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Liu Y, Cao LX, Wang WY, Piao YR, Wang JY, Chu CP, Bing YH, Qiu DL. GLP-1 enhances hyperpolarization-activated currents of mouse cerebellar Purkinje cell in vitro. Front Mol Neurosci 2023; 16:1126447. [PMID: 37089690 PMCID: PMC10113493 DOI: 10.3389/fnmol.2023.1126447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 03/16/2023] [Indexed: 04/08/2023] Open
Abstract
Glucagon-like peptide-1 (GLP-1) is mainly secreted by preglucagonergic neurons in the nucleus tractus solitarius, which plays critical roles in regulation of neuronal activity in the central nervous system through its receptor. In the cerebellar cortex, GLP-1 receptor is abundantly expressed in the molecular layer, Purkinje cell (PC) layer and granular layer, indicating that GLP-1 may modulate the cerebellar neuronal activity. In this study, we investigated the mechanism by which GLP1 modulates mouse cerebellar PC activity in vitro. After blockade of glutamatergic and GABAergic synaptic transmission in PCs, GLP1 increased the spike firing rate accompanied by depolarization of membrane potential and significantly depressed the after-hyperpolarizing potential and outward rectifying current of spike firing discharges via GLP1 receptors. In the presence of TTX and Ba2+, GLP1 significantly enhanced the hyperpolarized membrane potential-evoked instant current, steady current, tail current (I-tail) and hyperpolarization-activated (IH) current. Application of a selective IH channel antagonist, ZD7288, blocked IH and abolished the effect of GLP1 on PC membrane currents. The GLP1 induced enhancement of membrane currents was also abolished by a selective GLP1 receptor antagonist, exendin-9-39, as well as by protein kinase A (PKA) inhibitors, KT5720 and H89. In addition, immunofluorescence detected GLP1 receptor in the mouse cerebellar cortex, mostly in PCs. These results indicated that GLP1 receptor activation enhanced IH channel activity via PKA signaling, resulting in increased excitability of mouse cerebellar PCs in vitro. The present findings indicate that GLP1 plays a critical role in modulating cerebellar function by regulating the spike firing activity of mouse cerebellar PCs.
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Affiliation(s)
- Yang Liu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin, China
| | - Li-Xin Cao
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin, China
| | - Wei-Yao Wang
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin, Jilin, China
| | - Yong-Rui Piao
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin, China
- Department of Urology, Affiliated Hospital of Yanbian University, Yanji, Jilin, China
| | - Jun-Ya Wang
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin, China
| | - Chun-Ping Chu
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin, Jilin, China
| | - Yan-Hua Bing
- Functional Experiment Center, College of Medicine, Yanbian University, Yanji, Jilin, China
- *Correspondence: Yan-Hua Bing,
| | - De-Lai Qiu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, Jilin, China
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin, Jilin, China
- De-Lai Qiu, ;
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The Effect of Earthing Mat on Stress-Induced Anxiety-like Behavior and Neuroendocrine Changes in the Rat. Biomedicines 2022; 11:biomedicines11010057. [PMID: 36672565 PMCID: PMC9855809 DOI: 10.3390/biomedicines11010057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 12/28/2022] Open
Abstract
Grounding is a therapeutic technique that involves doing activities that “ground” or electrically reconnect us to the earth. The physiological effects of grounding have been reported from a variety of perspectives such as sleep or pain. However, its anti-stress efficacy is relatively unknown. The present study investigated the stress-related behavioral effects of earthing mat and its neurohormonal mechanisms in the Sprague−Dawley male rat. Rats were randomly divided into four groups: the naïve normal (Normal), the 21 days immobilization stressed (Control), the 21 days stressed + earthing mat for 7 days (A7) or 21 days (A21) group. The depressive-and anxiety like behaviors were measured by forced swimming test (FST), tail suspension test (TST) and elevated plus maze (EPM). Using immunohistochemistry, the expression of corticotrophin-releasing factor (CRF) and c-Fos immunoreactivity were analyzed in the brain. In the EPM, time spent in the open arm of the earthing mat groups was significantly increased compared to the Control group (p < 0.001), even though there were without effects among groups in the FST and TST. The expression of CRF immunoreactive neurons in the earthing mat group was markedly decreased compared to the Control group. Overall, the earthing mat reduced stress-induced behavioral changes and expression of c-Fos and CRF immunoreactivity in the brain. These results suggest that the earthing mat may have the potential to improve stress-related responses via the regulation of the corticotrophinergic system.
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Li GG, Piao CJ, Wan P, Li SY, Wei YX, Zhao GJ, Wu WY, Hong L, Chu CP, Qiu DL. Opposing actions of CRF-R1 and CB1 receptor on facial stimulation-induced MLI-PC plasticity in mouse cerebellar cortex. BMC Neurosci 2022; 23:39. [PMID: 35754033 PMCID: PMC9235104 DOI: 10.1186/s12868-022-00726-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 06/21/2022] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Corticotropin-releasing factor (CRF) is the major neuromodulator orchestrating the stress response, and is secreted by neurons in various regions of the brain. Cerebellar CRF is released by afferents from inferior olivary neurons and other brainstem nuclei in response to stressful challenges, and contributes to modulation of synaptic plasticity and motor learning behavior via its receptors. We recently found that CRF modulates facial stimulation-evoked molecular layer interneuron-Purkinje cell (MLI-PC) synaptic transmission via CRF type 1 receptor (CRF-R1) in vivo in mice, suggesting that CRF modulates sensory stimulation-evoked MLI-PC synaptic plasticity. However, the mechanism of how CRF modulates MLI-PC synaptic plasticity is unclear. We investigated the effect of CRF on facial stimulation-evoked MLI-PC long-term depression (LTD) in urethane-anesthetized mice by cell-attached recording technique and pharmacological methods. RESULTS Facial stimulation at 1 Hz induced LTD of MLI-PC synaptic transmission under control conditions, but not in the presence of CRF (100 nM). The CRF-abolished MLI-PC LTD was restored by application of a selective CRF-R1 antagonist, BMS-763,534 (200 nM), but it was not restored by application of a selective CRF-R2 antagonist, antisauvagine-30 (200 nM). Blocking cannabinoid type 1 (CB1) receptor abolished the facial stimulation-induced MLI-PC LTD, and revealed a CRF-triggered MLI-PC long-term potentiation (LTP) via CRF-R1. Notably, either inhibition of protein kinase C (PKC) with chelerythrine (5 µM) or depletion of intracellular Ca2+ with cyclopiazonic acid (100 µM), completely prevented CRF-triggered MLI-PC LTP in mouse cerebellar cortex in vivo. CONCLUSIONS The present results indicated that CRF blocked sensory stimulation-induced opioid-dependent MLI-PC LTD by triggering MLI-PC LTP through CRF-R1/PKC and intracellular Ca2+ signaling pathway in mouse cerebellar cortex. These results suggest that activation of CRF-R1 opposes opioid-mediated cerebellar MLI-PC plasticity in vivo in mice.
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Affiliation(s)
- Guang-Gao Li
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China.,Department of Osteology, Affiliated Hospital of Yanbian University, Yanji, 133000, Jilin, China
| | - Chun-Jian Piao
- Grade 2019 College Students Major in Clinical Medicine, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China
| | - Peng Wan
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin City, Jilin, China
| | - Shu-Yu Li
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China
| | - Yu-Xuan Wei
- Grade 2019 College Students Major in Clinical Medicine, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China
| | - Guo-Jun Zhao
- Grade 2019 College Students Major in Clinical Medicine, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China
| | - Wen-Yuan Wu
- Department of Urology, Affiliated Hospital of Yanbian University, Yanji, 133000, Jilin, China
| | - Lan Hong
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China.
| | - Chun-Ping Chu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China.,Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin City, Jilin, China
| | - De-Lai Qiu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, 133002, Jilin, China. .,Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin City, Jilin, China.
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Lu D, Wan P, Liu Y, Jin XH, Chu CP, Bing YH, Qiu DL. Facial Stimulation Induces Long-Term Potentiation of Mossy Fiber-Granule Cell Synaptic Transmission via GluN2A-Containing N-Methyl-D-Aspartate Receptor/Nitric Oxide Cascade in the Mouse Cerebellum. Front Cell Neurosci 2022; 16:863342. [PMID: 35431815 PMCID: PMC9005984 DOI: 10.3389/fncel.2022.863342] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Accepted: 03/01/2022] [Indexed: 12/21/2022] Open
Abstract
Long-term synaptic plasticity in the cerebellar cortex is a possible mechanism for motor learning. Previous studies have demonstrated the induction of mossy fiber-granule cell (MF-GrC) synaptic plasticity under in vitro and in vivo conditions, but the mechanisms underlying sensory stimulation-evoked long-term synaptic plasticity of MF-GrC in living animals are unclear. In this study, we investigated the mechanism of long-term potentiation (LTP) of MF-GrC synaptic transmission in the cerebellum induced by train of facial stimulation at 20 Hz in urethane-anesthetized mice using electrophysiological recording, immunohistochemistry techniques, and pharmacological methods. Blockade of GABAA receptor activity and repetitive facial stimulation at 20 Hz (240 pulses) induced an LTP of MF-GrC synapses in the mouse cerebellar cortical folium Crus II, accompanied with a decrease in paired-pulse ratio (N2/N1). The facial stimulation-induced MF-GrC LTP was abolished by either an N-methyl-D-aspartate (NMDA) receptor blocker, i.e., D-APV, or a specific GluNR2A subunit-containing NMDA receptor antagonist, PEAQX, but was not prevented by selective GluNR2B or GluNR2C/D subunit-containing NMDA receptor blockers. Application of GNE-0723, a selective and brain-penetrant-positive allosteric modulator of GluN2A subunit-containing NMDA receptors, produced an LTP of N1, accompanied with a decrease in N2/N1 ratio, and occluded the 20-Hz facial stimulation-induced MF-GrC LTP. Inhibition of nitric oxide synthesis (NOS) prevented the facial stimulation-induced MF-GrC LTP, while activation of NOS produced an LTP of N1, with a decrease in N2/N1 ratio, and occluded the 20-Hz facial stimulation-induced MF-GrC LTP. In addition, GluN2A-containing NMDA receptor immunoreactivity was observed in the mouse cerebellar granular layer. These results indicate that facial stimulation at 20 Hz induced LTP of MF-GrC synaptic transmission via the GluN2A-containing NMDA receptor/nitric oxide cascade in mice. The results suggest that the sensory stimulation-evoked LTP of MF-GrC synaptic transmission in the granular layer may play a critical role in cerebellar adaptation to native mossy fiber excitatory inputs and motor learning behavior in living animals.
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Affiliation(s)
- Di Lu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, China
- Department of Ophthalmology, Affiliated Hospital of Yanbian University, Yanji, China
| | - Peng Wan
- Department of Neurology, Affiliated Hospital of Yanbian University, Yanji, China
| | - Yang Liu
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, China
- Department of Ophthalmology, Affiliated Hospital of Yanbian University, Yanji, China
| | - Xian-Hua Jin
- Department of Neurology, Affiliated Hospital of Yanbian University, Yanji, China
| | - Chun-Ping Chu
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin, China
| | - Yan-Hua Bing
- Department of Physiology and Pathophysiology, College of Medicine, Yanbian University, Yanji, China
- *Correspondence: Yan-Hua Bing,
| | - De-Lai Qiu
- Department of Physiology, College of Basic Medicine, Jilin Medical University, Jilin, China
- *Correspondence: Yan-Hua Bing,
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Activation CRF-R2 augments cerebellar climbing fiber-Purkinje cell synaptic transmission via presynaptic PKA pathway in mice. Neurosci Lett 2022; 777:136584. [DOI: 10.1016/j.neulet.2022.136584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/12/2022] [Accepted: 03/18/2022] [Indexed: 11/18/2022]
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