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  • 1985-1989  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Age on Brain Cortical Protein Kinase C and Its Mediation of 5-Hydroxytryptamine Release (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 52 (1989), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effects of age on the activity and translocation of protein kinase C (PKC) and on the facilitation of 5-hydroxytryptamine (5-HT, serotonin) release induced by PKC activation with the phorbol ester phorbol 12-myristate 13-acetate were investigated. The activities of cortical PKC and its translocation in response to K+ depolarization and phorbol ester stimulation were reduced during aging in Fischer-344 rats. Parietal cortical brain slices from 6-, 12-, and 24-month-old animals were preloaded with [3H]5-HT and release was evoked by 65 mM K+ or the calcium ionophore A23187. 5-HT release induced by either K+ or A23187 was found to be reduced in 12- and 24-month-old as compared to 6-month-old animals. This decrease was not reversed by high extracellular Ca2+. Activation of PKC resulted in a facilitated transmitter release in tissue from 6- and 12-month-old animals but reduced [3H]5-HT release in slices from 24-month-old animals. These responses were prevented by the putative PKC inhibitor 1-(5-isoquinolinesulfonyl)-2-methylpiperazine (H-7), but not by increasing extracellular or intracellular Ca2+. The results demonstrate an age-related change (1) in brain PKC activity and translocation and (2) in a physiological response to PKC stimulation. These results may have implications for other PKC-mediated functions that are altered during senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1989.tb10915.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Chronic Lithium Treatment on 5-Hydroxytryptamine Autoreceptors and Release of 5-[3H]Hydroxytryptamine from Rat Brain Cortical, Hippocampal, and Hypothalamic Slices (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 50 (1988), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effect of acute and chronic lithium treatments on 5-hydroxytryptamine (5-HT, serotonin) release and on its regulation by presynaptic 5-HT autoreceptors was studied in [3H]5-HT preloaded superfused rat brain slices. The [3H]5-HT overflow evoked by a 30-s exposure to 65 mM K+ was increased after 3 weeks of ingestion of lithium-containing diet in the three brain areas examined. Acute injection of 4 mEq/kg lithium chloride did not affect 5-HT release. The K+-induced release observed in both control and chronically lithium-treated animals was Ca2+-dependent. Chronic lithium treatment was also found to be associated with a decrease in basal [3H]5-HT overflow in the cortex and hypothalamus and with an increase in spontaneous hippocampal 5-HT overflow. The Ca2+-independent overflow induced by fenfluramine was also decreased in cortical slices from lithium-treated animals. The sensitivity of the inhibitory 5-HT autoreceptors was assessed by the response to the 5-HT agonist 5-methoxytryptamine. The results indicate a marked reduction in the maximal inhibition of [3H]5-HT release induced by 5-methoxytryptamine in slices obtained from animals which have been treated with lithium for 3 weeks. These data suggest that the functional down regulation of the prejunctional 5-HT sites may be responsible for the increase in K+-stimulated 5-HT overflow in brain slices of animals treated chronically with lithium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1988.tb13249.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Increased 5-Hydroxytryptamine and Norepinephrine Release from Rat Brain Slices by the Red Sea Flatfish (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 47 (1986), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effect of the Red Sea flatfish toxin pardaxin was examined on K+-evoked and on basal release of either [3H]norepinephrine or [3H]5-hydroxytryptamine from preloaded rat cortical slices. The K+-induced release of the neurotransmitters was stimulated in a dose-related manner at concentrations ranging from 0.5 to 4 μg/ml. Basal release of the two transmitters was elevated to a lesser extent. Although the stimulation of evoked release was approximately equivalent for the two neurotransmitters, the response to 5-hydroxytryptamine was reversible whereas that of norepinephrine was not washed by 20 min of superfusion. The mechanisms involved in producing these actions of pardaxin are not known; however, they may be mediated by changes in electrolyte fluxes across the neuronal membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1986.tb04550.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Chronic lithium: desensitization of autoreceptors mediating serotonin release (1988)
    Springer
    Psychopharmacology 94 (1988), S. 312-314 
    Details
    ISSN: 1432-2072
    Keywords: Lithium ; Serotonin ; Autoreceptors ; Desensitization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of chronic lithium treatment on K+-induced release of preloaded [3H] serotonin ([3H]5-HT) from brain slices and its regulation by the presynaptic serotonin autoreceptors were investigated in superfused cortical, hippocampal and hypothalamic brain slices. Three weeks of treatment with a lithium-containing diet increased stimulation-induced [3H]5-HT overflow in the three brain regions examined. The sensitivity of the inhibitory serotonin autoreceptors was tested by determining K+-elicited release inhibition or potentiation in response to exposure to the agonist, LSD or to the antagonist, methiothepin, respectively. A reduced maximal inhibitory response to LSD was obtained in lithium-treated animals. The potentiation by methiothepin was also markedly diminished in the treated animals. These results suggest that chronic lithium treatment induces a desensitization of serotonin autoreceptors which may result in increased serotonin release from the serotonin nerve terminals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174681
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    Paper (German National Licenses)
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