in establishing and maintaining cell polarity, as well as their relevance for human disorders. Contributors discuss how cells coordinate signaling pathways, membrane trafficking, and cytoskeletal remodeling to ensure proper spatial arrangement of cellular components. Processes such as transcytosis, exocyst-mediated vesicle trafficking, and endosomal sorting are covered in detail. Throughout, the focus is on epithelial cells and how polarity mechanisms facilitate the development of their apical and basolateral surfaces, tube formation (e.g., in blood vessel development), exchange of waste and nutrients, and the generation and maintenance of specialized structures at the cell surface (e.g., cilia). The authors also describe the polarity mechanisms involved in collective cell migration, a phenomenon seen during morphogenesis and cancer metastasis. This volume will thus be essential reading for all cell and developmental biologists, as well as those interested in how cell polarity processes impact human health and disease.
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Author : Yan Gong (Researcher in molecular biology)
Category :
Publisher :
Published : 2021
Type : PDF & EPUB
Page :
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Description: Cell polarity features the asymmetric distribution of molecules and structures. The establishment of cell polarity allows cells to spatially organize diverse cellular processes, including orienting cell division planes, assuring directional transport of nutrients and hormones, and determining cell morphology and fate. In both animals and plants, cell polarity is established and maintained by so-called "polarity proteins", whose subcellular localization is markedly asymmetric. Precision in the polar localization pattern of polarity proteins, in both space and time, is crucial for the development and functions of the hosting cells. In the past two decades, many polarity proteins have been identified; the cellular functions of most of these polarity proteins, however, remain to be determined. In the stomatal lineage of Arabidopsis thaliana, polarity proteins BASL (BREAKING OF ASYMMETRY IN THE STOMATAL LINEAGE) and BRXf (the protein family of BREVIS RADIX) interact and polarly localize to a fraction of the membrane before the onset of an asymmetric cell division (ACD). How BASL and BRXf achieve and maintain their striking polarity and how the dynamics of their polarity in different stages of ACD are connected to their functions are largely unknown. In this dissertation, I combine long-term live imaging, quantitative image analysis, genetics, and developmental biology approaches to explore different avenues of BASL/BRXf polarity and the connections of their polarity to their functions in regulating ACD, thereby providing a mechanistic view of cell polarity and ACD regulations in plants.
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Author : Froylan Calderon de Anda
Category :
Publisher : Frontiers Media SA
Published : 2018-07-12
Type : PDF & EPUB
Page : 172
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Description: The term polarity in a biological context is used to describe an asymmetry in morphology and distribution of molecules. In neurons, their complex shape with typically one axon and several dendrites reflects this asymmetry. Although neurons assume many different shapes and sizes they always maintain these two domains, which are essential for neuronal function. In the most simple view, neurons use their axon to transmit signals over long distances due to its capacity to extend to enormous lengths. Dendrites, on the other hand, are shorter and receive and integrate signals from different locations. The selection of the site where the axon and dendrites initially emerge during embryonic development is a tightly regulated event, eventually important for the correct formation of neuronal circuits, and disturbances of these processes can have pathological consequences due to circuit malformation. An important question is which mechanisms neurons utilize to specify the sites where axonal and dendrite outgrowth occurs and how their identities are maintained during and after development. The formation of these functionally diverse domains is the result of polarized differences of membrane and protein delivery, mitochondria transport, actin dynamics and microtubule stability. However how and in which temporal order all those events which coordinate the selection and maintenance of axons and dendrites is still under investigation. This selection of articles shall highlight new findings, which help to unravel all molecular and cellular events important for neuronal polarity establishment and maintenance.
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Author : J.R. Bartles
Category : Science
Publisher : Elsevier
Published : 1998-08-25
Type : PDF & EPUB
Page : 258
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Description: Few cells conform to the stereotype of the spherical blob hastily scribbled on chalkboards and, regrettably, sometimes even displayed prominently in textbooks. Instead, real cells display a remarkable degree of structural and functional asymmetry. In modern cell biological parlance, this asymmetry has come to be lumped under the general heading of "cell polarity". Cell polarity is by no means restricted to the cells of tissues and organs, but can also be displayed by cells that lead a more solitary existence. The amazing extent to which cell morphology is correlated with function has long been a source of inspiration for biologists. Today the fascination continues unabated in the field of cell polarity, where it is fueled by an ever-deepening appreciation for the ways that fundamental cellular processes, such as membrane trafficking and cytoskeleton assembly, contribute to the establishment and maintenance of cell polarity. In the ensuing chapters, a collection of experts will summarize and interpret the findings obtained from basic research on cell polarity in a diverse array of experimental systems.
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Author : Peter D. Vize
Category : Science
Publisher : Elsevier
Published : 2003-03-14
Type : PDF & EPUB
Page : 592
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Description: Organogenesis of the kidney has been intensely studied for over a century. In recent years advances in molecular techniques have not only made great inroads into exploring the genetic regulation of this complex process but also began to unravel the molecular basis of many forms of congenital kidney disease. This book is a comprehensive study on these findings and the only book available with such in depth coverage of the kidney. Hundreds of color figures depicting key events in all aspects of kidney development Full coverage of the genetic and cellular basis of kidney development Analysis of the genetic basis of the major congenital kidney diseases
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Author : Holden Richard Higginbotham
Category :
Publisher :
Published : 2008
Type : PDF & EPUB
Page : 172
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Description: A key requirement of normal brain development is that during their proliferation, migration and differentiation precursors and daughter neurons establish and maintain a specific cell polarity, defined as having one or more axes of symmetry. Cell polarization divides the cell into different functional domains and facilitates the orientation of neurons within the overall brain framework, allowing functional connections to be established. In this dissertation I will describe work I have performed to address the question of how cell polarity is regulated during neuron migration and differentiation. I will address how the cytoskeleton and cell polarity are dynamically regulated in migrating neurons of the embryonic and adult forebrain. Specifically, I will investigate how the position of the centrosome is regulated in response to guidance cues in tangentially migrating neurons. To visualize the centrosome I have generated a transgenic mouse line that expresses a GFP-tagged centrosomal protein. In vitro studies were conducted using tangentially migrating neurons from postnatal transgenic mice to determine what molecules regulate the centrosome's position. I found that the polarity molecules GSK-3[Beta] and aPKC[Xi] regulate the centrosome's position and that repolarization in response to guidance cues depends the activity of these factors. Additionally, I analyze centrosomal position during radial migration in the embryonic cortex and report on the effect of disrupting polarity factors during migration. Next I report on the role of the microtubule-associated protein Doublecortin (DCX) in tangentially migrating neurons and show that loss of DCX results in inefficient consolidation of a single leading process during migration. Lastly, I show that during radial migration in embryogenesis, DCX cooperates with its gene-family member DCK1 to exit the multipolar stage of migration and assume a bipolar morphology.
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Author : Charles F. Streckfus
Category : Medical
Publisher : Springer
Published : 2015-02-03
Type : PDF & EPUB
Page : 204
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Description: This book reviews the progress made in salivary diagnostics during the past two decades and identifies the likely direction of future endeavors. After an introductory section describing the histological and anatomical features of the salivary glands and salivary function, salivary collection devices and diagnostic platforms are reviewed. The field of “salivaomics” is then considered in detail, covering, for example, proteomics, the peptidome, DNA and RNA analysis, biomarkers, and methods for biomarker discovery. Salivary diagnostics for oral and systemic diseases are thoroughly discussed, and the role of salivary gland tissue engineering for future diagnostics is explored. The book closes by considering legal issues and barriers to salivary diagnostic development. Advances in Salivary Diagnostics will be an informative and stimulating reference for both practitioners and students.
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Author :
Category :
Publisher :
Published : 2005
Type : PDF & EPUB
Page : 158
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Description: The establishment and maintenance of cell polarity during development is an active process that requires specific protein sorting and targeting to apical and basolateral regions of the cell. Our lab has identified an apical early endosomal marker, endotubin, in developing rat intestine, which we have used to label specialized apical endosomal tubules, and to probe for components of the apical sorting machinery. Studies with endotubin have implicated the small GTPase Rab14 as part of the sorting machinery for apical targeting. The current work pursues further study of the interaction between Rab14 and endotubin, as well as the role for Rab14 in the establishment of cell asymmetry. Interestingly, even nonpolarized cells may utilize polarized trafficking components for proper sorting and dynamics of endotubin.
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Author : Marc H. Symons
Category : Science
Publisher : Springer Science & Business Media
Published : 2004-05-31
Type : PDF & EPUB
Page : 256
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Description: Members of the Rho family of small GTP-binding proteins (GTPases) are key signal transduction proteins that mediate signals initiated by growth factors, cytokines and cell adhesion proteins. Our knowledge about Rho GTPases has rapidly expanded over the past several years and Rho GTPases is the first book to provide a comprehensive overview of the regulation and functions of this important class of proteins. This book includes several chapters dedicated to the review of various classes of proteins that control the localization and activation state of Rho GTPases. Additional chapters discuss the wide range of biological functions that are controlled by Rho GTPases, including the organization of the actin cytoskeleton, cell proliferation and cell motility. Rho GTPases is essential reading for cell and molecular biologists, biochemists and geneticists. The critical roles of Rho family members in cancer and inflammatory diseases makes Rho GTPases also an invaluable guide for clinical investigators and pharmacologists.