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Antonucci S, Caron G, Dikwella N, Krishnamurty SS, Harster A, Zarrin H, Tahanis A, Heuvel FO, Danner SM, Ludolph A, Grycz K, Baczyk M, Zytnicki D, Roselli F. Non-canonical adrenergic neuromodulation of motoneuron intrinsic excitability through β-receptors in wild-type and ALS mice. bioRxiv 2024:2024.03.25.586570. [PMID: 38585891 PMCID: PMC10996613 DOI: 10.1101/2024.03.25.586570] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Altered neuronal excitability and synaptic inputs to motoneurons are part of the pathophysiology of Amyotrophic Lateral Sclerosis. The cAMP/PKA pathway regulates both of them but therapeutic interventions at this level are limited by the lack of knowledge about suitable pharmacological entry points. Here we used transcriptomics on microdissected and in situ motoneurons to reveal the modulation of PKA-coupled receptorome in SOD1(G93A) ALS mice, vs WT, demonstrating the dysregulation of multiple PKA-coupled GPCRs, in particular on vulnerable MNs, and the relative sparing of β-adrenergic receptors. In vivo MN electrophysiology showed that β2/β3 agonists acutely increase excitability, in particular the input/output relationship, demonstrating a non-canonical adrenergic neuromodulation mediated by β2/β3 receptors both in WT and SOD1 mice. The excitability increase corresponds to the upregulation of immediate-early gene expression and dysregulation of ion channels transcriptome. However the β2/β3 neuromodulation is submitted to a strong homeostasis, since a ten days delivery of β2/β3 agonists results in an abolition of the excitability increase. The homeostatic response is largely caused by a substantial downregulation of PKA-coupled GPCRs in MNs from WT and SOD1 mice. Thus, β-adrenergic receptors are physiologically involved in the regulation of MN excitability and transcriptomics, but, intriguingly, a strong homeostatic response is triggered upon chronic pharmacologic intervention.
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Affiliation(s)
| | - Guillaume Caron
- Université Paris Cité, CNRS, Saints-Pères Paris Institute for the Neurosciences, Paris, France
| | | | | | - Anthony Harster
- Université Paris Cité, CNRS, Saints-Pères Paris Institute for the Neurosciences, Paris, France
| | | | | | | | - Simon M. Danner
- Department of Neurobiology and Anatomy, College of Medicine, Drexel University, Philadelphia, United States
| | - Albert Ludolph
- Dept. of Neurology, Ulm University, Ulm, DE
- German Center for Neurodegenerative Diseases (DZNE)-Ulm, DE
| | - Kamil Grycz
- Dept. of Neurobiology, Poznan University of Physical Education, Poland
| | - Marcin Baczyk
- Dept. of Neurobiology, Poznan University of Physical Education, Poland
| | - Daniel Zytnicki
- Université Paris Cité, CNRS, Saints-Pères Paris Institute for the Neurosciences, Paris, France
| | - Francesco Roselli
- Dept. of Neurology, Ulm University, Ulm, DE
- German Center for Neurodegenerative Diseases (DZNE)-Ulm, DE
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