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  • 1
    Electronic Resource
    Electronic Resource
    Increased nuclear factor-erythroid 2 p45-related factor 2 activity protects SH-SY5Y cells against oxidative damage (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 95 (2005), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The ability of cells to control the balance between the generation and quenching of reactive oxygen species is important in combating potentially damaging effects of oxidative stress. One mechanism that cells use to maintain redox homeostasis is the antioxidant response pathway. Antioxidant response elements (AREs) are cis-acting elements located in regulatory regions of antioxidant and phase II detoxification genes. Nuclear factor-erythroid 2 p45-related factor 2 (Nrf2) is a member of the Cap ‘n’ Collar family of transcription factors that binds to the ARE and regulates the transcription of specific ARE-containing genes such as NAD(P)H:quinone oxidoreductase 1, glutamylcysteine synthetase and heme oxygenase. Activation of Nrf2 results in release from its negative repressor, Kelch-like ECH-associated protein 1 (Keap1), and allows Nrf2 to translocate into the nucleus to induce gene expression. In this study, we demonstrate that increasing Nrf2 activity by various methods, including chemical induction, Nrf2 overexpression or Keap1 siRNA knockdown, protects cells against specific types of oxidative damage. Cells were protected against 6-hydroxydopamine- and 3-morpholinosydnonimine-mediated toxicity but not against 1-methyl-1-4-phenylpyridinium toxicity. As oxidative stress is a hallmark of several neurodegenerative disorders, including Parkinson's disease, pharmacological agents that selectively target the Keap1-Nrf2 pathway may provide a novel neuroprotective strategy for the treatment of these diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.2005.03377.x
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  • 2
    Electronic Resource
    Electronic Resource
    Further experiments on spermidine-mediated floral-bud formation in thin-layer explants of Wisconsin 38 tobacco (1990)
    Springer
    Planta 181 (1990), S. 212-215 
    Details
    ISSN: 1432-2048
    Keywords: Flower bud ; Polyamine ; Spermidine ; Tissue culture (floral regeneration) ; Nicotiana (floral regeneration)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the effects of various polyamines on bud regeneration in thin-layer tissue explants of vegetative and floweringNicotiana tabacum L. cv. Wisconsin 38, in which application of exogenous spermidine (Spd) to vegetative cultures causes the initiation and development of some flower buds (Kaur-Sawhney et al. 1988 Planta173, 282). We now show that this effect is dependent on the time and duration of application, Spd being required from the start of the cultures for about three weeks. Neither putrescine nor spermine is effective in the concentration range tested. Spermidine cannot replace kinetin (N6-furfurylaminopurine) in cultures at the time of floral bud formation, but once the buds are initiated in the presence of kinetin, addition of Spd to the medium greatly increases the number of floral buds that develop into normal flowers. Addition of Spd to similar cultures derived from young, non-flowering plants did not cause the appearance of floral buds but rather induced a profusion of vegetative buds. These results indicate a morphogenetic role of Spd in bud differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02411540
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  • 3
    Electronic Resource
    Electronic Resource
    Transcribed sequences encoded in the region involved in contiguous deletion syndrome that comprises X-linked stapes fixation and deafness (1996)
    Springer
    Somatic cell and molecular genetics 22 (1996), S. 511-517 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have used a direct cDNA selection protocol to isolate expressed sequences from yeast artificial chromosome clones that contain approximately 900 Kb of genomic DNA from Xq21 band that is deleted in contiguous gene syndromes comprising of mixed deafness associated with stapes fixation (DFN3). In addition to identifying Brn4 (POU3f4), a POU domain containing transcription factor that is involved in DFN3 phenotype, we have isolated seven short fragment cDNAs mapping to the deleted region. Some of the selected fragments showed X-chromosome specificity and hybridized to autosomal DNA fragments, indicating the presence of a low abundance interspersed repeat in the cDNAs or their homology to some uncharacterized family of genes. In conformity with the inertness of Xq21 band our results demonstrate that the region encodes far less than the average density of genes in other parts of the genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02369442
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  • 4
    Electronic Resource
    Electronic Resource
    A cyclophilin gene-like sequence maps to human X-chromosome (1996)
    Springer
    Somatic cell and molecular genetics 22 (1996), S. 67-73 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We isolated cDNA fragments encoded in an X-chromosome specific YAC from the locus DXS995 by using direct cDNA selection method. Several of the selected cDNA fragments were identical to various exons of cyclophilin A gene. Hybridization of the selected cyclophilin cDNA fragments to the target YAC, presence of these sequences in an X-chromosome specific phage library and absence of a cross hybridizing fragment in a cell line (XL-45) that contains deletions of the interval Xq21, demonstrates that a cyclophilin like sequence is present in the human X-chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374377
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  • 5
    Electronic Resource
    Electronic Resource
    Toward Expression Mapping of Albinism-Deafness Syndrome (ADFN) Locus on Chromosome Xq26 (1998)
    Springer
    Somatic cell and molecular genetics 24 (1998), S. 135-140 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have employed a direct cDNA selection methodology to isolate transcribed sequences encoded in the human chromosomal interval Xq26 that contains the gene for X-chromosome linked albinism deafness syndrome (ADFN). ADFN had been previously mapped to an 8 centi Morgan region on chromosome Xq26. We have constructed six cDNA libraries specific to six YACs mapping to a 1.5 mb span at the distal boundary of the ADFN locus. The YAC specific libraries were characterized for the presence of unique cDNAs. We have identified 15 transcribed sequences from the selected cDNA libraries. These cDNAs matched to three well characterized sequences corresponding to steroid 5-alpha reductase, ribosomal protein L28, and a short transcript that has been shown to be expressed in human brain cortex. Seven of the cDNAs matched to expressed sequence tags or other sequences of unknown function, and five cDNAs shared no homology with sequences in the public data bases. Each one of these sequences was represented as 3–10 clones in the set that was subjected to sequencing. Further characterization of these transcribed sequences may indicate potential candidates responsible for ADFN. We have discussed the utility of cDNA selection methodology in assembling transcript maps and identifying potential candidates for genetic deafness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:SCAM.0000007116.34356.ea
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