Activation of inactivation process initiates rapid eye movement sleep

Mallick, Birendra Nath ; Singh, Abhishek ; Khanday, Mudasir Ahmad (2012) Activation of inactivation process initiates rapid eye movement sleep Progress in Neurobiology, 97 (3). pp. 259-276. ISSN 0301-0082

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Interactions among REM-ON and REM-OFF neurons form the basic scaffold for rapid eye movement sleep (REMS) regulation; however, precise mechanism of their activation and cessation, respectively, was unclear. Locus coeruleus (LC) noradrenalin (NA)-ergic neurons are REM-OFF type and receive GABA-ergic inputs among others. GABA acts postsynaptically on the NA-ergic REM-OFF neurons in the LC and presynaptically on the latter's projection terminals and modulates NA-release on the REM-ON neurons. Normally during wakefulness and non-REMS continuous release of NA from the REM-OFF neurons, which however, is reduced during the latter phase, inhibits the REM-ON neurons and prevents REMS. At this stage GABA from substantia nigra pars reticulate acting presynaptically on NA-ergic terminals on REM-ON neurons withdraws NA-release causing the REM-ON neurons to escape inhibition and being active, may be even momentarily. A working-model showing neurochemical-map explaining activation of inactivation process, showing contribution of GABA-ergic presynaptic inhibition in withdrawing NA-release and dis-inhibition induced activation of REM-ON neurons, which in turn activates other GABA-ergic neurons and shutting-off REM-OFF neurons for the initiation of REMS-generation has been explained. Our model satisfactorily explains yet unexplained puzzles (i) why normally REMS does not appear during waking, rather, appears following non-REMS; (ii) why cessation of LC-NA-ergic-REM-OFF neurons is essential for REMS-generation; (iii) factor(s) which does not allow cessation of REM-OFF neurons causes REMS-loss; (iv) the association of changes in levels of GABA and NA in the brain during REMS and its deprivation and associated symptoms; v) why often dreams are associated with REMS.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:GABA; Locus Coeruleus; Noradrenalin; Picrotoxin; Prazosin; Presynaptic and Postsynaptic Connections; Rapid Eye Movement Sleep; REM-OFF Neurons; REM-ON Neurons
ID Code:99371
Deposited On:21 Apr 2016 08:42
Last Modified:21 Apr 2016 08:42

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