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  • 1
    ISSN: 1432-2072
    Keywords: Deprenyl ; MAO-inhibiting antidepressants ; Serotonin ; Norepinephrine ; Pineal gland ; Circadian rhythms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The type A monoamine oxidase (MAO)-inhibiting antidepressant clorgyline (1 mg/kg/24 days) administered to rhesus monkeys increased night-time cerebrospinal fluid (CSF) melatonin concentrations 3-fold and day-time maltonin values 5-fold. Other circadian parameters of melatonin release, including the peak time and duration of nocturnal melatonin elevation measured during continuous CSF collection periods of 90 min duration over 24-h cycles, were unaffected by clorgyline. While pinealocytes are thought to contain only MAO-B, treatment with the selective MAO-B inhibitor deprenyl (2 mg/kg/24 days) did not alter day or night-time melatonin concentrations. These results are consistent with MAO-A and non-selective MAO inhibitors acting via blockade of degradation of the preferential substrates of MAO-A, serotonin and/or norepinephrine, in adrenergic neurons entering the pineal gland. Further study is needed to evaluate the relative contributions of an increased availability of the melatonin precursor, serotonin, or a sustained net increase in alpha1-or beta adrenoceptor-mediated input on pinealocytes to these marked changes in melatonin production.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2072
    Keywords: Alzheimer's disease ; Cognition ; Dementia ; Deprenyl ; Monoamines ; Monoamine oxidase inhibitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Monoamine neurotransmitter systems, along with cholinergic systems, are known to play important roles in cognition, and are disrupted in at least some patients with dementia of the Alzheimer type (DAT). This suggests that monoamine-enhancing drugs might ameliorate cognitive symptoms in certain patients with DAT. l-Deprenyl is a monoamine oxidase (MAO) inhibitor which may selectively inhibit MAO-B at low doses, while at high doses it nonselectively inhibits MAO-A as well as MAO-B. We studied its effects on several types of cognitive function in 17 patients with DAT. Two doses of l-deprenyl (10 mg/day and 40 mg/day) and placebo were compared in a double-blind, serial treatment design. Episodic learning and memory, knowledge memory, attention, recognition, and performance on a continuous performance task were assessed at baseline and under these drug and placebo conditions. Statistically significant improvement was noted in performance on an episodic memory and learning task requiring complex information processing and sustained conscious effort during treatment with l-deprenyl 10 mg/day. Knowledge memory, intrusions, and other cognitive functions relevant to DAT were not altered by l-deprenyl at either dose.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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