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  • 1
    Electronic Resource
    Electronic Resource
    Octopamine plasma levels and hepatic encephalopathy: A re-appraisal of the problem
    Amsterdam : Elsevier
    Clinica Chimica Acta 67 (1976), S. 255-261 
    Details
    ISSN: 0009-8981
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-8981(76)90333-8
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of oral 5-hydroxytryptophan administration on feeding behavior in obese adult female subjects (1989)
    Springer
    Journal of neural transmission 76 (1989), S. 109-117 
    Details
    ISSN: 1435-1463
    Keywords: 5-Hydroxytryptophan ; feeding behavior ; obesity ; serotoninergic system ; tryptophan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nineteen obese female subjects with body mass index ranging between 30 and 40 were included in a double-blind crossover study aimed at evaluating the effects of oral 5-hydroxytryptophan administration on feeding behavior, mood state and weight loss. Either 5-hydroxytryptophan (8 mg/kg/day) or placebo was administered for five weeks during which patients were not prescribed any dietary restrictions. Feeding behavior was investigated by means of a questionnaire designed to establish the onset of anorexia and related symptoms. Food intake was evaluated using a three-day diet diary. BDI, SI, STAI-T, and STAI-S were used to assess mood state. The administration of 5-hydroxytryptophan resulted in no changes in mood state but promoted typical anorexiarelated symptoms, decreased food intake and weight loss during the period of observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01578751
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synergism between different transport systems stimulates the uptake of neutral amino acids by isolated brain microvessels (1992)
    Springer
    Amino acids 2 (1992), S. 13-23 
    Details
    ISSN: 1438-2199
    Keywords: Amino acid transport ; Blood-brain barrier ; Glutamine ; Methionine ; Methanethiol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The polar long-chain amino acids glutamine and methionine can be transported across the endothelial cells of brain microvessels either by an L-system which operates by a facilitated diffusion, exchanging mechanism, or by a concentrating, energy-dependent A-system. The presence of glutamine and/or of methionine can induce a synergism between the two transport systems which results, by a transstimulation mechanism, in a net increased uptake of neutral hydrophobic aminoacids. The methionine analog S-methylthiocysteine, which is the mixed disulfide resulting from the combination of methanethiol with cysteine, behaves similarly to methionine in stimulating the uptake of neutral hydrophobic amino acids. The same transstimulating effect can even be obtained in collagenase-treated, A-system-deprived microvessels by inducing the direct formation of S-methylthiocysteine within the cytoplasmic compartment of the endothelial cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806074
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Plasma and CSF tryptophan in cancer anorexia (1990)
    Springer
    Journal of neural transmission 81 (1990), S. 225-233 
    Details
    ISSN: 1435-1463
    Keywords: Amino acids transport ; anorexia ; blood brain barrier ; cancer ; CSF tryptophan ; plasma tryptophan ; serotoninergic system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Eighteen untreated cancer patients and ten sex- and age-matched healthy volunteers were studied. In all patients eating behavior was investigated by means of a specific questionnaire from which the presence of anorexia and anorexia-related symptoms was assessed. To investigate the role of tryptophan in cancer anorexia, fasting plasma and CSF levels of tryptophan and other neutral amino acids were assayed in patients and controls. Cancer patients showed abnormally high plasma free tryptophan levels. In case of patients with cancer anorexia a significant rise of the ratio in plasma between free and tryptophan/large neutral amino acids, competing with tryptophan for its brain entry, was observed. This increase was correlated to a consistent rise of CSF tryptophan levels suggesting a specific role of the serotoninergic system in the pathogenesis of cancer anorexia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245044
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Branched-chain amino acids vs lactulose in the treatment of hepatic coma (1982)
    Springer
    Digestive diseases and sciences 27 (1982), S. 929-935 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A controlled study was carried out in two groups of 20 patients with cirrhosis of the liver and deep coma in order to compare the efficacy of intravenous branched-chain amino acid solutions in 20% glucose (group A) vs lactulose plus glucose in isocaloric amount (group B). There were 3 drop-outs from each group. Plasma amino acids and ammonia were assayed at fixed intervals throughout the 10-day observation period. Routine tests were assayed daily. Complete mental recovery was obtained in 70% of patients in group A and in 47% in group B. The difference was not significant, likely due to the lack of placebo group. With the exception of free tryptophan/all competing amino acids ratio, the modifications in plasma amino acid levels showed no correlation with the clinical course under either treatment. Ammonia, like free tryptophan, decreased significantly upon mental recovery, paralleling the clinical course throughout the study. In conclusion, branched-chain amino acids are at least as effective as lactulose in deep hepatic coma. It is suggested that branched-chain amino acids may reverse coma either by competing with brain entry of the aromatic amino acid or by metabolically decreasing free tryptophan and ammonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01316578
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    Paper (German National Licenses)
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