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Han Y, Chen K, Yu H, Cui C, Li H, Hu Y, Zhang B, Li G. Maf1 loss regulates spinogenesis and attenuates cognitive impairment in Alzheimer's disease. Brain 2024; 147:2128-2143. [PMID: 38226680 PMCID: PMC11146433 DOI: 10.1093/brain/awae015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 01/04/2024] [Accepted: 01/08/2024] [Indexed: 01/17/2024] Open
Abstract
Alzheimer's disease is neurodegenerative and characterized by progressive cognitive impairment. Synaptic dysfunction appears in the early stage of Alzheimer's disease and is significantly correlated with cognitive impairment. However, the specific regulatory mechanism remains unclear. Here, we found the transcription factor Maf1 to be upregulated in Alzheimer's disease and determined that conditional knockout of Maf1 in a transgenic mouse model of Alzheimer's disease restored learning and memory function; the downregulation of Maf1 reduced the intraneuronal calcium concentration and restored neuronal synaptic morphology. We also demonstrated that Maf1 regulated the expression of NMDAR1 by binding to the promoter region of Grin1, further regulating calcium homeostasis and synaptic remodelling in neurons. Our results clarify the important role and mechanism of the Maf1-NMDAR1 signalling pathway in stabilizing synaptic structure, neuronal function and behaviour during Alzheimer's disease pathogenesis. This therefore serves as a potential diagnostic and therapeutic target for the early stage of Alzheimer's disease.
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Affiliation(s)
- Yingying Han
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Kui Chen
- Department of Neurosurgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai 200092, China
| | - Hongxiang Yu
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Can Cui
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Hongxia Li
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Yongbo Hu
- Department of Neurology, the First Affiliated Hospital of Naval Medical University (Shanghai Changhai Hospital), the Second Military Medical University, Shanghai 200092, China
| | - Bei Zhang
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
| | - Gang Li
- Department of Neurology, Shanghai East Hospital, School of Medicine, Tongji University, Shanghai 200092, China
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Tsang CK, Mi Q, Su G, Hwa Lee G, Xie X, D'Arcangelo G, Huang L, Steven Zheng XF. Maf1 is an intrinsic suppressor against spontaneous neural repair and functional recovery after ischemic stroke. J Adv Res 2023; 51:73-90. [PMID: 36402285 PMCID: PMC10491990 DOI: 10.1016/j.jare.2022.11.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/28/2022] [Accepted: 11/13/2022] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION Spontaneous recovery after CNS injury is often very limited and incomplete, leaving most stroke patients with permanent disability. Maf1 is known as a key growth suppressor in proliferating cells. However, its role in neuronal cells after stroke remains unclear. OBJECTIVE We aimed to investigate the mechanistic role of Maf1 in spontaneous neural repair and evaluated the therapeutic effect of targeting Maf1 on stroke recovery. METHODS We used mouse primary neurons to determine the signaling mechanism of Maf1, and the cleavage-under-targets-and-tagmentation-sequencing to map the whole-genome promoter binding sites of Maf1 in isolated mature cortical neurons. Photothrombotic stroke model was used to determine the therapeutic effect on neural repair and functional recovery by AAV-mediated Maf1 knockdown. RESULTS We found that Maf1 mediates mTOR signaling to regulate RNA polymerase III (Pol III)-dependent rRNA and tRNA transcription in mouse cortical neurons. mTOR regulates neuronal Maf1 phosphorylation and subcellular localization. Maf1 knockdown significantly increases Pol III transcription, neurite outgrowth and dendritic spine formation in neurons. Conversely, Maf1 overexpression suppresses such activities. In response to photothrombotic stroke in mice, Maf1 expression is increased and accumulates in the nucleus of neurons in the peripheral region of infarcted cortex, which is the key region for neural remodeling and repair during spontaneous recovery. Intriguingly, Maf1 knockdown in the peri-infarct cortex significantly enhances neural plasticity and functional recovery. Mechanistically, Maf1 not only interacts with the promoters and represses Pol III-transcribed genes, but also those of CREB-associated genes that are critical for promoting plasticity during neurodevelopment and neural repair. CONCLUSION These findings indicate Maf1 as an intrinsic neural repair suppressor against regenerative capability of mature CNS neurons, and suggest that Maf1 is a potential therapeutic target for enhancing functional recovery after ischemic stroke and other CNS injuries.
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Affiliation(s)
- Chi Kwan Tsang
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Rutgers Cancer Institute of New Jersey, 195 Little Albany Street, New Brunswick, NJ 08903, USA.
| | - Qiongjie Mi
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Department of Neurology, The First Clinical Medical School of Jinan University, Guangzhou, China
| | - Guangpu Su
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Department of Neurology, The First Clinical Medical School of Jinan University, Guangzhou, China
| | - Gum Hwa Lee
- Department of Cell Biology and Neuroscience, Rutgers, the State University of New Jersey, Piscataway, NJ 08854, USA
| | - Xuemin Xie
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Department of Neurology, The First Clinical Medical School of Jinan University, Guangzhou, China
| | - Gabriella D'Arcangelo
- Department of Cell Biology and Neuroscience, Rutgers, the State University of New Jersey, Piscataway, NJ 08854, USA
| | - Li'an Huang
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Department of Neurology, The First Clinical Medical School of Jinan University, Guangzhou, China; Department of Neurology and Stroke Center, The First Affiliated Hospital, Jinan University Guangzhou, Guangdong, China.
| | - X F Steven Zheng
- Rutgers Cancer Institute of New Jersey, 195 Little Albany Street, New Brunswick, NJ 08903, USA.
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Dai Y, Yan M, Wan J, Xiao T. Maf1 mitigates sevoflurane-induced microglial inflammatory damage and attenuates microglia-mediated neurotoxicity in HT-22 cells by activating the AMPK/Nrf2 signaling. Neurotoxicology 2022; 90:237-245. [PMID: 35430185 DOI: 10.1016/j.neuro.2022.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 02/26/2022] [Accepted: 04/11/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Maf1 has been found to play protective function against neuroinflammation and neuroapoptosis. This study seeks to explore whether and how Maf1 is involved in sevoflurane (Sev)-induced neuroinflammation and microglia-mediated neurotoxicity. METHODS qRT-PCR and western blot were used to detect the gene expression. ELISA was used to detect inflammatory factors. Cell viability was evaluated by using the Cell Counting Kit-8 kit. Neuroapoptosis was assessed with trhe Caspase-3 Assay Kit and the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick-end labeling (TUNEL) technique. RESULTS Maf1 expression was downregulated in Sev-stimulated BV2 microglial cells. Maf1 overexpression down-regulates the expression of pro-inflammatory M1-type markers (CD86, iNOS, IFN-γ) and up-regulates the expression of anti-inflammatory M2-type markers (CD206, TGF-β, Arg-1), and Maf1 reduces the Sev-induced inflammatory response in BV2 cells. After Maf1 overexpression, the relative expression of p-AMPK/AMPK and nucleus-Nrf2 increased significantly in BV2 cells treated with Sev. Inhibition of AMPK/Nrf2 pathway by compound C reverses anti-inflammatory effect of Maf1 in Sev-stimulated BV2 cells. Compound C reverses the effect of Maf1 on microglia-mediated neurotoxicity in HT-22 hippocampal neuronal cells. CONCLUSIONS Maf1 mitigates Sev-induced microglial inflammatory damage and attenuates microglia-mediated neurotoxicity by activating the AMPK/Nrf2 signaling.
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Affiliation(s)
- Yunyi Dai
- Department of Neurology, The First People's Hospital of Shangqiu, China
| | - Mingguang Yan
- Department of Laboratory Medicine, The First People's Hospital of Shangqiu, China
| | - Juan Wan
- Department of Neurology, The First Affiliated Hospital, Hengyang Medical School, University of South China, China
| | - Tao Xiao
- Department of Neurosurgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, China.
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Gupta S, Bazargani N, Drew J, Howden JH, Modi S, Al Awabdh S, Marie H, Attwell D, Kittler JT. The non-adrenergic imidazoline-1 receptor protein nischarin is a key regulator of astrocyte glutamate uptake. iScience 2022; 25:104127. [PMID: 35434559 PMCID: PMC9010640 DOI: 10.1016/j.isci.2022.104127] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 12/24/2021] [Accepted: 03/17/2022] [Indexed: 12/02/2022] Open
Abstract
Astrocytic GLT-1 is the main glutamate transporter involved in glutamate buffering in the brain, pivotal for glutamate removal at excitatory synapses to terminate neurotransmission and for preventing excitotoxicity. We show here that the surface expression and function of GLT-1 can be rapidly modulated through the interaction of its N-terminus with the nonadrenergic imidazoline-1 receptor protein, Nischarin. The phox domain of Nischarin is critical for interaction and internalization of surface GLT-1. Using live super-resolution imaging, we found that glutamate accelerated Nischarin-GLT-1 internalization into endosomal structures. The surface GLT-1 level increased in Nischarin knockout astrocytes, and this correlated with a significant increase in transporter uptake current. In addition, Nischarin knockout in astrocytes is neuroprotective against glutamate excitotoxicity. These data provide new molecular insights into regulation of GLT-1 surface level and function and suggest new drug targets for the treatment of neurological disorders. Nischarin phox domain interacts with the N-terminus of the glutamate transporter, GLT-1 Nischarin promotes internalization of GLT-1 to endosomes Glutamate modulates GLT-1 surface levels by regulating the Nischarin-GLT-1 interaction Nischarin loss enhances GLT-1 surface levels, transport currents, and neuroprotection
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Affiliation(s)
- Swati Gupta
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Narges Bazargani
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - James Drew
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Jack H. Howden
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Souvik Modi
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Sana Al Awabdh
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Hélène Marie
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - David Attwell
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
| | - Josef T. Kittler
- Department of Neuroscience, Physiology and Pharmacology, University College London, Gower Street, WC1E 6BT London, UK
- Corresponding author
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5
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Chen D, Sun YY, Zhou LY, Yang S, Hong FY, Liu XD, Sun ZL, Huang J, Feng DF. Maf1 regulates axonal regeneration of retinal ganglion cells after injury. Exp Neurol 2021; 348:113948. [PMID: 34902358 DOI: 10.1016/j.expneurol.2021.113948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 11/25/2021] [Accepted: 12/07/2021] [Indexed: 11/25/2022]
Abstract
Retinal ganglion cells (RGCs) are the sole output neurons that carry visual information from the eye to the brain. Due to various retinal and optic nerve diseases, RGC somas and axons are vulnerable to damage and lose their regenerative capacity. A basic question is whether the manipulation of a key regulator of RGC survival can protect RGCs from retinal and optic nerve diseases. Here, we found that Maf1, a general transcriptional regulator, was upregulated in RGCs from embryonic stage to adulthood. We determined that the knockdown of Maf1 promoted the survival of RGCs and their axon regeneration through altering the activity of the PTEN/mTOR pathway, which could be blocked by rapamycin. We further observed that the inhibition of Maf1 prevented the retinal ganglion cell complex from thinning after optic nerve crush. These findings reveal a neuroprotective effect of knocking down Maf1 on RGC survival after injury and provide a potential therapeutic strategy for traumatic optic neuropathy.
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Affiliation(s)
- Di Chen
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, China
| | - Yi-Yu Sun
- Southern Medical University Affiliated Fengxian Hospital, Shanghai 201499, China
| | - Lai-Yang Zhou
- Southern Medical University Affiliated Fengxian Hospital, Shanghai 201499, China
| | - Shuo Yang
- Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Fei-Yang Hong
- Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xian-Dong Liu
- Shanghai Ruijin hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200020, China
| | - Zhao-Liang Sun
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, China
| | - Ju Huang
- Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Dong-Fu Feng
- Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201999, China; Southern Medical University Affiliated Fengxian Hospital, Shanghai 201499, China.
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Sahin GS, Luis Rodriguez-Llamas J, Dillon C, Medina I, Appleyard SM, Gaiarsa JL, Wayman GA. Leptin increases GABAergic synaptogenesis through the Rho guanine exchange factor β-PIX in developing hippocampal neurons. Sci Signal 2021; 14:14/683/eabe4111. [PMID: 34006608 DOI: 10.1126/scisignal.abe4111] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Developing hippocampal neurons undergo rapid synaptogenesis in response to neurotrophic signals to form and refine circuit connections. The adipokine leptin is a satiety factor with neurotrophic actions, which potentiates both glutamatergic and GABAergic synaptogenesis in the hippocampus during neonatal development. Brief exposure to leptin enhances GABAA receptor-dependent synaptic currents in hippocampal neurons. Here, using molecular and electrophysiological techniques, we found that leptin increased the surface localization of GABAA receptors and the number of functional GABAergic synapses in hippocampal cultures from male and female rat pups. Leptin increased the interaction between GABAA receptors and the Rho guanine exchange factor β-PIX (a scaffolding protein at GABAergic postsynaptic sites) in a manner dependent on the kinase CaMKK. We also found that the leptin receptor and β-PIX formed a complex, the amount of which transiently increased upon leptin receptor activation. Furthermore, Tyr985 in the leptin receptor and the SH3 domain of β-PIX are crucial for this interaction, which was required for the developmental increase in GABAergic synaptogenesis. Our results suggest a mechanism by which leptin promotes GABAergic synaptogenesis in hippocampal neurons and reveal further complexity in leptin receptor signaling and its interactome.
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Affiliation(s)
- Gulcan Semra Sahin
- Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164 USA
| | - Jose Luis Rodriguez-Llamas
- Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164 USA
| | - Crystal Dillon
- Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164 USA
| | - Igor Medina
- Aix-Marseille University UMR 1249, INSERM (Institut National de la Santé et de la Recherche Médicale) Unité 1249, INMED (Institut de Neurobiologie de la Méditerranée), Marseille, France
| | - Suzanne M Appleyard
- Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164 USA
| | - Jean-Luc Gaiarsa
- Aix-Marseille University UMR 1249, INSERM (Institut National de la Santé et de la Recherche Médicale) Unité 1249, INMED (Institut de Neurobiologie de la Méditerranée), Marseille, France
| | - Gary A Wayman
- Department of Integrated Physiology and Neuroscience, Washington State University, Pullman, WA 99164 USA.
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Wang M, Liu X, Wu Y, Wang Y, Cui J, Sun J, Bai Y, Lang MF. ΜicroRNA-122 protects against ischemic stroke by targeting Maf1. Exp Ther Med 2021; 21:616. [PMID: 33936273 DOI: 10.3892/etm.2021.10048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Accepted: 09/11/2020] [Indexed: 11/06/2022] Open
Abstract
The protection of brain tissue against damage and the reduction of infarct size is crucial for improving patient prognosis following ischemic stroke. Therefore, the present study aimed to investigate the regulatory effect of microRNA (miR)-122 and its target gene repressor of RNA polymerase III transcription MAF1 homolog (Maf1) on the infarct area in ischemic stroke. Reverse transcription-quantitative PCR (RT-qPCR) was performed to determine miR-122 expression levels in an ischemic stroke [middle cerebral artery occlusion (MCAO)] mouse model. Nissl staining was conducted to measure the infarct area of the MCAO mouse model. Moreover, RT-qPCR was performed to investigate the relationship between the expression of Maf1 and miR-122 in the MCAO mouse model. Dual-luciferase reporter assay in vitro and miR-122 mimic or inhibitor treatment in vivo were conducted to verify that miR-122 targeted and inhibited Maf1 expression. The results suggested that miR-122 was upregulated in the brain tissue of MCAO model mice. miR-122 overexpression effectively reduced the size of the infarct area in comparison with a control and miR-122 knockdown in brain tissue resulted in the opposite effect. Moreover, Maf1 was confirmed to be a direct target of miR-122. The results of a dual-luciferase reporter assay indicated that miR-122 bound to the 3'-untranslated region of Maf1. Maf1 expression decreased after stroke model induction in comparison with that in sham animals, and Maf1 expression was negatively associated with the expression of miR-122. In addition, miR-122 knockdown increased Maf1 expression levels, whereas miR-122 overexpression decreased Maf1 expression levels in comparison with a control. In conclusion, the results suggested that miR-122 improved the outcome of acute ischemic stroke by reducing the expression of Maf1.
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Affiliation(s)
- Mengmeng Wang
- Department of Neurology, Affiliated Xinhua Hospital of Dalian University, Dalian, Liaoning 116021, P.R. China
| | - Xiaoman Liu
- Department of Neurology, Affiliated Xinhua Hospital of Dalian University, Dalian, Liaoning 116021, P.R. China
| | - Yu Wu
- Medical College, Institute of Microanalysis, Dalian University, Dalian, Liaoning 116622, P.R. China
| | - Yi Wang
- Department of Neurology, Affiliated Xinhua Hospital of Dalian University, Dalian, Liaoning 116021, P.R. China
| | - Jiahui Cui
- Department of Neurology, Affiliated Xinhua Hospital of Dalian University, Dalian, Liaoning 116021, P.R. China
| | - Jing Sun
- College of Environmental and Chemical Engineering, Institute of Microanalysis, Dalian University, Dalian, Liaoning 116622, P.R. China
| | - Ying Bai
- Department of Neurology, Affiliated Xinhua Hospital of Dalian University, Dalian, Liaoning 116021, P.R. China
| | - Ming-Fei Lang
- Medical College, Institute of Microanalysis, Dalian University, Dalian, Liaoning 116622, P.R. China
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8
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Chen S, Tang C, Ding H, Wang Z, Liu X, Chai Y, Jiang W, Han Y, Zeng H. Maf1 Ameliorates Sepsis-Associated Encephalopathy by Suppressing the NF- kB/NLRP3 Inflammasome Signaling Pathway. Front Immunol 2020; 11:594071. [PMID: 33424842 PMCID: PMC7785707 DOI: 10.3389/fimmu.2020.594071] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 11/17/2020] [Indexed: 12/13/2022] Open
Abstract
Background The NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3) inflammasome has been identified as an important mediator of blood–brain-barrier disruption in sepsis-associated encephalopathy (SAE). However, no information is available concerning the critical upstream regulators of SAE. Methods Lipopolysaccharide (LPS) was used to establish an in vitro model of blood–brain barrier (BBB) disruption and an in vivo model of SAE. Disruption of BBB integrity was assessed by measuring the expression levels of tight-junction proteins. NLRP3 inflammasome activation, pro-inflammatory cytokines levels, and neuroapoptosis were measured using biochemical assays. Finally, the FITC-dextran Transwell assay and Evan’s blue dye assay were used to assess the effect of Maf1 on LPS-induced endothelial permeability in vitro and in vivo. Results We found that Maf1 significantly suppressed the brain inflammatory response and neuroapoptosis induced by LPS in vivo and in vitro. Notably, Maf1 downregulated activation of the NF-κB/p65-induced NLRP3 inflammasome and the expression of pro-inflammatory cytokines. In addition, we found that Maf1 and p65 directly bound to the NLRP3 gene promoter region and competitively regulated the function of NLRP3 in inflammations. Moreover, overexpression of NLRP3 reversed the effects of p65 on BBB integrity, apoptosis, and inflammation in response to LPS. Our study revealed novel role for Maf1 in regulating NF-κB-mediated inflammasome formation, which plays a prominent role in SAE. Conclusions Regulation of Maf1 might be a therapeutic strategy for SAE and other neurodegenerative diseases associated with inflammation.
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Affiliation(s)
- Shenglong Chen
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Chaogang Tang
- Department of Cerebrovascular Disease, The Fifth Affiliated Hospital of Sun Yat-Sen University, Zhuhai, China
| | - Hongguang Ding
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Zhonghua Wang
- Department of Gerontological Critical Care Medicine, Guangdong Provincial People's Hospital/Guangdong Academy of Medical Sciences/Guangdong Provincial Geriatrics Institute, Guangzhou, China
| | - Xinqiang Liu
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Yunfei Chai
- Anesthesiology Department of Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Wenqiang Jiang
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Yongli Han
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Hongke Zeng
- Department of Critical Care Medicine, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
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9
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Maf1 regulates dendritic morphogenesis and influences learning and memory. Cell Death Dis 2020; 11:606. [PMID: 32732865 PMCID: PMC7393169 DOI: 10.1038/s41419-020-02809-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 07/12/2020] [Accepted: 07/14/2020] [Indexed: 12/24/2022]
Abstract
Maf1, a general transcriptional regulator and mTOR downstream effector, is highly expressed in the hippocampus and cortex, but the function of Maf1 in neurons is not well elucidated. Here, we first demonstrate that Maf1 plays a central role in the inhibition of dendritic morphogenesis and the growth of dendritic spines both in vitro and in vivo. Furthermore, Maf1 downregulation paradoxically leads to activation of AKT-mTOR signaling, which is mediated by decreased PTEN expression. Moreover, we confirmed that Maf1 could regulate the activity of PTEN promoter by luciferase reporter assay, and proved that Maf1 could bind to the promoter of PTEN by ChIP-PCR experiment. We also demonstrate that expression of Maf1 in the hippocampus affects learning and memory in mice. Taken together, we show for the first time that Maf1 inhibits dendritic morphogenesis and the growth of dendritic spines through AKT-mTOR signaling by increasing PTEN expression.
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10
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Mele M, Costa RO, Duarte CB. Alterations in GABA A-Receptor Trafficking and Synaptic Dysfunction in Brain Disorders. Front Cell Neurosci 2019; 13:77. [PMID: 30899215 PMCID: PMC6416223 DOI: 10.3389/fncel.2019.00077] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/15/2019] [Indexed: 12/12/2022] Open
Abstract
GABAA receptors (GABAAR) are the major players in fast inhibitory neurotransmission in the central nervous system (CNS). Regulation of GABAAR trafficking and the control of their surface expression play important roles in the modulation of the strength of synaptic inhibition. Different pieces of evidence show that alterations in the surface distribution of GABAAR and dysregulation of their turnover impair the activity of inhibitory synapses. A diminished efficacy of inhibitory neurotransmission affects the excitatory/inhibitory balance and is a common feature of various disorders of the CNS characterized by an increased excitability of neuronal networks. The synaptic pool of GABAAR is mainly controlled through regulation of internalization, recycling and lateral diffusion of the receptors. Under physiological condition these mechanisms are finely coordinated to define the strength of GABAergic synapses. In this review article, we focus on the alteration in GABAAR trafficking with an impact on the function of inhibitory synapses in various disorders of the CNS. In particular we discuss how similar molecular mechanisms affecting the synaptic distribution of GABAAR and consequently the excitatory/inhibitory balance may be associated with a wide diversity of pathologies of the CNS, from psychiatric disorders to acute alterations leading to neuronal death. A better understanding of the cellular and molecular mechanisms that contribute to the impairment of GABAergic neurotransmission in these disorders, in particular the alterations in GABAAR trafficking and surface distribution, may lead to the identification of new pharmacological targets and to the development of novel therapeutic strategies.
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Affiliation(s)
- Miranda Mele
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.,Institute for Interdisciplinary Research, University of Coimbra, Coimbra, Portugal
| | - Rui O Costa
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.,Institute for Interdisciplinary Research, University of Coimbra, Coimbra, Portugal
| | - Carlos B Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal.,Department of Life Sciences, University of Coimbra, Coimbra, Portugal
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11
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Lorenz-Guertin JM, Jacob TC. GABA type a receptor trafficking and the architecture of synaptic inhibition. Dev Neurobiol 2018; 78:238-270. [PMID: 28901728 PMCID: PMC6589839 DOI: 10.1002/dneu.22536] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 09/08/2017] [Accepted: 09/08/2017] [Indexed: 12/21/2022]
Abstract
Ubiquitous expression of GABA type A receptors (GABAA R) in the central nervous system establishes their central role in coordinating most aspects of neural function and development. Dysregulation of GABAergic neurotransmission manifests in a number of human health disorders and conditions that in certain cases can be alleviated by drugs targeting these receptors. Precise changes in the quantity or activity of GABAA Rs localized at the cell surface and at GABAergic postsynaptic sites directly impact the strength of inhibition. The molecular mechanisms constituting receptor trafficking to and from these compartments therefore dictate the efficacy of GABAA R function. Here we review the current understanding of how GABAA Rs traffic through biogenesis, plasma membrane transport, and degradation. Emphasis is placed on discussing novel GABAergic synaptic proteins, receptor and scaffolding post-translational modifications, activity-dependent changes in GABAA R confinement, and neuropeptide and neurosteroid mediated changes. We further highlight modern techniques currently advancing the knowledge of GABAA R trafficking and clinically relevant neurodevelopmental diseases connected to GABAergic dysfunction. © 2017 Wiley Periodicals, Inc. Develop Neurobiol 78: 238-270, 2018.
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Affiliation(s)
- Joshua M Lorenz-Guertin
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15261
| | - Tija C Jacob
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, 15261
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McKerrow WH, Savva YA, Rezaei A, Reenan RA, Lawrence CE. Predicting RNA hyper-editing with a novel tool when unambiguous alignment is impossible. BMC Genomics 2017; 18:522. [PMID: 28693467 PMCID: PMC5502491 DOI: 10.1186/s12864-017-3898-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 06/22/2017] [Indexed: 12/13/2022] Open
Abstract
Background Repetitive elements are now known to have relevant cellular functions, including self-complementary sequences that form double stranded (ds) RNA. There are numerous pathways that determine the fate of endogenous dsRNA, and misregulation of endogenous dsRNA is a driver of autoimmune disease, particularly in the brain. Unfortunately, the alignment of high-throughput, short-read sequences to repeat elements poses a dilemma: Such sequences may align equally well to multiple genomic locations. In order to differentiate repeat elements, current alignment methods depend on sequence variation in the reference genome. Reads are discarded when no such variations are present. However, RNA hyper-editing, a possible fate for dsRNA, introduces enough variation to distinguish between repeats that are otherwise identical. Results To take advantage of this variation, we developed a new algorithm, RepProfile, that simultaneously aligns reads and predicts novel variations. RepProfile accurately aligns hyper-edited reads that other methods discard. In particular we predict hyper-editing of Drosophila melanogaster repeat elements in vivo at levels previously described only in vitro, and provide validation by Sanger sequencing sixty-two individual cloned sequences. We find that hyper-editing is concentrated in genes involved in cell-cell communication at the synapse, including some that are associated with neurodegeneration. We also find that hyper-editing tends to occur in short runs. Conclusions Previous studies of RNA hyper-editing discarded ambiguously aligned reads, ignoring hyper-editing in long, perfect dsRNA – the perfect substrate for hyper-editing. We provide a method that simulation and Sanger validation show accurately predicts such RNA editing, yielding a superior picture of hyper-editing. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3898-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Wilson H McKerrow
- Division of Applied Mathematics, Brown University, Providence, 02912, RI, USA.
| | - Yiannis A Savva
- Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, 02912, RI, USA
| | - Ali Rezaei
- Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, 02912, RI, USA
| | - Robert A Reenan
- Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, 02912, RI, USA
| | - Charles E Lawrence
- Division of Applied Mathematics, Brown University, Providence, 02912, RI, USA
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Stabilization of GABA(A) receptors at endocytic zones is mediated by an AP2 binding motif within the GABA(A) receptor β3 subunit. J Neurosci 2012; 32:2485-98. [PMID: 22396422 DOI: 10.1523/jneurosci.1622-11.2011] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The strength of synaptic inhibition can be controlled by the stability and endocytosis of surface and synaptic GABA(A) receptors (GABA(A)Rs), but the surface receptor dynamics that underpin GABA(A)R recruitment to dendritic endocytic zones (EZs) have not been investigated. Stabilization of GABA(A)Rs at EZs is likely to be regulated by receptor interactions with the clathrin-adaptor AP2, but the molecular determinants of these associations remain poorly understood. Moreover, although surface GABA(A)R downmodulation plays a key role in pathological disinhibition in conditions such as ischemia and epilepsy, whether this occurs in an AP2-dependent manner also remains unclear. Here we report the characterization of a novel motif containing three arginine residues (405RRR407) within the GABA(A)R β3-subunit intracellular domain (ICD), responsible for the interaction with AP2 and GABA(A)R internalization. When this motif is disrupted, binding to AP2 is abolished in vitro and in rat brain. Using single-particle tracking, we reveal that surface β3-subunit-containing GABA(A)Rs exhibit highly confined behavior at EZs, which is dependent on AP2 interactions via this motif. Reduced stabilization of mutant GABA(A)Rs at EZs correlates with their reduced endocytosis and increased steady-state levels at synapses. By imaging wild-type or mutant super-ecliptic pHluorin-tagged GABA(A)Rs in neurons, we also show that, under conditions of oxygen-glucose deprivation to mimic cerebral ischemia, GABA(A)Rs are depleted from synapses in dendrites, depending on the 405RRR407 motif. Thus, AP2 binding to an RRR motif in the GABA(A)R β3-subunit ICD regulates GABA(A)R residency time at EZs, steady-state synaptic receptor levels, and pathological loss of GABA(A)Rs from synapses during simulated ischemia.
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Luscher B, Fuchs T, Kilpatrick CL. GABAA receptor trafficking-mediated plasticity of inhibitory synapses. Neuron 2011; 70:385-409. [PMID: 21555068 DOI: 10.1016/j.neuron.2011.03.024] [Citation(s) in RCA: 316] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/30/2011] [Indexed: 12/22/2022]
Abstract
Proper developmental, neural cell-type-specific, and activity-dependent regulation of GABAergic transmission is essential for virtually all aspects of CNS function. The number of GABA(A) receptors in the postsynaptic membrane directly controls the efficacy of GABAergic synaptic transmission. Thus, regulated trafficking of GABA(A) receptors is essential for understanding brain function in both health and disease. Here we summarize recent progress in the understanding of mechanisms that allow dynamic adaptation of cell surface expression and postsynaptic accumulation and function of GABA(A) receptors. This includes activity-dependent and cell-type-specific changes in subunit gene expression, assembly of subunits into receptors, as well as exocytosis, endocytic recycling, diffusion dynamics, and degradation of GABA(A) receptors. In particular, we focus on the roles of receptor-interacting proteins, scaffold proteins, synaptic adhesion proteins, and enzymes that regulate the trafficking and function of receptors and associated proteins. In addition, we review neuropeptide signaling pathways that affect neural excitability through changes in GABA(A)R trafficking.
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Affiliation(s)
- Bernhard Luscher
- Department of Biology, Pennsylvania State University, University Park, PA 16802, USA.
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