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  • Title: Microdialysis of cat pons reveals enhanced acetylcholine release during state-dependent respiratory depression.
    Author: Lydic R, Baghdoyan HA, Lorinc Z.
    Journal: Am J Physiol; 1991 Sep; 261(3 Pt 2):R766-70. PubMed ID: 1887963.
    Abstract:
    Microinjection of cholinergic agonists and acetylcholinesterase inhibitors into the medial pontine reticular formation (mPRF) causes a state that is polygraphically similar to rapid-eye-movement (REM) sleep. Respiratory studies of intact unanesthetized cats during this cholinergically induced REM sleep-like state have shown that the same cholinoceptive pontine reticular regions that mediate REM sleep can also cause state-dependent respiratory depression. The present study investigated the hypothesis that acetylcholine (ACh) release in the mPRF is increased during the respiratory depression that accompanies the cholinergically induced REM sleep-like state. Cats were implanted for polygraphic recording of sleep and wakefulness and with guide tubes aimed for placing a microinjector in one mPRF and a microdialysis probe in the contralateral mPRF. ACh release was measured with high-performance liquid chromatography and electrochemical detection. Compared with waking levels, ACh was significantly increased and respiratory frequency was significantly decreased during the carbachol-induced REM sleep-like state. These results support the hypothesis that endogenous cholinergic neurotransmission in brain regions known to regulate REM sleep can also cause state-dependent changes in respiratory control.
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