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Dai M, Li J, Hao X, Li N, Zheng M, He M, Gu Y. High Magnesium Promotes the Recovery of Binocular Vision from Amblyopia via TRPM7. Neurosci Bull 2024:10.1007/s12264-024-01242-x. [PMID: 38833201 DOI: 10.1007/s12264-024-01242-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 03/06/2024] [Indexed: 06/06/2024] Open
Abstract
Abnormal visual experience during the critical period can cause deficits in visual function, such as amblyopia. High magnesium (Mg2+) supplementary can restore ocular dominance (OD) plasticity, which promotes the recovery of amblyopic eye acuity in adults. However, it remains unsolved whether Mg2+ could recover binocular vision in amblyopic adults and what the molecular mechanism is for the recovery. We found that in addition to the recovery of OD plasticity, binocular integration can be restored under the treatment of high Mg2+ in amblyopic mice. Behaviorally, Mg2+-treated amblyopic mice showed better depth perception. Moreover, the effect of high Mg2+ can be suppressed with transient receptor potential melastatin-like 7 (TRPM7) knockdown. Collectively, our results demonstrate that high Mg2+ could restore binocular visual functions from amblyopia. TRPM7 is required for the restoration of plasticity in the visual cortex after high Mg2+ treatment, which can provide possible clinical applications for future research and treatment of amblyopia.
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Affiliation(s)
- Menghan Dai
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Jie Li
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Xiangwen Hao
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Na Li
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Mingfang Zheng
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Miao He
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China
| | - Yu Gu
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai, 200032, China.
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Hu G, Chen A, Ye J, Liu Q, Wang J, Fan C, Wang X, Huang M, Dai M, Shi X, Gu Y. A developmental critical period for ocular dominance plasticity of binocular neurons in mouse superior colliculus. Cell Rep 2024; 43:113667. [PMID: 38184852 DOI: 10.1016/j.celrep.2023.113667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 09/29/2023] [Accepted: 12/25/2023] [Indexed: 01/09/2024] Open
Abstract
Detecting visual features in the environment is crucial for animals' survival. The superior colliculus (SC) is implicated in motion detection and processing, whereas how the SC integrates visual inputs from the two eyes remains unclear. Using in vivo electrophysiology, we show that mouse SC contains many binocular neurons that display robust ocular dominance (OD) plasticity in a critical period during early development, which is similar to, but not dependent on, the primary visual cortex. NR2A- and NR2B-containing N-methyl-D-aspartate (NMDA) receptors play an essential role in the regulation of SC plasticity. Blocking NMDA receptors can largely prevent the impairment of predatory hunting caused by monocular deprivation, indicating that maintaining the binocularity of SC neurons is required for efficient hunting behavior. Together, our studies reveal the existence and function of OD plasticity in SC, which broadens our understanding of the development of subcortical visual circuitry relating to motion detection and predatory hunting.
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Affiliation(s)
- Guanglei Hu
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200032, China; School of Life Sciences, Westlake University, Hangzhou 310000, China
| | - Ailin Chen
- Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China
| | - Jingjing Ye
- Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China; Medical College of Optometry and Ophthalmology, Shandong University of Traditional Chinese Medicine, Jinan 250014, China
| | - Qiong Liu
- School of Life Sciences, Westlake University, Hangzhou 310000, China
| | - Jiafeng Wang
- Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China
| | - Cunxiu Fan
- Jiading Branch of Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, 800 Huangjiahuayuan Road, Shanghai 201803, China
| | - Xiaoqing Wang
- Department of Dermatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Mengqi Huang
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200032, China
| | - Menghan Dai
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200032, China
| | - Xuefeng Shi
- Tianjin Eye Hospital, Tianjin Key Laboratory of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China; Medical College of Optometry and Ophthalmology, Shandong University of Traditional Chinese Medicine, Jinan 250014, China; Institute of Ophthalmology, Nankai University, Tianjin 300020, China.
| | - Yu Gu
- State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science, Institutes of Brain Science, Fudan University, Shanghai 200032, China.
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Wang G, Hou P, Tu Y, Zheng J, Li P, Liu L. Activation of p38 MAPK hinders the reactivation of visual cortical plasticity in adult amblyopic mice. Exp Eye Res 2023; 236:109651. [PMID: 37748716 DOI: 10.1016/j.exer.2023.109651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/30/2023] [Accepted: 09/12/2023] [Indexed: 09/27/2023]
Abstract
OBJECTIVE To investigate the impact of p38 mitogen-activated protein kinase (MAPK) signaling on reactivating visual cortical plasticity in adult amblyopic mice. MATERIALS AND METHODS Reverse suture (RS), environment enrichment (EE), and combined with left intracerebroventricular injection of p38 MAPK inhibitor (SB203580, SB) or p38 MAPK agonist (dehydrocorydaline hydrochloride, DHC) were utilized to treat adult amblyopic mice with monocular deprivation (MD). The visual water task, visual cliff test, and Flash visual-evoked potential were used to measure the visual function. Then, Golgi staining and transmission electron microscopy were used to assess the reactivation of structural plasticity in adult amblyopic mice. Western blot and immunohistochemistry detected the expression of ATF2, PSD-95, p38 MAPK, and phospho-p38 MAPK in the left visual cortex. RESULTS No statistically significant difference was observed in the visual function in each pre-intervention group. Compared to pre-intervention, the visual acuity of deprived eyes was improved significantly, the impairment of visual depth perception was alleviated, and the P wave amplitude and C/I ratio were increased in the EE + RS, the EE + RS + SB, and the EE + RS + DMSO groups, but no significant difference was detected in the EE + RS + DHC group. Compared to EE + RS + DHC group, the density of dendritic spines was significantly higher, the synaptic density of the left visual cortex increased significantly, the length of the active synaptic zone increased, and the thickness of post-synaptic density (PSD) thickened in the left visual cortex of EE + RS, EE + RS + SB, and EE + RS + DMSO groups. And that, the protein expression of p-p38 MAPK increased while that of PSD-95 and ATF2 decreased significantly in the left visual cortex of the EE + RS + DHC group mice. CONCLUSION RS and EE intervention improved the visual function and synaptic plasticity of the visual cortex in adult amblyopic mice. However, activating p38 MAPK hinders the recovery of visual function by upregulating the phosphorylation of p38 MAPK and decreasing the ATF2 protein expression.
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Affiliation(s)
- Guiqu Wang
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China; Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Luzhou, 646000, China
| | - Peixian Hou
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China
| | - Yanqiong Tu
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China
| | - Jing Zheng
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China
| | - Pinxiong Li
- Department of Radiology, The Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Luzhou, 646000, China
| | - Longqian Liu
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China; Department of Optometry and Visual Science, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Wang G, Tu Y, Hou P, Li P, Liu L. Regulatory role of the p38 MAPK/ATF2 signaling pathway in visual function and visual cortical plasticity in mice with monocular deprivation. Neurosci Lett 2023:137353. [PMID: 37393009 DOI: 10.1016/j.neulet.2023.137353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/24/2023] [Accepted: 06/15/2023] [Indexed: 07/03/2023]
Abstract
BACKGROUND This study aimed to examine the role of the p38 mitogen-activated protein kinase (MAPK)/ activating transcription factor 2 (ATF2) signaling in visual function impairment and visual cortical plasticity in mice with monocular deprivation (MD). METHODS Visual behavioral tests, including visual water task, visual cliff test, and flash visual evoked potential, were performed on each group. We studied the density of dendritic spines and the synaptic ultrastructure by Golgi staining and transmission electron microscope. We performed Western blot and immunohistochemistry and detected the expression of ATF2, PSD-95, p38 MAPK, and phosphor-p38 MAPK in the left visual cortex. RESULTS In the MD + SB group, the visual acuity in deprived eyes substantially improved, the impairment of visual depth perception was alleviated, and the P wave amplitude and C/I ratio increased. The density of dendritic spines and the numerical density of synapses increased significantly, the width of the synaptic cleft decreased significantly, and the length of the active synaptic zone and the thickness of post-synaptic density (PSD) increased substantially. The protein expression of phosphor-p38 MAPK decreased, whereas that of PSD-95 and ATF2 increased significantly. CONCLUSIONS Inhibiting the phosphorylation of p38 MAPK and negative feedback upregulated ATF2 expression, alleviated damage to visual function, and protected against synaptic plasticity in mice with MD.
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Affiliation(s)
- Guiqu Wang
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China; Department of Ophthalmology, the Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Luzhou, 646000, China
| | - Yanqiong Tu
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China
| | - Peixian Hou
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China
| | - Pinxiong Li
- Department of Radiology, the Affiliated Hospital of Southwest Medical University, 25 Taiping Street, Luzhou 646000, China
| | - Longqian Liu
- Department of Ophthalmology, West China Hospital, Sichuan University, 37 Guoxue Xiang, Chengdu, 610041, China; Department of Optometry and Visual Science, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Wang G, Liu L. Amblyopia: progress and promise of functional magnetic resonance imaging. Graefes Arch Clin Exp Ophthalmol 2022; 261:1229-1246. [PMID: 36282454 DOI: 10.1007/s00417-022-05826-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 08/14/2022] [Accepted: 09/02/2022] [Indexed: 11/28/2022] Open
Abstract
Amblyopia is a neurodevelopmental disorder characterized by functional deficits in the visual cortex. Functional magnetic resonance imaging (fMRI) is the most commonly used neuroimaging technique for investigating amblyopia. Herein, we systematically searched a PubMed database from inception to December 2021 to highlight the current progress and promises about fMRI technology in amblyopia; amblyopia's neural mechanism, the comparison of different types of amblyopia, and the evaluation of the therapeutic effect were explored. Relevant articles published in English and appropriate cross-references were considered for inclusion, including basic studies, imaging techniques, clinical diagnostic and therapeutic studies, case series, and reviews.
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Affiliation(s)
- Guiqu Wang
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Longqian Liu
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, 610041, China.
- Department of Optometry and Visual Science, West China Hospital, Sichuan University, Chengdu, 610041, China.
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