Matthieu F Bastide1, Brice de la Crompe1, Evelyne Doudnikoff1, Pierre-Olivier Fernagut1, Christian E Gross2, Nicolas Mallet1, Thomas Boraud1, Erwan Bézard3. 1. Université de Bordeaux, Institut des Maladies Neurodégénératives, Bordeaux, France; National Centre for Scientific Research, Institut des Maladies Neurodégénératives, Bordeaux, France. 2. Université de Bordeaux, Institut des Maladies Neurodégénératives, Bordeaux, France; National Centre for Scientific Research, Institut des Maladies Neurodégénératives, Bordeaux, France; Centre Hospitalier Universitaire de Bordeaux, Bordeaux, France. 3. Université de Bordeaux, Institut des Maladies Neurodégénératives, Bordeaux, France; National Centre for Scientific Research, Institut des Maladies Neurodégénératives, Bordeaux, France. Electronic address: erwan.bezard@u-bordeaux.fr.
Abstract
BACKGROUND: A systematic search of brain nuclei putatively involved in L-3,4-dihydroxyphenylalanine (L-DOPA)-induced dyskinesia (LID) in Parkinson's disease shed light, notably, upon the lateral habenula (LHb), which displayed an overexpression of the ∆FosB, ARC, and Zif268 immediate-early genes only in rats experiencing abnormal involuntary movements (AIMs). We thus hypothesized that LHb might play a role in LID. METHODS: ∆FosB immunoreactivity, 2-deoxyglucose uptake, and firing activity of LHb were studied in experimental models of Parkinson's disease and LID. ΔFosB-expressing LHb neurons were then targeted using the Daun02-inactivation method. A total of 18 monkeys and 55 rats were used. RESULTS: LHb was found to be metabolically modified in dyskinetic monkeys and its neuronal firing frequency significantly increased in ON L-DOPA dyskinetic 6-hydroxydopamine-lesioned rats, suggesting that increased LHb neuronal activity in response to L-DOPA is related to AIM manifestation. Therefore, to mechanistically test if LHb neuronal activity might affect AIM severity, following induction of AIMs, 6-hydroxydopamine rats were injected with Daun02 in the LHb previously transfected with ß-galactosidase under control of the FosB promoter. Three days after Daun02 administration, animals were tested daily with L-DOPA to assess LID and L-DOPA-induced rotations. Inactivation of ∆FosB-expressing neurons significantly reduced AIM severity and also increased rotations. Interestingly, the dopaminergic D1 receptor was overexpressed only on the lesioned side of dyskinetic rats in LHb and co-localized with ΔFosB, suggesting a D1 receptor-mediated mechanism supporting the LHb involvement in AIMs. CONCLUSIONS: This study highlights the role of LHb in LID, offering a new target to innovative treatments of LID.
BACKGROUND: A systematic search of brain nuclei putatively involved in L-3,4-dihydroxyphenylalanine (L-DOPA)-induced dyskinesia (LID) in Parkinson's disease shed light, notably, upon the lateral habenula (LHb), which displayed an overexpression of the ∆FosB, ARC, and Zif268 immediate-early genes only in rats experiencing abnormal involuntary movements (AIMs). We thus hypothesized that LHb might play a role in LID. METHODS: ∆FosB immunoreactivity, 2-deoxyglucose uptake, and firing activity of LHb were studied in experimental models of Parkinson's disease and LID. ΔFosB-expressing LHb neurons were then targeted using the Daun02-inactivation method. A total of 18 monkeys and 55 rats were used. RESULTS:LHb was found to be metabolically modified in dyskinetic monkeys and its neuronal firing frequency significantly increased in ON L-DOPAdyskinetic6-hydroxydopamine-lesioned rats, suggesting that increased LHb neuronal activity in response to L-DOPA is related to AIM manifestation. Therefore, to mechanistically test if LHb neuronal activity might affect AIM severity, following induction of AIMs, 6-hydroxydopaminerats were injected with Daun02 in the LHb previously transfected with ß-galactosidase under control of the FosB promoter. Three days after Daun02 administration, animals were tested daily with L-DOPA to assess LID and L-DOPA-induced rotations. Inactivation of ∆FosB-expressing neurons significantly reduced AIM severity and also increased rotations. Interestingly, the dopaminergic D1 receptor was overexpressed only on the lesioned side of dyskineticrats in LHb and co-localized with ΔFosB, suggesting a D1 receptor-mediated mechanism supporting the LHb involvement in AIMs. CONCLUSIONS: This study highlights the role of LHb in LID, offering a new target to innovative treatments of LID.
Authors: Elva Fridjonsdottir; Reza Shariatgorji; Anna Nilsson; Theodosia Vallianatou; Luke R Odell; Luke S Schembri; Per Svenningsson; Pierre-Olivier Fernagut; Alan R Crossman; Erwan Bezard; Per E Andrén Journal: Sci Adv Date: 2021-01-06 Impact factor: 14.136