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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 27 (1988), S. 229-235 
    ISSN: 1436-6215
    Keywords: growth hormone ; casein ; soy protein ; endocrine response ; hypercholesterolemia ; Wachstumshormon ; Casein ; Sojaprotein ; endokrine Reaktion ; Hypercholesterinämie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Casein, im Gegensatz zu pflanzlichen Proteinen, führt bei einigen Tierspezies zu Hypercholesterinämie. Dies könnte mit einer Änderung des Hormonstatus einhergehen. Neben anderen Hormonen hat das Wachstumshormon (GH) eine wichtige Rolle in der Regulation des Cholesterinstoffwechsels. Ein GH-Mangel führt zu Hypercholesterinämie. Diese Untersuchung zeigt, daß die zyklischen Schwankungen der GH-Spiegel durch die Art des Nahrungsproteins beeinflußt werden. Die GH-Mittelwerte und die errechnete Fläche unter den GH-Spiegeln über 4 Stunden sind bei Caseingefütterten Tieren höher als bei Sojaprotein-gefütterten Tieren. Höhere GH-Spiegel in Casein-gefütterten im Vergleich zu Gluten-gefütterten Tieren wurden bereits beobachtet. Unsere Daten unterstützen also die These, daß verschiedene Nahrungsproteine zu unterschiedlichen endokrinen Antworten führen. Da aber niedrige GH-Spiegel die Voraussetzung für die Ausbildung einer Hypercholesterinämie sind, können die beobachteten Unterschiede nicht die Basis für die Ausprägung einer Casein-induzierten Hypercholesterinämie sein.
    Notes: Summary Dietary casein, compared to vegetable protein, causes hypercholesterolemia in some animal species. This may be associated with a change of hormonal status. Among others, GH has an important impact on cholesterol metabolism; GH deficiency results in hypercholesterolemia. This paper shows that the rhythmic variation of GH levels in rats is differently affected by different dietary proteins. Within a 4-h observation period overall mean values and integrated areas under the GH levels plotted against time are higher with casein as compared to soy protein. Secretory GH peak values are lower than reported before for chow-fed rats. These observations support the idea that different dietary proteins cause a different endocrine response. As GH levels are higher with casein, while lower levels would be expected to be associated with hypercholesterolemia, the observed differences are obviously of less relevance for the expression of casein-induced hypercholesterolemia.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1106
    Keywords: Preoptic unit activity ; Stimulation of mesencephalon ; Amygdala ; Mediobasal hypothalamus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single cell activity from preoptic neurons was extracellularly recorded in normal female rats and the effects of electrical stimulation of the mediocortical amygdala (AMY), the N. med. raphes (MES) and the mediobasal hypothalamus (MBH) was tested. 1. One type of preoptic neurons (55%) reacted with primary excitation to a single electrical stimulus of AMY, MES or MBH, which was usually followed by a period of postexcitatory inhibition. Another type of neurons (29%) were first inhibited after stimulation of AMY, MES or MBH and then showed a period of postinhibitory excitation. The discharge rate of a third type was not affected by electrical stimulation of these structures (16%). If a neuron was affected by a stimulus in a given area it predictably reacted in the same fashion to stimulation of the other areas. 2. The postexcitatory inhibition of the majority of the primarily excited neurons was strong enough to prevent the stimulus response to a second stimulus. Occasional recordings from two neighboured cells simultaneously indicate that they can be inhibitory to each other. 3. By pulse train stimulation of the AMY or MES with varying frequencies it could be demonstrated that low frequencies (10 Hz) had a facilitatory action whereas higher frequencies (100 Hz) were inhibitory to preoptic discharge rates. 4. No obvious alteration of neuronal properties we found neither in rats treated intraventricularly with 5,6-dihydroxytryptamine, which strongly reduces central nervous system serotonin content, nor in 6-hydroxydopamine treated rats, which had low central nervous system catecholamine levels.
    Type of Medium: Electronic Resource
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