1
|
Khsime I, Boulain M, Fettah A, Chagraoui A, Courtand G, De Deurwaerdère P, Juvin L, Barrière G. Limiting Monoamines Degradation Increases L-DOPA Pro-Locomotor Action in Newborn Rats. Int J Mol Sci 2023; 24:14747. [PMID: 37834195 PMCID: PMC10572489 DOI: 10.3390/ijms241914747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/20/2023] [Accepted: 09/25/2023] [Indexed: 10/15/2023] Open
Abstract
L-DOPA, the precursor of catecholamines, exerts a pro-locomotor action in several vertebrate species, including newborn rats. Here, we tested the hypothesis that decreasing the degradation of monoamines can promote the pro-locomotor action of a low, subthreshold dose of L-DOPA in five-day-old rats. The activity of the degrading pathways involving monoamine oxidases or catechol-O-methyltransferase was impaired by injecting nialamide or tolcapone, respectively. At this early post-natal stage, the capacity of the drugs to trigger locomotion was investigated by monitoring the air-stepping activity expressed by the animals suspended in a harness above the ground. We show that nialamide (100 mg/kg) or tolcapone (100 mg/kg), without effect on their own promotes maximal expression of air-stepping sequences in the presence of a sub-effective dose of L-DOPA (25 mg/kg). Tissue measurements of monoamines (dopamine, noradrenaline, serotonin and some of their metabolites) in the cervical and lumbar spinal cord confirmed the regional efficacy of each inhibitor toward their respective enzyme. Our experiments support the idea that the raise of monoamines boost L-DOPA's locomotor action. Considering that both inhibitors differently altered the spinal monoamines levels in response to L-DOPA, our data also suggest that maximal locomotor response can be reached with different monoamines environment.
Collapse
Affiliation(s)
- Inès Khsime
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| | - Marie Boulain
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| | - Abderrahman Fettah
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| | - Abdeslam Chagraoui
- Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, UNIROUEN, INSERM U1239, Institute for Research and Innovation in Biomedicine of Normandy (IRIB), F-76000 Rouen, France;
- Department of Medical Biochemistry, Rouen University Hospital, CHU de Rouen, F-76000 Rouen, France
| | - Gilles Courtand
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| | | | - Laurent Juvin
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| | - Grégory Barrière
- Univ. Bordeaux, CNRS, INCIA, UMR5287, F-33000 Bordeaux, France (A.F.); (G.C.); (L.J.)
| |
Collapse
|
2
|
Boulain M, Yuan W, Oueghlani Z, Khsime I, Salvi V, Courtand G, Halgand C, Morin D, de Deurwaerdere P, Barrière G, Juvin L. L-DOPA and 5-HTP modulation of air-stepping in newborn rats. J Physiol 2021; 599:4455-4476. [PMID: 34411301 DOI: 10.1113/jp281983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 08/03/2021] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS In newborn rats, L-DOPA increases the occurrence of air-stepping activity without affecting movement characteristics. L-DOPA administration increases the spinal content of dopamine in a dose-dependent manner. Injection of 5-HTP increases the spinal serotonin content but does not trigger air-stepping. 5-HTP counteracts the pro-locomotor action of L-DOPA. Less dopamine and serotonin are synthesized when L-DOPA and 5-HTP are administered as a cocktail. ABSTRACT The catecholamine precursor, L-3,4-dihydroxyphenylalanine (L-DOPA), is a well-established pharmacological agent for promoting locomotor action in vertebrates, including triggering air-stepping activities in the neonatal rat. Serotonin is also a well-known neuromodulator of the rodent spinal locomotor networks. Here, using kinematic analysis, we compared locomotor-related activities expressed by newborn rats in response to varying doses of L-DOPA and the serotonin precursor 5-hydroxytryptophan (5-HTP) administered separately or in combination. L-DOPA alone triggered episodes of air-stepping in a dose-dependent manner (25-100 mg/kg), notably determining the duration of locomotor episodes, but without affecting step cycle frequency or amplitude. In contrast, 5-HTP (25-150 mg/kg) was ineffective in instigating air-stepping, but altered episode durations of L-DOPA-induced air-stepping, and decreased locomotor cycle frequency. High performance liquid chromatography revealed that L-DOPA, which was undetectable in control conditions, accumulated in a dose-dependent manner in the lumbar spinal cord 30 min after its administration. This was paralleled by an increase in dopamine levels, whereas the spinal content of noradrenaline and serotonin remained unaffected. In the same way, the spinal levels of serotonin increased in parallel with the dose of 5-HTP without affecting the levels of dopamine and noradrenaline. When both precursors are administrated, they counteract each other for the production of serotonin and dopamine. Our data thus indicate for the first time that both L-DOPA and 5-HTP exert opposing neuromodulatory actions on air-stepping behaviour in the developing rat, and we speculate that competition for the production of dopamine and serotonin occurs when they are administered as a cocktail.
Collapse
Affiliation(s)
- Marie Boulain
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Wei Yuan
- Department of Orthopedics, The First Hospital of China Medical University, Shenyang, China
| | - Zied Oueghlani
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Inès Khsime
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Vianney Salvi
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Gilles Courtand
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Christophe Halgand
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Didier Morin
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | | | - Grégory Barrière
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| | - Laurent Juvin
- CNRS, EPHE, INCIA, University of Bordeaux, UMR5287 F-33000, Bordeaux, France
| |
Collapse
|
3
|
Boulain M, Khsime I, Sourioux M, Thoby-Brisson M, Barrière G, Simmers J, Morin D, Juvin L. Synergistic interaction between sensory inputs and propriospinal signalling underlying quadrupedal locomotion. J Physiol 2021; 599:4477-4496. [PMID: 34412148 DOI: 10.1113/jp281861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 08/05/2021] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Stimulation of hindlimb afferent fibres can both stabilize and increase the activity of fore- and hindlimb motoneurons during fictive locomotion. The increase in motoneuron activity is at least partially due to the production of doublets of action potentials in a subpopulation of motoneurons. These results were obtained using an in vitro brainstem/spinal cord preparation of neonatal rat. ABSTRACT Quadrupedal locomotion relies on a dynamic coordination between central pattern generators (CPGs) located in the cervical and lumbar spinal cord, and controlling the fore- and hindlimbs, respectively. It is assumed that this CPG interaction is achieved through separate closed-loop processes involving propriospinal and sensory pathways. However, the functional consequences of a concomitant involvement of these different influences on the degree of coordination between the fore- and hindlimb CPGs is still largely unknown. Using an in vitro brainstem/spinal cord preparation of neonatal rat, we found that rhythmic, bilaterally alternating stimulation of hindlimb sensory input pathways elicited coordinated hindlimb and forelimb CPG activity. During pharmacologically induced fictive locomotion, lumbar dorsal root (DR) stimulation entrained and stabilized an ongoing cervico-lumbar locomotor-like rhythm and increased the amplitude of both lumbar and cervical ventral root bursting. The increase in cervical burst amplitudes was correlated with the occurrence of doublet action potential firing in a subpopulation of motoneurons, enabling the latter to transition between low and high frequency discharge according to the intensity of DR stimulation. Moreover, our data revealed that propriospinal and sensory pathways act synergistically to strengthen cervico-lumbar interactions. Indeed, split-bath experiments showed that fully coordinated cervico-lumbar fictive locomotion was induced by combining pharmacological stimulation of either the lumbar or cervical CPGs with lumbar DR stimulation. This study thus highlights the powerful interactions between sensory and propriospinal pathways which serve to ensure the coupling of the fore- and hindlimb CPGs for effective quadrupedal locomotion.
Collapse
Affiliation(s)
- Marie Boulain
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Inès Khsime
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Mélissa Sourioux
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Muriel Thoby-Brisson
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Grégory Barrière
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - John Simmers
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Didier Morin
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| | - Laurent Juvin
- Institut de Neurosciences Cognitives et Intégratives d'Aquitaine, Unité Mixte de Recherche 5287, CNRS, Université de Bordeaux, CNRS, EPHE, INCIA, UMR5287 F-33000, Bordeaux, France
| |
Collapse
|