Striatal dopaminergic deficit and sleep in idiopathic rapid eye movement behaviour disorder: an explorative study
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Authors
Wasserman, Danielle
Bindman, Dorothea
Nesbitt, Alexander D
Cash, Diana
Milosevic, Milan
Francis, Paul T
Chaudhuri, K Ray
Leschziner, Guy D
Ferini-Strambi, Luigi
Ballard, Clive
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2021
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Article
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INTRODUCTION: Idiopathic rapid eye movement (REM) sleep behavior disorder (iRBD) is increasingly recognised as an important precursor disease state of alpha-synucleinopathies. This parasomnia is characterized by a history of recurrent nocturnal dream enactment behaviour, loss of skeletal muscle atonia, and increased phasic muscle activity during REM sleep. Neuroimaging studies of striatal dopamine transporter uptake tracer signaling suggest increasing dopaminergic deficit across the continuum of the alpha-synucleinopathies, with early sleep dysfunction suggestive of early caudate dysfunction. Henceforth, we set out to investigate the relationship between early sleep changes and the striatal dopaminergic availability in iRBD. METHODS: Twelve patients with iRBD, who had undergone a video polysomnography and a neuroimaging assessment of striatal dopamine transporter (DaT) uptake tracer signaling, and 22 matched controls who had similarly undergone a video polysomnography were retrospectively identified. Data were statistically analyzed to identify altered sleep parameters and correlate them with striatal dopamine transporter uptake tracer signaling. RESULTS: The iRBD patients exhibited an increased number of periodic limb movements during sleep ( DISCUSSION: To the best of our knowledge, this is the first demonstration of a close relationship between dopaminergic availability in striatum and the quality of sleep in iRBD. Taken together, our exploratory findings suggest that subtle but functionally significant striatal changes in early stages of iRBD may contribute to the further shaping of sleep architecture.
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Nature and Science of Sleep
Volume
Volume 13