Abstract:
:This review describes a series of animal experiments that investigate the role of endogenous adenosine (AD) in sleep. We propose that AD is a modulator of the sleepiness associated with prolonged wakefulness. More specifically, we suggest that, during prolonged wakefulness, extracellular AD accumulates selectively in the basal forebrain (BF) and cortex and promotes the transition from wakefulness to slow wave sleep (SWS) by inhibiting cholinergic and non-cholinergic wakefulness-promoting BF neurons at the AD A1 receptor. New in vitro data are also compatible with the hypothesis that, via presynaptic inhibition of GABAergic inhibitory input, AD may disinhibit neurons in the preoptic/anterior hypothalamus (POAH) that have SWS-selective activity and Fos expression. Our in vitro recordings initially showed that endogenous AD suppressed the discharge activity of neurons in the BF cholinergic zone via the AD A1 receptor. Moreover, in identified mesopontine cholinergic neurons, AD was shown to act post-synaptically by hyperpolarizng the membrane via an inwardly rectifying potassium current and inhibition of the hyperpolarization-activated current, I(h). In vivo microdialysis in the cat has shown that AD in the BF cholinergic zone accumulates during prolonged wakefulness, and declines slowly during subsequent sleep, findings confirmed in the rat. Moreover, increasing BF AD concentrations to approximately the level as during sleep deprivation by a nucleoside transport blocker mimicked the effect of sleep deprivation on both the EEG power spectrum and behavioral state distribution: wakefulness was decreased, and there were increases in SWS and REM sleep. As predicted, microdialyis application of the specific A1 receptor antagonist cyclopentyltheophylline (CPT) in the BF produced the opposite effects on behavioral state, increasing wakefulness and decreasing SWS and REM. Combined unit recording and microdialysis studies have shown neurons selectively active in wakefulness, compared with SWS, have discharge activity suppressed by both AD and the A1-specific agonist cyclohexyladenosine (CHA), while discharge activity is increased by the A1 receptor antagonist, CPT. We next addressed the question of whether AD exerts its effects locally or globally. Adenosine accumulation during prolonged wakefulness occurred in the BF and neocortex, although, unlike in the BF, cortical AD levels declined in the 6th h of sleep deprivation and declined further during subsequent recovery sleep. Somewhat to our surprise, AD concentrations did not increase during prolonged wakefulness (6 h) even in regions important in behavioral state control, such as the POAH, dorsal raphe nucleus, and pedunculopontine tegmental nucleus, nor did it increase in the ventrolateral/ventroanterior thalamic nucleii. These data suggest the presence of brain region-specific differences in AD transporters and/or degradation that become evident with prolonged wakefulness, even though AD concentrations are higher in all brain sites sampled during the naturally occurring (and shorter duration) episodes of wakefulness as compared to sleep episodes in the freely moving and behaving cat. Might AD also produce modulation of activity of neurons that have sleep selective transcriptional (Fos) and discharge activity in the preoptic/anterior hypothalamus zone? Whole cell patch clamp recordings in the in vitro horizontal slice showed fast and likely GABAergic inhibitory post-synaptic potentials and currents that were greatly decreased by bath application of AD. Adenosine may thus disinhibit and promote expression of sleep-related neuronal activity in the POAH. In summary, a growing body of evidence supports the role of AD as a mediator of the sleepiness following prolonged wakefulness, a role in which its inhibitory actions on the BF wakefulness-promoting neurons may be especially important.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Strecker RE,Morairty S,Thakkar MM,Porkka-Heiskanen T,Basheer R,Dauphin LJ,Rainnie DG,Portas CM,Greene RW,McCarley RWdoi
10.1016/s0166-4328(00)00258-8subject
Has Abstractpub_date
2000-11-01 00:00:00pages
183-204issue
2eissn
0166-4328issn
1872-7549pii
S0166-4328(00)00258-8journal_volume
115pub_type
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