LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Erweiterte Suche

Suchergebnis

Treffer 1 - 10 von insgesamt 77

Suchoptionen

  1. Buch ; Konferenzbeitrag: Molecular approaches to developmental biology

    Firtel, Richard A.

    proceed. of the Dupont-Genentech UCLA Symposium [Molecular Approaches to Developmental Biology] held at Keystone, Colo., March 30 - April 6, 1986

    (UCLA Symposia on Molecular and Cellular Biology ; N.s.,51)

    1987  

    Körperschaft Symposium Molecular Approaches to Developmental Biology
    Verfasserangabe ed.: Richard A. Firtel
    Serientitel UCLA Symposia on Molecular and Cellular Biology ; N.s.,51
    Überordnung
    Schlagwörter Embryology / congresses ; Molecular Biology / congresses ; Molekularbiologie ; Entwicklungsbiologie
    Schlagwörter Molekulare Biologie
    Umfang XXIV, 695 S. : Ill., graph. Darst.
    Verlag Liss
    Erscheinungsort New York
    Erscheinungsland Vereinigte Staaten
    Dokumenttyp Buch ; Konferenzbeitrag
    HBZ-ID HT003000448
    ISBN 0-8451-2650-4 ; 978-0-8451-2650-9
    Datenquelle Katalog ZB MED Medizin, Gesundheit

    Kategorien

  2. Artikel ; Online: Phosphodiesterase PdeD, dynacortin, and a Kelch repeat-containing protein are direct GSK3 substrates in Dictyostelium that contribute to chemotaxis towards cAMP.

    Baumgardner, Kimberly / Lin, Connie / Firtel, Richard A / Lacal, Jesus

    Environmental microbiology

    2018  Band 20, Heft 5, Seite(n) 1888–1903

    Abstract: The migration of cells according to a diffusible chemical signal in their environment is called chemotaxis, and the slime mold Dictyostelium discoideum is widely used for the study of eukaryotic chemotaxis. Dictyostelium must sense chemicals, such as ... ...

    Abstract The migration of cells according to a diffusible chemical signal in their environment is called chemotaxis, and the slime mold Dictyostelium discoideum is widely used for the study of eukaryotic chemotaxis. Dictyostelium must sense chemicals, such as cAMP, secreted during starvation to move towards the sources of the signal. Previous work demonstrated that the gskA gene encodes the Dictyostelium homologue of glycogen synthase kinase 3 (GSK3), a highly conserved serine/threonine kinase, which plays a major role in the regulation of Dictyostelium chemotaxis. Cells lacking the GskA substrates Daydreamer and GflB exhibited chemotaxis defects less severe than those exhibited by gskA
    Mesh-Begriff(e) 8-Bromo Cyclic Adenosine Monophosphate/analogs & derivatives ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; Chemotaxis/physiology ; Cyclic AMP/metabolism ; Dictyostelium/enzymology ; Gene Expression Regulation ; Glycogen Synthase Kinase 3/metabolism ; Kelch Repeat ; Phosphoric Diester Hydrolases ; Protozoan Proteins/chemistry ; Protozoan Proteins/genetics ; Protozoan Proteins/metabolism ; Signal Transduction/physiology
    Chemische Substanzen Cell Cycle Proteins ; Protozoan Proteins ; dct protein, Dictyostelium discoideum ; 8-Bromo Cyclic Adenosine Monophosphate (23583-48-4) ; 8-chloro-cyclic adenosine monophosphate (BQ94Z7E5OR) ; Cyclic AMP (E0399OZS9N) ; Glycogen Synthase Kinase 3 (EC 2.7.11.26) ; Phosphoric Diester Hydrolases (EC 3.1.4.-)
    Sprache Englisch
    Erscheinungsdatum 2018-04-06
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2020213-1
    ISSN 1462-2920 ; 1462-2912
    ISSN (online) 1462-2920
    ISSN 1462-2912
    DOI 10.1111/1462-2920.14126
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  3. Artikel ; Online: Adaptation in a eukaryotic pathway: combining experiments with modeling.

    Rappel, Wouter-Jan / Firtel, Richard A

    Cell cycle (Georgetown, Tex.)

    2012  Band 11, Heft 6, Seite(n) 1051–1052

    Sprache Englisch
    Erscheinungsdatum 2012-03-15
    Erscheinungsland United States
    Dokumenttyp Comment ; Editorial ; Research Support, N.I.H., Extramural
    ZDB-ID 2146183-1
    ISSN 1551-4005 ; 1538-4101 ; 1554-8627
    ISSN (online) 1551-4005
    ISSN 1538-4101 ; 1554-8627
    DOI 10.4161/cc.11.6.19715
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  4. Artikel ; Online: The Dictyostelium GSK3 kinase GlkA coordinates signal relay and chemotaxis in response to growth conditions.

    Lacal Romero, Jesus / Shen, Zhouxin / Baumgardner, Kimberly / Wei, Jing / Briggs, Steven P / Firtel, Richard A

    Developmental biology

    2018  Band 435, Heft 1, Seite(n) 56–72

    Abstract: GSK3 plays a central role in orchestrating key biological signaling pathways, including cell migration. Here, we identify GlkA as a GSK3 family kinase with functions that overlap with and are distinct from those of GskA. We show that GlkA, as previously ... ...

    Abstract GSK3 plays a central role in orchestrating key biological signaling pathways, including cell migration. Here, we identify GlkA as a GSK3 family kinase with functions that overlap with and are distinct from those of GskA. We show that GlkA, as previously shown for GskA, regulates the cell's cytoskeleton through MyoII assembly and control of Ras and Rap1 function, leading to aberrant cell migration. However, there are both qualitative and quantitative differences in the regulation of Ras and Rap1 and their downstream effectors, including PKB, PKBR1, and PI3K, with glkA
    Mesh-Begriff(e) Chemotaxis/physiology ; Dictyostelium/enzymology ; Dictyostelium/genetics ; Gene Expression Regulation, Enzymologic/physiology ; Glycogen Synthase Kinase 3/biosynthesis ; Glycogen Synthase Kinase 3/genetics ; Protozoan Proteins/biosynthesis ; Protozoan Proteins/genetics ; Signal Transduction/physiology
    Chemische Substanzen Protozoan Proteins ; Glycogen Synthase Kinase 3 (EC 2.7.11.26)
    Sprache Englisch
    Erscheinungsdatum 2018--01
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1114-9
    ISSN 1095-564X ; 0012-1606
    ISSN (online) 1095-564X
    ISSN 0012-1606
    DOI 10.1016/j.ydbio.2018.01.007
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  5. Artikel ; Online: Connecting G protein signaling to chemoattractant-mediated cell polarity and cytoskeletal reorganization.

    Liu, Youtao / Lacal, Jesus / Firtel, Richard A / Kortholt, Arjan

    Small GTPases

    2016  Band 9, Heft 4, Seite(n) 360–364

    Abstract: The directional movement toward extracellular chemical gradients, a process called chemotaxis, is an important property of cells. Central to eukaryotic chemotaxis is the molecular mechanism by which chemoattractant-mediated activation of G-protein ... ...

    Abstract The directional movement toward extracellular chemical gradients, a process called chemotaxis, is an important property of cells. Central to eukaryotic chemotaxis is the molecular mechanism by which chemoattractant-mediated activation of G-protein coupled receptors (GPCRs) induces symmetry breaking in the activated downstream signaling pathways. Studies with mainly Dictyostelium and mammalian neutrophils as experimental systems have shown that chemotaxis is mediated by a complex network of signaling pathways. Recently, several labs have used extensive and efficient proteomic approaches to further unravel this dynamic signaling network. Together these studies showed the critical role of the interplay between heterotrimeric G-protein subunits and monomeric G proteins in regulating cytoskeletal rearrangements during chemotaxis. Here we highlight how these proteomic studies have provided greater insight into the mechanisms by which the heterotrimeric G protein cycle is regulated, how heterotrimeric G proteins-induced symmetry breaking is mediated through small G protein signaling, and how symmetry breaking in G protein signaling subsequently induces cytoskeleton rearrangements and cell migration.
    Mesh-Begriff(e) Animals ; Cell Polarity ; Chemotaxis ; Cytoskeleton/metabolism ; GTP-Binding Proteins/metabolism ; Humans
    Chemische Substanzen GTP-Binding Proteins (EC 3.6.1.-)
    Sprache Englisch
    Erscheinungsdatum 2016-10-14
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2682247-7
    ISSN 2154-1256 ; 2154-1248
    ISSN (online) 2154-1256
    ISSN 2154-1248
    DOI 10.1080/21541248.2016.1235390
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  6. Artikel ; Online: "TORCing" neutrophil chemotaxis.

    Charest, Pascale G / Firtel, Richard A

    Developmental cell

    2010  Band 19, Heft 6, Seite(n) 795–796

    Abstract: During cell migration, chemoattractant-induced signaling pathways determine the direction of movement by controlling the spatiotemporal dynamics of cytoskeletal components. In this issue of Developmental Cell, Liu et al. report that the target of ... ...

    Abstract During cell migration, chemoattractant-induced signaling pathways determine the direction of movement by controlling the spatiotemporal dynamics of cytoskeletal components. In this issue of Developmental Cell, Liu et al. report that the target of rapamycin complex 2 (TORC2) controls cell polarity and chemotaxis through regulation of both F-actin and myosin II in migrating neutrophils.
    Sprache Englisch
    Erscheinungsdatum 2010-12-08
    Erscheinungsland United States
    Dokumenttyp Comment ; Journal Article
    ZDB-ID 2054967-2
    ISSN 1878-1551 ; 1534-5807
    ISSN (online) 1878-1551
    ISSN 1534-5807
    DOI 10.1016/j.devcel.2010.11.017
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  7. Artikel ; Online: Spatiotemporal regulation of Ras-GTPases during chemotaxis.

    Sasaki, Atsuo T / Firtel, Richard A

    Methods in molecular biology (Clifton, N.J.)

    2009  Band 571, Seite(n) 333–348

    Abstract: Many eukaryotic cells can elicit intracellular signaling relays to produce pseudopodia and move up to the chemoattractant gradient (chemotaxis) or move randomly in the absence of extracellular stimuli and nutrients (random movement). A precise ... ...

    Abstract Many eukaryotic cells can elicit intracellular signaling relays to produce pseudopodia and move up to the chemoattractant gradient (chemotaxis) or move randomly in the absence of extracellular stimuli and nutrients (random movement). A precise spatiotemporal regulation of Ras-GTPases, such as Ras and Rap, is crucial to induce pseudopodia formation and cellular adhesion during the chemotaxis and random movement. Here, we describe biochemical and real-time imaging methods for using Dictyostelium to understand the signaling events important for chemotaxis and random cell movement. The chapter includes (1) a biochemical method to assess Ras and Rap1 activation in response to chemoattractant, (2) an imaging method to detect endogenous Ras and Rap1 activation in moving cells, and (3) a simultaneous imaging method to decipher the precise order and localization of these signaling events. With a combination of powerful Dictyostelium genetics, these methods will facilitate to elucidate a dynamic activation of Ras proteins and their inter relay with other signaling molecules during chemotaxis and random movement.
    Mesh-Begriff(e) Animals ; Chemotactic Factors/pharmacology ; Chemotaxis/physiology ; Dictyostelium/drug effects ; Dictyostelium/enzymology ; Dictyostelium/metabolism ; GTP Phosphohydrolases/genetics ; GTP Phosphohydrolases/metabolism ; Protozoan Proteins/genetics ; Protozoan Proteins/metabolism ; rap1 GTP-Binding Proteins/genetics ; rap1 GTP-Binding Proteins/metabolism ; ras Proteins/genetics ; ras Proteins/metabolism
    Chemische Substanzen Chemotactic Factors ; Protozoan Proteins ; GTP Phosphohydrolases (EC 3.6.1.-) ; rap1 GTP-Binding Proteins (EC 3.6.5.2) ; ras Proteins (EC 3.6.5.2)
    Sprache Englisch
    Erscheinungsdatum 2009
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S.
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-60761-198-1_23
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  8. Artikel: Directional sensing during chemotaxis.

    Janetopoulos, Christopher / Firtel, Richard A

    FEBS letters

    2008  Band 582, Heft 14, Seite(n) 2075–2085

    Abstract: Cells have the innate ability to sense and move towards a variety of chemoattractants. We investigate the pathways by which cells sense and respond to chemoattractant gradients. We focus on the model system Dictyostelium and compare our understanding of ... ...

    Abstract Cells have the innate ability to sense and move towards a variety of chemoattractants. We investigate the pathways by which cells sense and respond to chemoattractant gradients. We focus on the model system Dictyostelium and compare our understanding of chemotaxis in this system with recent advances made using neutrophils and other mammalian cell types, which share many molecular components and signaling pathways with Dictyostelium. This review also examines models that have been proposed to explain how cells are able to respond to small differences in ligand concentrations between the anterior leading edge and posterior of the cell. In addition, we highlight the overlapping functions of many signaling components in diverse processes beyond chemotaxis, including random cell motility and cell division.
    Mesh-Begriff(e) Animals ; Cell Division ; Chemotactic Factors/metabolism ; Chemotaxis ; Dictyostelium/metabolism ; Dictyostelium/physiology ; Feedback, Physiological ; Humans ; Mice ; Microtubules/physiology ; Models, Animal ; Phosphatidylinositols/metabolism ; Signal Transduction
    Chemische Substanzen Chemotactic Factors ; Phosphatidylinositols ; phosphoinositide-3,4,5-triphosphate
    Sprache Englisch
    Erscheinungsdatum 2008-04-29
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 212746-5
    ISSN 1873-3468 ; 0014-5793
    ISSN (online) 1873-3468
    ISSN 0014-5793
    DOI 10.1016/j.febslet.2008.04.035
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  9. Artikel ; Online: Cooperative cell motility during tandem locomotion of amoeboid cells.

    Bastounis, Effie / Álvarez-González, Begoña / del Álamo, Juan C / Lasheras, Juan C / Firtel, Richard A

    Molecular biology of the cell

    2016  Band 27, Heft 8, Seite(n) 1262–1271

    Abstract: Streams of migratory cells are initiated by the formation of tandem pairs of cells connected head to tail to which other cells subsequently adhere. The mechanisms regulating the transition from single to streaming cell migration remain elusive, although ... ...

    Abstract Streams of migratory cells are initiated by the formation of tandem pairs of cells connected head to tail to which other cells subsequently adhere. The mechanisms regulating the transition from single to streaming cell migration remain elusive, although several molecules have been suggested to be involved. In this work, we investigate the mechanics of the locomotion ofDictyosteliumtandem pairs by analyzing the spatiotemporal evolution of their traction adhesions (TAs). We find that in migrating wild-type tandem pairs, each cell exerts traction forces on stationary sites (∼80% of the time), and the trailing cell reuses the location of the TAs of the leading cell. Both leading and trailing cells form contractile dipoles and synchronize the formation of new frontal TAs with ∼54-s time delay. Cells not expressing the lectin discoidin I or moving on discoidin I-coated substrata form fewer tandems, but the trailing cell still reuses the locations of the TAs of the leading cell, suggesting that discoidin I is not responsible for a possible chemically driven synchronization process. The migration dynamics of the tandems indicate that their TAs' reuse results from the mechanical synchronization of the leading and trailing cells' protrusions and retractions (motility cycles) aided by the cell-cell adhesions.
    Mesh-Begriff(e) Biomechanical Phenomena ; Cell Adhesion ; Cell Adhesion Molecules/genetics ; Cell Adhesion Molecules/metabolism ; Cell Movement/physiology ; Dictyostelium/cytology ; Dictyostelium/genetics ; Discoidins/genetics ; Discoidins/metabolism
    Chemische Substanzen Cell Adhesion Molecules ; Discoidins
    Sprache Englisch
    Erscheinungsdatum 2016-04-15
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1098979-1
    ISSN 1939-4586 ; 1059-1524
    ISSN (online) 1939-4586
    ISSN 1059-1524
    DOI 10.1091/mbc.E15-12-0836
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  10. Artikel ; Online: Big roles for small GTPases in the control of directed cell movement.

    Charest, Pascale G / Firtel, Richard A

    The Biochemical journal

    2007  Band 401, Heft 2, Seite(n) 377–390

    Abstract: Small GTPases are involved in the control of diverse cellular behaviours, including cellular growth, differentiation and motility. In addition, recent studies have revealed new roles for small GTPases in the regulation of eukaryotic chemotaxis. Efficient ...

    Abstract Small GTPases are involved in the control of diverse cellular behaviours, including cellular growth, differentiation and motility. In addition, recent studies have revealed new roles for small GTPases in the regulation of eukaryotic chemotaxis. Efficient chemotaxis results from co-ordinated chemoattractant gradient sensing, cell polarization and cellular motility, and accumulating data suggest that small GTPase signalling plays a central role in each of these processes as well as in signal relay. The present review summarizes these recent findings, which shed light on the molecular mechanisms by which small GTPases control directed cell migration.
    Mesh-Begriff(e) Actins/metabolism ; Animals ; Cell Movement/physiology ; Cell Polarity/physiology ; Chemotaxis/physiology ; GTP Phosphohydrolases/physiology ; GTP-Binding Proteins/physiology ; Guanine Nucleotide Exchange Factors/physiology ; Microtubules/drug effects ; Microtubules/physiology ; Myosins/metabolism ; PTEN Phosphohydrolase/metabolism ; Phosphatidylinositol 3-Kinases/metabolism ; Signal Transduction/physiology ; ras Proteins/physiology
    Chemische Substanzen Actins ; Guanine Nucleotide Exchange Factors ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; PTEN Phosphohydrolase (EC 3.1.3.67) ; GTP Phosphohydrolases (EC 3.6.1.-) ; GTP-Binding Proteins (EC 3.6.1.-) ; Myosins (EC 3.6.4.1) ; ras Proteins (EC 3.6.5.2)
    Sprache Englisch
    Erscheinungsdatum 2007-01-15
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 2969-5
    ISSN 1470-8728 ; 0006-2936 ; 0306-3275 ; 0264-6021
    ISSN (online) 1470-8728
    ISSN 0006-2936 ; 0306-3275 ; 0264-6021
    DOI 10.1042/BJ20061432
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

Zum Seitenanfang