Abstract
Fragestellung: Drogen greifen als psychotrope Substanzen in aktivierende oder hemmende Systeme des zentralen Nervensystems ein und können somit Einfluss auf die Schlafregulation nehmen. Gegenstand dieser Arbeit ist die Darstellung des Einflusses verschiedener Substanzen auf den Schlaf. Einleitend soll ein Überblick über wichtige Schlafcharakteristika und Schlafregulationsmechanismen gegeben werden. Ergebnisse: Schlaf wird anhand charakteristischer elektroenzephalographischer Merkmale in einzelne Stadien eingeteilt, die in bestimmter Weise während der Nacht durchlaufen werden. Bei der Schlafregulation werden Mechanismen der Wachheit, der Schlafinduktion und des Wechsels zwischen REM- und non-REM-Schlaf unterschieden. Für die Regulation ist ein Netzwerk spezialisierter Kerngebiete des Gehirns verantwortlich, in dem das Aufsteigende retikuläre aktivierende System, Raphe-Kerne, Locus coeruleus, ventrolaterale präoptische Nucleus, der tuberomammilläre Nucleus und die laterodorsalen und pedunculopontinen tegmentalen Nuclei beteiligt sind. Die Interaktion dieser Kerngebiete wird durch Neurotransmitter wie Acetylcholin, Noradrenalin, Serotonin, Dopamin, GABA, Histamin, Orexin und Adenosin vermittelt. Die Regulation unterliegt einerseits der wechselseitigen Inhibition der Zentren wie auch circadianen Taktgebern. Schlussfolgerung: Externe Einflussnahme auf die Interaktion dieser Neurotransmitter führt zu Veränderungen der Schlafarchitektur und könnte den Ansatzpunkt verschiedener schlafstörender oder -fördernder Substanzen darstellen.
Aim: Drugs as psychotropic substances may induce either activating or tranquilizing effects on the brain and therefore affect sleep regulating systems. In this work we will focus on the influence of several drugs on sleep changes. First we will give an overview about sleep characteristics and sleep regulating mechanisms. Results: In the electroencephalogram specific sleep stages are defined which occur in a distinctive order during the night. Sleep regulation means mechanisms to induce wakefulness and sleep as well as the alternative occurrence of REM and nonREM sleep. In this regulation a specialized neuronal brain network is involved, including the ascending reticular activating system (ARAS), the Raphe nuclei, Locus coeruleus, ventrolateral praeoptic nucleus, tuberomammilare nucleus, the laterodorsal and pedunculopontine tegmental nuclei. Several neurotransmitters like acetylcholine, norepinephrine, serotonine, dopamine, GABA, histamine, orexine and adenosine are mediating the interaction between these brain centers. Reciprocal inhibition and circadian rhythms are two regulating principles within this network. Conclusion: Any external influence upon this interaction of neurotransmitters could induce sleep changes and may be the mechanism by which several substances induce or disturb sleep.
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