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  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 83 (2002), S. 0 
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Astrocyte and glial–neuron interactions have a critical role in brain development, which is partially mediated by glycoproteins, including adhesion molecules and growth factors. Ethanol affects the synthesis, intracellular transport, subcellular distribution and secretion of these glycoproteins, suggesting alterations in glycosylation. We analyzed the effect of long-term exposure to low doses of ethanol (30 mm) on glycosylation process in growing cultured astrocytes in vitro. Cells were incubated for short (5 min) and long (90 min) periods with several radioactively labeled carbohydrate precursors. The uptake, kinetics and metabolism of these precursors, as well as the radioactivity distribution in protein gels were analyzed. The levels of GLUT1 and mannosidase II were also determined. Ethanol increased the uptake of monosaccharides and the protein levels of GLUT1 but decreased those of mannosidase II. It altered the carbohydrate moiety of proteins and increased cell surface glycoproteins containing terminal non-reduced mannose. These results indicate that ethanol impairs glycosylation in rat astrocytes, thus disrupting brain development.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Journal of Pharmaceutical and Biomedical Analysis 10 (1992), S. 1069-1071 
    ISSN: 0731-7085
    Schlagwort(e): Ethanol determination ; biological samples. ; head-space gas chromatography
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Neurochemical research 15 (1990), S. 751-754 
    ISSN: 1573-6903
    Schlagwort(e): Glial cells ; Neurons ; Mn2+ accumulation ; K+-effect ; trace elements
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects of physiological concentrations of K+ on Mn2+ accumulation were compared in rat glial cells and neurons in culture. Increasing the K+ concentration in growth medium increased significantly the Mn2+ level of the cultivated cells, with glial cells more affected than neurons. Ethanol markedly increased the Mn2+ accumulation within glia but not within neurons while ouabaïn caused inhibition of Mn2+ uptake with neurons and glial cells. A modulation of the total protein synthesis by Mn2+ and ethanol level in the growth medium was observed with glial cells. These data suggest that the mechanisms involved in Mn2+ accumulation in glial cells are different from those present in neurons. Moreover, the results are consistent with the hypothesis that Mn2+ plays a regulatory role in glial cell metabolism.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Neurochemical research 16 (1991), S. 591-596 
    ISSN: 1573-6903
    Schlagwort(e): Ethanol ; manganese ; cell cultures ; neurons ; glial cells ; enzymes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Manganese is essential for normal development and activity of the nervous tissue. Mn2+ ions are involved in protein synthesis and may prevent free radical damage. Since it is now established that alcohol degradation may produce free radicals, we studied the effect of Mn2+ on ethanol induced alterations using cultured nerve cells as an experimental model of the central nervous system. Neurons and glial cells were cultured from rat brain cortex; a tumoral rat glial cell line (C6) was also examined. We measured enzymatic markers of nerve cell maturation (enolase, glutamine synthetase) and superoxide dismutase, a scavenger of free radicals; all these enzymes being activated by Mn2+ ions. Only for the glial cell types an alcohol antagonizing effect was found when Mn2+ was combined with ethanol. Neurons were not sensitive to that Mn2+ effect.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Das thermische Verhalten von 6-Amino-5-formyluracil (HFU), 6-Amino-1-methyl-5-formyluracil (1-HFU), 6-Amino-3-methyl-5-formyluracil (3-HFU) und 6-Amino-1,3-dimethyl-5-formyluracil (HDFU) wird beschrieben. Nur HDFU enthält Kristallwasser. Dehydratisierungs- und Schmelzenthalpiewerte wurden aus den DSC-Kurven berechnet. Auch über das thermische Verhalten neuer, durch Reaktion der obigen Pyrimidin-Derivate mit Ni(II)-, Cu(II)- und Pd(II)-Ionen erhaltenen Komplexe wird berichtet.
    Kurzfassung: Резюме Описано термическое поведение 6-амино-5-форм ил-, 6-амино-1-метил-5-формил-, 6а мино-З-метил-5-формили 6-амино-1,3-диметил-5-форми лурацилов. Показано, ч то только последнее соединени е содержит кристалли зационную воду. На основе кривых ДСК вычислены значения энтальпии д егидратации и плавле ния. Подобным образом изу чено также термическ ое разложение комплекс ов вышеприведенных п роизводных пиримидина с двухвал ентными никелем, медью и палла дием.
    Notizen: Abstract The thermal behaviour of 6-amino-5-formyluracil (HFU), 6-amino-1-methyl-5-formyluracil (1-MFU), 6-amino-3-methyl-5-formyluracil (3-HFU) and 6-amino-1,3-dimethyl-5-formyluracil (HDFU) is described. Only HDFU is shown to contain crystallization water. Dehydration and fusion enthalpy values have been calculated from the DSC curves. Likewise, the thermal behaviour of new complexes obtained by reaction between the above pyrimidine derivatives and Ni(II), Cu(II) and Pd(II) ions is reported.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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