Respiratory pattern generation and motor output integration are strongly influenced by behavioral state. In particular, rapid eye movement (REM) sleep is associated with increased variability of respiratory timing and effort. In extreme cases, the respiratory dysrhythmia permitted or provoked during REM sleep appears to be a pathogenic factor for sleep-related breathing disorders such as sleep apnea syndrome. The neuronal networks and synaptic mechanisms that render respiratory outputs more labile during REM sleep remain poorly defined, but during the first funding cycle of this research program we developed key evidence supporting a discrete respiratory modulating region (RMR) within the pedunculopontine tegmental (PPT) nucleus of the pons. The PPT also is an important region for REM sleep homeostasis. We showed that PPT stimulation produced respiratory dysrhythmia in sleeping and anesthetized animals and this application presents preliminary evidence that PPT lesions reduce apnea expression during REM sleep. During years 6 to 10 we will pursue 3 specific aims to determine the anatomical localization, synaptic regulation, and physiological relevance of neurons in the RMR for state-dependent control of respiratory pattern variability.
Aim 1 will employ nanoliter injections of glutamate and polygraphic monitoring to test the hypothesis that the RMR is anatomically distinct from regions within the PPT responsible for regulation of REM sleep and associated phenomena, including: EEG activation, hippocampal theta rhythm, and ponto-geniculo-occipital wave generation.
Aim 2 will test the hypothesis that making excitotoxic lesions to the functionally identified RMR will decrease respiratory variability during sleep, and in particular during REM sleep. Defining the characteristic extent of the RMR in Aim 1 will help us to tune the size of these lesions, and we will correlate the extent of cell loss with the respiratory impact.
Aim 3 will use injections of agonists and antagonists of, and immunohistochemistry for specific glutamate receptor subtypes to define the synaptic regulation of RMR neurons by glutamate. Extending the progress of the first funding cycle, these aims will provide important insights regarding the state-dependent mechanisms by which the PPT modulates respiratory pattern. ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
2R01AG016303-06A2
Application #
7036274
Study Section
Respiratory Integrative Biology and Translational Research Study Section (RIBT)
Program Officer
Monjan, Andrew A
Project Start
1999-07-01
Project End
2011-01-31
Budget Start
2006-02-15
Budget End
2007-01-31
Support Year
6
Fiscal Year
2006
Total Cost
$317,750
Indirect Cost
Name
University of Illinois at Chicago
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
Fink, Anne M; Topchiy, Irina; Ragozzino, Michael et al. (2014) Brown Norway and Zucker Lean rats demonstrate circadian variation in ventilation and sleep apnea. Sleep 37:715-21
Topchiy, Irina; Amodeo, Dionisio A; Ragozzino, Michael E et al. (2014) Acute exacerbation of sleep apnea by hyperoxia impairs cognitive flexibility in Brown-Norway rats. Sleep 37:1851-61
Kalauzi, Aleksandar; Spasic, Sladjana; Petrovic, Jelena et al. (2012) Cortico-pontine theta carrier frequency phase shift across sleep/wake states following monoaminergic lesion in rat. Gen Physiol Biophys 31:163-71
Spasic, Sladjana; Kalauzi, Aleksandar; Kesic, Srdjan et al. (2011) Surrogate data modeling the relationship between high frequency amplitudes and Higuchi fractal dimension of EEG signals in anesthetized rats. J Theor Biol 289:160-6
Topchiy, Irina; Radulovacki, Miodrag; Waxman, Jonathan et al. (2011) Impact of the vagal feedback on cardiorespiratory coupling in anesthetized rats. Respir Physiol Neurobiol 175:375-82
Å aponji?, Jasna (2011) [Selective stimulations and lesions of the rat brain nuclei as the models for research of the human sleep pathology mechanisms]. Glas Srp Akad Nauka Med :85-97
Topchiy, Irina; Waxman, Jonathan; Radulovacki, Miodrag et al. (2010) Functional topography of respiratory, cardiovascular and pontine-wave responses to glutamate microstimulation of the pedunculopontine tegmentum of the rat. Respir Physiol Neurobiol 173:64-70
(2009) [Neurobiology of sleep apnea: implication for therapy?]. Glas Srp Akad Nauka Med :37-45
Topchiy, Irina; Radulovacki, Miodrag; Waxman, Jonathan et al. (2009) Cardiorespiratory effects of intertrigeminal area stimulation in vagotomized rats. Brain Res 1250:120-9
Kalauzi, A; Kesic, S; Saponjic, J (2009) Cortico-pontine theta synchronization phase shift following monoaminergic lesion in rat. J Physiol Pharmacol 60:79-84

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