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Liu C, Liu WH, Yang W, Chen L, Xue Y, Chen XY. GLP-1 modulated the firing activity of nigral dopaminergic neurons in both normal and parkinsonian mice. Neuropharmacology 2024; 252:109946. [PMID: 38599494 DOI: 10.1016/j.neuropharm.2024.109946] [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: 01/26/2024] [Revised: 03/27/2024] [Accepted: 04/07/2024] [Indexed: 04/12/2024]
Abstract
The spontaneous firing activity of nigral dopaminergic neurons is associated with some important roles including modulation of dopamine release, expression of tyrosine hydroxylase (TH), as well as neuronal survival. The decreased neuroactivity of nigral dopaminergic neurons has been revealed in Parkinson's disease. Central glucagon-like peptide-1 (GLP-1) functions as a neurotransmitter or neuromodulator to exert multiple brain functions. Although morphological studies revealed the expression of GLP-1 receptors (GLP-1Rs) in the substantia nigra pars compacta, the possible modulation of GLP-1 on spontaneous firing activity of nigral dopaminergic neurons is unknown. The present extracellular in vivo single unit recordings revealed that GLP-1R agonist exendin-4 significantly increased the spontaneous firing rate and decreased the firing regularity of partial nigral dopaminergic neurons of adult male C57BL/6 mice. Blockade of GLP-1Rs by exendin (9-39) decreased the firing rate of nigral dopaminergic neurons suggesting the involvement of endogenous GLP-1 in the modulation of firing activity. Furthermore, the PKA and the transient receptor potential canonical (TRPC) 4/5 channels are involved in activation of GLP-1Rs-induced excitatory effects of nigral dopaminergic neurons. Under parkinsonian state, both the exogenous and endogenous GLP-1 could still induce excitatory effects on the surviving nigral dopaminergic neurons. As the mild excitatory stimuli exert neuroprotective effects on nigral dopaminergic neurons, the present GLP-1-induced excitatory effects may partially contribute to its antiparkinsonian effects.
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Affiliation(s)
- Cui Liu
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China; Department of Histology and Embryology, School of Clinical and Basic Medical Sciences, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Wen-Hong Liu
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Wu Yang
- Department of International Medicine, Affiliated Hospital of Qingdao University, Qingdao, China
| | - Lei Chen
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Yan Xue
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Xin-Yi Chen
- Department of International Medicine, Affiliated Hospital of Qingdao University, Qingdao, China.
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Juárez EH, Wood CR, Davies R, Kehoe O, Johnson WEB, Merighi A, Ferrini F. ST2-Conditioned Medium Fosters Dorsal Horn Cell Excitability and Synaptic Transmission in Cultured Mouse Spinal Cord. Stem Cell Rev Rep 2023; 19:2918-2928. [PMID: 37674016 PMCID: PMC10661801 DOI: 10.1007/s12015-023-10618-x] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2023] [Indexed: 09/08/2023]
Abstract
Conditioned medium obtained from bone marrow-derived stem cells has been proposed as a novel cell-free therapy in spinal cord injury and neuropathic pain, yet the direct effect on spinal neuron function has never been investigated. Here, we adopted spinal cord organotypic cultures (SCOCs) as an experimental model to probe the effect of ST2 murine mesenchymal stem cells-conditioned medium (ST2-CM) on dorsal horn (DH) neuron functional properties. Three days of SCOC exposure to ST2-CM increased neuronal activity measured by Fos expression, as well as spontaneous or induced firing. We showed that the increase in neuronal excitability was associated with changes in both intrinsic membrane properties and an enhanced excitatory drive. The increased excitability at the single-cell level was substantiated at the network level by detecting synchronous bursts of calcium waves across DH neurons. Altogether, SCOCs represent a viable tool to probe mesenchymal cells' effect on intact neuronal networks. Our findings indicate that ST2-CM enhances neuronal activity and synaptic wiring in the spinal dorsal horn. Our data also support the trophic role of mesenchymal cells CM in maintaining network activity in spinal circuits.
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Affiliation(s)
- Esri H Juárez
- Department of Veterinary Sciences, University of Turin, Largo Paolo Braccini 2, I-10095, Grugliasco, TO, Italy
| | - Chelsea R Wood
- Chester Medical School, University of Chester, Parkgate Road, Chester, CH1 4BJ, UK
- School of Life Sciences, Coventry University, Coventry, CV1 2DS, UK
| | - Rebecca Davies
- Centre for Regenerative Medicine Research, School of Medicine, Keele University, Keele, Staffordshire, ST5 5BG, UK
- Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry, Shropshire, SY10 7AG, UK
| | - Oksana Kehoe
- Centre for Regenerative Medicine Research, School of Medicine, Keele University, Keele, Staffordshire, ST5 5BG, UK
- Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry, Shropshire, SY10 7AG, UK
| | - William E B Johnson
- Chester Medical School, University of Chester, Parkgate Road, Chester, CH1 4BJ, UK
| | - Adalberto Merighi
- Department of Veterinary Sciences, University of Turin, Largo Paolo Braccini 2, I-10095, Grugliasco, TO, Italy
| | - Francesco Ferrini
- Department of Veterinary Sciences, University of Turin, Largo Paolo Braccini 2, I-10095, Grugliasco, TO, Italy.
- Department of Psychiatry and Neuroscience, Université Laval, Québec, G1K 7P4, Canada.
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Chen L, Liu C, Xue Y, Chen XY. Several neuropeptides involved in parkinsonian neuroprotection modulate the firing properties of nigral dopaminergic neurons. Neuropeptides 2023; 99:102337. [PMID: 37087783 DOI: 10.1016/j.npep.2023.102337] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 03/30/2023] [Accepted: 04/12/2023] [Indexed: 04/25/2023]
Abstract
Parkinson's disease is characterized by progressive degeneration of dopaminergic neurons in the substantia nigra pars compacta. The surviving nigral dopaminergic neurons display altered spontaneous firing activity in Parkinson's disease. The firing rate of nigral dopaminergic neurons decreases long before complete neuronal death and the appearance of parkinsonian symptoms. A mild stimulation could rescue dopaminergic neurons from death and in turn play neuroprotective effects. Several neuropeptides, including cholecystokinin (CCK), ghrelin, neurotensin, orexin, tachykinins and apelin, within the substantia nigra pars compacta play important roles in the modulation of spontaneous firing activity of dopaminergic neurons and therefore involve motor control and motor disorders. Here, we review neuropeptide-induced modulation of the firing properties of nigral dopaminergic neurons. This review may provide a background to guide further investigations into the involvement of neuropeptides in movement control by modulating firing activity of nigral dopaminergic neurons in Parkinson's disease.
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Affiliation(s)
- Lei Chen
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China.
| | - Cui Liu
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Yan Xue
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Xin-Yi Chen
- Department of International Medicine, Affiliated Hospital of Qingdao University, Qingdao, China.
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Chen XY, Liu C, Xue Y, Chen L. Changed firing activity of nigra dopaminergic neurons in Parkinson's disease. Neurochem Int 2023; 162:105465. [PMID: 36563966 DOI: 10.1016/j.neuint.2022.105465] [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: 09/26/2022] [Revised: 12/11/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
Parkinson's disease is the second most common neurodegenerative disease which is characterized by selective degeneration of dopaminergic neurons in the substantia nigra pars compacta. The intrinsic neuronal firing activity is critical for the functional organization of brain and the specific deficits of neuronal firing activity may be associated with different brain disorders. It is known that the surviving nigra dopaminergic neurons exhibit altered firing activity, such as decreased spontaneous firing frequency, reduced number of firing neurons and increased burst firing in Parkinson's disease. Several ionic mechanisms are involved in changed firing activity of dopaminergic neurons under parkinsonian state. In this review, we summarize the changes of spontaneous firing activity as well as the possible mechanisms of nigra dopaminergic neurons in Parkinson's disease. This review may let us clearly understand the involvement of neuronal firing activity of nigra dopaminergic neurons in Parkinson's disease.
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Affiliation(s)
- Xin-Yi Chen
- Department of International Medicine, Affiliated Hospital of Qingdao University, Qingdao, China.
| | - Cui Liu
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Yan Xue
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China
| | - Lei Chen
- Department of Physiology and Pathophysiology, School of Basic Medicine, Qingdao University, Qingdao, China.
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Cheng Y, Xu J, Zeng R, Zhao X, Gao W, Quan J, Hu X, Shen Z, Zhang J. The Role of Prostaglandin E2 Synthesized in Rat Lateral Parabrachial Nucleus in LPS-Induced Fever. Neuroendocrinology 2022; 112:399-416. [PMID: 34348333 DOI: 10.1159/000518491] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 07/15/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION The lateral parabrachial nucleus (LPBN) is considered to be a brain site of the pyrogenic action of prostaglandin (PG) E2 outside of the preoptic area. Yet, the role of the LPBN in fever following a systemic immune challenge remains poorly understood. METHODS We examined the expression of cyclooxygenase-2 (COX-2) and microsomal PGE synthase-1 (mPGES-1) in the LPBN after the intraperitoneal injection of lipopolysaccharide (LPS). We investigated the effects of LPBN NS-398 (COX-2 inhibitor) on LPS-induced fever, the effects of direct LPBN PGE2 administration on the energy expenditure (EE), brown adipose tissue (BAT) thermogenesis, neck muscle electromyographic activity and tail temperature, and the effects of PGE2 on the spontaneous firing activity and thermosensitivity of in vitro LPBN neurons in a brain slice. RESULTS The COX-2 and mPGES-1 enzymes were upregulated at both mRNA and protein levels. The microinjection of NS-398 in the LPBN attenuated the LPS-induced fever. Direct PGE2 administration in the LPBN resulted in a febrile response by a coordinated response of increased EE, BAT thermogenesis, shivering, and possibly decreased heat loss through the tail. The LPBN neurons showed a clear anatomical distinction in the firing rate response to PGE2, with the majority of PGE2-excited or -inhibited neurons being located in the external lateral or dorsal subnucleus of the LPBN, respectively. However, neither the firing rate nor the thermal coefficient response to PGE2 showed any difference between warm-sensitive, cold-sensitive, and temperature-insensitive neurons in the LPBN. CONCLUSIONS PGE2 synthesized in the LPBN was at least partially involved in LPS-induced fever via its different modulations of the firing rate of neurons in different LPBN subnuclei.
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Affiliation(s)
- Yongjing Cheng
- Key Laboratory of Thermoregulation and Inflammation of Sichuan Higher Education Institutes, Chengdu Medical College, Chengdu, China
| | - Jianhui Xu
- Key Laboratory of Thermoregulation and Inflammation of Sichuan Higher Education Institutes, Chengdu Medical College, Chengdu, China
| | - Ruixin Zeng
- School of Dentistry, Zunyi Medical University, Zunyi, China
| | - Xi Zhao
- School of Clinical Medicine, Chengdu Medical College, Chengdu, China
| | - Wenmin Gao
- Key Laboratory of Thermoregulation and Inflammation of Sichuan Higher Education Institutes, Chengdu Medical College, Chengdu, China
| | - Junru Quan
- School of Clinical Medicine, Chengdu Medical College, Chengdu, China
| | - Xiaosong Hu
- School of Basic Medicine, Chengdu Medical College, Chengdu, China
| | - Ziling Shen
- School of Basic Medicine, Chengdu Medical College, Chengdu, China
| | - Jie Zhang
- Key Laboratory of Thermoregulation and Inflammation of Sichuan Higher Education Institutes, Chengdu Medical College, Chengdu, China
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Moiseev KY, Spirichev AA, Vishnyakova PA, Pankrasheva LG, Masliukov PM. Changes of discharge properties of neurons from dorsomedial hypothalamic nuclei during aging in rats. Neurosci Lett 2021; 762:136168. [PMID: 34389479 DOI: 10.1016/j.neulet.2021.136168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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] [Revised: 07/28/2021] [Accepted: 08/05/2021] [Indexed: 10/20/2022]
Abstract
The hypothalamus is a vital brain center that is participated in the integration of the endocrine and nervous systems and control of the homeostasis and aging. Spontaneous firing activity from single neurons of the dorsomedial hypothalamic nucleus (DMN) was studied extracellularly in vivo in urethane-anaesthetized rats. The discharge patterns of the majority of DMN neurons were irregular, including periods of relatively stable activity interrupted by pauses. Based on the features of interval interspike histogram, we have selected neurons with an irregular arrhythmic activity (50% in young, 46% in adult and 44% in aged rats), with a constant rhythmic activity (18% of neurons in young, 19% in adult and 23% in aged rats), with a wide interspike interval distribution (22% in young, 26% in adult and 25% in aged rats) and cells with bursts of two or three spikes (10% in young, 9% in adult and 8% in aged rats). The firing rate of DMN neurons was 2.5 ± 0.12 Hz in young and 2.4 ± 0.21 Hz in adult rats and significantly decreased to 1.8 ± 0.17 Hz in aged rats.
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Valente P, Lignani G, Medrihan L, Bosco F, Contestabile A, Lippiello P, Ferrea E, Schachner M, Benfenati F, Giovedì S, Baldelli P. Cell adhesion molecule L1 contributes to neuronal excitability regulating the function of voltage-gated Na+ channels. J Cell Sci 2016; 129:1878-91. [PMID: 26985064 DOI: 10.1242/jcs.182089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 10/19/2015] [Accepted: 03/08/2016] [Indexed: 02/05/2023] Open
Abstract
L1 (also known as L1CAM) is a trans-membrane glycoprotein mediating neuron-neuron adhesion through homophilic and heterophilic interactions. Although experimental evidence has implicated L1 in axonal outgrowth, fasciculation and pathfinding, its contribution to voltage-gated Na(+) channel function and membrane excitability has remained unknown. Here, we show that firing rate, single cell spiking frequency and Na(+) current density are all reduced in hippocampal excitatory neurons from L1-deficient mice both in culture and in slices owing to an overall reduced membrane expression of Na(+) channels. Remarkably, normal firing activity was restored when L1 was reintroduced into L1-deficient excitatory neurons, indicating that abnormal firing patterns are not related to developmental abnormalities, but are a direct consequence of L1 deletion. Moreover, L1 deficiency leads to impairment of action potential initiation, most likely due to the loss of the interaction of L1 with ankyrin G that produces the delocalization of Na(+) channels at the axonal initial segment. We conclude that L1 contributes to functional expression and localization of Na(+) channels to the neuronal plasma membrane, ensuring correct initiation of action potential and normal firing activity.
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Affiliation(s)
- Pierluigi Valente
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy
| | - Gabriele Lignani
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Lucian Medrihan
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Federica Bosco
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy
| | - Andrea Contestabile
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Pellegrino Lippiello
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy
| | - Enrico Ferrea
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Melitta Schachner
- Center for Neuroscience, Shantou University Medical College, 22 Xin Ling Road, Shantou, Guangdong 515041, China
| | - Fabio Benfenati
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
| | - Silvia Giovedì
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy
| | - Pietro Baldelli
- Department of Experimental Medicine, University of Genova, Viale Benedetto XV, 3, Genova 16132, Italy Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Largo Rosanna Benzi 10, Genova 16132, Italy
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