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Interplay between adenosine signaling and the circadian system
Škrle, Jan ; Bendová, Zdeňka (advisor) ; Houdek, Pavel (referee)
Sleep is regulated primarily by the two processes, by Process C and S. Process C represents circadian regulation by circadian system; Process S represents the homeostatic sleep drive. Circadian system controls the timing of many physiological functions including body temperature rhythms, locomotor activity rhythms, periodically changing hormones levels etc. Process C contributes to sleep regulation mainly by setting lower and upper thresholds for a sleep pressure. When the sleep pressure reaches one of these thresholds, falling asleep or waking is promoted. However, the sleep architecture is altered by a phase of endogenous oscillators as well. The homeostatic sleep drive is based on a sleep- wake history with the sleep pressure rising during a wakefulness and lowering during sleep. This mechanism is responsible for a modification in structure of a recovery sleep following a sleep deprivation. Due to the effects of adenosine on sleep regulation, adenosine signalling is considered to play a critical role in the homeostatic sleep drive. These two processes were thought to be independent of each other, but new data show that there is a reciprocal regulation between them. The aim of this work was to conclude, where these two processes meet, with a special attention on processes, where the adenosine...
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