Involvement of Autophagy in Levodopa‐Induced Dyskinesia
Mov Disord. 2021-01-18; :
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Feyder M(#)(1), Plewnia C(#)(1), Lieberman OJ(2), Spigolon G(1), Piccin A(1), Urbina L(1), Dehay B(3), Li Q(4)(5), Nilsson P(6), Altun M(7), Santini E(1)(2), Sulzer D(2), Bezard E(3)(4), Borgkvist A(1)(2), Fisone G(1).
(1)Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.
(2)Departments of Neurology, Pharmacology and Psychiatry, Columbia University, and New York State Psychiatric Institute, New York, New York, USA.
(3)Univ. Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F-33000, France.
(4)Motac Neuroscience Ltd, Manchester, United Kingdom.
(5)Institute of Laboratory Animal Sciences & China Academy of Medical Sciences, Beijing, China.
(6)Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Stockholm, Sweden.
(7)Science for Life Laboratory, Department of Laboratory Medicine, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
BACKGROUND: Autophagy is intensively studied in cancer, metabolic and neurodegenerative diseases, but little is known about its role in pathological conditions linked to altered neurotransmission. We examined the involvement of autophagy in levodopa (l-dopa)-induced dyskinesia, a frequent motor complication developed in response to standard dopamine replacement therapy in parkinsonian
METHODS: We used mouse and non-human primate models of Parkinson’s disease to examine changes in autophagy associated with chronic l-dopa administration and to establish a causative link between impaired autophagy and dyskinesia. RESULTS: We found that l-dopa-induced dyskinesia is associated with accumulation of the autophagy-specific substrate p62, a marker of autophagy deficiency. Increased p62 was observed in a subset of projection neurons located in the striatum and depended on l-dopa-mediated activation of dopamine D1 receptors, and mammalian target of rapamycin. Inhibition of mammalian target of rapamycin complex 1 with rapamycin counteracted the impairment of autophagy produced by l-dopa, and reduced dyskinesia. The anti-dyskinetic effect of rapamycin was lost when autophagy was constitutively suppressed in D1 receptor-expressing striatal neurons, through inactivation of the autophagy-related gene protein 7.
CONCLUSIONS: These findings indicate that augmented responsiveness at D1 receptors leads to dysregulated autophagy, and results in the emergence of l-dopa-induced dyskinesia. They further suggest the enhancement of autophagy as a therapeutic strategy against dyskinesia.
© 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
© 2021 The Authors. Movement Disorders published by Wiley Periodicals LLC on
behalf of International Parkinson and Movement Disorder Society.