Enhanced firing of locus coeruleus neurons and SK channel dysfunction are conserved in distinct models of prodromal Parkinson’s disease
| Autor: | Lina A. Matschke, Marlene A. Komadowski, Annette Stöhr, Bolam Lee, Martin T. Henrich, Markus Griesbach, Susanne Rinné, Fanni F. Geibl, Wei-Hua Chiu, James B. Koprich, Jonathan M. Brotchie, Aytug K. Kiper, Amalia M. Dolga, Wolfgang H. Oertel, Niels Decher |
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| Přispěvatelé: | Medizin, Groningen Research Institute for Asthma and COPD (GRIAC), Molecular Pharmacology |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Male
Small-Conductance Calcium-Activated Potassium Channels/physiology Small-Conductance Calcium-Activated Potassium Channels Cells Medizin Prodromal Symptoms Inbred C57BL Mice Norepinephrine alpha-Synuclein/metabolism Rotenone Animals ddc:610 Pars Compacta Cells Cultured Parkinson Disease/physiopathology Neurons Cultured Multidisciplinary Animal Parkinson Disease Medical sciences Medicine Mice Inbred C57BL Disease Models Animal nervous system Disease Models alpha-Synuclein Pars Compacta/physiology Locus Coeruleus Norepinephrine/physiology Neurons/physiology Locus Coeruleus/physiology |
| Zdroj: | Scientific Reports, 12(1):3180. Nature Publishing Group |
| ISSN: | 2045-2322 |
| Popis: | Parkinson’s disease (PD) is clinically defined by the presence of the cardinal motor symptoms, which are associated with a loss of dopaminergic nigrostriatal neurons in the substantia nigra pars compacta (SNpc). While SNpc neurons serve as the prototypical cell-type to study cellular vulnerability in PD, there is an unmet need to extent our efforts to other neurons at risk. The noradrenergic locus coeruleus (LC) represents one of the first brain structures affected in Parkinson’s disease (PD) and plays not only a crucial role for the evolving non-motor symptomatology, but it is also believed to contribute to disease progression by efferent noradrenergic deficiency. Therefore, we sought to characterize the electrophysiological properties of LC neurons in two distinct PD models: (1) in an in vivo mouse model of focal α-synuclein overexpression; and (2) in an in vitro rotenone-induced PD model. Despite the fundamental differences of these two PD models, α-synuclein overexpression as well as rotenone exposure led to an accelerated autonomous pacemaker frequency of LC neurons, accompanied by severe alterations of the afterhyperpolarization amplitude. On the mechanistic side, we suggest that Ca2+-activated K+ (SK) channels are mediators of the increased LC neuronal excitability, as pharmacological activation of these channels is sufficient to prevent increased LC pacemaking and subsequent neuronal loss in the LC following in vitro rotenone exposure. These findings suggest a role of SK channels in PD by linking α-synuclein- and rotenone-induced changes in LC firing rate to SK channel dysfunction. |
| Databáze: | OpenAIRE |
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