LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 23

Search options

  1. Article ; Online: WISp39 and Hsp90: actin' together in cell migration.

    Fotedar, Rati / Margolis, Robert L

    Oncotarget

    2015  Volume 6, Issue 20, Page(s) 17871–17872

    MeSH term(s) Actin Cytoskeleton/metabolism ; Actins/metabolism ; Animals ; Cell Movement ; HSP90 Heat-Shock Proteins/metabolism ; Humans ; Immunophilins/metabolism ; Protein Binding ; Signal Transduction
    Chemical Substances Actins ; FKBPL protein, human ; HSP90 Heat-Shock Proteins ; Immunophilins (EC 5.2.1.8)
    Language English
    Publishing date 2015-07-20
    Publishing country United States
    Document type Editorial
    ZDB-ID 2560162-3
    ISSN 1949-2553 ; 1949-2553
    ISSN (online) 1949-2553
    ISSN 1949-2553
    DOI 10.18632/oncotarget.4934
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Obituary

    Margolis Robert L / Fotedar Rati

    Cell Division, Vol 2, Iss 1, p

    Arun Fotedar

    2007  Volume 29

    Keywords Cytology ; QH573-671 ; Biology (General) ; QH301-705.5 ; Science ; Q ; DOAJ:Cytology ; DOAJ:Biology ; DOAJ:Biology and Life Sciences
    Language English
    Publishing date 2007-10-01T00:00:00Z
    Publisher BioMed Central
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  3. Article ; Online: Obituary: arun fotedar.

    Fotedar, Rati / Margolis, Robert L

    Cell division

    2007  Volume 2, Page(s) 29

    Language English
    Publishing date 2007-10-02
    Publishing country England
    Document type Editorial
    ISSN 1747-1028
    ISSN (online) 1747-1028
    DOI 10.1186/1747-1028-2-29
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Glioblastoma motility occurs in the absence of actin polymer.

    Panopoulos, Andreas / Howell, Michael / Fotedar, Rati / Margolis, Robert L

    Molecular biology of the cell

    2011  Volume 22, Issue 13, Page(s) 2212–2220

    Abstract: In fibroblasts and keratocytes, motility is actin dependent, while microtubules play a secondary role, providing directional guidance. We demonstrate here that the motility of glioblastoma cells is exceptional, in that it occurs in cells depleted of ... ...

    Abstract In fibroblasts and keratocytes, motility is actin dependent, while microtubules play a secondary role, providing directional guidance. We demonstrate here that the motility of glioblastoma cells is exceptional, in that it occurs in cells depleted of assembled actin. Cells display persistent motility in the presence of actin inhibitors at concentrations sufficient to fully disassemble actin. Such actin independent motility is characterized by the extension of cell protrusions containing abundant microtubule polymers. Strikingly, glioblastoma cells exhibit no motility in the presence of microtubule inhibitors, at concentrations that disassemble labile microtubule polymers. In accord with an unconventional mode of motility, glioblastoma cells have some unusual requirements for the Rho GTPases. While Rac1 is required for lamellipodial protrusions in fibroblasts, expression of dominant negative Rac1 does not suppress glioblastoma migration. Other GTPase mutants are largely without unique effect, except dominant positive Rac1-Q61L, and rapidly cycling Rac1-F28L, which substantially suppress glioblastoma motility. We conclude that glioblastoma cells display an unprecedented mode of intrinsic motility that can occur in the absence of actin polymer, and that appears to require polymerized microtubules.
    MeSH term(s) Actins/metabolism ; Cell Movement/physiology ; Fibroblasts/metabolism ; Glioblastoma/metabolism ; Glioblastoma/pathology ; Humans ; Microtubules/metabolism ; Mutation ; Polymerization ; Pseudopodia/metabolism ; Tumor Cells, Cultured ; rac1 GTP-Binding Protein/metabolism ; rho GTP-Binding Proteins/metabolism
    Chemical Substances Actins ; rac1 GTP-Binding Protein (EC 3.6.5.2) ; rho GTP-Binding Proteins (EC 3.6.5.2)
    Language English
    Publishing date 2011-05-05
    Publishing country United States
    Document type 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.E10-10-0849
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: TD-60 is required for interphase cell cycle progression.

    Yenjerla, Mythili / Panopoulos, Andreas / Reynaud, Caroline / Fotedar, Rati / Margolis, Robert L

    Cell cycle (Georgetown, Tex.)

    2013  Volume 12, Issue 5, Page(s) 837–841

    Abstract: We previously identified TD-60 (RCC2) as a mitotic centromere-associated protein that is necessary for proper completion of mitosis. We now report that TD-60 is an essential regulator of cell cycle progression during interphase. siRNA suppression blocks ... ...

    Abstract We previously identified TD-60 (RCC2) as a mitotic centromere-associated protein that is necessary for proper completion of mitosis. We now report that TD-60 is an essential regulator of cell cycle progression during interphase. siRNA suppression blocks progression of mammalian G₁/S phase cells and progression of G₂ cells into mitosis. Prolonged arrest occurs both in non-transformed cells and in transformed cells lacking functional p53. TD-60 associates with Rac1 and Arf6 and has recently been demonstrated to be an element of α5β1 integrin and cortactin interactomes. These associations with known elements of cell cycle control, together with our data, suggest that TD-60 is an essential component of one or more signaling pathways that drive cell cycle progression. During mitosis, TD-60 is required for correct assembly of the mitotic spindle and activation of key mitotic proteins. In contrast, in interphase TD-60 promotes cell cycle progression through what must be distinct mechanisms. TD-60 thus appears to be one of the growing categories of proteins that "moonlight," or have more than one distinct cellular function.
    MeSH term(s) Chromosomal Proteins, Non-Histone/metabolism ; Gene Knockdown Techniques ; Guanine Nucleotide Exchange Factors/metabolism ; HeLa Cells ; Humans ; Interphase ; Mitosis ; RNA, Small Interfering/metabolism ; Transfection
    Chemical Substances Chromosomal Proteins, Non-Histone ; Guanine Nucleotide Exchange Factors ; RCC2 protein, human ; RNA, Small Interfering
    Language English
    Publishing date 2013-02-06
    Publishing country United States
    Document type Journal Article ; 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.23821
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Substrate degradation by the anaphase promoting complex occurs during mitotic slippage.

    Lee, Jinho / Kim, Jin Ah / Margolis, Robert L / Fotedar, Rati

    Cell cycle (Georgetown, Tex.)

    2010  Volume 9, Issue 9, Page(s) 1792–1801

    Abstract: Microtubule targeting drugs are successful in chemotherapy because they indefinitely activate the spindle assembly checkpoint. The spindle assembly checkpoint monitors proper attachment of all kinetochores to microtubules and tension between the ... ...

    Abstract Microtubule targeting drugs are successful in chemotherapy because they indefinitely activate the spindle assembly checkpoint. The spindle assembly checkpoint monitors proper attachment of all kinetochores to microtubules and tension between the kinetochores of sister chromatids to prevent premature anaphase entry. To this end, the activated spindle assembly checkpoint suppresses the E3 ubiquitin ligase activity of the anaphase-promoting complex (APC). In the continued presence of conditions that activate the spindle assembly checkpoint, cells eventually escape from mitosis by "slippage". It has not been directly tested whether APC activation accompanies slippage. Using cells blocked in mitosis with the microtubule assembly inhibitor nocodazole, we show that mitotic APC substrates are degraded upon mitotic slippage. To confirm that APC is normally activated upon mitotic slippage we have found that knockdown of Cdc20 and Cdh1, two mitotic activators of APC, prevents the degradation of APC substrates during mitotic slippage. We provide the first direct demonstration that despite conditions that activate the spindle checkpoint, APC is indeed activated upon mitotic slippage of cells to interphase cells. Activation of the spindle checkpoint by microtubule targeting drugs used in chemotherapy may not indefinitely prevent APC activation.
    MeSH term(s) Anaphase-Promoting Complex-Cyclosome ; Antigens, CD ; Antineoplastic Agents/pharmacology ; Cadherins/genetics ; Cadherins/metabolism ; Cdc20 Proteins ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; G1 Phase ; Gene Knockdown Techniques ; HCT116 Cells ; Humans ; Mitosis ; Nocodazole/pharmacology ; S Phase ; Spindle Apparatus/metabolism ; Substrate Specificity ; Ubiquitin-Protein Ligase Complexes/metabolism ; Ubiquitin-Protein Ligases/metabolism
    Chemical Substances Antigens, CD ; Antineoplastic Agents ; CDH1 protein, human ; Cadherins ; Cdc20 Proteins ; Cell Cycle Proteins ; CDC20 protein, human (156288-95-8) ; Ubiquitin-Protein Ligase Complexes (EC 2.3.2.23) ; Anaphase-Promoting Complex-Cyclosome (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27) ; Nocodazole (SH1WY3R615)
    Language English
    Publishing date 2010-05-10
    Publishing country United States
    Document type Journal Article ; 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.9.9.11519
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) triggers MSH2 and Cdt2 protein-dependent degradation of the cell cycle and mismatch repair (MMR) inhibitor protein p21Waf1/Cip1.

    Jascur, Thomas / Fotedar, Rati / Greene, Serena / Hotchkiss, Erin / Boland, C Richard

    The Journal of biological chemistry

    2011  Volume 286, Issue 34, Page(s) 29531–29539

    Abstract: p21(Waf1/Cip1) protein levels respond to DNA damage; p21 is induced after ionizing radiation, but degraded after UV. p21 degradation after UV is necessary for optimal DNA repair, presumably because p21 inhibits nucleotide excision repair by blocking ... ...

    Abstract p21(Waf1/Cip1) protein levels respond to DNA damage; p21 is induced after ionizing radiation, but degraded after UV. p21 degradation after UV is necessary for optimal DNA repair, presumably because p21 inhibits nucleotide excision repair by blocking proliferating cell nuclear antigen (PCNA). Because p21 also inhibits DNA mismatch repair (MMR), we investigated how p21 levels respond to DNA alkylation by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), which triggers the MMR system. We show that MNNG caused rapid degradation of p21, and this involved the ubiquitin ligase Cdt2 and the proteasome. p21 degradation further required MSH2 but not MLH1. p21 mutants that cannot bind PCNA or cannot be ubiquitinated were resistant to MNNG. MNNG induced the formation of PCNA complexes with MSH6 and Cdt2. Finally, when p21 degradation was blocked, MNNG treatment resulted in reduced recruitment of MMR proteins to chromatin. This study describes a novel pathway that removes p21 to allow cells to efficiently activate the MMR system.
    MeSH term(s) Adaptor Proteins, Signal Transducing/genetics ; Adaptor Proteins, Signal Transducing/metabolism ; Chromatin/genetics ; Chromatin/metabolism ; Cyclin-Dependent Kinase Inhibitor p21/genetics ; Cyclin-Dependent Kinase Inhibitor p21/metabolism ; DNA Damage/drug effects ; DNA Damage/physiology ; DNA Repair/drug effects ; DNA Repair/physiology ; HeLa Cells ; Humans ; Methylnitronitrosoguanidine/pharmacology ; MutL Protein Homolog 1 ; MutS Homolog 2 Protein/genetics ; MutS Homolog 2 Protein/metabolism ; Nuclear Proteins/genetics ; Nuclear Proteins/metabolism ; Proliferating Cell Nuclear Antigen/genetics ; Proliferating Cell Nuclear Antigen/metabolism ; Proteasome Endopeptidase Complex/genetics ; Proteasome Endopeptidase Complex/metabolism ; Ubiquitin-Protein Ligases/genetics ; Ubiquitin-Protein Ligases/metabolism ; Ubiquitination/drug effects ; Ubiquitination/physiology
    Chemical Substances Adaptor Proteins, Signal Transducing ; CDKN1A protein, human ; Chromatin ; Cyclin-Dependent Kinase Inhibitor p21 ; DTL protein, human ; MLH1 protein, human ; Nuclear Proteins ; Proliferating Cell Nuclear Antigen ; Methylnitronitrosoguanidine (12H3O2UGSF) ; Ubiquitin-Protein Ligases (EC 2.3.2.27) ; Proteasome Endopeptidase Complex (EC 3.4.25.1) ; MSH2 protein, human (EC 3.6.1.3) ; MutL Protein Homolog 1 (EC 3.6.1.3) ; MutS Homolog 2 Protein (EC 3.6.1.3)
    Language English
    Publishing date 2011-07-02
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.M111.221341
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Failure of cell cleavage induces senescence in tetraploid primary cells.

    Panopoulos, Andreas / Pacios-Bras, Cristina / Choi, Justin / Yenjerla, Mythili / Sussman, Mark A / Fotedar, Rati / Margolis, Robert L

    Molecular biology of the cell

    2014  Volume 25, Issue 20, Page(s) 3105–3118

    Abstract: Tetraploidy can arise from various mitotic or cleavage defects in mammalian cells, and inheritance of multiple centrosomes induces aneuploidy when tetraploid cells continue to cycle. Arrest of the tetraploid cell cycle is therefore potentially a critical ...

    Abstract Tetraploidy can arise from various mitotic or cleavage defects in mammalian cells, and inheritance of multiple centrosomes induces aneuploidy when tetraploid cells continue to cycle. Arrest of the tetraploid cell cycle is therefore potentially a critical cellular control. We report here that primary rat embryo fibroblasts (REF52) and human foreskin fibroblasts become senescent in tetraploid G1 after drug- or small interfering RNA (siRNA)-induced failure of cell cleavage. In contrast, T-antigen-transformed REF52 and p53+/+ HCT116 tumor cells rapidly become aneuploid by continuing to cycle after cleavage failure. Tetraploid primary cells quickly become quiescent, as determined by loss of the Ki-67 proliferation marker and of the fluorescent ubiquitination-based cell cycle indicator/late cell cycle marker geminin. Arrest is not due to DNA damage, as the γ-H2AX DNA damage marker remains at control levels after tetraploidy induction. Arrested tetraploid cells finally become senescent, as determined by SA-β-galactosidase activity. Tetraploid arrest is dependent on p16INK4a expression, as siRNA suppression of p16INK4a bypasses tetraploid arrest, permitting primary cells to become aneuploid. We conclude that tetraploid primary cells can become senescent without DNA damage and that induction of senescence is critical to tetraploidy arrest.
    MeSH term(s) Animals ; Cell Cycle/physiology ; Cells, Cultured ; Cellular Senescence/physiology ; Cyclin-Dependent Kinase Inhibitor p16/metabolism ; Fibroblasts/metabolism ; Humans ; Mitosis ; RNA, Small Interfering/genetics ; Rats ; Tetraploidy ; Tumor Suppressor Protein p53/metabolism
    Chemical Substances Cyclin-Dependent Kinase Inhibitor p16 ; RNA, Small Interfering ; Tumor Suppressor Protein p53
    Language English
    Publishing date 2014-08-20
    Publishing country United States
    Document type 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.E14-03-0844
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Autophagy is required for G₁/G₀ quiescence in response to nitrogen starvation in Saccharomyces cerevisiae.

    An, Zhenyi / Tassa, Amina / Thomas, Collin / Zhong, Rui / Xiao, Guanghua / Fotedar, Rati / Tu, Benjamin P / Klionsky, Daniel J / Levine, Beth

    Autophagy

    2014  Volume 10, Issue 10, Page(s) 1702–1711

    Abstract: In response to starvation, cells undergo increased levels of autophagy and cell cycle arrest but the role of autophagy in starvation-induced cell cycle arrest is not fully understood. Here we show that autophagy genes regulate cell cycle arrest in the ... ...

    Abstract In response to starvation, cells undergo increased levels of autophagy and cell cycle arrest but the role of autophagy in starvation-induced cell cycle arrest is not fully understood. Here we show that autophagy genes regulate cell cycle arrest in the budding yeast Saccharomyces cerevisiae during nitrogen starvation. While exponentially growing wild-type yeasts preferentially arrest in G₁/G₀ in response to starvation, yeasts carrying null mutations in autophagy genes show a significantly higher percentage of cells in G₂/M. In these autophagy-deficient yeast strains, starvation elicits physiological properties associated with quiescence, such as Snf1 activation, glycogen and trehalose accumulation as well as heat-shock resistance. However, while nutrient-starved wild-type yeasts finish the G₂/M transition and arrest in G₁/G 0₀ autophagy-deficient yeasts arrest in telophase. Our results suggest that autophagy is crucial for mitotic exit during starvation and appropriate entry into a G₁/G₀ quiescent state.
    MeSH term(s) Autophagy/drug effects ; G1 Phase/drug effects ; Nitrogen/deficiency ; Nitrogen/pharmacology ; Phenotype ; Resting Phase, Cell Cycle/drug effects ; Saccharomyces cerevisiae/cytology ; Saccharomyces cerevisiae/drug effects ; Saccharomyces cerevisiae/growth & development
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2014-08-12
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2454135-7
    ISSN 1554-8635 ; 1554-8627
    ISSN (online) 1554-8635
    ISSN 1554-8627
    DOI 10.4161/auto.32122
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Role of p21WAF1 in the cellular response to UV.

    Fotedar, Rati / Bendjennat, Mourad / Fotedar, Arun

    Cell cycle (Georgetown, Tex.)

    2004  Volume 3, Issue 2, Page(s) 134–137

    Abstract: UV or g irradiation mediated DNA damage activates p53 and induces cell cycle arrest. Induction of cyclin dependent kinase inhibitor p21WAF1 by p53 after DNA damage plays an important role in cell cycle arrest after gamma irradiation. The p53 mediated ... ...

    Abstract UV or g irradiation mediated DNA damage activates p53 and induces cell cycle arrest. Induction of cyclin dependent kinase inhibitor p21WAF1 by p53 after DNA damage plays an important role in cell cycle arrest after gamma irradiation. The p53 mediated cell cycle arrest has been postulated to allow cells to repair the DNA damage. Repair of UV damaged DNA occurs primarily by the nucleotide excision pathway (NER). It is known that p21WAF1 binds PCNA and inhibits PCNA function in DNA replication. PCNA is also required for repair by NER but there have been conflicting reports on whether p21WAF1 can inhibit PCNA function in NER. It has therefore been difficult to integrate the UV induced cell cycle arrest by p21 in the context of repair of UV damaged DNA. A recent study reported that p21WAF1 protein is degraded after low but not high doses of UV irradiation, that cell cycle arrest after UV is p21 independent, and that at low dose UV irradiation p21WAF1 degradation is essential for optimal DNA repair. These findings shed new light on the role of p21 in the cellular response to UV and clarify some outstanding issues concerning p21WAF1 function.
    MeSH term(s) Animals ; Cell Cycle/physiology ; Cell Cycle/radiation effects ; Checkpoint Kinase 1 ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclins/metabolism ; DNA Damage/physiology ; DNA Damage/radiation effects ; DNA Repair/physiology ; Humans ; Proliferating Cell Nuclear Antigen/metabolism ; Protein Kinases/metabolism ; Tumor Suppressor Protein p53/metabolism ; Tumor Suppressor Protein p53/radiation effects ; Ubiquitin/metabolism ; Ultraviolet Rays ; cdc25 Phosphatases/metabolism
    Chemical Substances CDKN1A protein, human ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclins ; Proliferating Cell Nuclear Antigen ; Tumor Suppressor Protein p53 ; Ubiquitin ; Protein Kinases (EC 2.7.-) ; Checkpoint Kinase 1 (EC 2.7.11.1) ; CDC25A protein, human (EC 3.1.3.48) ; cdc25 Phosphatases (EC 3.1.3.48)
    Language English
    Publishing date 2004-01-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S. ; Review
    ZDB-ID 2146183-1
    ISSN 1551-4005 ; 1538-4101 ; 1554-8627
    ISSN (online) 1551-4005
    ISSN 1538-4101 ; 1554-8627
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top